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Lindblom H, Pernett F, Schagatay E, Holmström P. Effect of exercise intensity and apnea on splenic contraction and hemoglobin increase in well-trained cross-country skiers. Eur J Appl Physiol 2024:10.1007/s00421-024-05428-z. [PMID: 38393417 DOI: 10.1007/s00421-024-05428-z] [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: 10/19/2023] [Accepted: 01/30/2024] [Indexed: 02/25/2024]
Abstract
The human spleen acts as a reservoir for red blood cells, which is mobilized into the systemic circulation during various conditions such as hypoxia and physical exertion. Cross-country (XC) skiers, renowned for their exceptional aerobic capacity, are regularly exposed to high-intensity exercise and local oxygen deficits. We investigated a putative dose-dependent relationship between splenic contraction and concomitant hemoglobin concentration ([Hb]) elevation across four exercise intensities in well-trained XC skiers. Fourteen male XC skiers voluntarily participated in a 2-day protocol, encompassing a serial apnea test and a [Formula: see text]O2max test (day 1), followed by three submaximal exercise intensities on a roller skiing treadmill corresponding to 55, 70, and 85% of [Formula: see text]O2max (day 2). Spleen volume was measured via ultrasonic imaging, and venous blood samples were used to determine [Hb] levels. Baseline spleen volume was similar (266(35) mL) for all conditions (NS). Notably, all conditions induced significant splenic contractions and transient [Hb] elevations. The [Formula: see text]O2max test exhibited the most pronounced splenic contraction (35.8%, p < 0.001) and a [Hb] increase of 8.1%, while the 85% exercise intensity led to 27.1% contraction and the greatest [Hb] increase (8.3%, < 0.001) compared to baseline. The apnea test induced relatively smaller responses (splenic contraction: 20.4%, [Hb] = 3.3%, p < 0.001), akin to the response observed at the 70% exercise intensity (splenic contraction = 23%, [Hb] = 6.4%, p < 0,001) and 55% (splenic contraction = 20.0%, [Hb] = 4.8%, p < 0.001). This study shows a discernible dose-dependent relationship between splenic contraction and [Hb] increase with levels of exercise, effectively distinguishing between submaximal and maximal exercise intensity.
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Affiliation(s)
- Hampus Lindblom
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Frank Pernett
- Environmental Physiology Group, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Erika Schagatay
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
- Environmental Physiology Group, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Pontus Holmström
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
- Environmental Physiology Group, Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
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Vasavada KD, Shankar DS, Ross KA, Avila A, Buzin S, Jazrawi IB, Carter CW, Chen AL, Borowski LE, Milton HA, Gonzalez-Lomas G. Patient-reported hip pain and function are worse among elite Nordic ski athletes competing in ski jumping versus Nordic combined: a cross-sectional analysis. J ISAKOS 2024:S2059-7754(24)00010-5. [PMID: 38278215 DOI: 10.1016/j.jisako.2024.01.010] [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: 06/02/2023] [Revised: 11/25/2023] [Accepted: 01/15/2024] [Indexed: 01/28/2024]
Abstract
OBJECTIVES Nordic ski athletes are at increased risk of developing hip pain and dysfunction secondary to femoroacetabular impingement syndrome (FAIS), but it is unclear whether hip symptomatology differs between ski jumping (SJ) and Nordic combined (NC) athletes. The purpose of this study was to compare patient-reported hip pain and dysfunction between elite Nordic ski athletes participating in SJ versus NC. METHODS A cross-sectional study was conducted involving SJ and NC athletes who competed at the international and U.S. national levels during the 2021-2022 season. Subjects were excluded if they had hip surgery within two years prior to enrollment. Subjects were asked to undergo diagnostic workups for FAIS, including physical examination and plain radiographic imaging. Subjects were asked to complete a survey that collected information on athletic and training history and to complete the hip disability and osteoarthritis outcome score (HOOS). Demographics, athletic/training history, and HOOS sub-scores were compared between the SJ and NC groups using the Student's t-test, Wilcoxon rank-sum test, or Fisher's exact test, as appropriate. p-values < 0.05 were considered significant. RESULTS Twenty-four athletes (13 SJ, 11 NC) were included in the study. There were no statistically significant differences in age, sex, BMI, or age of menarche between the two groups (all p > 0.05). There were also no statistically significant differences in the number of prior sports participated in, total hours of participation in prior sports, or total hours of training in Nordic specialization (all p > 0.05). Among the 18 athletes who underwent physical examination (9 SJ, 9 NC), there were no statistically significant inter-group differences in hip range of motion or incidence of positive impingement tests (all p > 0.05). Among the 19 athletes who underwent imaging (9 SJ, 10 NC), there were no statistically significant inter-group differences in the incidence of cam or pincer morphology in at least one hip (all p > 0.05). SJ athletes had statistically significantly worse HOOS sub-scores for hip symptoms and stiffness, hip function in sports/recreational activities, and hip-related quality of life compared to NC athletes (all p < 0.05). CONCLUSION Elite SJ athletes have worse self-reported hip function compared to elite NC athletes, despite comparable demographics, athletic history, and duration of ski training. LEVEL OF EVIDENCE IV.
