Fig. 2.

Original recordings of the forces applied against the ergometer (A and C), and EMG (B and D) obtained during constant-load knee extension trials performed at the 0.6 and 0.3 duty cycle conditions. In these trials, the average forces were similar; however, the time to failure differed by nearly 4 min (20 vs. 253 s) in the 0.6 vs. 0.3 conditions, respectively. Gray (total movement cycle) and black (muscle activity) bars indicate the durations of muscle activity vs. inactivity created by the experimental manipulation.