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Sørensen LB, Holden S, Oei EHG, Magnusson SP, Olesen JL, Dean BJF, Hever M, Lyng K, Rathleff MS. A comprehensive MRI investigation to identify potential biomarkers of Osgood Schlatter disease in adolescents: A cross sectional study comparing Osgood Schlatter disease with controls. Scand J Med Sci Sports 2024; 34:e14634. [PMID: 38682790 DOI: 10.1111/sms.14634] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 03/15/2024] [Accepted: 03/28/2024] [Indexed: 05/01/2024]
Abstract
BACKGROUND Osgood-Schlatter disease (OSD) is the most common knee pain complaint among adolescents playing sports. Despite this, there remains controversy over the pathophysiology and whether specific anatomical characteristics are associated with OSD. PURPOSE This study aimed to systematically and comprehensively characterize adolescents with OSD using magnetic resonance imaging (MRI) compared to pain-free controls, including both tissue abnormalities that may be associated with OSD, as well as anatomical characteristics. A secondary objective was to identify potential imaging biomarkers associated with pain. STUDY DESIGN Cross-sectional study. METHODS Adolescents with OSD and controls were recruited from 2020 to 2022. Following a clinical exam, demographics, pain, sports participation, and Tanner stage were collected. Knee MRI was conducted on the participants' most symptomatic knee (OSD) or the dominant leg (controls). RESULTS Sixty-seven adolescents (46 with OSD and 30 controls) were included. 80% of participants with OSD had at least one tissue alteration compared to 54% of controls. Compared to controls, OSD had 36.3 (95%CI 4.5 to 289.7) higher odds of bony oedema at the tibial tuberosity, and 32.7 (95%CI 4.1 to 260.6) and 5.3 (95%CI 0.6 to 46.2) higher odds of bony oedema at the tibial epiphysis and metaphysis respectively. Participants with OSD also had higher odds of fluid/oedema at the patellar tendon (12.3 95%CI 3.3 to 46.6), and superficial infrapatellar bursitis (7.2). Participants with OSD had a more proximal tendon attachment (mean tibial attachment portion difference, -0.05, 95% CI: -0.1 to 0.0, p = 0.02), tendon thickness (proximal mean difference, -0.09, 95% CI: -0.4 to 0.2, p = 0.04; distal mean difference, -0.6, 95% CI: -0.9 to -0.2, p = 0.01). Those with bony/tendon oedema had 1.8 points (95% CI: 0.3 to 3.2) higher pain on palpation than those without (t = -2.5, df = 26.6, p = 0.019), but there was no difference between these groups in a functional single leg pain provocation. CONCLUSION Adolescents with OSD present with tissue and structural abnormalities on MRI that differed from age-matched controls. The majority had findings in the patellar tendon and bone, which often co-occurred. However, a small proportion of OSD also presents without alterations. It appears these findings may be associated with clinical OSD-related pain on palpation of the tibial tuberosity. CLINICAL RELEVANCE Our highlight the pathophysiology on imaging, which has implications for understanding the mechanism and treatment of OSD.
