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Yeates KO, Räisänen AM, Premji Z, Debert CT, Frémont P, Hinds S, Smirl JD, Barlow K, Davis GA, Echemendia RJ, Feddermann-Demont N, Fuller C, Gagnon I, Giza CC, Iverson GL, Makdissi M, Schneider KJ. What tests and measures accurately diagnose persisting post-concussive symptoms in children, adolescents and adults following sport-related concussion? A systematic review. Br J Sports Med 2023; 57:780-788. [PMID: 37316186 DOI: 10.1136/bjsports-2022-106657] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/03/2023] [Indexed: 06/16/2023]
Abstract
OBJECTIVE To determine what tests and measures accurately diagnose persisting post-concussive symptoms (PPCS) in children, adolescents and adults following sport-related concussion (SRC). DESIGN A systematic literature review. DATA SOURCES MEDLINE, Embase, PsycINFO, Cochrane Central Register of Controlled Trials, CINAHL and SPORTDiscus through March 2022. ELIGIBILITY CRITERIA Original, empirical, peer-reviewed findings (cohort studies, case-control studies, cross-sectional studies and case series) published in English and focused on SRC. Studies needed to compare individuals with PPCS to a comparison group or their own baseline prior to concussion, on tests or measures potentially affected by concussion or associated with PPCS. RESULTS Of 3298 records screened, 26 articles were included in the qualitative synthesis, including 1016 participants with concussion and 531 in comparison groups; 7 studies involved adults, 8 involved children and adolescents and 11 spanned both age groups. No studies focused on diagnostic accuracy. Studies were heterogeneous in participant characteristics, definitions of concussion and PPCS, timing of assessment and the tests and measures examined. Some studies found differences between individuals with PPCS and comparison groups or their own pre-injury assessments, but definitive conclusions were not possible because most studies had small convenience samples, cross-sectional designs and were rated high risk of bias. CONCLUSION The diagnosis of PPCS continues to rely on symptom report, preferably using standardised symptom rating scales. The existing research does not indicate that any other specific tool or measure has satisfactory accuracy for clinical diagnosis. Future research drawing on prospective, longitudinal cohort studies could help inform clinical practice.
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Affiliation(s)
- Keith Owen Yeates
- Department of Psychology, University of Calgary, Calgary, Alberta, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | - Anu M Räisänen
- Department of Physical Therapy Education - Oregon, Western University of Health Sciences, College of Health Sciences - Northwest, Lebanon, Oregon, USA
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Zahra Premji
- Libraries, University of Victoria, Victoria, British Columbia, Canada
| | - Chantel T Debert
- Department of Clinical Neuroscience, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Pierre Frémont
- Department of Rehabilitation, Laval University, Quebec, Quebec, Canada
| | - Sidney Hinds
- Uniformed Services University, Bethesda, Maryland, USA
| | - Jonathan D Smirl
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
- Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Karen Barlow
- Child Health Research Centre, Faculty of Medicine, University of Queensland, Brisbane, Queensland, Australia
| | - Gavin A Davis
- Murdoch Children's Research Institute, Parkville, Victoria, Australia
- Cabrini Health, Malvern, Victoria, Australia
| | - Ruben J Echemendia
- Department of Psychology, University of Missouri, Kansas City, Missouri, USA
- Psychological and Neurobehavioral Associates, Inc, State College, Pennsylvania, USA
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland
- Sports Neuroscience, University of Zurich, Zurich, Switzerland
| | - Colm Fuller
- College of Medicine and Health, University College Cork, Cork, Ireland
- Sports Medicine Department, Sports Surgery Clinic, Dublin, Ireland
| | - Isabelle Gagnon
- School of Physical and Occupational Therapy, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
- Trauma Center, Montreal Children's Hospital, McGill University Health Center, Montreal, Quebec, Canada
| | - Christopher C Giza
- Department of Neurosurgery, UCLA Steve Tisch BrainSPORT Program, Los Angeles, California, USA
- Department of Pediatrics/Pediatric Neurology, Mattel Children's Hospital UCLA, Los Angeles, California, USA
| | - Grant L Iverson
- Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA
- Sports Concussion Program, MassGeneral Hospital for Children, Boston, Massachusetts, USA
| | - Michael Makdissi
- Melbourne Brain Centre, Florey Institute of Neuroscience and Mental Health - Austin Campus, Heidelberg, Victoria, Australia
- Australian Football League, Melbourne, Victoria, Australia
| | - Kathryn J Schneider
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
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Patricios JS, Schneider KJ, Dvorak J, Ahmed OH, Blauwet C, Cantu RC, Davis GA, Echemendia RJ, Makdissi M, McNamee M, Broglio S, Emery CA, Feddermann-Demont N, Fuller GW, Giza CC, Guskiewicz KM, Hainline B, Iverson GL, Kutcher JS, Leddy JJ, Maddocks D, Manley G, McCrea M, Purcell LK, Putukian M, Sato H, Tuominen MP, Turner M, Yeates KO, Herring SA, Meeuwisse W. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport-Amsterdam, October 2022. Br J Sports Med 2023; 57:695-711. [PMID: 37316210 DOI: 10.1136/bjsports-2023-106898] [Citation(s) in RCA: 113] [Impact Index Per Article: 113.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/02/2023] [Indexed: 06/16/2023]
Abstract
For over two decades, the Concussion in Sport Group has held meetings and developed five international statements on concussion in sport. This 6th statement summarises the processes and outcomes of the 6th International Conference on Concussion in Sport held in Amsterdam on 27-30 October 2022 and should be read in conjunction with the (1) methodology paper that outlines the consensus process in detail and (2) 10 systematic reviews that informed the conference outcomes. Over 3½ years, author groups conducted systematic reviews of predetermined priority topics relevant to concussion in sport. The format of the conference, expert panel meetings and workshops to revise or develop new clinical assessment tools, as described in the methodology paper, evolved from previous consensus meetings with several new components. Apart from this consensus statement, the conference process yielded revised tools including the Concussion Recognition Tool-6 (CRT6) and Sport Concussion Assessment Tool-6 (SCAT6, Child SCAT6), as well as a new tool, the Sport Concussion Office Assessment Tool-6 (SCOAT6, Child SCOAT6). This consensus process also integrated new features including a focus on the para athlete, the athlete's perspective, concussion-specific medical ethics and matters related to both athlete retirement and the potential long-term effects of SRC, including neurodegenerative disease. This statement summarises evidence-informed principles of concussion prevention, assessment and management, and emphasises those areas requiring more research.
