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J Phys Ther Sci. 2015 May;27(5):1491-4. doi: 10.1589/jpts.27.1491. Epub 2015 May 26.

Comparison of isokinetic muscle strength and muscle power by types of warm-up.

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Department of Physical Education, Kunsan National University, Republic of Korea.
Department of Sports Medicine, Graduate School of Sports Science, Dankook University, Republic of Korea.
Department of Health Management, Sahmyook University, Republic of Korea.


[Purpose] The purpose of this study was to clarify the influence of static stretching at warm-up on the isokinetic muscle torque (at 60°/sec) and muscle power (at 180°/sec) of the flexor muscle and extensor muscle of the knee joint. [Subjects and Methods] The subjects of this study were 10 healthy students with no medically specific findings. The warm-up group and warm-up with stretching group performed their respective warm-up prior to the isokinetic muscle torque evaluation of the knee joint. One-way ANOVA was performed by randomized block design for each variable. [Results] The results were as follows: First, the flexor peak torque and extensor peak torque of the knee joint tended to decrease at 60°/sec in the warm-up with stretching group compared with the control group and warm-up group, but without statistical significance. Second, extensor power at 180°/sec was also not statistically significant. However, it was found that flexor power increased significantly in the warm-up with stretching group at 180°/sec compared with the control group and warm-up group in which stretching was not performed. [Conclusion] Therefore, it is considered that in healthy adults, warm-up including two sets of stretching for 20 seconds per muscle group does not decrease muscle strength and muscle power.


Muscle power; Stretching; Warm-up

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