Contractions of specific abdominal muscles in postural tasks are affected by respiratory maneuvers

Hodges, P. W., Gandevia, S. C. and Richardson, C. A. (1997) Contractions of specific abdominal muscles in postural tasks are affected by respiratory maneuvers. Journal of Applied Physiology, 83 3: 753-760.


Author Hodges, P. W.
Gandevia, S. C.
Richardson, C. A.
Title Contractions of specific abdominal muscles in postural tasks are affected by respiratory maneuvers
Journal name Journal of Applied Physiology   Check publisher's open access policy
ISSN 1522-1601
8750-7587
Publication date 1997-01-01
Year available 1997
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 83
Issue 3
Start page 753
End page 760
Total pages 8
Place of publication Bethesda, MD
Publisher American Physiological Society
Language eng
Subject 11 Medical and Health Sciences
Abstract The influence of respiratory activity of the abdominal muscles on their reaction time in a postural task was evaluated. The electromyographic (EMG) onsets of the abdominal muscles and deltoid were evaluated in response to shoulder flexion initiated by a visual stimulus occurring at random throughout the respiratory cycle. Increased activity of the abdominal muscles was produced by inspiratory loading, forced expiration below functional residual capacity, and a static glottis-closed expulsive maneuver. During quiet breathing, the latency between activation of the abdominal muscles and deltoid was not influenced by the respiratory cycle. When respiratory activity of the abdominal muscles increased, the EMG onset of transversus abdominis and internal oblique, relative to deltoid, was significantly earlier for movements beginning in expiration, compared with inspiration [by 97-107 ms (P < 0.01) and 64-90 ms (P < 0.01), respectively]. However, the onset of transversus abdominis EMG was delayed by 31-54 ms (P < 0.01) when movement was performed during a static expulsive effort, compared with quiet respiration. Thus changes occur in early anticipatory contraction of transversus abdominis during respiratory tasks but they cannot be explained simply by existing activation of the motoneuron pool.
Keyword Physiology
Sport Sciences
Postural Reaction
Abdominal Muscles
Trunk
Motor Control
Respiratory Loading
Motoneuron Pool
Voluntary Arm Movements
Intraabdominal Pressure
Adjustments
Humans
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Tue, 14 Aug 2007, 02:56:29 EST