Fig. 3. Group 3, trains-of-four repeated at 15-s intervals. Immediately preceding (< 1 min) instrument calibration at time 0, the subject received a supramaximal 50-Hz tetanic stimulus of 5 seconds’ duration. Unconnected gray dots represent individual data points from 10 subjects. The solid black points represent the average values for the group. Twitch height (T1) averaged 101% of control at 5 min, 104% at 10 min, and 105% at 22.5 min. Note that the scale of the y-axis in figures 1 and 3are not identical.