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KMID : 1206220220290020014
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Journal of Korean Academy of Physical Therapy Science
2022 Volume.29 No. 2 p.14 ~ p.19
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Comparison of hamstring muscles activity between subjects with normal and shortened hamstring muscle during plank exercise
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Choi Bo-Ram
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Abstract
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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 low- er 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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KEYWORD
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Core muscles, Hamstring, Muscle short- ness, Muscle tightness, Plank exercise
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