Scaling of upper-body power output to predict time-trial roller skiing performance |
| |
| Authors: | Tomas Carlsson Magnus Carlsson Daniel Hammarström Christer Malm Michail Tonkonogi |
| |
| Institution: | 1. Dalarna University, Health and Social Sciences , Falun , Sweden;2. Ume? University, Sports Medicine , Ume? , Sweden tca@du.se;4. Ume? University, Sports Medicine , Ume? , Sweden;5. Dalarna University, Health and Social Sciences , Falun , Sweden;6. Ume? University, Sports Medicine , Ume? , Sweden;7. Winternet , Boden , Sweden;8. Olympiatoppen , Oslo , Norway |
| |
| Abstract: | Abstract 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 · W 0.556 · 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. |
| |
| Keywords: | cross-country skiing double-poling body mass testing |
|
|