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Affiliation(s)
- Kinjal D Vasavada
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA.
| | - Dhruv S Shankar
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Keir A Ross
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Amanda Avila
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Scott Buzin
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Isabella B Jazrawi
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Cordelia W Carter
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
| | - Andrew L Chen
- The Alpine Clinic, Franconia, NH, 10029, USA; USA Nordic Sport, Park City, UT, 10029, USA
| | - Lauren E Borowski
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA; USA Nordic Sport, Park City, UT, 10029, USA
| | - Heather A Milton
- New York University School of Medicine, Sports Performance Center, New York, NY, 10029, USA
| | - Guillem Gonzalez-Lomas
- New York University School of Medicine, Department of Orthopedic Surgery, New York, NY, 10029, USA
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Lund-Hansen M, Gløersen Ø, Rud B, Losnegard T. What is the optimal classical style sub-technique during uphill roller skiing in elite male cross-country skiers? Eur J Appl Physiol 2023; 123:2833-2842. [PMID: 37395762 PMCID: PMC10638140 DOI: 10.1007/s00421-023-05261-w] [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: 09/23/2022] [Accepted: 06/16/2023] [Indexed: 07/04/2023]
Abstract
PURPOSE To compare performance, physiological and biomechanical responses between double poling (DP) and diagonal stride (DIA) during treadmill roller skiing in elite male cross-country skiers. METHOD Twelve skiers (VO2peak DIAup; 74.7 ± 3.7 ml kg-1 min-1) performed two DP conditions at 1° (DPflat) and 8° (DPup) incline, and one DIA condition, 8° (DIAup). Submaximal gross efficiency (GE) and maximal 3.5 min time-trial (TT) performance, including measurements of VO2peak and maximal accumulated O2-deficit (MAOD), were determined. Temporal patterns and kinematics were assessed using 2D video, while pole kinetics were obtained from pole force. RESULTS DIAup induced (mean, [95% confidence interval]) 13% [4, 22] better 3.5-min TT performance, 7%, [5, 10]) higher VO2peak and 3% points [1, 5] higher GE compared to DPup (all P < 0.05). DPup induced 120% higher MAOD compared to DPflat, while no significant differences were observed for VO2peak or GE between DPflat and DPup. There was a large correlation between performance and GE in DP and a large correlation between performance and VO2peak for DIAup (all r = 0.7-0.8, P < 0.05). No correlations were found between performance and VO2peak for any of the DP conditions, nor between performance and GE for DIAup (r = 0.0-0.2, P > 0.1). CONCLUSION At 8º uphill roller skiing, DIAup induce higher VO2peak, GE, and superior time-trial performance than DPup in elite male skiers. There was no difference between VO2peak or GE between DPflat and DPup. A large correlation was observed between DIAup performance and DIAup VO2peak, while DP performance was best correlated to submaximal GE.
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Affiliation(s)
- Magne Lund-Hansen
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway
| | - Øyvind Gløersen
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway
- Smart Sensors and Microsystems, SINTEF Digital, Oslo, Norway
| | - Bjarne Rud
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway
| | - Thomas Losnegard
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post Box 4014, 0806, Oslo, Norway.
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Andersson EP, Lögdal N, Byrne D, Jones TW. Physiological responses and performance factors for double-poling and diagonal-stride treadmill roller-skiing time-trial exercise. Eur J Appl Physiol 2023; 123:2495-2509. [PMID: 37302104 PMCID: PMC10615977 DOI: 10.1007/s00421-023-05239-8] [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: 09/12/2022] [Accepted: 05/23/2023] [Indexed: 06/13/2023]
Abstract
PURPOSE To compare physiological responses between a self-paced 4-min double-poling (DP) time-trial (TTDP) versus a 4-min diagonal-stride (DS) time-trial (TTDS). The relative importance of peak oxygen uptake ([Formula: see text]O2peak), anaerobic capacity, and gross efficiency (GE) for projection of 4-min TTDP and TTDS roller-skiing performances were also examined. METHODS Sixteen highly trained male cross-country skiers performed, in each sub-technique on separate occasions, an 8 × 4-min incremental submaximal protocol, to assess individual metabolic rate (MR) versus power output (PO) relationships, followed by a 10-min passive break and then the TTDP or TTDS, with a randomized order between sub-techniques. RESULTS In comparison to TTDS, the TTDP resulted in 10 ± 7% lower total MR, 5 ± 4% lower aerobic MR, 30 ± 37% lower anaerobic MR, and 4.7 ± 1.2 percentage points lower GE, which resulted in a 32 ± 4% lower PO (all P < 0.01). The [Formula: see text]O2peak and anaerobic capacity were 4 ± 4% and 30 ± 37% lower, respectively, in DP than DS (both P < 0.01). The PO for the two time-trial (TT) performances were not significantly correlated (R2 = 0.044). Similar parabolic pacing strategies were used during both TTs. Multivariate data analysis projected TT performance using [Formula: see text]O2peak, anaerobic capacity, and GE (TTDP, R2 = 0.974; TTDS, R2 = 0.848). The variable influence on projection values for [Formula: see text]O2peak, anaerobic capacity, and GE were for TTDP, 1.12 ± 0.60, 1.01 ± 0.72, and 0.83 ± 0.38, respectively, and TTDS, 1.22 ± 0.35, 0.93 ± 0.44, and 0.75 ± 0.19, respectively. CONCLUSIONS The results show that a cross-country skier's "metabolic profile" and performance capability are highly sub-technique specific and that 4-min TT performance is differentiated by physiological factors, such as [Formula: see text]O2peak, anaerobic capacity, and GE.
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Affiliation(s)
- Erik P Andersson
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
- School of Sport Sciences, Faculty of Health Sciences, UiT the Arctic University of Norway, Tromsø, Norway.
