Figure 3.

Group mean peak quadriceps twitch force (Q_tw,peak) and the force of the second twitch (Q_tw,T2) in response to supramaximal stimuli at 1 Hz (single twitch), 10 Hz (100 ms interstimulus duration), 50 Hz (20 ms) and 100 Hz (10 ms) pre- and up to 70 min postexercise for CTRL (A and B) and IRL-CTRL (C and D). Exercise was 292 ± 13 W for 13.2 ± 0.9 min in CTRL and 292 ± 13 W for 7.9 ± 0.6 min in IRL-CTRL. In CTRL, the Q_tw,_peak response was significantly reduced at all frequencies and times after exercise; immediately postexercise the Q_tw,T2 response was significantly reduced at all stimulation frequencies; at 35 min postexercise the Q_tw,T2 response at 10 Hz was less than at 50 and 100 Hz. In IRL-CTRL, Q_tw,T2 (mean for all frequencies) was reduced immediately after versus before exercise. n = 8 per group. Values are mean ±s.e.m.