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Affiliation(s)
- Jon S Patricios
- Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Kathryn J Schneider
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Jiri Dvorak
- Spine Unit, Schulthess Clinic Human Performance Lab, Zurich, Switzerland
| | - Osman Hassan Ahmed
- Physiotherapy Department, University Hospitals Dorset NHS Foundation Trust, Poole, UK
- The FA Centre for Para Football Research, The Football Association, Burton-Upon-Trent, Staffordshire, UK
| | - Cheri Blauwet
- Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation/Harvard Medical School, Boston, Massachusetts, USA
- Kelley Adaptive Sports Research Institute, Spaulding Rehabilitation, Boston, Massachusetts, USA
| | - Robert C Cantu
- CTE Center, Boston University School of Medicine, Boston, Massachusetts, USA
- Neurology, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Gavin A Davis
- Murdoch Children's Research Institute, Parkville, Victoria, Australia
- Cabrini Health, Malvern, Victoria, Australia
| | - Ruben J Echemendia
- Psychology, University of Missouri Kansas City, Kansas City, Missouri, USA
- Psychological and Neurobehavioral Associates, Inc, Miami, Florida, USA
| | - Michael Makdissi
- Florey Institute of Neuroscience and Mental Health-Austin Campus, Heidelberg, Victoria, Australia
- La Trobe Sport and Exercise Medicine Research Centre, Melbourne, Victoria, Australia
| | - Michael McNamee
- Department of Movement Sciences, KU Leuven, Leuven, Belgium
- School of Sport and Exercise Medicine, Swansea University, Swansea, UK
| | - Steven Broglio
- Michigan Concussion Center, University of Michigan, Ann Arbor, Michigan, USA
| | - Carolyn A Emery
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Nina Feddermann-Demont
- University Hospital Zurich, Zurich, Switzerland
- Sports Neuroscience, University of Zurich, Zurich, Switzerland
| | - Gordon Ward Fuller
- School of Health and Related Research, University of Sheffield, Sheffield, South Yorkshire, UK
| | - Christopher C Giza
- Neurosurgery, UCLA Steve Tisch BrainSPORT Program, Los Angeles, California, USA
- Pediatrics/Pediatric Neurology, Mattel Children's Hospital UCLA, Los Angeles, California, USA
| | - Kevin M Guskiewicz
- Matthew Gfeller Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Brian Hainline
- National Collegiate Athletic Association (NCAA), Indianapolis, Indiana, USA
| | - Grant L Iverson
- Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA
- Sports Concussion Program, MassGeneral Hospital for Children, Boston, Massachusetts, USA
| | | | - John J Leddy
- UBMD Orthopaedics and Sports Medicne, SUNY Buffalo, Buffalo, New York, USA
| | - David Maddocks
- Melbourne Neuropsychology Services & Perry Maddocks Trollope Lawyers, Melbourne, Victoria, Australia
| | - Geoff Manley
- Neurosurgery, University of California, San Francisco, San Francisco, California, USA
| | - Michael McCrea
- Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Laura K Purcell
- Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
| | | | - Haruhiko Sato
- Neurosurgery, Seirei Mikatahara Hospital, Hamamatsu, Japan
| | | | - Michael Turner
- International Concussion and Head Injury Research Foundation, London, UK
- University College London, London, UK
| | | | - Stanley A Herring
- Department of Rehabilitation Medicine, Orthopaedics and Sports Medicine, University of Washington, Seattle, Washington, USA
- Department of Neurological Surgery, University of Washington, Seattle, Washington, USA
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Schneider KJ, Critchley ML, Anderson V, Davis GA, Debert CT, Feddermann-Demont N, Gagnon I, Guskiewicz KM, Hayden KA, Herring S, Johnstone C, Makdissi M, Master CL, Moser RS, Patricios JS, Register-Mihalik JK, Ronksley PE, Silverberg ND, Yeates KO. Targeted interventions and their effect on recovery in children, adolescents and adults who have sustained a sport-related concussion: a systematic review. Br J Sports Med 2023; 57:771-779. [PMID: 37316188 DOI: 10.1136/bjsports-2022-106685] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/04/2023] [Indexed: 06/16/2023]
Abstract
OBJECTIVES We evaluated interventions to facilitate recovery in children, adolescents and adults with a sport-related concussion (SRC). DESIGN Systematic review including risk of bias (modified Scottish Intercollegiate Guidelines Network tool). DATA SOURCES MEDLINE(R) and Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Embase, APA PsycINFO, Cochrane Central Register of Controlled Trials, CINAHL Plus with Full Text, SPORTDiscus and Scopus searched until March 2022. STUDY ELIGIBILITY CRITERIA (1) Original research including randomised controlled trials (RCTs), quasi-experimental designs, cohort, comparative effectiveness studies; (2) focus on SRC; (3) English; (4) peer-reviewed and (5) evaluated treatment. RESULTS 6533 studies were screened, 154 full texts reviewed and 13 met inclusion (10 RCTs, 1 quasi-experimental and 2 cohort studies; 1 high-quality study, 7 acceptable and 5 at high risk of bias). Interventions, comparisons, timing and outcomes varied, precluding meta-analysis. For adolescents and adults with dizziness, neck pain and/or headaches >10 days following concussion, individualised cervicovestibular rehabilitation may decrease time to return to sport compared with rest followed by gradual exertion (HR 3.91 (95% CI 1.34 to 11.34)) and when compared with a subtherapeutic intervention (HR 2.91 (95% CI 1.01 to 8.43)). For adolescents with vestibular symptoms/impairments, vestibular rehabilitation may decrease time to medical clearance (vestibular rehab group 50.2 days (95% CI 39.9 to 60.4) compared with control 58.4 (95% CI 41.7 to 75.3) days). For adolescents with persisting symptoms >30 days, active rehabilitation and collaborative care may decrease symptoms. CONCLUSIONS Cervicovestibular rehabilitation is recommended for adolescents and adults with dizziness, neck pain and/or headaches for >10 days. Vestibular rehabilitation (for adolescents with dizziness/vestibular impairments >5 days) and active rehabilitation and/or collaborative care (for adolescents with persisting symptoms >30 days) may be of benefit.
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Affiliation(s)
- Kathryn J Schneider
- Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
| | | | - Vicki Anderson
- Child Neuropsychology, Murdoch Childrens Research Institute, Parkville, Victoria, Australia
- Psychology, University of Melbourne, Parkville, Victoria, Australia
| | - Gavin A Davis
- Murdoch Children's Research Institute, Parkville, Victoria, Australia
- Cabrini Health, Malvern, Victoria, Australia
| | - Chantel T Debert
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, Zurich Switzerland Sports Neuroscience, University of Zurich, Zurich, Switzerland
| | - Isabelle Gagnon
- School of Physical and Occupational Therapy, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Kevin M Guskiewicz
- Sports Medicine Research Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - K Alix Hayden
- Libraries and Cultural Resources, University of Calgary, Calgary, Alberta, Canada
| | - Stanley Herring
- Departments of Rehabilitation Medicine, Orthopaedics and Sports Medicine and Neurological Surgery, University of Washington, Seattle, Washington, USA
| | | | - Michael Makdissi
- Florey Institute of Neuroscience and Mental Health - Austin Campus, Heidelberg, Victoria, Australia
- Australian Football League, Melbourne, Victoria, Australia
| | - Christina L Master
- Pediatrics and Sports Medicine, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
| | | | - Jon S Patricios
- Wits Sport and Health (WiSH), School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Johna K Register-Mihalik
- Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Paul E Ronksley
- Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Noah D Silverberg
- Department of Psychology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Keith Owen Yeates
- Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Alberta, Canada
- Psychology, University of Calgary, Calgary, Alberta, Canada
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4
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Haase FK, Prien A, Douw L, Feddermann-Demont N, Junge A, Reinsberger C. Cortical thickness and neurocognitive performance in former high-level female soccer and non-contact sport athletes. Scand J Med Sci Sports 2023; 33:921-930. [PMID: 36746873 DOI: 10.1111/sms.14324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 01/03/2023] [Accepted: 01/31/2023] [Indexed: 02/08/2023]
Abstract
BACKGROUND Long-term effects of playing soccer (football) on the brain structure and function of the brain are vividly debated. While some studies showed differences in neurocognitive performance and structural brain changes in retired male players, data on female players are scarce. The present study compares cortical thickness and neurocognitive performance in former high-level female soccer (SOC) and non-contact sport athletes (CON). METHODS 3 T T1-weighted 3D MPRAGE MRI was performed, and vertex-wise cortical thickness was analyzed using FreeSurfer (v. 6.0.0). Neurocognitive performance in seven domains of SOC and CON was assessed. A multivariate linear model was used to analyze interactions with respect to heading frequency and a history of concussion. RESULTS SOC (n = 15, mean age 38.3 ± 5.1 years) and CON (n = 16, mean age 36.6 ± 5.8 years) had a similar cortical thickness and performed similarly in the neurocognitive tests except for verbal memory and psychomotor speed, where SOC performed significantly worse than CON. Moderate headers had a significantly larger cortical thickness than rare headers in the right inferior parietal region. Visual memory and cortical thickness were positively correlated in the group of frequent headers and negatively correlated in CON, but not in the other header groups. PERSPECTIVE In contrast to previous reports in male soccer players, female players did not reveal cortical thinning in comparison with control athletes, whereas neurocognitive profiles of female soccer players might not significantly differ from male athletes. Small sample sizes, subjective header assessment, and the case-control study design require a cautious interpretation.
