Post-6 sets was significantly lower than Pre-6 sets (p < or = 0.05). After another rest period, a second set of vertical jump trials was performed. After a brief rest period, participants performed 3 trials of a vertical jump test, followed by one of the treatment protocols. Upon arrival, each subject performed a 5-minute warm-up on a stationary upright cycle. Stretches were done to the quadriceps, hamstrings, and plantar flexors. Stretching treatments consisted of 2, 4, or 6 sets of stretches, with each stretch held for 15 seconds with a 15-second rest. Ten collegiate athletes and 10 recreational athletes completed 3 different stretching treatments and 1 control treatment on different days in a within-treatment design. By systematically increasing the amount of stretching, possible differences in jump height may be discovered, defining a line where acute static stretching becomes detrimental to performance. Therefore, the purpose of the study was to examine the relationship between varying amounts of acute static stretching on jumping performance. Numerous studies have shown that stretching routines can induce strength and force deficits, although the amount of stretching needed to cause these deficits remains unclear.
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