| | - Nestor Lögdal
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
- Centre for Musculoskeletal Research, Department of Occupational and Public Health Sciences, University of Gävle, Gävle, Sweden
| | - Darragh Byrne
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Thomas W Jones
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK
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Mäki-Heikkilä R, Koskela H, Karjalainen J, Parkkari J, Huhtala H, Valtonen M, Lehtimäki L. Cross-country skiers often experience respiratory symptoms during and after exercise but have a low prevalence of prolonged cough. BMJ Open Sport Exerc Med 2023; 9:e001502. [PMID: 37342789 PMCID: PMC10277524 DOI: 10.1136/bmjsem-2022-001502] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/25/2023] [Indexed: 06/23/2023] Open
Abstract
Background Cross-country skiers train and compete during the winter for long periods of time in subfreezing conditions, which strains the airways and provokes respiratory symptoms. This study aimed to compare the prevalence of exercise-related symptoms and prolonged cough in competitive cross-country skiers versus the general population and to investigate the association between these symptoms and asthma. Methods A questionnaire was sent to Finnish cross-country skiers (n=1282) and a random sample of the general population (n=1754), with response rates of 26.9% and 19.0%, respectively. Results Both groups were mostly asymptomatic at rest, but symptoms were increased in both groups during and after exercise. Cough was more prevalent after exercise in skiers and phlegm production was more common during and after exercise in skiers. Asthma did not provoke specific symptoms, but symptom prevalence was higher in asthmatic individuals. Skiers had a higher prevalence of cough after exercise (60.6% vs 22.8%, p<0.001) compared with controls, but controls had a higher prevalence of prolonged cough (4.1% vs 9.6%, p=0.004). In participants without asthma, cold air triggered symptoms more often in skiers than controls, while strong odours triggered symptoms more often in asthmatic controls than skiers. Chronic cough lasting more than 8 weeks was rare, reported by 4.8% of controls and 2.0% of skiers. Conclusion Cross-country skiers, especially those with asthma, experience a higher burden of exercise-related respiratory symptoms compared with controls. However, repeated exposure to cold air does not appear to result in long-term hypersensitivity of the cough reflex arc.
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Affiliation(s)
| | - Heikki Koskela
- Unit for Medicine and Clinical Research, Pulmonary Division, Kuopio University Hospital, Kuopio, Pohjois-Savo, Finland
- Institute of Clinical Sciences, Faculty of Health Sciences, University of Eastern Finland School of Medicine, Kuopio, Pohjois-Savo, Finland
| | - Jussi Karjalainen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Allergy Centre, Tampere University Hospital, Tampere, Pirkanmaa, Finland
| | - Jari Parkkari
- Tampere Research Center of Sports Medicine, UKK Institute, Tampere, Pirkanmaa, Finland
- Faculty of Sport and Health Sciences, University of Jyväskylä, Jyvaskyla, Finland
| | - Heini Huhtala
- Faculty of Social Sciences, Tampere University, Tampere, Pirkanmaa, Finland
| | - Maarit Valtonen
- Finnish Institute of High Performance Sport KIHU, Jyväskylä, Finland
| | - Lauri Lehtimäki
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Allergy Centre, Tampere University Hospital, Tampere, Pirkanmaa, Finland
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Carlsson T, Wedholm L, Fjordell W, Swarén M, Carlsson M. Effect of sub-technique transitions on energy expenditure and physiological load in the classical-style technique among elite male cross-country skiers. Eur J Appl Physiol 2021; 121:3201-3209. [PMID: 34402986 PMCID: PMC8505378 DOI: 10.1007/s00421-021-04783-5] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 08/07/2021] [Indexed: 12/03/2022]
Abstract
Purpose To investigate whether sub-technique transitions in the classical-style technique are associated with increased energy expenditure and/or metabolic stress among elite male cross-country skiers. Methods Fifteen elite male skiers completed three 10-min treadmill roller-skiing tests, each of which consisted of 5 min using the diagonal-stride technique (DS) and 5 min using the double-poling technique (DP), combined in three various modes all ensuring comparable mechanical workload, at an inclination of 2.5° and a speed of 13 km/h. In the first and third tests, the participants used 5 min continuous DS followed by 5 min continuous DP, or vice versa (no transition (NT) test), whereas in the second test, they made transitions between DS and DP every 6 s (repeated transition (RT) test). The last 3 min of each 5-min stage was used to calculate the mean values of oxygen uptake (\documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text{V}}\text{O}}_{{2}}$$\end{document}V˙O2), respiratory exchange ratio (RER), metabolic rate (MR), mechanical work rate (MWR), and gross efficiency (GE). In addition, the pre–post-difference in blood lactate concentration (Ladiff) was determined for each test. Paired-samples t tests were used to investigate differences between tests. Results There were no significant differences between NT and RT tests regarding V̇O2, MR, MWR, or GE. Conversely, significant differences were found in RER and Ladiff, where the NT test was associated with higher RER and Ladiff values. Conclusions Roller skiing with repeated sub-technique transitions is not associated with an additional aerobic energy contribution; instead, the anaerobic energy contribution was lower compared to that under continuous use of DS and DP.
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Affiliation(s)
- Tomas Carlsson
- School of Education, Health and Social Studies, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden. .,Swedish Unit for Metrology in Sports, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden.