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Affiliation(s)
| | - Annika Prien
- Institute of Interdisciplinary Exercise Science and Sports Medicine, MSH Medical School Hamburg, Hamburg, Germany.,Amsterdam Collaboration on Health & Safety in Sports, Department of Public and Occupational Health, Amsterdam Movement Sciences, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Linda Douw
- Department of Anatomy and Neurosciences, Amsterdam University Medical Centers, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Astrid Junge
- Institute of Interdisciplinary Exercise Science and Sports Medicine, MSH Medical School Hamburg, Hamburg, Germany
| | - Claus Reinsberger
- Institute of Sports Medicine, Paderborn University, Paderborn, Germany
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Tarnutzer AA, Weber KP, Bockisch CJ, Straumann D, Feddermann-Demont N. Vestibular performance in high-level soccer and ice hockey players: Sport-specific norm values and implications. J Sci Med Sport 2021; 25:81-88. [PMID: 34509343 DOI: 10.1016/j.jsams.2021.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 07/01/2021] [Accepted: 08/09/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Quantitative vestibular testing in athletes after sports-related concussion (SRC) has become more popular due to accompanying injuries of the peripheral-vestibular organs that require targeted treatment. Sports-specific normative values are currently not available. Taking into account potential adaptational mechanisms, we obtained sports-specific, age- and peak-head-velocity-corrected normative values of peripheral-vestibular function and postural-stability in football (soccer, FB) and ice-hockey (IH) players. DESIGN Retrospective single-center case-control study. METHOD Pre-seasonal angular vestibulo-ocular reflex (aVOR) gains and cumulative-saccadic-amplitudes were obtained using the video-head-impulse test and performance in the balance-error-scoring-system (BESS) was recorded and compared in high-level FB-players (n = 510, 197 females) and IH-players (n = 210, males only) (age-range = 13-39y) and in healthy normals (n = 49, 22 females). Statistical analysis was performed using a generalized linear model. RESULTS aVOR-gain values were significantly higher for FB-players than for IH-players (1.07 ± 0.21 vs. 0.98 ± 0.13, p < 0.001) and controls (1.07 ± 0.21 vs. 0.97 ± 0.17, p < 0.001). Significant age-related changes in aVOR-gains were only observed for the anterior and posterior canals in the IH-players. Cumulative-saccadic-amplitudes were clearly below established cut-off values (0.73°/trial). BESS scores were significantly higher in IH-players than in FB-players (15.4 ± 5.1 vs. 11.2 ± 4.9, p < 0.001). CONCLUSIONS The significantly better performance of the FB players in the vertical aVOR-gains and the BESS compared to the IH-players could be related to sports-specific differences influencing visuo-vestibular and balance performance. Therefore, we recommend using the established normative aVOR-gain values for high-level FB-players, whereas in IH obtaining individual pre-seasonal (baseline) aVOR-gain values is proposed. Further studies should add sports-specific normative aVOR-gain values for IH and other sports.
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Affiliation(s)
- Alexander Andrea Tarnutzer
- Schulthess Klinik, Swiss Concussion Center, Switzerland; University of Zurich, Faculty of Medicine, Switzerland; Cantonal Hospital of Baden, Neurology, Switzerland.
| | - Konrad Peter Weber
- Schulthess Klinik, Swiss Concussion Center, Switzerland; University of Zurich, Faculty of Medicine, Switzerland; University Hospital Zurich, Clinical Neuroscience Center, Switzerland; University Hospital Zurich, Department of Neurology, Switzerland; University Hospital Zurich, Department of Ophthalmology, Switzerland
| | - Christopher J Bockisch
- Schulthess Klinik, Swiss Concussion Center, Switzerland; University of Zurich, Faculty of Medicine, Switzerland; University Hospital Zurich, Clinical Neuroscience Center, Switzerland; University Hospital Zurich, Department of Neurology, Switzerland; University Hospital Zurich, Department of Ophthalmology, Switzerland; University Hospital Zurich, Department of Otorhinolaryngology, Switzerland
| | - Dominik Straumann
- Schulthess Klinik, Swiss Concussion Center, Switzerland; University of Zurich, Faculty of Medicine, Switzerland; University Hospital Zurich, Clinical Neuroscience Center, Switzerland; University Hospital Zurich, Department of Neurology, Switzerland
| | - Nina Feddermann-Demont
- Schulthess Klinik, Swiss Concussion Center, Switzerland; University Hospital Zurich, Clinical Neuroscience Center, Switzerland; University Hospital Zurich, Department of Neurology, Switzerland
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Gygli J, Romano F, Bockisch CJ, Feddermann-Demont N, Straumann D, Bertolini G. Effect of the Stimulus Duration on the Adaptation of the Optokinetic Afternystagmus. Front Neurol 2021; 12:518133. [PMID: 33868138 PMCID: PMC8044906 DOI: 10.3389/fneur.2021.518133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/04/2021] [Indexed: 11/13/2022] Open
Abstract
Observing a rotating visual pattern covering a large portion of the visual field induces optokinetic nystagmus (OKN). If the lights are suddenly switched off, optokinetic afternystagmus (OKAN) occurs. OKAN is hypothesized to originate in the velocity storage mechanism (VSM), a central processing network involved in multi-sensory integration. During a sustained visual rotation, the VSM builds up a velocity signal. After the lights are turned off, the VSM discharges slowly, with OKAN as the neurophysiological correlate. It has been reported that the initial afternystagmus in the direction of the preceding stimulus (OKAN-I) can be followed by a reversed one (OKAN-II), which increases with stimulus duration up to 15 min. In 11 healthy adults, we investigated OKAN following optokinetic stimulus lasting 30 s, 3-, 5-, and 10-min. Analysis of slow-phase cumulative eye position and velocity found OKAN-II in only 5/11 participants. Those participants presented it in over 70% of their trials with longer durations, but only in 10% of their 30 s trials. While this confirms that OKAN-II manifests predominantly after sustained stimuli, it suggests that its occurrence is subject-specific. We also did not observe further increases with stimulus duration. Conversely, OKAN-II onset occurred later as stimulus duration increased (p = 0.02), while OKAN-II occurrence and peak velocity did not differ between the three longest stimuli. Previous studies on OKAN-I, used negative saturation models to account for OKAN-II. As these approaches have no foundation in the OKAN-II literature, we evaluated if a simplified version of a rigorous model of OKAN adaptation could be used in humans. Slow-phase velocity following the trials with 3-, 5-, and 10-min stimuli was fitted with a sum of two decreasing exponential functions with opposite signs (one for OKAN-I and one for OKAN-II). The model assumes separate mechanisms for OKAN-I, representing VSM discharge, and OKAN-II, described as a slower adaptation phenomenon. Although the fit was qualitatively imperfect, this is not surprising given the limited reliability of OKAN in humans. The estimated adaptation time constant seems comparable to the one describing the reversal of the vestibulo-ocular reflex during sustained rotation, suggesting a possible shared adaptive mechanism.
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Affiliation(s)
- Jan Gygli
- Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | - Fausto Romano
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Christopher J Bockisch
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Departments of Ophthalmology and Otorhinolaryngology, University Hospital Zurich, Zurich, Switzerland
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Dominik Straumann
- Faculty of Medicine, University of Zurich, Zurich, Switzerland.,Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Giovanni Bertolini
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
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7
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Prien A, Feddermann-Demont N, Verhagen E, Twisk J, Junge A. Neurocognitive performance and mental health of retired female football players compared to non-contact sport athletes. BMJ Open Sport Exerc Med 2020; 6:e000952. [PMID: 33312682 PMCID: PMC7716672 DOI: 10.1136/bmjsem-2020-000952] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/15/2020] [Indexed: 11/25/2022] Open
Abstract
Background Adverse long-term effects of playing football due to repetitive head impact exposure on neurocognition and mental health are controversial. To date, no studies have evaluated such effects in women. Aims To (1) compare neurocognitive performance, cognitive symptoms and mental health in retired elite female football players (FB) with retired elite female non-contact sport athletes (CON), and to (2) assess whether findings are related to history of concussion and/or heading exposure in FB. Methods Neurocognitive performance, mental health and cognitive symptoms were assessed using computerised tests (CNS-vital signs), paper pen tests (Category fluency, Trail-Making Test, Digit Span, Paced Auditory Serial Addition Test), questionnaires (Hospital Anxiety and Depression Scale, SF-36v2 Health Survey) and a symptom checklist. Heading exposure and concussion history were self-reported in an online survey and in a clinical interview, respectively. Linear regression was used to analyse the effect of football, concussion and heading exposure on outcomes adjusted for confounders. Results FB (n=66) performed similar to CON (n=45) on neurocognitive tests, except for significantly lower scores on verbal memory (mean difference (MD)=−7.038, 95% CI −12.98 to –0.08, p=0.038) and verbal fluency tests (MD=−7.534, 95% CI –13.75 to –0.46, p=0.016). Among FB weaker verbal fluency performance was significantly associated with ≥2 concussions (MD=−10.36, 95% CI –18.48 to –2.83, p=0.017), and weaker verbal memory performance with frequent heading (MD=−9.166, 95% CI –17.59 to –0.123, p=0.041). The depression score differed significantly between study populations, and was significantly associated with frequent heading but not with history of concussion in FB. Conclusion Further studies should investigate the clinical relevance of our findings and whether the observed associations point to a causal link between repetitive head impacts and verbal memory/fluency or mental health.
