Fig. 3.

Individual values (average of 2 measurements) from the vastus lateralis muscle for unidirectional P_i→ATP flux (V_Pi→ATP) at baseline, 15 h after the first training session, and 15 h after the sixth training session. The 15-h data point for one participant (dashed line) is missing due to technical issues. Baseline V_Pi→ATP was not different from V_Pi→ATP at 15 h, or after 2 wk training (see Table 3), indicating that short-term, high-intensity interval training did not increase P_i→ATP flux in resting muscle.