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 (Bethesda, Md. : 1985), 83 3: 753-60. doi:10.1152/jappl.1997.83.3.753


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 (Bethesda, Md. : 1985)   Check publisher's open access policy
ISSN 8750-7587
Publication date 1997-09-01
Sub-type Article (original research)
DOI 10.1152/jappl.1997.83.3.753
Open Access Status Not yet assessed
Volume 83
Issue 3
Start page 753
End page 60
Total pages 8
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Pubmed Import
 
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Created: Wed, 10 Jan 2018, 20:15:42 EST