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Affiliation(s)
- Annika Prien
- Fakultät Humanwissenschaften, MSH Medical School Hamburg, Hamburg, Germany.,Amsterdam Collaboration on Health & Safety in Sports, Public and Occupational Health, Amsterdam UMC Locatie VUmc, Amsterdam, The Netherlands
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Swiss Concussion Center (SCC), Schulthess Klinik, Zurich, Switzerland
| | - Evert Verhagen
- Amsterdam Collaboration on Health & Safety in Sports, Public and Occupational Health, Amsterdam UMC Locatie VUmc, Amsterdam, The Netherlands.,Department of Human Biology, Division of Exercise Science and Sports Medicine, University of Cape Town, Rondebosch, Western Cape, South Africa
| | - Jos Twisk
- Epidemiology and Biostatistics, Amsterdam UMC Locatie VUmc, Amsterdam, The Netherlands
| | - Astrid Junge
- Fakultät Humanwissenschaften, MSH Medical School Hamburg, Hamburg, Germany.,Swiss Concussion Center (SCC), Schulthess Klinik, Zurich, Switzerland
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8
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Feddermann-Demont N, Chiampas G, Cowie CM, Meyer T, Nordström A, Putukian M, Straumann D, Kramer E. Recommendations for initial examination, differential diagnosis, and management of concussion and other head injuries in high-level football. Scand J Med Sci Sports 2020; 30:1846-1858. [PMID: 32557913 PMCID: PMC9290574 DOI: 10.1111/sms.13750] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 05/09/2020] [Accepted: 06/04/2020] [Indexed: 12/22/2022]
Abstract
Head injuries can result in substantially different outcomes, ranging from no detectable effect to transient functional impairments to life‐threatening structural lesions. In high‐level international football (soccer) tournaments, on average, one head injury occurs in every third match. Making the diagnosis and determining the severity of a head injury immediately on‐pitch or off‐field is a major challenge for team physicians, especially because clinical signs of a brain injury can develop over several minutes, hours, or even days after the injury. A standardized approach is useful to support team physicians in their decision whether the player should be allowed to continue to play or should be removed from play after head injury. A systematic, football‐specific procedure for examination and management during the first 72 hours after head injuries and a graduated Return‐to‐Football program for high‐level players have been developed by an international group of experts based on current national and international guidelines for the management of acute head injuries. The procedure includes seven stages from the initial on‐pitch examination to the graduated Return‐to‐Football program. Details of the assessments and the consequences of different outcomes are described for each stage. Criteria for emergency management (red flags), removal from play (orange flags), and referral to specialists for further diagnosis and treatment (persistent orange flags) are provided. The guidelines for return to sport after concussion‐type head injury are specified for football. Thus, the present paper presents a comprehensive procedure for team physicians after a head injury in high‐level football.
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Affiliation(s)
- Nina Feddermann-Demont
- University Hospital and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Georges Chiampas
- US Soccer Federation, Chicago, IL, USA.,Departments of Emergency and Orthopedics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | | | - Tim Meyer
- Institute of Sports and Preventive Medicine, Saarland University, Saarbruecken, Germany
| | - Anna Nordström
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.,School of Sport Sciences, UiT The Arctic University of Norway, Tromsø, Norway
| | - Margot Putukian
- University Health Services, Princeton University, Princeton, NJ, USA.,Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, USA
| | - Dominik Straumann
- University Hospital and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Efraim Kramer
- Division of Sports Medicine, University of Pretoria, Pretoria, South Africa
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9
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Mucci V, Meier C, Bizzini M, Romano F, Agostino D, Ventura A, Bertolini G, Feddermann-Demont N. Combined Optokinetic Treatment and Vestibular Rehabilitation to Reduce Visually Induced Dizziness in a Professional Ice Hockey Player After Concussion: A Clinical Case. Front Neurol 2019; 10:1200. [PMID: 31849804 PMCID: PMC6896248 DOI: 10.3389/fneur.2019.01200] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/28/2019] [Indexed: 11/13/2022] Open
Abstract
Background: The appropriate detection and therapy of concussion symptoms are of great importance to avoid long-term impairment and absence from pre-concussive activities, such as sport, school or work. Post-traumatic headache and dizziness are known as risk factors of persistent symptoms after a concussion. Dizziness has even been classified as a predictor for symptom persistence. One type of dizziness, which has never been considered is visually induced dizziness (VID) often develops as a consequence of vestibular impairment. This manuscript presents the clinical case of a 25-year-old male, professional ice hockey player, whereby a therapeutic approach to VID after concussion is demonstrated. Case: A detailed interdisciplinary clinical and laboratory-assisted neurological, neurovestibular and ocular-motor examination was performed 20 days post-concussion, which indicated VID symptoms. Thus, the player qualified for a 5-day combined vestibular, balance and optokinetic therapy, which aimed to reduce the player's increased sensitivity to visual information. Each treatment day consisted of two sessions: vestibular/ocular-motor training and exposure to optokinetic stimuli combined with postural control exercises. The optokinetic stimulus was delivered in the form of a rotating disk. VID symptoms were recorded daily via posturography and a visual analog scale prior to the optokinetic sessions. The player improved over the course of each treatment day and was able to return to ice hockey 15 days after the final treatment session. Three months later the player reported no symptoms in the follow up questionnaire. Conclusion: The combination of vestibular, balance and optokinetic therapy led to remission of VID symptoms in a professional ice hockey player after multiple concussions, within a short time frame after his last concussion. Thus, this case study highlights the significant benefit of treating post-concussive VID symptoms utilizing a multi-modal approach.
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Affiliation(s)
- Viviana Mucci
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Cornelia Meier
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Mario Bizzini
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Human Performance Lab, Schulthess Clinic, Zurich, Switzerland
| | - Fausto Romano
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Daniel Agostino
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | | | - Giovanni Bertolini
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Nina Feddermann-Demont
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, University Hospital and University of Zurich, Zurich, Switzerland
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10
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Prien A, Junge A, Brugger P, Straumann D, Feddermann-Demont N. Neurocognitive Performance of 425 Top-Level Football Players: Sport-specific Norm Values and Implications. Arch Clin Neuropsychol 2019; 34:575-584. [PMID: 30165564 DOI: 10.1093/arclin/acy056] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/07/2018] [Accepted: 07/04/2018] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE Concussion diagnosis and management in sports largely relies on neurocognitive testing. In the absence of baseline assessment, only norm values of the general population are available for comparison with scores of concussed athletes. To evaluate whether (elite) sport specific norm values are needed, cognitive performance was compared between top-level football players and the general population. METHODS Cognitive performance of 425 top-level football players was evaluated using the computerized test battery CNS Vital Signs. Players were split into two age groups (15-19 and 20-29 years) and test results were compared with a norm sample (n = 268) by means of age-standardized scores using Cohen's d effect size statistics. RESULTS The younger age group outperformed the norm sample in all domains, with small to moderate effects on tests of processing speed (d = 0.58, 95% CI = 0.31,0.85), cognitive flexibility (d = 0.27, 95% CI = 0.01,0.53) and psychomotor speed (d = 0.97, 95% CI = 0.69,1.24). In the older age group, no differences were found on four out of six domains; a moderate positive effect was found for psychomotor speed (d = 0.74, 95% CI = 0.54,0.93), a small negative effect for reaction time (d = -0.47, 95% CI = -0.66,-0.28). Relative to the norm, older football players scored lower than younger football players on all test domains. CONCLUSION Cognitive performance of elite football players may be different from the general population. It is recommended to use football-specific norm scores for comparison with test results of concussed players, and to choose an adequate control group when investigating effects of contact sport on cognition. Studies with older/retired football players are needed to further analyze potential sport-specific age effects.