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Affiliation(s)
- L B Sørensen
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - S Holden
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
- School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland
- Institute for Sport and Health, University College Dublin, Dublin, Ireland
| | - E H G Oei
- Department of Radiology and Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - S P Magnusson
- Department of Orthopaedic Surgery M, Institute of Sports Medicine, Copenhagen, Denmark
- Department of Physical Therapy, Bispebjerg Hospital, Copenhagen, Denmark
| | - J L Olesen
- Center for General Practice at Aalborg University, Aalborg, Denmark
| | - B J F Dean
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Science (NDORMS), Botnar Research Centre, University of Oxford, Oxford, UK
| | - M Hever
- Department of Radiology, Aalborg University, Aalborg, Denmark
| | - K Lyng
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
- Center for General Practice at Aalborg University, Aalborg, Denmark
| | - M S Rathleff
- Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
- Center for General Practice at Aalborg University, Aalborg, Denmark
- Department of Occupational Therapy and Physiotherapy, Aalborg University Hospital, Aalborg, Denmark
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Larsen JB, Madeleine P, Sørensen LB, Sachau J, Otto JC, Baron R, Arendt-Nielsen L. Subgrouping of facilitatory or inhibitory conditioned pain modulation responses in patients with chronic knee pain. Explorative analysis from a multicentre trial. Eur J Pain 2024; 28:335-351. [PMID: 37746845 DOI: 10.1002/ejp.2185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 07/07/2023] [Accepted: 09/08/2023] [Indexed: 09/26/2023]
Abstract
BACKGROUND Facilitatory and inhibitory conditioned pain modulation (CPM) responses are observed in healthy volunteers and chronic pain patients, but the clinical implications for phenotyping are unknown. This study aimed to subgroup and compare chronic knee pain patients according to their CPM responses. METHODS This explorative, cross-sectional study included 127 patients with chronic knee pain (osteoarthritis or following total knee arthroplasty). Individual CPM responses were categorized as facilitatory (test stimuli pain intensity increased when conditioning stimuli were applied), as inhibitory (test stimuli pain intensity decreased) or as no change (defined as less than 5.3% change in pain intensity). Outcomes were clinical pain intensities, temporal summation, widespread pain, self-reported physical function, PainDETECT questionnaire and Pain Quality Assessment Scale. Data were analysed as comparisons between the inhibitory and the facilitatory groups and using multivariate linear regression models. RESULTS Fifty-four patients had facilitatory CPM responses, 49 had inhibitory CPM responses, and 24 showed no change in CPM response. A between-group difference was observed for self-reported physical function, with the facilitatory CPM group reporting better function (54.4 vs. 46.0, p = 0.028) and the facilitatory CPM group reported more deep pain sensations (3.2 vs. 2.0, p = 0.021). The remaining outcomes showed no between-group differences. Higher clinical pain intensity and facilitated temporal summation were associated in the facilitated CPM group but not in the inhibitory CPM group. CONCLUSION These explorative findings indicated that quantitative clinical and experimental differences exist between facilitatory or inhibitory CPM responses in a chronic knee pain patient population. Differences in patients' CPM responses should be further investigated to unravel possible clinical importance. SIGNIFICANCE Our findings confirm that conditioned pain modulation consist of inhibitory and facilitatory responders among a patient population with chronic knee pain. This explorative study indicates that patients with either facilitatory or inhibitory conditioned pain modulation could exhibit differences in pain outcomes. Subgrouping of chronic pain patients depending on individual conditioned pain modulation responses could be considered in phenotyping patients prior to inclusion in clinical trials or used for personalizing the management regime.
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Affiliation(s)
- J B Larsen
- Musculoskeltal Health and Implementation, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - P Madeleine
- Sport Sciences - Performance and Technology, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - L B Sørensen
- Musculoskeltal Health and Implementation, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - J Sachau
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - J C Otto
- Ameos Clinic Eutin, Eutin, Germany
| | - R Baron
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - L Arendt-Nielsen
- Center for Neuroplasticity and Pain, Department of Health Science and Technology, School of Medicine, Aalborg University, Aalborg, Denmark
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
- Steno Diabetes Center North Denmark, Clinical Institute, Aalborg University Hospital, Aalborg, Denmark
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Lyng KD, Sørensen LB, Platzer OJ, Pedersen SK, Gürühan S, Vasconcelos G, de Vos RJ, Rathleff MS. There is a Lack of Clinical Homogeneity in Lower-Limb Tendinopathy Trials: A Scoping Review. J Orthop Sports Phys Ther 2024; 54:1-10. [PMID: 38051676 DOI: 10.2519/jospt.2023.11722] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
OBJECTIVE: It is unclear if clinical trials of treatments for lower-limb tendinopathies include clinically homogeneous participant populations (an assumption for pooling in meta-analyses). We assessed the recruitment setting and participant characteristics used in randomized controlled trials (RCTs) that were investigating any treatment for lower-limb tendinopathies. DESIGN: Scoping review. METHODS: We conducted a systematic literature search in the PubMed, Embase, Cochrane CENTRAL, and Web of Science databases. All RCTs that were investigating treatments for lower-limb tendinopathies in an adult population (≥18 years) were eligible for inclusion. At least 2 authors conducted independent screening and selection of full-text papers, and extracted data from included studies. RESULTS: Of 18 341 records, 342 RCTs (21 897 participants) were eligible for inclusion and data extraction. The most common diagnoses were plantar fasciopathy (n = 195, 57%), Achilles tendinopathy (n = 82, 24%), and patellar tendinopathy (n = 41, 12%). Secondary care (n = 144, 42%) was the most reported recruitment setting, followed by an open setting (n = 44, 13%). In 93 (27%) RCTs, the recruitment setting was not described. We found high heterogeneity in participant characteristics (eg, symptom duration, age, body mass index, and the Victorian Institute of Sport Assessment [VISA] questionnaire score) within and between recruitment settings. CONCLUSION: Our results question whether clinical homogeneity can be adequately assumed in clinical trials of lower-limb tendinopathies due to the lack of clear reporting of the recruitment setting and the variability within and between recruitment settings of key participant characteristics. These findings threaten assumptions for meta-analyses in lower-limb tendinopathies. J Orthop Sports Phys Ther 2024;54(1):1-10. Epub 5 December 2023. doi:10.2519/jospt.2023.11722.
