Assessment of abdominal muscle contractility, strength, and fatigue.

Details

Serval ID
serval:BIB_BD6A88B1BC25
Type
Article: article from journal or magazin.
Collection
Publications
Title
Assessment of abdominal muscle contractility, strength, and fatigue.
Journal
American Journal of Respiratory and Critical Care Medicine
Author(s)
Suzuki J., Tanaka R., Yan S., Chen R., Macklem P.T., Kayser B.
ISSN
1073-449X (Print)
ISSN-L
1073-449X
Publication state
Published
Issued date
1999
Peer-reviewed
Oui
Volume
159
Number
4 Pt 1
Pages
1052-1060
Language
english
Abstract
We evaluated abdominal muscle contractility and fatigue by measuring twitch gastric pressure (Pgat) after percutaneous supramaximal electrical stimulation of the abdominal wall before and after sit-ups to task failure. Mouth pressures during maximal voluntary expulsive maneuvers (PEmax) at TLC and FRC with superimposed twitches, and maximum voluntary ventilation (MVV) were also assessed. Mean fresh Pgat was 36.1 +/- 3.0 cm H2O with a coefficient of variation that ranged between 3.0 to 4.8%. Pgat decreased by 25% (p < 0.001) and 37% (p < 0.001) at 1 and 30 min after sit-ups. During maximal voluntary contraction twitch occlusion never occurred. PEmax at TLC and FRC decreased by 15% (p < 0.001) and 11% (p < 0.017) at 1 min, and 8% (p < 0.036) and 9% (p < 0.030) at 30 min after sit-ups, respectively. Despite the abdominal muscle fatigue, MVV values at 1 and 30 min after sit-ups were not significantly different from the value obtained before the sit-ups. We conclude that (1) Pgat is a useful objective indicator of abdominal muscle contractility and fatigue; (2) during maximal voluntary expulsive maneuvers the abdominal muscles are never fully activated; (3) sit-ups lead to substantial low-frequency fatigue but little high-frequency fatigue of the abdominal muscles, which has little effect on maximal breathing capacity.

Keywords
Abdominal Muscles/physiology, Adult, Diaphragm/physiology, Electric Stimulation, Electromyography, Exercise, Functional Residual Capacity, Humans, Male, Maximal Voluntary Ventilation, Mouth/physiology, Muscle Contraction, Muscle Fatigue, Pressure, Pulmonary Ventilation, Respiratory Muscles/physiology, Total Lung Capacity
Pubmed
Web of science
Create date
30/10/2017 14:52
Last modification date
20/08/2019 15:31
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