Figure 5. Time course of changes in the ratio of P100 (muscle contraction force evoked by stimulating the quadriceps muscle at 100-Hz frequency) at long to short muscle length during and after stretch-shortening exercise of 100 drop jumps every 30 seconds. Measurements were taken after 10 (minute 5), 50 (minute 25), and 100 (minute 50) drop jumps and during recovery at 1, 4, 8, 24, 48, and 72 hours after performing 100 jumps. C indicates control condition without muscle prewarming; W, condition with muscle prewarming. ^a Indicates P < .05 between pre-exercise (Pre) and postexercise levels; ^b P < .05 between conditions C and W.