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J Appl Physiol 83: 753-760, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 83, No. 3, pp. 753-760, September 1997
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

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

Paul W. Hodges1, Simon C. Gandevia2, and Carolyn A. Richardson1

1 Department of Physiotherapy, The University of Queensland, Brisbane, Queensland 4072; and 2 Prince of Wales Medical Research Institute, University of New South Wales, Sydney, New South Wales 2031, Australia

Received 29 July 1996; accepted in final form 5 May 1997.

Hodges, Paul W., Simon C. Gandevia, and Carolyn A. Richardson. Contractions of specific abdominal muscles in postural tasks are affected by respiratory maneuvers. J. Appl. Physiol. 83(3): 753-760, 1997.---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.

postural reaction; abdominal muscles; trunk; motor control; respiratory loading; motoneuron pool

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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