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Using bilateral functional and anthropometric tests to define symmetry in cross-country skiers
Mid Sweden University;Swedish Sports Confederation.
Linnaeus University, Faculty of Social Sciences, Department of Sport Science. Mid Sweden University.ORCID iD: 0000-0001-6653-3414
Mid Sweden University;University of Gothenburg.
2017 (English)In: Journal of Human Kinetics, ISSN 1640-5544, E-ISSN 1899-7562, Vol. 60, no 1, p. 9-18Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate the symmetry of anthropometry and muscle function in cross-country skiers and their association to vertical jumping power. Twenty cross-country skiers were recruited (21.7 ± 3.8 yrs, 180.6 ± 7.6 cm, 73.2 ± 7.6 kg). Anthropometric data was obtained using an iDXA scan. VO2max was determined using the diagonal stride technique on a ski treadmill. Bilateral functional tests for the upper and lower body were the handgrip and standing heel-rise tests. Vertical jump height and power were assessed with a counter movement jump. Percent asymmetry was calculated using a symmetry index and four absolute symmetry index levels. At a group level the upper body was more asymmetrical with regard to lean muscle mass (p = 0.022, d = 0.17) and functional strength (p = 0.019, d = 0.51) than the lower body. At an individual level the expected frequencies for absolute symmetry level indexes showed the largest deviation from zero for the heel-rise test (χ2 = 16.97, p = 0.001), while the leg lean mass deviated the least (χ2 = 0.42, p = 0.517). No relationships were observed between absolute symmetry level indexes of the lower body and counter movement jump performance (p > 0.05). As a group the skiers display a more asymmetrical upper body than lower body regarding muscle mass and strength. Interestingly at the individual level, despite symmetrical lean leg muscle mass the heel-rise test showed the largest asymmetry. This finding indicates a mismatch in muscle function for the lower body.

Place, publisher, year, edition, pages
De Gruyter Open, 2017. Vol. 60, no 1, p. 9-18
Keyword [en]
Physical fitness, Body composition, Hand strength, Sport and Fitness Sciences, Idrottsvetenskap
National Category
Sport and Fitness Sciences
Research subject
Social Sciences, Sport Science
Identifiers
URN: urn:nbn:se:lnu:diva-69093DOI: 10.1515/hukin-2017-0107ISI: 000418922200002OAI: oai:DiVA.org:lnu-69093DiVA: diva2:1162918
Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2018-01-12Bibliographically approved

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Alricsson, Marie

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