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Lyng KD, Sørensen LB, Olesen JL, Rathleff MS, Holden S. Do adolescents with Osgood-Schlatter display nociplastic pain manifestations compared to controls: A cross-sectional study. J Sci Med Sport 2023:S1440-2440(23)00085-3. [PMID: 37391284 DOI: 10.1016/j.jsams.2023.05.005] [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: 07/28/2022] [Revised: 05/10/2023] [Accepted: 05/16/2023] [Indexed: 07/02/2023]
Abstract
OBJECTIVES Osgood-Schlatter disease is an overuse musculoskeletal pain condition. The pain mechanism is considered nociceptive, but no studies have investigated nociplastic manifestations. This study investigated pain sensitivity and inhibition evaluated through exercise-induced hypoalgesia in adolescents with and without Osgood-Schlatter. DESIGN Cross-sectional study. METHODS Adolescents underwent a baseline assessment comprising clinical history, demographics, sports participation, and pain severity rated (0-10) during a 45-second anterior knee pain provocation test, consisting of an isometric single leg squat. Pressure pain thresholds were assessed bilaterally at the quadriceps, tibialis anterior muscle, and the patella tendon before and after a three-minute wall squat. RESULTS Forty-nine adolescents (27 Osgood-Schlatter, 22 controls) were included. There were no differences in the exercise-induced hypoalgesia effect between Osgood-Schlatter and controls. Overall, an exercise-induced hypoalgesia effect was detected at the tendon only in both groups with a 48 kPa (95 % confidence interval 14 to 82) increase in pressure pain thresholds from before to after exercise. Controls had higher pressure pain thresholds at the patellar tendon (mean difference 184 kPa 95 % confidence interval 55 to 313), tibialis anterior (mean difference 139 kPa 95 % confidence interval 24 to 254), and rectus femoris (mean difference 149 kPa 95 % confidence interval 33 to 265). Higher anterior knee pain provocation severity was associated with lower exercise-induced hypoalgesia at the tendon (Pearson correlation = 0.48; p = 0.011) in participants with Osgood-Schlatter. CONCLUSIONS Adolescents with Osgood-Schlatter display increased pain sensitivity locally, proximally, and distally but similar endogenous pain modulation compared to healthy controls. Greater Osgood-Schlatter severity appears to be associated with less efficient pain inhibition during the exercise-induced hypoalgesia paradigm.
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Affiliation(s)
- Kristian Damgaard Lyng
- Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark; Center for General Practice at Aalborg University, Denmark. https://twitter.com/kristianlyng_
| | - Line Bay Sørensen
- Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark. https://twitter.com/LineBaySrensen1
| | | | - Michael Skovdal Rathleff
- Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark; Center for General Practice at Aalborg University, Denmark; Department of Occupational Therapy and Physiotherapy, Aalborg University Hospital, Denmark. https://twitter.com/MichaelRathleff
| | - Sinead Holden
- Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark; UCD Clinical Research Centre, School of Medicine, University College Dublin, Ireland.