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Affiliation(s)
- Annika Prien
- Department of Prevention, Health Promotion and Sports Medicine, MSH Medical School Hamburg, Hamburg, Germany
- Amsterdam Collaboration on Health and Safety in Sports, Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands
| | - Astrid Junge
- Department of Prevention, Health Promotion and Sports Medicine, MSH Medical School Hamburg, Hamburg, Germany
- Schulthess Clinic, Zurich, Switzerland
- Swiss Concussion Centre (SCC), Zurich, Switzerland
| | - Peter Brugger
- Swiss Concussion Centre (SCC), Zurich, Switzerland
- Department of Neurology, University Hospital Zurich, University of Zurich, Switzerland
- Clinical Neuroscience Center, University Hospital Zurich, University of Zurich, Switzerland
- Zurich Center for Integrative Human Physiology, ZIHP, University of Zurich, Switzerland
| | - Dominik Straumann
- Swiss Concussion Centre (SCC), Zurich, Switzerland
- Department of Neurology, University Hospital Zurich, University of Zurich, Switzerland
- Clinical Neuroscience Center, University Hospital Zurich, University of Zurich, Switzerland
| | - Nina Feddermann-Demont
- Schulthess Clinic, Zurich, Switzerland
- Swiss Concussion Centre (SCC), Zurich, Switzerland
- Department of Neurology, University Hospital Zurich, University of Zurich, Switzerland
- Clinical Neuroscience Center, University Hospital Zurich, University of Zurich, Switzerland
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11
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Romano F, Bertolini G, Agostino D, Straumann D, Ramat S, Feddermann-Demont N. Functional Head Impulse Test in Professional Athletes: Sport-Specific Normative Values and Implication for Sport-Related Concussion. Front Neurol 2019; 10:387. [PMID: 31130909 PMCID: PMC6509415 DOI: 10.3389/fneur.2019.00387] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 03/29/2019] [Indexed: 02/05/2023] Open
Abstract
Dizziness, slow visual tracking, or blurred vision following active head (or body) movements are among the most common symptoms reported following sport-related concussion, often related to concurrent dysfunctions of the vestibular system. In some cases, symptoms persist even if bedside and auxiliary standard vestibular tests are unremarkable. New functional tests have been developed in recent years to objectify neurological alterations that are not captured by standard tests. The functional head impulse test (fHIT) requires the patient to recognize an optotype that is briefly flashed during head rotations with various angular accelerations (2,001–6,000 deg/s2) and assesses the proportion if correct answers (pca). 268 active professional athletes (23.70 ± 5.32y) from six different sports were tested using fHIT. Pca were analyzed both pooling head acceleration in the range of 2,001–6,000 deg/s2 and computing a single pca value for each 1,000 deg/s2 bin in the range 2,001–8,000 deg/s2. No significant difference (p = 0.159) was found between responses to head impulses in the plane of horizontal (pca: 0.977) and vertical semicircular canals (pca: 0.97). The sport practiced had a major effect on the outcome of the fHIT. Handball players achieved a better performance (p < 0.001) than the whole athlete group, irrespective of the direction of head impulses. The pca achieved by athletes practicing snowboard, bob and skeleton were instead significantly below those of the whole athlete group (p < 0.001) but only when vertical head impulses were tested. Overall, pca declined with increasing head acceleration. The decline was particularly evident in the range not included in the standard fHIT exam, i.e., 6,001–8,000 deg/s2 for horizontal and 5,001–8,000 deg/s2 for vertical head impulses. When vertical head impulses were tested, athletes practicing snowboard, bob and skeleton (non-ball sports) showed, beside the lower overall pca, also a steeper decline as a function of vertical head acceleration. The findings suggest that: (1) functional VOR testing can help understanding sport-specific VOR requirements; (2) the fHIT is able to detect and objectify subtle, sport-specific changes of functional VOR performance; (3) if sport-specific normative values are used, the fHIT test procedure needs to be optimized, starting from the highest acceleration to minimize the number of head impulses.
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Affiliation(s)
- Fausto Romano
- Department of Neurology, University of Zurich, Zurich, Switzerland.,Clinical Neuroscience Center, University Hospital of Zürich, Zurich, Switzerland.,Swiss Concussion Center, Zurich, Switzerland
| | - Giovanni Bertolini
- Department of Neurology, University of Zurich, Zurich, Switzerland.,Clinical Neuroscience Center, University Hospital of Zürich, Zurich, Switzerland.,Swiss Concussion Center, Zurich, Switzerland
| | | | - Dominik Straumann
- Department of Neurology, University of Zurich, Zurich, Switzerland.,Clinical Neuroscience Center, University Hospital of Zürich, Zurich, Switzerland.,Swiss Concussion Center, Zurich, Switzerland
| | - Stefano Ramat
- Department of Computer, Electric and Biomedical Engineering, University of Pavia, Pavia, Italy
| | - Nina Feddermann-Demont
- Department of Neurology, University of Zurich, Zurich, Switzerland.,Clinical Neuroscience Center, University Hospital of Zürich, Zurich, Switzerland.,Swiss Concussion Center, Zurich, Switzerland
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12
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Visscher RMS, Feddermann-Demont N, Romano F, Straumann D, Bertolini G. Artificial intelligence for understanding concussion: Retrospective cluster analysis on the balance and vestibular diagnostic data of concussion patients. PLoS One 2019; 14:e0214525. [PMID: 30939164 PMCID: PMC6445465 DOI: 10.1371/journal.pone.0214525] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 03/14/2019] [Indexed: 12/26/2022] Open
Abstract
OBJECTIVES We propose a bottom-up, machine-learning approach, for the objective vestibular and balance diagnostic data of concussion patients, to provide insight into the differences in patients' phenotypes, independent of existing diagnoses (unsupervised learning). METHODS Diagnostic data from a battery of validated balance and vestibular assessments were extracted from the database of the Swiss Concussion Center. The desired number of clusters within the patient database was estimated using Calinski-Harabasz criteria. Complex (self-organizing map, SOM) and standard (k-means) clustering tools were used, and the formed clusters were compared. RESULTS A total of 96 patients (81.3% male, age (median [IQR]): 25.0[10.8]) who were expected to suffer from sports-related concussion or post-concussive syndrome (52[140] days between diagnostic testing and the concussive episode) were included. The cluster evaluation indicated dividing the data into two groups. Only the SOM gave a stable clustering outcome, dividing the patients in group-1 (n = 38) and group-2 (n = 58). A large significant difference was found for the caloric summary score for the maximal speed of the slow phase, where group-1 scored 30.7% lower than group-2 (27.6[18.2] vs. 51.0[31.0]). Group-1 also scored significantly lower on the sensory organisation test composite score (69.0[22.3] vs. 79.0[10.5]) and higher on the visual acuity (-0.03[0.33] vs. -0.14[0.12]) and dynamic visual acuity (0.38[0.84] vs. 0.20[0.20]) tests. The importance of caloric, SOT and DVA, was supported by the PCA outcomes. Group-1 tended to report headaches, blurred vision and balance problems more frequently than group-2 (>10% difference). CONCLUSION The SOM divided the data into one group with prominent vestibular disorders and another with no clear vestibular or balance problems, suggesting that artificial intelligence might help improve the diagnostic process.
