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O 2 extraction in the arms and legs during the first and second sessions of diagonal stride skiing and the intervening double poling at 90% VO 2max/peak . The values presented are as means ± SD. The P-values, effect size (pη2), and observed power obtained with the two-way ANOVA (skiing technique × extremity) are presented. ***P < 0.001 in comparison to DP and ††† P < 0.001 in comparison to the arms.