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Simonsen MB, Cancino EE, de Brito Silva P, Sørensen LB, Hirata RP, Christensen SWM. The impact of prolonged experimental neck pain on walking stability and gait kinematics - A parallel-group study. Clin Biomech (Bristol, Avon) 2023; 101:105869. [PMID: 36584579 DOI: 10.1016/j.clinbiomech.2022.105869] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/22/2022] [Accepted: 12/22/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Neck pain is a common problem in the general population, and movement adaptations are a natural response to pain. Previous studies have reported reduced trunk rotation during walking in those suffering from clinical neck pain. However, it is unknown how soon after the onset of pain, movement adaptations are adopted. This study investigated the effect of prolonged experimental neck pain four days after pain onset on gait kinematics during walking. METHODS Forty healthy participants were randomized to receive injections of nerve-growth-factor or a control injection of isotonic saline into the right splenius capitis muscle at the end of days 0 and 2. Participants performed two walking tasks, walking and walking while reading on a smartphone, on days 0, 4, and 15. Gait kinematics, spatiotemporal parameters, and gait stability were measured using Xsens Awinda. FINDINGS The nerve-growth-factor group reported increased neck pain intensity (median VAS 17.5 [IQR: 2.75-25.75]) on day 4 compared to day 0 and day 15. No pain intensity changes between days were reported for the isotonic-group. For gait kinematics, a main effect of the task was identified, showing that during the smartphone condition, participants had shorter stride lengths and reduced RoM for the trunk, hip, knee, and ankle compared to normal waking (P < 0.006). INTERPRETATION Walking while reading on a smartphone, but not mild neck muscle pain, caused changes in the gait kinematics compared to normal walking without neck pain. This finding suggests that movement alterations during walking are not an early feature of prolonged experimental neck pain.
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Affiliation(s)
| | - Edith Elgueta Cancino
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark; Center of Precision Rehabilitation for Spinal Pain, School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Priscila de Brito Silva
- Center of Precision Rehabilitation for Spinal Pain, School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Line Bay Sørensen
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark; Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | | | - Steffan Wittrup McPhee Christensen
- Department of Physiotherapy, University College of Northern Denmark, Aalborg, Denmark; Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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Sørensen LB, Rathleff MS, Dean BJF, Oei E, Magnusson SP, Olesen JL, Holden S. A systematic review of imaging findings in patients with Osgood‐Schlatter disease. Translational Sports Med 2021. [DOI: 10.1002/tsm2.281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Line Bay Sørensen
- Department of Health Science and Technology Aalborg University Aalborg Denmark
| | - Michael Skovdal Rathleff
- Department of Health Science and Technology Aalborg University Aalborg Denmark
- Center for General Practice at Aalborg University Aalborg Denmark
- Department of Occupational Therapy and Physiotherapy Department of Clinical Medicine Aalborg University Hospital Aalborg Denmark
| | - Benjamin John Floyd Dean
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Science (NDORMS) Botnar Research Centre University of Oxford Oxford UK
| | - Edwin Oei
- Department of Radiology & Nuclear Medicine of Erasmus MC University Medical Center Rotterdam The Netherlands
| | - Stig Peter Magnusson
- Department of Orthopaedic Surgery M Institute of Sports Medicine Bispebjerg Hospital Copenhagen Denmark
| | | | - Sinéad Holden
- Department of Health Science and Technology Aalborg University Aalborg Denmark
- Center for General Practice at Aalborg University Aalborg Denmark
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Sørensen LB, Rathleff MS, Dean BJF, Oei E, Magnusson SP, Olesen JL, Holden S. Cover Image. Translational Sports Med 2021. [DOI: 10.1002/tsm2.299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sørensen LB, Gazerani P, Sluka KA, Graven-Nielsen T. Repeated Injections of Low-Dose Nerve Growth Factor (NGF) in Healthy Humans Maintain Muscle Pain and Facilitate Ischemic Contraction-Evoked Pain. Pain Med 2020; 21:3488-3498. [PMID: 33111942 DOI: 10.1093/pm/pnaa315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Nerve growth factor (NGF) is essential for generating and potentiating pain responses. This double-blinded crossover study assessed NGF-evoked pain in healthy humans after repeated NGF injections in the tibialis anterior (TA) muscle compared with control injections of isotonic saline. SUBJECTS Twenty healthy subjects participated in two experimental phases; each consisted of seven sessions over 21 days. METHODS At day 0, day 2, and day 4, a low-dose NGF (1 µg) was injected. Data on daily self-reported muscle pain (using a Likert scale) were collected. Data on pressure pain thresholds (PPTs), pain evoked by nonischemic and ischemic muscle contractions (using a numerical rating scale [NRS]), pressure pain detection (PDT), and pain tolerance thresholds (PTTs) to cuff algometry were recorded before day 0 and at 1, 2, 4, 7, 10, and 21 days after the first injection. Temporal summation of pain (TSP) and conditioned pain modulation (CPM) were recorded to assess central pain mechanisms. RESULTS Likert scores remained elevated for 9 days after NGF injection (P<0.05). PPTs at the TA muscle were decreased at day 1 until day 7 after NGF injection compared with day 0 (P=0.05). In subjects presenting with NGF-induced muscle hyperalgesia, pain NRS scores evoked by nonischemic contractions were higher after NGF injection at day 4 and day 7 (P<0.04) compared with the control condition. At all time points, higher pain NRS scores were found with ischemic compared with nonischemic contractions (P<0.05). The pain NRS after ischemic contractions was elevated following prolonged NGF hyperalgesia at day 7 compared with the control condition and day 0 (P<0.04). The PDT, PTT, TSP, and CPM remained unchanged during the period of NGF-induced hyperalgesia. CONCLUSIONS Repeated low-dose NGF injections maintain muscle pain and potentiate pain evoked by ischemic contractions during prolonged NGF hyperalgesia.