| | - Lars Wedholm
- School of Education, Health and Social Studies, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden
| | - Wilma Fjordell
- School of Education, Health and Social Studies, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden
| | - Mikael Swarén
- School of Education, Health and Social Studies, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden.,Swedish Unit for Metrology in Sports, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden
| | - Magnus Carlsson
- School of Education, Health and Social Studies, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden.,Swedish Unit for Metrology in Sports, Dalarna University, Högskolegatan 2, 791 88, Falun, Sweden
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Andersson EP, Hämberg I, Do Nascimento Salvador PC, McGawley K. Physiological responses and cycle characteristics during double-poling versus diagonal-stride roller-skiing in junior cross-country skiers. Eur J Appl Physiol 2021; 121:2229-41. [PMID: 33893836 DOI: 10.1007/s00421-021-04689-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 04/12/2021] [Indexed: 12/25/2022]
Abstract
Purpose This study aimed to compare physiological factors and cycle characteristics during cross-country (XC) roller-skiing at matched inclines and speeds using the double-poling (DP) and diagonal-stride (DS) sub-techniques in junior female and male XC skiers. Methods Twenty-three well-trained junior XC skiers (11 women, 12 men; age 18.2 ± 1.2 yr.) completed two treadmill roller-skiing tests in a randomized order using either DP or DS. The exercise protocols were identical and included a 5 min warm-up, 4 × 5 min submaximal stages, and an incremental test to exhaustion, all performed at a 5° incline. Results No significant three-way interactions were observed between sex, submaximal exercise intensity, and sub-technique. For the pooled sample, higher values were observed for DP versus DS during submaximal exercise for the mean oxygen uptake kinetics response time (33%), energy cost (18%), heart rate (HR) (9%), blood lactate concentration (5.1 versus 2.1 mmol·L−1), rating of perceived exertion (12%), and cycle rate (25%), while cycle length was lower (19%) (all P < 0.001). During the time-to-exhaustion (TTE) test, peak oxygen uptake (\documentclass[12pt]{minimal}
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\begin{document}$$\dot{V}$$\end{document}V˙O2peak), peak HR, and peak oxygen pulse were 8%, 2%, and 6% lower, respectively, for DP than DS, with a 29% shorter TTE during DP (pooled data, all P < 0.001). Conclusion In well-trained junior XC skiers, DP was found to exert a greater physiological load than DS during uphill XC roller-skiing at submaximal intensities. During the TTE test, both female and male athletes were able to ski for longer and reached markedly higher \documentclass[12pt]{minimal}
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\begin{document}$$\dot{V}$$\end{document}V˙O2peak values when using DS compared to DP.
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Tutt AS, Persson H, Andersson EP, Ainegren M, Stenfors N, Hanstock HG. A heat and moisture-exchanging mask impairs self-paced maximal running performance in a sub-zero environment. Eur J Appl Physiol 2021; 121:1979-92. [PMID: 33782715 DOI: 10.1007/s00421-021-04666-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 03/16/2021] [Indexed: 12/05/2022]
Abstract
Purpose Heat-and-moisture-exchanging devices (HME) are commonly used by endurance athletes during training in sub-zero environments, but their effects on performance are unknown. We investigated the influence of HME usage on running performance at − 15 °C. Methods Twenty-three healthy adults (15 male, 8 female; age 18–53 years; \documentclass[12pt]{minimal}
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\begin{document}$$\dot{V}{\text O}_{2peak}$$\end{document}V˙O2peak men 56 ± 7, women 50 ± 4 mL·kg−1·min−1) performed two treadmill exercise tests with and without a mask-style HME in a randomised, crossover design. Participants performed a 30-min submaximal warm-up (SUB), followed by a 4-min maximal, self-paced running time-trial (TT). Heart rate (HR), respiratory frequency (fR), and thoracic area skin temperature (Tsk) were monitored using a chest-strap device; muscle oxygenation (SmO2) and deoxyhaemoglobin concentration ([HHb]) were derived from near-infra-red-spectroscopy sensors on m. vastus lateralis; blood lactate was measured 2 min before and after the TT. Results HME usage reduced distance covered in the TT by 1.4%, despite similar perceived exertion, HR, fR, and lactate accumulation. The magnitude of the negative effect of the HME on performance was positively associated with body mass (r2 = 0.22). SmO2 and [HHb] were 3.1% lower and 0.35 arb. unit higher, respectively, during the TT with HME, and Tsk was 0.66 °C higher during the HME TT in men. HR (+ 2.7 beats·min−1) and Tsk (+ 0.34 °C) were higher during SUB with HME. In the male participants, SmO2 was 3.8% lower and [HHb] 0.42 arb. unit higher during SUB with HME. Conclusion Our findings suggest that HME usage impairs maximal running performance and increases the physiological demands of submaximal exercise.
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Losnegard T, Tosterud OK, Trøen E, Carlsen CH, Paulsen G, Rud B. The influence of pole lengths on O 2-cost, kinematics, and performance in double poling at high speeds before and after a training period with long poles. Eur J Appl Physiol 2019; 119:2579-2587. [PMID: 31565754 PMCID: PMC6858469 DOI: 10.1007/s00421-019-04237-z] [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: 04/13/2019] [Revised: 09/18/2019] [Accepted: 09/23/2019] [Indexed: 11/29/2022]
Abstract
PURPOSE Previous studies have found an acute performance improvement with longer pole lengths in double poling (DP) at low-to-moderate speeds. We investigated the influence of pole lengths (PL) on O2-cost, 3D kinematics, and performance in DP at moderate-to-high speeds before (Pre) and after (Post) eight training sessions with long poles on a rollerski treadmill. METHODS Seven male and four female skiers completed tests with two different PLs (84 and 90% of body height). Submaximal O2-cost (1º; 4.5 [females] or 6 m s-1 [males]) and a peak velocity test (1º; ∼ 7.3 m s-1) were assessed before and after a six week training period. The training sessions consisted of 50 min of low-moderate intensity training and 4 × 10 s maximal sprints with PL90%. RESULTS On average for all tests, PL84% induced 1.0 ± 1.0% higher peak velocity compared to PL90% (mean ± CI) with no difference in vertical displacement of center of mass (COMz). From Pre to Post, peak velocity and cycle time were increased and the displacement of COMz were reduced similarly for both PLs. At moderate speed, PL90% induced less displacement of COMz with subsequent 1.1 ± 0.7% lower O2-cost compared to PL84%. From Pre to Post, the O2-cost and COMz were reduced similarly for both PLs. CONCLUSIONS Longer PL than skiers self-selected lengths reduce O2-cost at moderate speeds, but induced lower peak velocity. Eight sessions of training with PL90% did not influence the difference between PL84% and PL90% on O2-cost, kinematics or peak velocity.
