Japanese Journal of Health Promotion and Physical Therapy
Online ISSN : 2187-3305
Print ISSN : 2186-3741
ISSN-L : 2186-3741
CASE REPORT
The role of the serratus posterior inferior muscle evaluated with electromyography: A case report
A case report
NAOKI NAKAMURAKAZUYA ITOKAZUYOSHI GAMADAKANJI AKIYAMA
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JOURNALS FREE ACCESS

2015 Volume 5 Issue 2 Pages 91-95

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Abstract

PURPOSE: “Chest gripping”is an abnormal trunk muscle activation pattern limiting lateral expansion of the lower thorax, which may reduce thoracic extension or even cause low back pain (LBP). Hypertonic upper abdominal muscles may be a cause. The serratus posterior inferior (SPI) is considered an only antagonist to the chest gripping. TheaimofthisstudywastodetermineaneffectiveexercisetoactivatetheSPI. SUBJECTS: A healthy male volunteer was recruited. METHODS: Activities of the 3 trunk muscles during 8 maximal exertion tasks and normalized surface-electromyography values were obtained. The wire electrodeandthesurface electrode were used for the measurement. RESULTS: The SPI were effectively recruited during active trunk rotation at end sitting and side lying, ipsilateral shoulder hyper-flexion compensated with trunk rotation from the all-fourʼs position. CONCLUSION: The SPI has an effect to which it carries out the rotation of the trunk by one-side activity. Therefore, it is surmised that SPI has the effect that pulls an ipsilaterally lower ribs back.

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© 2015 Japan Society of Health Promotion and Physical Therapy
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