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Affiliation(s)
- Line Bay Sørensen
- Department of Health Science and technology, Center for Neuroplasticity and Pain (CNAP), Aalborg University, Aalborg, Denmark
| | - Parisa Gazerani
- Biomedicine, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Kathleen A Sluka
- Department of Physical Therapy and Rehabilitation Science, Neuroscience Institute, University of Iowa, Iowa City, Iowa, USA
| | - Thomas Graven-Nielsen
- Department of Health Science and technology, Center for Neuroplasticity and Pain (CNAP), Aalborg University, Aalborg, Denmark
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Sørensen LB, Gazerani P, Graven-Nielsen T. Nerve growth factor-induced muscle hyperalgesia facilitates ischaemic contraction-evoked pain. Eur J Pain 2019; 23:1814-1825. [PMID: 31314952 DOI: 10.1002/ejp.1455] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 07/01/2019] [Accepted: 07/10/2019] [Indexed: 02/03/2023]
Abstract
BACKGROUND Intramuscular injection of Nerve Growth Factor (NGF) may influence the responsiveness of active chemo-sensitive channels affecting muscle pain sensitivity. This double-blinded crossover study in healthy humans assessed contraction-evoked pain responses and pain sensitivity during acute ischaemia in the tibialis anterior (TA) muscle before and 24 hr after five distributed NGF injections (1 µg, 4 cm interval) compared with control injections (isotonic-saline). METHODS Twenty-one subjects participated in two experimental phases, each including five sessions over 7 days, with a gap of 4 weeks in-between. Muscle pain intensity evoked with daily functional tasks (Likert scale score) was collected using a paper diary. Pain intensity evoked by ischaemic and non-ischaemic contractions numerical rating scale (NRS) was collected at Day0 and Day1. Pressure pain thresholds (PPTs) on the TA were recorded before (Day0), 3 hr, 1, 3, and 7 days post-injection, and after the ischaemic-contractions and post-cuff deflation at Day0 and Day1. RESULTS Increased Likert scores of pain were present for 7 days after NGF compared to control injections (p < .05). Higher NRS pain scores of ischaemic-contractions were seen when contracting the muscle injected with NGF compared to baseline (p = .003) and control (p = .012). Pain during non-ischaemic contractions was not significantly affected by NGF injections. Decreased PPTs were found at 3 hr, Day1 and Day3 post-injection (p < .05) in both conditions. Compared with pre-contractions, PPTs were increased following ischaemic contractions at Day0 (p < .05) and Day1 (p < .05) in both conditions. CONCLUSION This study showed that ischaemic contraction-evoked pain was facilitated in an NGF-sensitized muscle. SIGNIFICANCE Acidification of the muscle environment may affect muscle nociceptors and pain by different mechanisms, including activation of ASIC3 and TRPV1. In this study, pain evoked following ischaemic contractions was increased in the Nerve Growth Factor (NGF)-sensitized muscle compared with non-ischaemic contractions and in the non-sensitized muscle. These findings illustrate that responses of peripheral afferents under ischaemic conditions are altered by a pre-sensitized muscle. This highlights the role of growth factors, including NGF, in peripheral muscle sensitization with clinical implications for ischaemic myalgia.
