Nelson, R. T., & Bandy, W. D. (2004). Eccentric training and static stretching improve hamstring flexibility of high school males. Journal of Athletic Training, 39,

This study determined if the flexibility of high-school-aged males would improve after a 6-week eccentric exercise program. In addition, the changes in hamstring flexibility that occurred after the eccentric program were compared with a 6-week program of static stretching and with a control group of no stretching. Ss (N = 69) were assigned randomly to one of three groups: eccentric training, static stretching, or control. Hamstring flexibility was measured using the passive 90/90 test before and after the 6-week program.

Both experimental groups improved similarly (~+12°) and were significantly different to the control group (+1.67°).

Implication. Eccentric and static stretching training improved hamstring flexibility similarly over a 6-week period.

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