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Affiliation(s)
- Thomas Losnegard
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway.
| | - Ola Kristoffer Tosterud
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway
| | - Erik Trøen
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway
| | - Camilla Høivik Carlsen
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway
| | - Gøran Paulsen
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway.,The Norwegian Olympic and Paralympic Committee and Confederation of Sports, Oslo, Norway
| | - Bjarne Rud
- Department of Physical Performance, The Norwegian School of Sport Sciences, Ullevål Stadion, Post box 4014, 0806, Oslo, Norway
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Ettema G, Øksnes M, Kveli E, Sandbakk Ø. The effect of exhaustive exercise on the choice of technique and physiological response in classical roller skiing. Eur J Appl Physiol 2018; 118:2385-2392. [PMID: 30105640 DOI: 10.1007/s00421-018-3965-1] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 08/07/2018] [Indexed: 11/26/2022]
Abstract
PURPOSE The aim of this study was to investigate the effect of exhaustive exercise on technique preference and the accompanying physiological response during classic skiing at constant workload, but with varying incline-speed combinations. METHODS Seven male competitive cross-country skiers performed four tests, each lasting 23 min, at constant 200 W workload roller skiing on a treadmill using classic style, three in unfatigued state, and one after exhaustion. The incline and speed combination (that determined the 200 W) were altered each minute during the tests. The athletes were allowed to change sub-technique at free will. Physiological variables and cycle rate were recorded continuously as well as the incline-speed combinations at which the sub-technique was changed. RESULTS Exhaustive exercise did not (or hardly) affect cycle rate and choice of technique. The physiological response was most prominent in slight incline-high speed conditions, independent of exercise duration. Exhaustive exercise affected the physiological response in a differentiated manner. HR and RER remained, respectively, higher and lower after fatigue, while [Formula: see text] (and thereby GE) were affected only during approximately the first 8 min of post-exhaustion exercise. CONCLUSIONS Exhaustive exercise has a minimal effect on choice of technique in classic cross-country skiing with free choice of sub-technique, even though physiological stress is increased.
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Affiliation(s)
- Gertjan Ettema
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7491, Trondheim, Norway.
| | - Magne Øksnes
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Espen Kveli
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Øyvind Sandbakk
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, 7491, Trondheim, Norway
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Carlsen CH, Rud B, Myklebust H, Losnegard T. Pole lengths influence O 2-cost during double poling in highly trained cross-country skiers. Eur J Appl Physiol 2018; 118:271-81. [PMID: 29196845 DOI: 10.1007/s00421-017-3767-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 11/20/2017] [Indexed: 11/10/2022]
Abstract
Purpose In elite cross-country skiing, double poling is used in different terrain. This study compared O2-cost and kinematics during double poling with four different pole lengths [self-selected (SS), SS − 5 cm, SS + 5 cm, SS + 10 cm] at Low versus Moderate incline. Methods Thirteen highly trained male cross-country skiers (mean ± SD 23 ± 3 years; 182 ± 4 cm; 77 ± 6 kg) completed eight submaximal trials with roller skis on a treadmill at two conditions: “Low incline” (1.7°; 4.5 m s−1) and “Moderate incline” (4.5°; 2.5 m s−1) with each of the four pole lengths. O2-cost and 3D body kinematics were assessed in each trial. Results In Low incline, SS + 10 cm induced a lower O2-cost than all the other pole lengths [P < 0.05; effect size (ES) 0.5–0.8], whereas no differences were found between the remaining pole lengths (P > 0.05; ES 0.2–0.4). In Moderate incline, significant differences between all pole lengths were found for O2-cost, with SS − 5 cm > SS > SS + 5 cm > SS + 10 cm (P < 0.05; ES 0.6–1.8). The relative differences in O2-cost between SS and the other pole lengths were greater in Moderate incline than Low incline (SS − 5 cm; 1.5%, ES 0.8, SS + 5 cm; 1.3%, ES 1.0, and SS + 10 cm; 1.9%, ES 1.0, all P < 0.05). No difference was found in cycle, poling or reposition times between pole lengths. However, at both conditions a smaller total vertical displacement of center of mass was observed with SS + 10 cm compared to the other pole lengths. Conclusion Increasing pole length from SS − 5 cm to SS + 10 cm during double poling induced lower O2-cost and this advantage was greater in Moderate compared to Low incline. Electronic supplementary material The online version of this article (10.1007/s00421-017-3767-x) contains supplementary material, which is available to authorized users.
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Ettema G, Kveli E, Øksnes M, Sandbakk Ø. The role of speed and incline in the spontaneous choice of technique in classical roller-skiing. Hum Mov Sci 2017; 55:100-107. [PMID: 28810170 DOI: 10.1016/j.humov.2017.08.004] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 11/28/2022]
Abstract
Cross-country skiers change technique depending on terrain (incline) and effort (work rate; speed at a particular incline or resistance). The literature is not unequivocal about the influence of incline or speed on the choice of technique, i.e., which of these act as a 'control parameter'. Identifying task related control parameters for spontaneous technique shifts assists elucidating which mechanisms are active for triggering technique transitions. The aim of this study was to investigate whether speed or incline acted as such control parameter for technique shifts during classic style roller skiing. In this study, we kept the exercise intensity constant while changing two potential control parameters (speed and incline). Thus, any effect of work rate was excluded. Eight male competitive cross-country skiers performed roller skiing on a treadmill while incline was altered from 3 to 11% and back to 3% each minute by 1% and speed changed accordingly to obtain a constant work rate. This protocol was performed at three submaximal work rates (170, 200, and 230W) to obtain various combinations of speed and incline. The athletes were free to choose their technique (double poling, double poling with kick and diagonal stride), which was identified using continuous phase analysis on the motion of the skis. Physiological response (heart rate, oxygen uptake) was recorded continuously. The incline seemed to affect choice of technique shift more than speed: the ANOVA for repeated measures on all work rates showed no significant effect of incline (p>0.2) and an effect for speed (p<0.001). No effect of protocol order (increasing versus decreasing incline) was found for transitions. The physiological response was lowest for conditions of steep incline-low speed and was affected by protocol order. Cycle rate was affected by incline only in the double poling technique. Possible mechanisms related to the triggering of technique transitions are discussed.
