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J Electromyogr Kinesiol. 2016 Jun;28:76-81. doi: 10.1016/j.jelekin.2016.03.007. Epub 2016 Apr 4.

Surface electromyography activity of the rectus abdominis, internal oblique, and external oblique muscles during forced expiration in healthy adults.

Author information

1
Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka, Japan. Electronic address: itok@rehab.osakafu-u.ac.jp.
2
Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka, Japan.
3
Department of Physical Medicine and Rehabilitation, Kansai Electric Power Hospital, Osaka, Japan.
4
Department of Rehabilitation, Iwakuni Medical Center, Yamaguchi, Japan.
5
Faculty of Health Sciences, Kyoto Tachibana University, Kyoto, Japan.

Abstract

We aimed to characterize rectus abdominis, internal oblique, and external oblique muscle activity in healthy adults under expiratory resistance using surface electromyography. We randomly assigned 42 healthy adult subjects to 3 groups: 30%, 20%, and 10% maximal expiratory intraoral pressure (PEmax). After measuring 100% PEmax and muscle activity during 100% PEmax, the activity and maximum voluntary contraction of each muscle during the assigned experimental condition were measured. At 100% PEmax, the external oblique (p<0.01) and internal oblique (p<0.01) showed significantly elevated activity compared with the rectus abdominis muscle. Furthermore, at 20% and 30% PEmax, the external oblique (p<0.05 and<0.01, respectively) and the internal oblique (p<0.05 and<0.01, respectively) showed significantly elevated activity compared with the rectus abdominis muscle. At 10% PEmax, no significant differences were observed in muscle activity. Although we observed no significant difference between 10% and 20% PEmax, activity during 30% PEmax was significantly greater than during 20% PEmax (external oblique: p<0.05; internal oblique: p<0.01). The abdominal oblique muscles are the most active during forced expiration. Moreover, 30% PEmax is the minimum intensity required to achieve significant, albeit very slight, muscle activity during expiratory resistance.

KEYWORDS:

Expiratory muscle training; External oblique muscle; Forced expiration; Internal oblique muscle; Rectus abdominis muscle; Surface electromyography

PMID:
27077819
DOI:
10.1016/j.jelekin.2016.03.007
[Indexed for MEDLINE]

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