Scaling of upper-body power output to predict time-trial roller skiing performance
2013 (English)In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 31, no 6, 582-588 p.Article in journal (Refereed) Published
The purpose of the present study was to establish the most appropriate allometric model to predict mean skiing speed during a double-poling roller skiing time-trial using scaling of upper-body power output. Forty-five Swedish junior cross-country skiers (27 men and 18 women) of national and international standard were examined. The skiers, who had a body mass (m) of 69.3 +/- 8.0 kg (mean +/- s), completed a 120-s double-poling test on a ski ergometer to determine their mean upper-body power output (W). Performance data were subsequently obtained from a 2-km time-trial, using the double-poling technique, to establish mean roller skiing speed. A proportional allometric model was used to predict skiing speed. The optimal model was found to be: Skiing speed = 1.057 · W0.556 · m-0.315, which explained 58.8% of the variance in mean skiing speed (P < 0.001). The 95% confidence intervals for the scaling factors ranged from 0.391 to 0.721 for W and from 0.626 to 0.004 for m. The results in this study suggest that allometric scaling of upper-body power output is preferable for the prediction of performance of junior cross-country skiers rather than absolute expression or simple ratio-standard scaling of upper-body power output.
Place, publisher, year, edition, pages
2013. Vol. 31, no 6, 582-588 p.
cross-country skiing, double-poling, body mass, testing
Sport and Fitness Sciences
IdentifiersURN: urn:nbn:se:umu:diva-68265DOI: 10.1080/02640414.2012.744079ISI: 000316216800002OAI: oai:DiVA.org:umu-68265DiVA: diva2:616729