Background: Short foot exercise (SFex) is often prescribed and performed in the sport and rehabilitation fields to strengthen intrinsic foot muscles. However, SFex is difficult to perform because of lack of feedback methods. Objects: The aim of this study was to compare the effects of SFex with and without electromyography (EMG) biofeedback on the medial longitudinal arch (MLA) of healthy individuals who maintained a static standing position. Methods: All participants (14 males and 12 females) were randomly divided into two groups (biofeedback and non-biofeedback groups). The EMG activity of the abductor hallucis (AbdH) and tibialis anterior (TA) and the MLA angle on the dominant leg side were measured with the participant in the standing position in the pre- and post-intervention conditions. The intervention session consisted of 15 minutes of SFex with (biofeedback group) or without (non-biofeedback group) EMG biofeedback. The groups were compared using two-way repeated measures analysis of variance. Results: The post-intervention activities of the AbdH muscle (p<.05) and the AbdH/TA ratio (p<.05) were significantly greater in the biofeedback group than in the non-biofeedback group. The activity of the TA (p<.05) and the MLA angle (p<.05) in the biofeedback group were significantly lower in the post-intervention condition than in the pre-intervention condition. Conclusion: The present findings demonstrate that the combination of SFex and EMG biofeedback can effectively facilitate the muscle activity of the AbdH and strengthen the medial longitudinal arch.

2. Cha SM. Phys Ther Korea. 2017(1)9-18
 Abstract
 Ⅰ. 서론
 Ⅱ. 연구방법
  1. 연구 대상자
  2. 실험 기기 및 도구
  3. 실험 방법
  4. 분석방법
 Ⅲ. 결과
  1. 엄지벌림근 근활성도
  2. 앞정강근 근활성도
  3. 엄지벌림근/앞정강근 근활성도 비율
  4. 안쪽세로활 각도
 Ⅳ. 고찰
 Ⅴ. 결론
 References

• 차상민(인제대학교 대학원 물리치료학과, Dept. of Physical Therapy, The Graduate School, Inje University) | Sang-min Cha, BHSc, PT
• 강민혁(인제대학교 대학원 물리치료학과, Dept. of Physical Therapy, The Graduate School, Inje University) | Min-hyeok Kang, PhD, PT
• 문동철(김해대학교 물리치료과, Dept. of Physical Therapy, Gimhae College) | Dong-chul Moon, PhD, PT
• 오재섭(인제대학교 의생명공학대학 물리치료학과, Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University) | Jae-seop Oh, PhD, PT Corresponding author