[Purpose] The purpose of this study was to analyze the effects of open and closed chain
exercise on the muscle strength and muscle activity of the ankle joint. [Subjects and
Methods] Twenty women in their 20s were randomly assigned to two groups: the open
kinetic-chain group and the closed kinetic-chain group. Each group performed 5 sets 3
times per week for 4 weeks. Exercise intensity was increased once after two weeks. The
muscle activity of the tibialis anterior, gastrocnemius, tibialis posterior, and peroneus
longus muscles were measured. The collected data were analyzed with two-way repeated
measures ANOVA. [Results] In the results for muscle strength, both groups showed
significant differences in dorsiflexion and plantar flexion between the pre-test and
post-test. In the results for muscle activity, no significant differences were noted for
either group. [Conclusion] Open and closed kinetic-chain exercises can help to improve
muscle strength.
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