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Effects of Heel-insole on Static Balance and Postural Strategy during External Perturbation in Healthy Young Men

대한물리치료학회지 2021년 33권 1호 p.1 ~ 6
강철진, 오덕원, 손성민,
소속 상세정보
강철진 ( Kang Cheol-Jin ) - Cheongju University Graduate School of Health Sciences Department of Physical Therapy
오덕원 ( Oh Duck-Won ) - Cheongju University College of Health Science Department of Physical Therapy
손성민 ( Son Sung-Min ) - Cheongju University College of Health Science Department of Physical Therapy

Abstract


Purpose: This study examined the effects of heel insoles on the static balance and leg muscle activity and posture control strategy during external perturbation.

Methods: Thirty healthy young men participated in the study. The subjects underwent two experimental conditions: 1) no heel insole condition (0cm) and 2) wearing heel insole condition (5cm). The static balance was measured using an I-Balance device, which measured the change in the center of gravity (COG). The onset time of muscle activation and muscle activation of the erector spinae (ES), hamstring (HAM), gastrocnemius (GCM) were measured using surface EMG electrodes to determine the change in posture control strategy during external perturbation.

Results: The speed and distance of COG were significantly higher in the wearing heel insoles condition than the no heel insole condition (p<0.05). In addition, significant differences in the onset time of the GCM, HAM, and ES muscle activation were observed when there was no heel insole condition during external perturbation (p<0.017). On the other hand, no significant differences in the onset time of muscle activation were observed between GCM and HAM when wearing the heel insole condition during external perturbation (p<0.017). Moreover, muscle activation of the GCM was significantly higher in the wearing heel insoles condition than the no heel insole condition during external perturbation (p<0.05).

Conclusion: These findings suggest that heel insoles may have disadvantages, and increased efforts are needed to
maintain balance and change the posture control strategy during external perturbation.

키워드

Heel insole; Balance; Posture control strategy

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