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Affiliation(s)
- Rosa M. S. Visscher
- Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
- Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Nina Feddermann-Demont
- Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Fausto Romano
- Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Dominik Straumann
- Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Giovanni Bertolini
- Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zurich, University of Zurich, Zurich, Switzerland
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
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13
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Bertolini G, Romano F, Feddermann-Demont N, Straumann D, Tarnutzer AA, Ramat S. Non-linearity in gaze holding: Experimental results and possible mechanisms. Progress in Brain Research 2019; 248:167-181. [DOI: 10.1016/bs.pbr.2019.04.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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Broglio SP, Kontos AP, Levin H, Schneider K, Wilde EA, Cantu RC, Feddermann-Demont N, Fuller GW, Gagnon I, Gioia GA, Giza C, Griesbach GS, Leddy JJ, Lipton ML, Mayer AR, McAllister TW, McCrea M, McKenzie LB, Putukian M, Signoretti S, Suskauer SJ, Tamburro R, Turner M, Yeates KO, Zemek R, Ala'i S, Esterlitz J, Gay K, Bellgowan PSF, Joseph K. National Institute of Neurological Disorders and Stroke and Department of Defense Sport-Related Concussion Common Data Elements Version 1.0 Recommendations. J Neurotrauma 2018; 35:2776-2783. [PMID: 29717643 DOI: 10.1089/neu.2018.5643] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Through a partnership with the National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health, and Department of Defense, the development of Sport-Related Concussion (SRC) Common Data Elements (CDEs) was initiated. The aim of this collaboration was to increase the efficiency and effectiveness of clinical research studies and clinical treatment outcomes, increase data quality, facilitate data sharing across studies, reduce study start-up time, more effectively aggregate information into metadata results, and educate new clinical investigators. The SRC CDE Working Group consisted of 32 worldwide experts in concussion from varied fields of related expertise divided into three Subgroups: Acute (<72 h post-concussion), Subacute (3 days-3 months post-concussion) and Persistent/Chronic (>3 months post-concussion). To develop CDEs, the Subgroups reviewed various domains, then selected from, refined, and added to existing CDEs, case report forms and field-tested data elements from national registries and funded research studies. Recommendations were posted to the NINDS CDE Website for Public Review from February 2017 to April 2017. Following an internal Working Group review of recommendations, along with consideration of comments received from the Public Review period, the first iteration (Version 1.0) of the NINDS SRC CDEs was completed in June 2017. The recommendations include Core and Supplemental-Highly Recommended CDEs for cognitive data elements and symptom checklists, as well as other outcomes and end-points (e.g., vestibular, oculomotor, balance, anxiety, depression), and sample case report forms (e.g., injury reporting, demographics, concussion history) for domains typically included in clinical research studies. The NINDS SRC CDEs and supporting documents are publicly available on the NINDS CDE website www.commondataelements.ninds.nih.gov . Widespread use of CDEs by researchers and clinicians will facilitate consistent SRC clinical research and trial design, data sharing, and metadata retrospective analysis.
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Affiliation(s)
| | | | - Harvey Levin
- 3 Baylor College of Medicine and the Michael E. DeBakey VA Medical Center, Houston, Texas
| | | | - Elisabeth A Wilde
- 3 Baylor College of Medicine and the Michael E. DeBakey VA Medical Center, Houston, Texas.,5 University of Utah School of Medicine , Salt Lake City, Utah
| | - Robert C Cantu
- 6 Concussion Center at Emerson Hospital, Concord, Massachusetts
| | | | | | - Isabelle Gagnon
- 9 Montreal Children's Hospital, McGill University Health Center , Montréal, Québec, Canada
| | | | - Christopher Giza
- 11 UCLA Brain Injury Research Center, Steve Tisch BrainSPORT Program, University of California , Los Angeles, California
| | | | - John J Leddy
- 13 SUNY Jacobs School of Medicine and Biomedical Sciences, University at Buffalo , Buffalo, New York
| | - Michael L Lipton
- 14 Albert Einstein College of Medicine and Montefiore Medical Center , Bronx, New York
| | - Andrew R Mayer
- 15 The Mind Research Network, University of New Mexico , Albuquerque, New Mexico
| | | | | | - Lara B McKenzie
- 18 The Research Institute at Nationwide Children's Hospital , Columbus, Ohio
| | | | | | - Stacy J Suskauer
- 21 Kennedy Krieger Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Robert Tamburro
- 21 Kennedy Krieger Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland.,22 Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland
| | - Michael Turner
- 23 The International Concussion and Head Injury Research Foundation , London, United Kingdom
| | | | - Roger Zemek
- 24 Children's Hospital of Eastern Ontario Research Institute , Ottawa, Ontario, Canada
| | | | | | - Katelyn Gay
- 25 The Emmes Corporation, Rockville, Maryland
| | - Patrick S F Bellgowan
- 26 National Institute of Neurological Disorders and Stroke (NINDS) Bethesda, Maryland
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15
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McCrory P, Feddermann-Demont N, Dvořák J, Cassidy JD, McIntosh A, Vos PE, Echemendia RJ, Meeuwisse W, Tarnutzer AA. What is the definition of sports-related concussion: a systematic review. Br J Sports Med 2017; 51:877-887. [PMID: 29098981 DOI: 10.1136/bjsports-2016-097393] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2017] [Indexed: 11/04/2022]
Abstract
OBJECTIVES Various definitions for concussion have been proposed, each having its strengths and weaknesses. We reviewed and compared current definitions and identified criteria necessary for an operational definition of sports-related concussion (SRC) in preparation of the 5th Concussion Consensus Conference (Berlin, Germany). We also assessed the role of biomechanical studies in informing an operational definition of SRC. DESIGN This is a systematic literature review. DATA SOURCES Data sources include MEDLINE, Embase, Cumulative Index to Nursing and Allied Health Literature, Cochrane Central Register of Clinical Trials and SPORT Discus (accessed 14 September 2016). ELIGIBILITY CRITERIA FOR SELECTING STUDIES Eligibility criteria were studies reporting (clinical) criteria for diagnosing SRC and studies containing SRC impact data. RESULTS Out of 1601 articles screened, 36 studies were included (2.2%), 14 reported on criteria for SRC definitions and 22 on biomechanical aspects of concussions. Six different operational definitions focusing on clinical findings and their dynamics were identified. Biomechanical studies were obtained almost exclusively on American football players. Angular and linear head accelerations linked to clinically confirmed concussions demonstrated considerable individual variation. SUMMARY/CONCLUSIONS SRC is a traumatic brain injury that is defined as a complex pathophysiological process affecting the brain, induced by biomechanical forces with several common features that help define its nature. Limitations identified include that the current criteria for diagnosing SRC are clinically oriented and that there is no gold/standard to assess their diagnostic properties. A future, more valid definition of SRC would better identify concussed players by demonstrating high predictive positive/negative values. Currently, the use of helmet-based systems to study the biomechanics of SRC is limited to few collision sports. New approaches need to be developed to provide objective markers for SRC.
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Affiliation(s)
- Paul McCrory
- The Florey Institute of Neuroscience and Mental Health, Heidelberg, Victoria, Australia
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - Jiří Dvořák
- Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, Schulthess Clinic, Zurich, Switzerland
| | - J David Cassidy
- Division of Health Care and Outcomes Research, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Division of Epidemiology, Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.,Department of Sport Science and Clinical Biomechanics, Faculty of Health, University of Southern Denmark, Odense, Denmark
| | - Andrew McIntosh
- Australian Collaboration for Research into Injury in Sport and its Prevention (ACRISP), Federation University Australia, Ballarat, Victoria, Australia.,Monash University Accident Research Centre, Monash University, Melbourne, Australia
| | - Pieter E Vos
- Department of Neurology, Slingeland Ziekenhuis, Doetinchem, The Netherlands
| | - Ruben J Echemendia
- UOC Concussion Care Clinic, State College, Pennsylvania, USA.,Department of Psychology, University of Missouri - Kansas City, State College, Pennsylvania, USA
| | - Willem Meeuwisse
- Faculty of Kinesiology, Sport Injury Prevention Research Centre, University of Calgary, Calgary, Alberta, Canada
| | - Alexander A Tarnutzer
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
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16
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McCrory P, Meeuwisse WH, Dvořák J, Echemendia RJ, Engebretsen L, Feddermann-Demont N, McCrea M, Makdissi M, Patricios J, Schneider KJ, Sills AK. 5th International Conference on Concussion in Sport (Berlin). Br J Sports Med 2017; 51:837. [DOI: 10.1136/bjsports-2017-097878] [Citation(s) in RCA: 224] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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17
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Feddermann-Demont N, Echemendia RJ, Schneider KJ, Solomon GS, Hayden KA, Turner M, Dvořák J, Straumann D, Tarnutzer AA. What domains of clinical function should be assessed after sport-related concussion? A systematic review. Br J Sports Med 2017; 51:903-918. [DOI: 10.1136/bjsports-2016-097403] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2017] [Indexed: 11/04/2022]
