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Individual data illustrating the effects of constant-load bike exercise (138 ± 14 W; 10.6 ± 0.7 min) on potentiated quadriceps twitch force (Qtw,pot; top) and voluntary muscle activation (VA; bottom) at sea level [SL; resting arterial oxygen (O2) content: 19.3 ± 0.7 ml O2/dl] and in AH (17.3 ± 0.5 ml O2/dl) and chronic hypoxia (CH; 20.3 ± 1.3 ml O2/dl).
