The Effect of Rest Time After Stretching on Vertical Jump Height
Dr. Kevin Cole
The exact effects of stretching on power production are uncertain. This uncertainty could be due to a lack of control for rest time after stretching before performance. The purpose of this study was to determine the relationship between rest time after stretching and its effect on power production in recreationally active college students. A total of 17 participants volunteered for this study. Each participant performed the same stretch protocol including static and dynamic stretches after jogging for 5-minutes to warm up. Subjects were randomly assigned to groups for different rest intervals before vertical jump (0, 5, 15, 30). In following testing sessions, participants performed the remaining rest intervals until they had performed all four of them. After stretching and allotted rest time, participants jumped three countermovement jumps using the Vertec Apparatus. The highest of the three jump values was their final value. The results were analyzed using a pairwise comparisons test. Mean values were 15.03 inches +/- 4.50 (prestretching), 16.68 inches +/- 4.82 (0 minutes rest), 16.38 inches +/- 4.75 (5 minutes rest), 16.44 inches +/- 4.90 (15 minutes rest), and 15.41 inches +/- 3.46 (30 minutes rest). Significant differences were seen in vertical jump performance when comparing the pre-test data to the 0-minute rest condition (p=0.002), 5-minute rest condition (p=0.021), and 15-minute rest condition (p=0.012). Significant differences were also seen when comparing the 0-minute rest condition with the 30-minute rest condition (p=0.019). This data shows that our stretching protocol enhanced vertical jump height at 0, 5, and 15 minutes rest. There was also a significant drop in jump height from 0 to 30 minutes, indicating that the beneficial effects of stretching wore off sometime between 15 and 30 minutes rest.
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