Abstract

BOHAJAR-LAX, Álvaro; VAQUERO-CRISTOBAL, Raquel; ESPEJO-ANTUNEZ, Luis  and  LOPEZ-MINARRO, Pedro Ángel. The effect of a hamstring streching protocol on hamstring extensibiity in adolescent students: influence of the class session weekly distribution. Nutr. Hosp. [online]. 2015, vol.32, n.3, pp.1241-1245. ISSN 1699-5198.  https://dx.doi.org/10.3305/nh.2015.32.3.9308.

Introduction: students who do hamstring stretching exercises, twice per week on alternate days, have showed significant increases on extensibility. Objetive: to compare the effects of a hamstring stretching program includes in the physical education classes in booth groups of adolescent, which had a different class session weekly distribution (non-consecutive sessions vs. consecutive sessions). Method: fifty-eight adolescent students did a static-active stretching program on hamstring in the warm-up of both weekly physical education sessions for five weeks. The total duration of the stretching was five minutes. Students were divided in two groups: group A, with 30 students, had consecutive sessions (monday-tuesday), and the group B, with 29 students, had non-consecutive sessions (tuesday-friday). Hamstring extensibility was evaluated with the sit-and-reach test before (pre-test) and after (post-test) the intervention program. Results and discussion: there was found a significant increase in the sit-and-reach score in the group A (+2,15 cm) (p = 0.003) and in the group B (+2,31 cm) (p < 0.001). No significant differences were found between groups in the pre-test and the post-test (p > 0.05). Conclusions: the implementation of an intervention program for five weeks, twice sessions a week, induded increases on hamstring extensibility in students. The class session weekly distribution does not affect the results.

Keywords : Exercise; Flexibility; Muscle stretching exercises; Physical education; Schools.

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