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Affiliation(s)
- Gertjan Ettema
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.
| | - Espen Kveli
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Magne Øksnes
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Øyvind Sandbakk
- Centre for Elite Sports Research, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
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Anderson PJ, Bovard RS, Murad MH, Beebe TJ, Wang Z. Health status and health behaviors among citizen endurance Nordic skiers in the United States. BMC Res Notes 2017; 10:305. [PMID: 28738884 DOI: 10.1186/s13104-017-2619-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 07/12/2017] [Indexed: 11/18/2022] Open
Abstract
Background More than two-thirds of Americans are overweight or obese (69%) placing them at high risk for a wide array of chronic diseases. Physical activity anchors most approaches to obesity prevention and weight management, but physical activity levels remain low in the general US population. As a group, citizen athletes who compete in Nordic skiing events such as the American Birkebeiner participate in fitness cultures that promote physical activity. Methods During October–November 2014, we emailed a 48 question online survey to 23,611 individuals who had participated in the American Birkebeiner ski event, the largest citizen ski race in North America. Descriptive statistics were used to summarize data. Binomial and student t test were used to compare binary and continuous outcomes to health behaviors of the US population. Results 5433 individuals responded. Obesity prevalence (BMI ≥30) was 3% and average BMI was 24. Skiers reported very good health (88%), higher fitness than peers (99%), freedom from depression (93%) low levels of smoking (3%), high consumption of fruits and vegetables, moderate alcohol use, and high levels of physical activity. Fifteen percent practiced all 4 healthy living characteristics known to reduce cardiovascular event risk. Conclusions As a group, citizen endurance Nordic skiers enjoy low levels of obesity, below average BMI, and report lifestyle behaviors known to decrease obesity, promote health, and reduce cardiovascular disease risk. Future research should explore hypotheses that explain how the fitness cultures surrounding citizen athletic events support weight loss, cardiovascular fitness, and healthy lifestyle habits.
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14
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Kim K, Panday SB, Shin IS, Kim JH, Kim HY, Yu GJ. Effect of prolonged racing on muscle activity and spatiotemporal variables: double-poling technique. J Phys Ther Sci 2017; 29:941-945. [PMID: 28603377 PMCID: PMC5462704 DOI: 10.1589/jpts.29.941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 11/22/2016] [Accepted: 01/24/2017] [Indexed: 11/24/2022] Open
Abstract
[Purpose] The purpose of this study was to examine the effect of a 40-minute race on
muscle activity and spatiotemporal cycle variables at four-time points during a 12-km
roller skiing test using the double-poling technique. [Subjects and Methods] Five elite
cross-country (XC) skiers on the Korean National reserve team participated in the study.
Part of a biathlon course that consisted of both flat land and slopes was selected, and
three measurements were recorded after every 4-km lap. Spatiotemporal variables, mean
frequency and mean amplitude of 6 muscles were the chosen computational parameters.
[Results] Significant differences were observed in cycle time and rate. The mean frequency
of the upper-body muscles exhibited declining trends, with statistically significant
differences for the triceps brachii. In addition, there were significant differences in
the mean amplitude of the tibialis anterior and gastrocnemius. The activity of the triceps
brachii, tibialis anterior, and gastrocnemius showed some degree of dependence on the
technique. [Conclusion] Training and race strategies that improve the function of elbow
extensors and ankle dorsiflexors are important in XC skiing; the application of roller-ski
training research to actual XC skiing competitions is needed.
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Affiliation(s)
- Kitae Kim
- Department of Physical Education, Seoul National University, Republic of Korea
| | - Siddhartha Bikram Panday
- Department of Physical Education, Seoul National University, Republic of Korea.,Department of Fitness Management, University of Suwon, Republic of Korea
| | - In-Sik Shin
- Department of Physical Education, Seoul National University, Republic of Korea
| | - Jin-Hae Kim
- Department of Physical Education, Korea National Sport University, Republic of Korea
| | - Hye-Young Kim
- Division of Liberal Arts and Science, Korea National Sport University, Republic of Korea
| | - Gwang-Jae Yu
- Department of Industrial and Systems Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea
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15
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Carlsson T, Wedholm L, Nilsson J, Carlsson M. The effects of strength training versus ski-ergometer training on double-poling capacity of elite junior cross-country skiers. Eur J Appl Physiol 2017; 117:1523-32. [PMID: 28597103 DOI: 10.1007/s00421-017-3621-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 04/22/2017] [Indexed: 10/28/2022]
Abstract
PURPOSE To compare the effects of strength training versus ski-ergometer training on double-poling gross efficiency (GE), maximal speed (V max), peak oxygen uptake ([Formula: see text]) for elite male and female junior cross-country skiers. METHODS Thirty-three elite junior cross-country skiers completed a 6-week training-intervention period with two additional 40-min training sessions per week. The participants were matched in pairs and within each pair randomly assigned to either a strength-training group (STR) or a ski-ergometer-training group (ERG). Before and after the intervention, the participants completed three treadmill roller-skiing tests to determine GE, V max, and [Formula: see text]. Mixed between-within subjects analysis of variance (ANOVA) was conducted to evaluate differences between and within groups. Paired samples t tests were used as post hoc tests to investigate within-group differences. RESULTS Both groups improved their V max and [Formula: see text] expressed absolutely (all P < 0.01). For the gender-specific sub-groups, it was found that the female skiers in both groups improved both V max and [Formula: see text] expressed absolutely (all P < 0.05), whereas the only within-group differences found for the men were improvements of V max in the STR group. No between-group differences were found for any of the investigated variables. CONCLUSIONS Physiological and performance-related variables of importance for skiers were improved for both training regimes. The results demonstrate that the female skiers' physiological adaptations to training, in general, were greater than those of the men. The magnitude of the physiological adaptations was similar for both training regimes.
