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KMID : 1035420170050020043
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Journal of The Korean Society of Integrative Medicine
2017 Volume.5 No. 2 p.43 ~ p.50
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Effect of Ankle Position on Hallux Flexion Force and Muscles Activity of Abductor Hallucis
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Jung Do-Young
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Abstract
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Purpose : There is no validated method for measuring the toe flexor strength that can isolate the intrinsic muscles of the foot from the extrinsic muscles. This study compared the hallux flexion force (HFF) and muscle activity in the foot and ankle according to ankle position [plantarflexion (PF), neutral, and dorsiflexion (DF)].
Method : The study enrolled 17 subjects. In the sitting position, the HFF and activities of the abductor hallucis (AbdH), tibialis anterior (TA), and gastrocnemius (GCM) muscles were measured using a digital dynamometer and a wireless electromyography system, respectively. Subjects were instructed to flex the great toe maximally in three different ankle positions. Three 5-second trials were performed to measure the HFF and muscle activities in each condition. Repeated-measures ANOVA was used to compare the variables and paired t-tests with the Bonferroni correction were used for post-hoc pair-wise comparisons. The significance level was set at .016.
Result : The HFF in DF was significantly greater than in any other ankle position (p<.01). The TA activity was greatest in ankle DF and that of the GCM was greatest in PF (both p<.01). However, there was no significant difference in AbdH activity according to ankle position.
Conclusion : These results suggest that selective strength measurement of the foot intrinsic muscles in HFF should be performed with the ankle in the neutral position.
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KEYWORD
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abductor hallucis, elecromyography, foot intrinsic muscles, hallux flexion force
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