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Comparison of the Foot Muscle EMG and Medial Longitudinal Arch Angle During Short Foot Exercises at Different Ankle Position KCI 등재

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한국전문물리치료학회지 (Physical Therapy Korea)
한국전문물리치료학회 (Korean Research Society of Physical Therapy)
초록

Background: The MLA is supported by both the abductor hallucis (ABH) and the extrinsic muscles. Insufficient muscular support may lower the MLA when the body’s weight is applied to the foot. The short foot exercise (SFE) is effective in increasing the height of the MLA for people with flat feet. Most of the research related to the SFE has simply evaluated the efficiency of the exercise using enhanced ABH electromyography (EMG) activation. Since the tibialis anterior (TA), peroneus longus (PER), and ABH are all involved in supporting the MLA, a new experiment design examining the EMG of the selected muscles during SFE should be applied to clarify its effect. Objects: Therefore, this study aimed to clarify the effect of the SFE in different ankle position on the MLA angle and the activation of both the intrinsic and extrinsic muscles and to determine the optimal position. Methods: 20 healthy subjects and 12 subjects with flat feet were recruited from Yonsei University. The surface EMG and camera were used to collect muscle activation amplitude of TA, PER, and ABH and to capture the image of MLA angle during SFE. The subjects performed the SFE while sitting in three different ankle positions—neutral (N), dorsiflexion (DF) at 30 degrees, and plantar flexion (PF) at 30 degrees. Results: ABH EMG amplitudes were significantly greater in N and DF than in PF (p<.05). Muscle activation ratio of TA to ABH was the lowest in PF (p<.05). MLA angle in both groups significantly decreased in PF (p<.01). The TA and ABH was activated at the highest level in DF. However, in PF, subjects significantly activated the ABH and PER with relatively low activation of TA. Conclusion: Therefore, researchers need to discuss which SFE condition most effectively use the arch support muscle for flat foot.

목차
Introduction
 Methods
  Subjects
  Instrumentation
  Procedure
  Statistical Analysis
 Results
  Muscle activation
  Muscle activation ratio
  MLA angle
 Discussion
 Conclusion
 References
저자
  • Hyeo-bin Yoon(Department of Physical Therapy, The Graduate School, Yonsei University)
  • Ji-hyun Kim(Department of Physical Therapy, The Graduate School, Yonsei University)
  • Joo-hee Park(Department of Physical Therapy, The Graduate School, Yonsei University)
  • Hye-seon Jeon(Department of Physical Therapy, College of Health Science, Yonsei University, Department of Ergonomic Therapy, The Graduate School of Health Science, Yonsei University) Corresponding author