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Affiliation(s)
- Line Bay Sørensen
- Center for Neuroplasticity and Pain (CNAP), SMI, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Parisa Gazerani
- Biomedicine, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Thomas Graven-Nielsen
- Center for Neuroplasticity and Pain (CNAP), SMI, Faculty of Medicine, Aalborg University, Aalborg, Denmark
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Sørensen LB, Gazerani P, Wåhlén K, Ghafouri N, Gerdle B, Ghafouri B. Investigation of biomarkers alterations after an acute tissue trauma in human trapezius muscle, using microdialysis. Sci Rep 2018; 8:3034. [PMID: 29445230 PMCID: PMC5813028 DOI: 10.1038/s41598-018-21185-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 01/30/2018] [Indexed: 02/08/2023] Open
Abstract
Alterations in muscle milieu are suggested as important activity of peripheral drive in patients with chronic musculoskeletal pain (CMP). Microdialysis (MD) has been used in monitoring altered metabolic response pattern in muscles. However, the insertion of MD probe causes a local tissue trauma. Whether and how metabolites in trapezius muscle are affected by acute tissue trauma is unknown. Hence, this study investigated the metabolic response and nociceptive reaction of the tissue following MD probe insertion in patients with CMP and healthy individuals. Fifty-nine patients and forty pain-free volunteers were recruited. Pressure pain thresholds (PPTs) were obtained at the trapezius and tibialis muscles. Pain questionnaires determined the levels of pain related aspects. MD (20 kDa cut-off) was performed in the trapezius and samples were collected within 40 min. Interstitial concentration of the metabolites was analyzed by a two-way-mixed-ANOVA. The metabolic response pattern changed over time and alterations in the level of metabolites could be seen in both CMP and healthy controls. Pain questionnaires and pain intensities manifested clinical aspects of pain closely to what CMP patients describe. Analyzing metabolites due to acute tissue trauma by aid of MD may be a useful model to investigate altered metabolic response effect in CMP.
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Affiliation(s)
- Line Bay Sørensen
- Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science and Technology, School of Medicine and Health, Aalborg University, Aalborg, Denmark.
| | - Parisa Gazerani
- Center for Neuroplasticity and Pain (CNAP), SMI®, Department of Health Science and Technology, School of Medicine and Health, Aalborg University, Aalborg, Denmark
| | - Karin Wåhlén
- Pain and Rehabilitation Centre, and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | - Nazdar Ghafouri
- Pain and Rehabilitation Centre, and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | - Björn Gerdle
- Pain and Rehabilitation Centre, and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | - Bijar Ghafouri
- Pain and Rehabilitation Centre, and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
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Sørensen LB, Damsgaard CT, Petersen RA, Dalskov SM, Hjorth MF, Dyssegaard CB, Egelund N, Tetens I, Astrup A, Lauritzen L, Michaelsen KF. Differences in the effects of school meals on children's cognitive performance according to gender, household education and baseline reading skills. Eur J Clin Nutr 2016; 70:1155-1161. [PMID: 27302673 DOI: 10.1038/ejcn.2016.99] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 04/18/2016] [Accepted: 04/20/2016] [Indexed: 11/09/2022]
Abstract
BACKGROUND/OBJECTIVES We previously found that the OPUS School Meal Study improved reading and increased errors related to inattention and impulsivity. This study explored whether the cognitive effects differed according to gender, household education and reading proficiency at baseline. SUBJECTS/METHODS This is a cluster-randomised cross-over trial comparing Nordic school meals with packed lunch from home (control) for 3 months each among 834 children aged 8 to 11 years. At baseline and at the end of each dietary period, we assessed children's performance in reading, mathematics and the d2-test of attention. Interactions were evaluated using mixed models. Analyses included 739 children. RESULTS At baseline, boys and children from households without academic education were poorer readers and had a higher d2-error%. Effects on dietary intake were similar in subgroups. However, the effect of the intervention on test outcomes was stronger in boys, in children from households with academic education and in children with normal/good baseline reading proficiency. Overall, this resulted in increased socioeconomic inequality in reading performance and reduced inequality in impulsivity. Contrary to this, the gender difference decreased in reading and increased in impulsivity. Finally, the gap between poor and normal/good readers was increased in reading and decreased for d2-error%. CONCLUSIONS The effects of healthy school meals on reading, impulsivity and inattention were modified by gender, household education and baseline reading proficiency. The differential effects might be related to environmental aspects of the intervention and deserves to be investigated further in future school meal trials.