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Moseby Berge H, Clarsen B. New data on illness in elite sport: are immediate flights home after competition a changeable risk factor? Br J Sports Med 2016; 50:772-3. [PMID: 27313234 DOI: 10.1136/bjsports-2016-096378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2016] [Indexed: 11/03/2022]
Affiliation(s)
- Hilde Moseby Berge
- The Norwegian Olympic Training Center (Olympiatoppen), Oslo, Norway Oslo Sports Trauma Research Center, Oslo, Norway
| | - Ben Clarsen
- The Norwegian Olympic Training Center (Olympiatoppen), Oslo, Norway Oslo Sports Trauma Research Center, Oslo, Norway
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17
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Göpfert C, Lindinger SJ, Ohtonen O, Rapp W, Müller E, Linnamo V. The effect of swinging the arms on muscle activation and production of leg force during ski skating at different skiing speeds. Hum Mov Sci 2016; 47:209-219. [PMID: 27031075 DOI: 10.1016/j.humov.2016.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 07/07/2015] [Revised: 03/17/2016] [Accepted: 03/17/2016] [Indexed: 11/16/2022]
Abstract
The study investigated the effects of arm swing during leg push-off in V2-alternate/G4 skating on neuromuscular activation and force production by the leg muscles. Nine skilled cross-country skiers performed V2-alternate skating without poles at moderate, high, and maximal speeds, both with free (SWING) and restricted arm swing (NOSWING). Maximal speed was 5% greater in SWING (P<0.01), while neuromuscular activation and produced forces did not differ between techniques. At both moderate and high speed the maximal (2% and 5%, respectively) and average (both 5%) vertical force and associated impulse (10% and 14%) were greater with SWING (all P<0.05). At high speed range of motion and angular velocity of knee flexion were 24% greater with SWING (both P<0.05), while average EMG of m. biceps femoris was 31% lower (all P<0.05) in SWING. In a similar manner, the average EMG of m. vastus medialis and m. biceps femoris were lower (17% and 32%, P<0.05) during the following knee extension. Thus, swinging the arms while performing V2-alternate can enhance both maximal speed and skiing economy at moderate and, in particularly, high speeds.
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Affiliation(s)
- Caroline Göpfert
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Salzburg, Austria; Sports Technology Unit, Department of Biology of Physical Activity, Neuromuscular Research Centre, University of Jyväskylä, Kidekuja 2, Snowpolis, 88610 Vuokatti, Finland.
| | - Stefan J Lindinger
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Salzburg, Austria.
| | - Olli Ohtonen
- Sports Technology Unit, Department of Biology of Physical Activity, Neuromuscular Research Centre, University of Jyväskylä, Kidekuja 2, Snowpolis, 88610 Vuokatti, Finland.
| | - Walter Rapp
- Department of Sport and Sport Science, University of Freiburg, Schwarzwaldstraße 175, 79117 Freiburg, Germany.
| | - Erich Müller
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Salzburg, Austria.
| | - Vesa Linnamo
- Sports Technology Unit, Department of Biology of Physical Activity, Neuromuscular Research Centre, University of Jyväskylä, Kidekuja 2, Snowpolis, 88610 Vuokatti, Finland.
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Stöggl T, Schwarzl C, Müller EE, Nagasaki M, Stöggl J, Scheiber P, Schönfelder M, Niebauer J. Effects of skiing on cardiorespiratory and metabolic responses in middle-aged subjects with increased cardiovascular risk. Int J Cardiol 2015; 203:618-20. [PMID: 26580342 DOI: 10.1016/j.ijcard.2015.11.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/04/2015] [Indexed: 10/22/2022]
Affiliation(s)
- Thomas Stöggl
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Austria
| | - Christoph Schwarzl
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Austria; University Institute of Sports Medicine, Prevention and Rehabilitation, Paracelsus Medical University, Salzburg, Austria
| | - Edith E Müller
- University Institute of Sports Medicine, Prevention and Rehabilitation, Paracelsus Medical University, Salzburg, Austria; Research Institute of Molecular Sports Medicine and Rehabilitation, Paracelsus Medical University, Salzburg, Austria
| | - Masaru Nagasaki
- Department of Health Science, Faculty of Psychological and Physical Science, Aichi Gakuin University, 12 Araike, Iwasakicho, Nisshin, Aichi 470-0915, Japan
| | - Julia Stöggl
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Austria
| | - Peter Scheiber
- Department of Sport Science and Kinesiology, University of Salzburg, Schlossallee 49, 5400 Hallein/Rif, Austria
| | - Martin Schönfelder
- University Institute of Sports Medicine, Prevention and Rehabilitation, Paracelsus Medical University, Salzburg, Austria; Research Institute of Molecular Sports Medicine and Rehabilitation, Paracelsus Medical University, Salzburg, Austria
| | - Josef Niebauer
- University Institute of Sports Medicine, Prevention and Rehabilitation, Paracelsus Medical University, Salzburg, Austria; Research Institute of Molecular Sports Medicine and Rehabilitation, Paracelsus Medical University, Salzburg, Austria.
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Fasel B, Favre J, Chardonnens J, Gremion G, Aminian K. An inertial sensor-based system for spatio-temporal analysis in classic cross-country skiing diagonal technique. J Biomech 2015; 48:3199-205. [PMID: 26209087 DOI: 10.1016/j.jbiomech.2015.07.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The present study proposes a method based on ski fixed inertial sensors to automatically compute spatio-temporal parameters (phase durations, cycle speed and cycle length) for the diagonal stride in classical cross-country skiing. The proposed system was validated against a marker-based motion capture system during indoor treadmill skiing. Skiing movement of 10 junior to world-cup athletes was measured for four different conditions. The accuracy (i.e. median error) and precision (i.e. interquartile range of error) of the system was below 6 ms for cycle duration and ski thrust duration and below 35 ms for pole push duration. Cycle speed precision (accuracy) was below 0.1m/s (0.00 5m/s) and cycle length precision (accuracy) was below 0.15m (0.005 m). The system was sensitive to changes of conditions and was accurate enough to detect significant differences reported in previous studies. Since capture volume is not limited and setup is simple, the system would be well suited for outdoor measurements on snow.
