Journal of Applied Physiology AJP: Endocrinology and Metabolism
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J Appl Physiol 81: 1477-1483, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology
Vol. 81, No. 4, pp. 1477-1483, October 1996
EXERCISE AND MUSCLE

Abdominal muscle fatigue after maximal ventilation in humans

Dimitris Kyroussis, Gary H. Mills, Michael I. Polkey, Carl-Hugo Hamnegard, Nicholaos Koulouris, Malcolm Green, and John Moxham

King's College Hospital, London SE5 9PJ, and Royal Brompton Hospital, London SW3 6NP, United Kingdom

Received 18 July 1995; accepted in final form 17 April 1996.

Kyroussis, Dimitris, Gary H. Mills, Michael I. Polkey, Carl-Hugo Hamnegard, Nicholaos Koulouris, Malcolm Green, and John Moxham. Abdominal muscle fatigue after maximal ventilation in humans. J. Appl. Physiol. 81(4): 1477-1483, 1996.---Abdominal muscles are the principal muscles of active expiration. To investigate the possibility of abdominal muscle low-frequency fatigue after maximal ventilation in humans, we stimulated the nerve roots supplying the abdominal muscles. We used a magnetic stimulator (Magstim 200) powering a 90-mm circular coil and studied six normal subjects. To assess the optimum level of stimulation and posture, we stimulated at each intervertebral level between T7 and L1 in the prone, supine, and seated positions. At T10, we used increasing power outputs to assess the pressure-power relationship. Care was taken to avoid muscle potentiation. Twitch gastric pressure (Pga) was recorded with a balloon-tipped catheter. Mean (±SD) baseline twitch Pga measured with the subjects in the prone position at T10 was 23.5 ± 5.4 cmH2O. Within-occasion mean twitch Pga coefficient of variation was 4.6 ± 1.1%. Twitch Pga was measured with the subjects in the prone position with stimulation over T10 before and after 2 min of maximal isocapnic ventilation (MIV). Twenty minutes after MIV, mean twitch Pga fell by 17 ± 9.1% (P = 0.03) and remained low 90 min after MIV. We conclude that after maximal ventilation in humans there is a reduction of twitch Pga and, therefore, of low-frequency fatigue in abdominal muscles.

magnetic stimulation; low-frequency fatigue; twitch gastric pressure

0161-7567/96 $5.00 Copyright © 1996 the American Physiological Society




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