Document Detail

Recruitment of the serratus anterior as an accessory muscle of ventilation during graded exercise.
MedLine Citation:
PMID:  17408533     Owner:  NLM     Status:  MEDLINE    
The role of the serratus anterior (SA) as an accessory muscle of ventilation and its physiologic significance under exercising conditions remains unclear. Recent investigations have utilized the measurement of SA as an analog for respiratory muscle oxygenation. The purpose of this investigation was to examine the action of the serratus anterior via surface electromyography (EMG) and near infrared spectroscopy (NIRS) during exercise while controlling for muscular effort not related to ventilation. Nine healthy volunteers (age = 24.4 +/- 0.5 years, VO2max = 3.416 +/- 0.35 l min(-1); VEpeak = 127.5 +/- 13.1 l min(-1); TVpeak = 2.844 +/- 0.226 l) completed a graded exercise test to volitional exhaustion on a cycle ergometer. The subjects' arms were folded and relaxed at the abdomen to minimize muscular effort resulting from scapular stabilization during pushing/forward flexion of the arms associated with cycle ergometry. VO2 and V were monitored breath-by-breath throughout exercise. EMG was recorded over the right SA, and a near infrared probe was placed over the left SA. No significant differences were observed throughout the graded exercise test for tissue oxygenation (StO2) (n = 6, F[1.532, 7.661] = 0.895, P > 0.05, eta2 = 0.15) or EMG (n = 9, F[1.594, 12.75] = 3.067, P > 0.05, eta2 = 0.27). Although the recruitment of the SA has been postulated to aid in ventilation in various postures and disease states, it is concluded that it shows little muscular effort in healthy subjects during upright cycling. Additional research is needed to conclude the pertinence of utilizing StO2 of the SA as an analog for respiratory muscle oxygenation.
Daniel T Cannon; Sara L Grout; Courtney A May; Stephanie D Strom; Kathryn G Wyckoff; Daniel J Cipriani; Michael J Buono
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Publication Detail:
Type:  Journal Article     Date:  2007-04-06
Journal Detail:
Title:  The journal of physiological sciences : JPS     Volume:  57     ISSN:  1880-6546     ISO Abbreviation:  J Physiol Sci     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-25     Completed Date:  2007-08-09     Revised Date:  2008-12-29    
Medline Journal Info:
Nlm Unique ID:  101262417     Medline TA:  J Physiol Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  127-31     Citation Subset:  IM    
School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
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MeSH Terms
Exercise Test
Oxygen Consumption / physiology
Physical Exertion / physiology*
Respiratory Mechanics / physiology*
Respiratory Muscles / physiology*
Spectroscopy, Near-Infrared

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