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18
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Makdissi M, Schneider KJ, Feddermann-Demont N, Guskiewicz KM, Hinds S, Leddy JJ, McCrea M, Turner M, Johnston KM. Approach to investigation and treatment of persistent symptoms following sport-related concussion: a systematic review. Br J Sports Med 2017; 51:958-968. [DOI: 10.1136/bjsports-2016-097470] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2017] [Indexed: 11/03/2022]
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19
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McCrory P, Meeuwisse W, Dvorak J, Aubry M, Bailes J, Broglio S, Cantu RC, Cassidy D, Echemendia RJ, Castellani RJ, Davis GA, Ellenbogen R, Emery C, Engebretsen L, Feddermann-Demont N, Giza CC, Guskiewicz KM, Herring S, Iverson GL, Johnston KM, Kissick J, Kutcher J, Leddy JJ, Maddocks D, Makdissi M, Manley GT, McCrea M, Meehan WP, Nagahiro S, Patricios J, Putukian M, Schneider KJ, Sills A, Tator CH, Turner M, Vos PE. Consensus statement on concussion in sport—the 5thinternational conference on concussion in sport held in Berlin, October 2016. Br J Sports Med 2017; 51:838-847. [DOI: 10.1136/bjsports-2017-097699] [Citation(s) in RCA: 917] [Impact Index Per Article: 131.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2017] [Indexed: 11/03/2022]
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Feddermann-Demont N, Junge A, Weber KP, Weller M, Dvořák J, Tarnutzer AA. Prevalence of potential sports-associated risk factors in Swiss amyotrophic lateral sclerosis patients. Brain Behav 2017; 7:e00630. [PMID: 28413696 PMCID: PMC5390828 DOI: 10.1002/brb3.630] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 12/02/2016] [Accepted: 12/07/2016] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVES Amyotrophic lateral sclerosis (ALS) has been reported to occur with increased incidence amongst physically active people. The role of extrinsic risk factors as physical activity, head trauma and drug/pesticide-exposure in the pathophysiology of ALS and especially in the context of practising sports remains controversial. MATERIALS AND METHODS We retrospectively studied exposure to extrinsic factors in 92 ALS patients in the presymptomatic stage. Metabolic equivalents (METs) were calculated and the association of physical activity, drug intake, head trauma and participation in specific sports (football [soccer], ice hockey) with age at symptom-onset was evaluated. RESULTS Ninety-five percent of patients considered themselves physically active before symptom-onset. Total MET-values varied broadly and there was no correlation between vigorous physical activity and age at symptom-onset. Mild traumatic brain injury (prevalence = 16.7%) was the most frequent diagnosis after head/neck injury. A history of ≥1 head/neck injuries was associated with a younger age at symptom-onset (61.8 ± 11.0 vs. 54.1 ± 13.0, p = .013). In former football and ice hockey players the rate of vigorous physical activities was increased (p < .05), whereas total MET-values, frequency of head injuries and analgesic intake were not different compared to other ALS patients. CONCLUSIONS History of head injuries was the only extrinsic risk factor associated with accelerated neurodegeneration in ALS. There was no evidence for extrinsic factors predisposing former football and ice hockey players to ALS. Our data therefore support the hypothesis that not increased physical activity per se, but other unknown environmental factors and/or genetic profile or lifestyle-promoting physical fitness increases ALS susceptibility.
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Affiliation(s)
- Nina Feddermann-Demont
- Department of Neurology University Hospital Zurich and University of Zurich Zurich Switzerland.,Swiss Concussion Center Schulthess Clinic Zurich Switzerland.,FIFA Medical Assessment and Research Centre (F-MARC) Zurich Switzerland
| | - Astrid Junge
- Swiss Concussion Center Schulthess Clinic Zurich Switzerland.,FIFA Medical Assessment and Research Centre (F-MARC) Zurich Switzerland.,Schulthess Clinic Zurich Switzerland.,Medical School Hamburg (MSH) Hamburg Germany
| | - Konrad P Weber
- Department of Neurology University Hospital Zurich and University of Zurich Zurich Switzerland.,Swiss Concussion Center Schulthess Clinic Zurich Switzerland.,Department of Ophthalmology University Hospital Zurich and University of Zurich Zurich Switzerland
| | - Michael Weller
- Department of Neurology University Hospital Zurich and University of Zurich Zurich Switzerland
| | - Jiří Dvořák
- Swiss Concussion Center Schulthess Clinic Zurich Switzerland.,FIFA Medical Assessment and Research Centre (F-MARC) Zurich Switzerland.,Schulthess Clinic Zurich Switzerland.,Fédération Internationale de Football Association Zurich Switzerland
| | - Alexander A Tarnutzer
- Department of Neurology University Hospital Zurich and University of Zurich Zurich Switzerland.,Swiss Concussion Center Schulthess Clinic Zurich Switzerland
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Schneider KJ, Leddy JJ, Guskiewicz KM, Seifert T, McCrea M, Silverberg ND, Feddermann-Demont N, Iverson GL, Hayden A, Makdissi M. Rest and treatment/rehabilitation following sport-related concussion: a systematic review. Br J Sports Med 2017; 51:930-934. [PMID: 28341726 DOI: 10.1136/bjsports-2016-097475] [Citation(s) in RCA: 192] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/28/2017] [Indexed: 12/19/2022]
Abstract
AIM OR OBJECTIVE The objective of this systematic review was to evaluate the evidence regarding rest and active treatment/rehabilitation following sport-related concussion (SRC). DESIGN Systematic review. DATA SOURCES MEDLINE (OVID), CINAHL (EbscoHost), PsycInfo (OVID), Cochrane Central Register of Controlled Trials (OVID), SPORTDiscus (EbscoHost), EMBASE (OVID) and Proquest DissertationsandTheses Global (Proquest) were searched systematically. ELIGIBILITY CRITERIA FOR SELECTING STUDIES Studies were included if they met the following criteria: (1) original research; (2) reported SRC as the diagnosis; and (3) evaluated the effect of rest or active treatment/rehabilitation. Review articles were excluded. RESULTS Twenty-eight studies met the inclusion criteria (9 regarding the effects of rest and 19 evaluating active treatment). The methodological quality of the literature was limited; only five randomised controlled trials (RCTs) met the eligibility criteria. Those RCTs included rest, cervical and vestibular rehabilitation, subsymptom threshold aerobic exercise and multifaceted collaborative care. SUMMARY/CONCLUSIONS A brief period (24-48 hours) of cognitive and physical rest is appropriate for most patients. Following this, patients should be encouraged to gradually increase activity. The exact amount and duration of rest are not yet well defined and require further investigation. The data support interventions including cervical and vestibular rehabilitation and multifaceted collaborative care. Closely monitored subsymptom threshold, submaximal exercise may be of benefit. SYSTEMATIC REVIEW REGISTRATION PROSPERO 2016:CRD42016039570.
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Affiliation(s)
| | - John J Leddy
- Department of Orthopaedics, SUNY Buffalo, Buffalo, New York, USA
| | - Kevin M Guskiewicz
- Sports Medicine Research laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Tad Seifert
- Norton Healthcare, Louisville, Kentucky, USA
| | - Michael McCrea
- Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Noah D Silverberg
- Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Nina Feddermann-Demont
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland.,Schulthess Clinic, Zurich, Switzerland
| | - Grant L Iverson
- Physical Medicine and Rehabilitation, Harvard Medical School; and Red Sox Foundation and Massachusetts General Hospital Home Base Program, Boston, Massachusetts, USA
| | - Alix Hayden
- Libraries and Cultural Resources, University of Calgary, Calgary, Alberta, Canada
| | - Michael Makdissi
- Melbourne Brain Centre, Florey Institute of Neuroscience and Mental Health - Austin Campus, Heidelberg, Victoria, Australia.,Olympic Park Sports Medicine Centre, Melbourne, Australia
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22
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Faude O, Rössler R, Junge A, Aus der Fünten K, Chomiak J, Verhagen E, Beaudouin F, Dvorak J, Feddermann-Demont N. Head injuries in children's football-results from two prospective cohort studies in four European countries. Scand J Med Sci Sports 2017; 27:1986-1992. [PMID: 28054391 DOI: 10.1111/sms.12839] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2017] [Indexed: 11/27/2022]
Abstract
Head injuries are considered harmful in children. We analyzed head and neck injuries in organized football in 7- to 12-year-old children. Data for this analysis were obtained from a prospective cohort study over two consecutive football seasons in two European countries, and a randomized intervention trial over one season in four European countries. Football exposure and injuries were documented through an online database. Detailed information regarding injury characteristics and medical follow-up was retrieved from coaches, children and parents by phone. Thirty-nine head injuries and one neck injury (5% of all 791 injuries) were documented during 9933 player-seasons (total football exposure 688 045 hours). The incidence was 0.25 [95%CI 0.15, 0.35] head/neck injuries per 1000 match hours (N=23 match injuries) and 0.03 [95%CI 0.02, 0.03] per 1000 training hours. Eleven concussions (27.5%), nine head contusions (22.5%), eight lacerations or abrasions (20%), two nose fractures (2.5%), and two dental injuries (2.5%) occurred. The remaining eight injuries were nose bleeding or other minor injuries. Thirty injuries (75%) resulted from contact with another player, and ten injuries were due to collision with an object, falling or a hit by the ball. Whereas 70% of all head injuries (N=28) were due to frontal impacts, 73% of concussions (N=8) resulted from an impact to the occiput. The incidence and severity of head injuries in children's football are low. Coaches and parents, however, should be sensitized regarding the potential of concussions, particularly after an impact to the occiput.