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20
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Fabre N, Mourot L, Zoppirolli C, Andersson E, Willis SJ, Holmberg HC. Alterations in aerobic energy expenditure and neuromuscular function during a simulated cross-country skiathlon with the skating technique. Hum Mov Sci 2015; 40:326-40. [PMID: 25681656 DOI: 10.1016/j.humov.2015.01.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 01/18/2015] [Accepted: 01/22/2015] [Indexed: 11/17/2022]
Abstract
Here, we tested the hypothesis that aerobic energy expenditure (AEE) is higher during a simulated 6-km (2 loops of 3-km each) "skiathlon" than during skating only on a treadmill and attempted to link any such increase to biomechanical and neuromuscular responses. Six elite male cross-country skiers performed two pre-testing time-trials (TT) to determine their best performances and to choose an appropriate submaximal speed for collection of physiological, biomechanical and neuromuscular data during two experimental sessions (exp). Each skier used, in randomized order, either the classical (CL) or skating technique (SK) for the first 3-km loop, followed by transition to the skating technique for the second 3-km loop. Respiratory parameters were recorded continuously. The EMG activity of the triceps brachii (TBr) and vastus lateralis (VLa) muscles during isometric contractions performed when the skiers were stationary (i.e., just before the first loop, during the transition, and after the second loop); their corresponding activity during dynamic contractions; and pole and plantar forces during the second loop were recorded. During the second 3-km of the TT, skating speed was significantly higher for the SK-SK than CL-SK. During this second loop, AEE was also higher (+1.5%) for CL-SKexp than SK-SKexp, in association with higher VLa EMG activity during both isometric and dynamic contractions, despite no differences in plantar or pole forces, poling times or cycle rates. Although the underlying mechanism remains unclear, during a skiathlon, the transition between the sections of classical skiing and skating alters skating performance (i.e., skiing speed), AEE and neuromuscular function.
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Affiliation(s)
- Nicolas Fabre
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
| | - Laurent Mourot
- Research Unit EA4660, Culture Sport Health Society and Exercise Performance Health Innovation Platform, Franche-Comté University, Besançon, France; Clinical Investigation Centre, INSERM CIT 808, CHRU of Besançon, France
| | - Chiara Zoppirolli
- CeRiSM, Center of Research in Mountain Sport and Health, Department of Neurological, Neuropsychological, Morphological and Movement Sciences, University of Verona, Rovereto, Italy
| | - Erik Andersson
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Sarah J Willis
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
| | - Hans-Christer Holmberg
- Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden
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Sælen H, Ericson T. The recreational value of different winter conditions in Oslo forests: a choice experiment. J Environ Manage 2013; 131:426-434. [PMID: 24239810 DOI: 10.1016/j.jenvman.2013.10.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 10/02/2013] [Accepted: 10/07/2013] [Indexed: 06/02/2023]
Abstract
Cross-country skiing is important to many Norwegians as exercise and recreation during winter. The most heavily used areas for cross-country skiing are the forests near the capital city Oslo. Here, observed and predicted climate change lead to reduced snow days. A choice experiment estimates forest users' willingness to pay (WTP) for trips to the forest under different conditions: skiing conditions, bare ground, and wet snow not suitable for skiing. Snow conditions correlate with the highest WTP per trip, while the WTP for trips under bare conditions and wet snow is, respectively, 40 and 77% less. Expressed in terms of distance, the analysis indicates that the maximum willingness to travel (WTT) for the average trip is 45 km (each direction) for snow, 23 km for bare ground, while not significantly different from zero for wet snow. The large difference in value across different conditions suggests that climate change may reduce the recreational value for forest users considerably.
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Affiliation(s)
- Håkon Sælen
- CICERO - Center for International Climate and Environmental Research - Oslo, P.B. 1129 Blindern, 0318, Oslo, Norway.
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22
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Lamb PF, Bartlett R, Lindinger S, Kennedy G. Multi-dimensional coordination in cross-country skiing analyzed using self-organizing maps. Hum Mov Sci 2013; 33:54-69. [PMID: 24060219 DOI: 10.1016/j.humov.2013.08.005] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 08/02/2013] [Accepted: 08/02/2013] [Indexed: 01/05/2023]
Abstract
This study sought to ascertain how multi-dimensional coordination patterns changed with five poling speeds for 12 National Standard cross-country skiers during roller skiing on a treadmill. Self-organizing maps (SOMs), a type of artificial neural network, were used to map the multi-dimensional time series data on to a two-dimensional output grid. The trajectories of the best-matching nodes of the output were then used as a collective variable to train a second SOM to produce attractor diagrams and attractor surfaces to study coordination stability. Although four skiers had uni-modal basins of attraction that evolved gradually with changing speed, the other eight had two or three basins of attraction as poling speed changed. Two skiers showed bi-modal basins of attraction at some speeds, an example of degeneracy. What was most clearly evident was that different skiers showed different coordination dynamics for this skill as poling speed changed: inter-skier variability was the rule rather than an exception. The SOM analysis showed that coordination was much more variable in response to changing speeds compared to outcome variables such as poling frequency and cycle length.
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Affiliation(s)
- Peter F Lamb
- Faculty of Sports and Health Science, Technische Universität München, Munich, Germany.
| | - Roger Bartlett
- School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand
| | - Stefan Lindinger
- Department of Sport Science and Kinesiology, University of Salzburg, Salzburg, Austria
| | - Gavin Kennedy
- School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand
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