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Affiliation(s)
- L B Sørensen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - C T Damsgaard
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - R A Petersen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - S-M Dalskov
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - M F Hjorth
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - C B Dyssegaard
- Department of Education, Faculty of Arts, Aarhus University, Copenhagen, Denmark
| | - N Egelund
- Department of Education, Faculty of Arts, Aarhus University, Copenhagen, Denmark
| | - I Tetens
- Division of Nutrition, The National Food Institute, Technical University of Denmark, Søborg, Denmark
| | - A Astrup
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - L Lauritzen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
| | - K F Michaelsen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Frederiksberg C, Denmark
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Dalskov S, Ritz C, Larnkjær A, Damsgaard CT, Petersen RA, Sørensen LB, Ong KK, Astrup A, Michaelsen KF, Mølgaard C. Associations between adiposity, hormones, and gains in height, whole-body height-adjusted bone size, and size-adjusted bone mineral content in 8- to 11-year-old children. Osteoporos Int 2016; 27:1619-1629. [PMID: 26667245 DOI: 10.1007/s00198-015-3428-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 11/13/2015] [Indexed: 12/31/2022]
Abstract
UNLABELLED We examined fat-independent associations of hormones with height and whole-body bone size and mineral content in 633 school children. IGF-1 and osteocalcin predict growth in height, while fat, osteocalcin, and in girls also, IGF-1 predict growth in bone size. Leptin and ghrelin are inversely associated with bone size in girls. INTRODUCTION Obesity causes larger bone size and bone mass, but the role of hormones in this up-regulation of bone in obesity is not well elucidated. We examined longitudinal associations between baseline body fat mass (FM), and fat-independent fasting levels of ghrelin, adiponectin, leptin, insulin, insulin-like growth factor-I (IGF-1), osteocalcin, and intact parathyroid hormone, and subsequent changes in height and in whole-body height-adjusted bone area "BAheight" and size-adjusted bone mineral content "BMCsize" in 8- to 11-year-olds. METHODS Analyses were carried out separately for boys (n = 325) and girls (n = 308) including data from baseline, 3 and 6 months from OPUS School Meal Study. RESULTS In both sexes: gain in BAheight was positively associated with baseline FM (≥2.05 cm(2)/kg, both p ≤ 0.003). Furthermore, gain in height was positively associated with baseline IGF-1 (≥0.02 cm/ng/ml, p = 0.001) and osteocalcin (≥0.13 cm/ng/ml, p ≤ 0.009); and gain in BAheight was positively associated with baseline osteocalcin (≥0.35 cm(2)/ng/ml, p ≤ 0.019). In girls only, gain in BAheight was also positively associated with baseline IGF-1 (0.06 cm(2)/ng/ml, p = 0.017) and inversely associated with both baseline ghrelin (-0.01 cm(2)/pg/ml, p = 0.001) and leptin (-1.21 cm(2)/μg/ml, p = 0.005). In boys, gain in BMCsize was positively associated with osteocalcin (0.18 g/ng/ml, p = 0.030). CONCLUSIONS This large longitudinal study suggests that in 8- to 11-year-old children, IGF-1 and osteocalcin predict growth in height, while FM, osteocalcin, and in girls also, IGF-1 predict growth in BAheight. Fat-independent inverse associations of leptin and ghrelin with BAheight in girls' are contrary to proposed growth-stimulating effects of leptin. Osteocalcin in boys predicts gain in BMCsize.
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Affiliation(s)
- S Dalskov
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark.
| | - C Ritz
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - A Larnkjær
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - C T Damsgaard
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - R A Petersen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - L B Sørensen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - K K Ong
- MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, UK
| | - A Astrup
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - K F Michaelsen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - C Mølgaard
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
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Abstract
OBJECTIVE How much do the sensory properties of food influence the way people select their food and how much they eat? The objective of this paper is to review results from studies investigating the link between the sensory perception of food and human appetite regulation. CONTENT OF THE REVIEW The influence of palatability on appetite and food intake in humans has been investigated in several studies. All reviewed studies have shown increased intake as palatability increased, whereas assessments of the effect of palatability using measures of subjective appetite sensations have shown diverging results, for example, subjects either feel more hungry and less full after a palatable meal compared to a less palatable meal, or they feel the opposite, or there is no difference. Whether palatability has an effect on appetite in the period following consumption of a test meal is unclear. Several studies have investigated which sensory properties of food are involved in sensory-specific satiety. Taste, smell, texture and appearance-specific satieties have been identified, whereas studies on the role of macronutrients and the energy content of the food in sensory-specific satiety have given equivocal results. Different studies have shown that macronutrients and energy content play a role in sensory-specific satiety or that macronutrients and energy content are not a factor in sensory-specific satiety. Sensory-specific satiety may have an important influence on the amount of food eaten. Studies have shown that increasing the food variety can increase food and energy intake and in the short to medium term alter energy balance. Further knowledge about the importance of flavour in appetite regulation is needed, for example, which flavour combinations improve satiety most, the possible connection between flavour intensity and satiety, the effect of persistence of chemesthetic sensation on palatability and satiety, and to what extent genetic variation in taste sensitivity and perception influences dietary habits and weight control.
