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. 2014 Feb;26(2):209-13.
doi: 10.1589/jpts.26.209. Epub 2014 Feb 28.

Effects on hamstring muscle extensibility, muscle activity, and balance of different stretching techniques

Kyoung-Il Lim  1 , Hyung-Chun Nam  1 , Kyoung-Sim Jung  1
Affiliations

Effects on hamstring muscle extensibility, muscle activity, and balance of different stretching techniques

Kyoung-Il Lim et al. J Phys Ther Sci. 2014 Feb.

Abstract

[Purpose] The purpose of this study was to investigate the effects of two different stretching techniques on range of motion (ROM), muscle activation, and balance. [Subjects] For the present study, 48 adults with hamstring muscle tightness were recruited and randomly divided into three groups: a static stretching group (n=16), a PNF stretching group (n=16), a control group (n=16). [Methods] Both of the stretching techniques were applied to the hamstring once. Active knee extension angle, muscle activation during maximum voluntary isometric contraction (MVC), and static balance were measured before and after the application of each stretching technique. [Results] Both the static stretching and the PNF stretching groups showed significant increases in knee extension angle compared to the control group. However, there were no significant differences in muscle activation or balance between the groups. [Conclusion] Static stretching and PNF stretching techniques improved ROM without decrease in muscle activation, but neither of them exerted statistically significant effects on balance.

Keywords: Balance; Muscle activation; Stretching.

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