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Affiliation(s)
- O Faude
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - R Rössler
- Department of Sport, Exercise and Health, University of Basel, Basel, Switzerland
| | - A Junge
- Medical School Hamburg, Hamburg, Germany.,Swiss Concussion Center (SCC) and Schulthess Clinic, Zurich, Switzerland
| | - K Aus der Fünten
- Institute of Sports and Preventive Medicine, Saarland University, FIFA-Medical Centre of Excellence, Saarbrücken, Germany
| | - J Chomiak
- Department of Orthopaedics, 1st Faculty of Medicine of Charles University and Hospital Na Bulovce, FIFA-Medical Centre of Excellence, Prague, Czech Republic
| | - E Verhagen
- Department of Public and Occupational Health, EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands
| | - F Beaudouin
- Institute of Sports and Preventive Medicine, Saarland University, FIFA-Medical Centre of Excellence, Saarbrücken, Germany
| | - J Dvorak
- Swiss Concussion Center (SCC) and Schulthess Clinic, Zurich, Switzerland
| | - N Feddermann-Demont
- Swiss Concussion Center (SCC) and Schulthess Clinic, Zurich, Switzerland.,Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital & University of Zurich, Zurich, Switzerland
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23
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Tarnutzer AA, Straumann D, Brugger P, Feddermann-Demont N. Persistent effects of playing football and associated (subconcussive) head trauma on brain structure and function: a systematic review of the literature. Br J Sports Med 2016; 51:1592-1604. [PMID: 27815240 DOI: 10.1136/bjsports-2016-096593] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2016] [Indexed: 11/04/2022]
Abstract
AIM/OBJECTIVE There is ongoing controversy about persistent neurological deficits in active and former football (soccer) players. We reviewed the literature for associations between football activities (including heading/head injuries) and decline in brain structure/function. DESIGN Systematic literature review. DATA SOURCES MEDLINE, Embase, PsycINFO, CINAHL, Cochrane-CRCT, SportDiscus, Cochrane-DSR=4 (accessed 2 August 2016). ELIGIBILITY CRITERIA FOR SELECTING STUDIES Original studies reporting on football-related persistent effects on brain structure/function. Results from neurocognitive testing, neuroimaging and EEG were compared with controls and/or correlated with heading frequency and/or head injuries. Methodological quality was rated for risk-of-bias, including appropriateness of controls, correction for multiple statistical testing and assessment of heading frequency and head injuries. RESULTS 30 studies with 1691 players were included. Those 57% (8/14) of case-control studies reporting persistent neurocognitive impairment had higher odds for inappropriate control of type 1 errors (OR=17.35 (95% CI (10.61 to 28.36)) and for inappropriate selection of controls (OR=1.72 (1.22 to 2.43)) than studies observing no impairment. Studies reporting a correlation between heading frequency and neurocognitive deficits (6/17) had lower quality of heading assessment (OR=14.20 (9.01 to 22.39)) than studies reporting no such correlation. In 7 of 13 studies (54%), the number of head injuries correlated with the degree of neurocognitive impairment. Abnormalities on neuroimaging (6/8 studies) were associated with subclinical neurocognitive deficits in 3 of 4 studies. SUMMARY/CONCLUSIONS Various methodological shortcomings limit the evidence for persistent effects of football play on brain structure/function. Sources of bias include low-quality assessment of heading frequency, inappropriate control for type 1 errors and inappropriate selection of controls. Combining neuroimaging techniques with neurocognitive testing in prospective studies seems most promising to further clarify on the impact of football on the brain.
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Affiliation(s)
- A A Tarnutzer
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - D Straumann
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
| | - P Brugger
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - N Feddermann-Demont
- Department of Neurology, University Hospital Zurich and University of Zurich, Zurich, Switzerland.,Swiss Concussion Center, Schulthess Clinic, Zurich, Switzerland
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Junge A, Feddermann-Demont N. Prevalence of depression and anxiety in top-level male and female football players. BMJ Open Sport Exerc Med 2016; 2:e000087. [PMID: 27900164 PMCID: PMC5117057 DOI: 10.1136/bmjsem-2015-000087] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Accepted: 11/17/2015] [Indexed: 11/10/2022] Open
Abstract
Background Scientific studies on the prevalence of mental health problems in elite athletes are rare, and most have had considerable methodological limitations, such as low response rate and heterogeneous samples. Aims To evaluate the prevalence of depression and anxiety in top-level football players in comparison to the general population, and to analyse potential risk factors. Methods Players of all first league (FL) and of four U-21 football teams in Switzerland were asked to answer a questionnaire on player's characteristics, the Centre of Epidemiologic Studies Depression Scale (CES-D) and the Generalized Anxiety Disorder (GAD-7) scale. Results All 10 women's FL teams, 9 of 10 men's FL teams and 4 male U-21 teams (n=471 football players) took part in the study. The CES-D score indicated a mild to moderate depression in 33 (7.6%) players and a major depression in 13 (3.0%) players. The GAD-7 score indicated an at least moderate anxiety disorder in 6 (1.4%) players. Compared to the general population, the prevalence of depression was similar and the prevalence of anxiety disorders was significantly (χ2=16.7; p<0.001) lower in football players. Significant differences were observed with regard to player characteristics, such as age, gender, player position, level of play and current injury. Conclusions Swiss FL football players had the same prevalence of depression as the general population, while male U-21 players had a higher prevalence of depression. It is important to raise awareness and knowledge of athletes’ mental health problems in coaches and team physicians, and to provide adequate treatment to athletes.
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Affiliation(s)
- Astrid Junge
- Medical School Hamburg (MSH), Hamburg, Germany; FIFA Medical Assessment and Research Centre (F-MARC), Zürich, Switzerland; Swiss Concussion Centre (SCC) Schulthess Klinik, Zürich, Switzerland
| | - Nina Feddermann-Demont
- FIFA Medical Assessment and Research Centre (F-MARC), Zürich, Switzerland; Swiss Concussion Centre (SCC) Schulthess Klinik, Zürich, Switzerland; Department of Neurology, Interdisciplinary Center for Vertigo and Neurological Visual Disorders, University Hospital Zürich, Zürich, Switzerland
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Edouard P, Feddermann-Demont N, Alonso JM, Branco P, Junge A. Sex differences in injury during top-level international athletics championships: surveillance data from 14 championships between 2007 and 2014. Br J Sports Med 2015; 49:472-7. [DOI: 10.1136/bjsports-2014-094316] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Abstract
A concussion is a rare but potentially serious injury of football players. Thus, an immediate and valid diagnosis, estimate of severity and therapeutic management is required. To summarise the published information on management of concussion with respect to a safe return to play (RTP), a literature search was conducted. Current guidelines on concussion in sports and significant studies on concussion in football were analysed. After concussion, management and RTP decision should remain in the area of clinical judgement on an individualised basis according to the current international guidelines. If a concussion is suspected, the player should not be allowed to RTP the same day. The RTP programme should follow a gradual step-wise procedure. A concussed player should not RTP unless he/she is asymptomatic and the neurological and neuropsychological examinations are normal. Untimely RTP bears an increased risk of sustaining another more severe brain injury and repetitive brain injury of long-term sequelae. In football, the management of concussion should primarily follow the recommendations proposed by the Concussion in Sports Group. Information and education of players and their medical and coaching team help to protect the players' health. Future studies on concussion should include validated and detailed information on RTP protocols.
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Feddermann-Demont N, Junge A, Edouard P, Branco P, Alonso JM. Injuries in 13 international Athletics championships between 2007–2012. Br J Sports Med 2014; 48:513-22. [DOI: 10.1136/bjsports-2013-093087] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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