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Affiliation(s)
- L B Sørensen
- Department of Human Nutrition, Centre for Advanced Food Studies, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
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Abstract
AIMS The aims of this study were to examine the in vitro enzyme kinetics and CYP isoform selectivity of perhexiline monohydroxylation using human liver microsomes. METHODS Conversion of rac-perhexiline to monohydroxyperhexiline by human liver microsomes was assessed using a high-performance liquid chromatography assay with precolumn derivatization to measure the formation rate of the product. Isoform selective inhibitors were used to define the CYP isoform profile of perhexiline monohydroxylation. RESULTS The rate of perhexiline monohydroxylation with microsomes from 20 livers varied 50-fold. The activity in 18 phenotypic perhexiline extensive metabolizer (PEM) livers varied about five-fold. The apparent Km was 3.3 +/- 1.5 micro m, the Vmax was 9.1 +/- 3.1 pmol min-1 mg-1 microsomal protein and the in vitro intrinsic clearance (Vmax/Km) was 2.9 +/- 0.5 micro l min-1 mg-1 microsomal protein in the extensive metabolizer livers. The corresponding values in the poor metabolizer livers were: apparent Km 124 +/- 141 micro m; Vmax 1.4 +/- 0.6 pmol min-1 mg-1 microsomal protein; and intrinsic clearance 0.026 micro l min-1 mg-1 microsomal protein. Quinidine almost completely inhibited perhexiline monohydroxylation activity, but inhibitors selective for other CYP isoforms had little effect. CONCLUSIONS Perhexiline monohydroxylation is almost exclusively catalysed by CYP2D6 with activities being about 100-fold lower in CYP2D6 poor metabolizers than in extensive metabolizers. The in vitro data predict the in vivo saturable metabolism and pharmacogenetics of perhexiline.
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Affiliation(s)
- L B Sørensen
- Department of Clinical Pharmacology, Flinders Medical Centre and Flinders University of South Australia, Bedford Park, Australia
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Sørensen LB, Flint A, Raben A, Hartmann B, Holst JJ, Astrup A. No effect of physiological concentrations of glucagon-like peptide-2 on appetite and energy intake in normal weight subjects. Int J Obes (Lond) 2003; 27:450-6. [PMID: 12664078 DOI: 10.1038/sj.ijo.0802247] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To examine the effect of a GLP-2 infusion on appetite sensations and ad libitum energy intake in healthy, normal weight humans. DESIGN The experiment was performed in a randomised, blinded, and placebo-controlled crossover design. Placebo or GLP-2 was infused (infusion rate of 25 pmol/kg body wth) for 4.5 h. SUBJECTS A total of 18 healthy, normal weight young subjects participated; eight women and 10 men. MEASUREMENTS During the infusion, subjects recorded their appetite sensations every 30 min using visual analogue scales, and blood was sampled frequently. After 2 h of infusion, an ad libitum meal, consisting of sandwiches, was served. RESULTS The concentration of GLP-2 was significantly higher during the GLP-2 infusion compared with placebo (P<0.0001) and increased further in both conditions in response to the meal. Neither appetite sensations, nor palatability of the test meals, or energy intake were different on the two occasions. Glucose, GLP-1, insulin, and GIP responses were also unaffected by the infusion, whereas glucagon levels were higher during the GLP-2 treatment (P<0.05). CONCLUSION Circulating GLP-2 in physiological concentrations does not seem to play a significant role in human appetite regulation.
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Affiliation(s)
- L B Sørensen
- Department of Human Nutrition, Centre for Advanced Food Studies, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
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