Journal of Korean Physical Therapy Science (대한물리치료과학회지)

Korean Physical Therapy Science (대한물리치료과학회)
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Comparison of hamstring muscles activity between subjects with normal and shortened hamstring muscle during plank exercise

  • Choi, Bo ram (Dept. of Physical Therapy, College of health and welfare, Silla University)
  • Received : 2021.10.04
  • Accepted : 2021.12.01
  • Published : 2022.06.30
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Abstract

Background: Plank exercise (PE) is an effective exercise to enhance lower back stability by strengthening the core and lower limb muscles. However, in patients with a shortened hamstring muscle (HAM), PE may cause abnormal movement of the pelvis and lower back due to HAM hyperactivity. Therefore, the objective of this study was to investigate the effects of PE on the core muscles and HAM in subjects with a shortened HAM. Design: Cross-sectional study. Methods: Subjects were divided into a normal length of HAM group (NHG; 9 subjects) and a shortened length of HAM group (SHG; 14 subjects). The activities of the erector spinae (ES), rectus abdominis (RA), external oblique (EO), and HAM muscles were measured using surface electromyography. Results: The results showed that RA, EO, and ES muscle activities were higher in the NHG than in the SHG; however, no significant differences were detected. Conclusion: HAM activity was significantly higher in the SHG than in the NHG. In subjects with a shortened HAM, PE may hyperactivate the HAM, adversely affecting the pelvis and lower back.

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