Electromyographic activity while performing the anti-G straining maneuver during high sustained acceleration

M. W. Cornwall, L. P. Krock

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The purpose of this study was to measure the muscle activity during performance of the anti-G straining maneuver (AGSM) at high sustained acceleration stress (+Gz = head-to-foot inertial loading). Ten males were exposed on three separation occasions to a rapid onset rate of 6 + Gz. Subjects wore standard United States Air Force (USAF) anti-G trousers and performed the AGSM until perceived fatigue or until achieving light loss criteria. During each exposure, surface electromyography (EMG) was recorded from the erector spinae, external oblique, bicep femoris, vastus lateralis, and lateral gastrocnemius muscles. The normalized root-mean squares (RMS) and mean power frequency (MPF) for each muscle were calculated and tested for significant differences with an analysis of variance (ANOVA) procedure. The results of this study showed that mean amplitude decreased during the AGSM (35.40%) while MPF showed no significant change. The EMG amplitude of lower extremity muscles decreased (61.45%) while the amplitude of trunk muscles decreased slightly (3.45%). These results indicate that during the performance of the AGSM, motor unit recruitment in lower extremity muscles decrease without evidence of fatigue.

Original languageEnglish (US)
Pages (from-to)971-975
Number of pages5
JournalAviation Space and Environmental Medicine
Volume63
Issue number11
StatePublished - Jan 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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