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J Appl Physiol 83: 1256-1269, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 83, No. 4, pp. 1256-1269, October 1997
EXERCISE AND MUSCLE

Human respiratory muscle actions and control during exercise

A. Aliverti1, S. J. Cala2, R. Duranti4, G. Ferrigno1, C. M. Kenyon2, A. Pedotti1, G. Scano4, P. Sliwinski2, Peter T. Macklem2, and S. Yan3

1 Politecnico di Milano, Dipartimento di Bioingegneria, Centro di Bioingegneria, Milan, Italy; 2 Meakins-Christie Laboratories, McGill University, and 3 Montréal Chest Institute, Montreal, Quebec, Canada H2X 2P4; and 4 First Clinica Medica III, Università di Firenze, Florence, Italy

Received 24 July 1996; accepted in final form 17 April 1997.

Aliverti, A., S. J. Cala, R. Duranti, G. Ferrigno, C. M. Kenyon, A. Pedotti, G. Scano, P. Sliwinski, Peter T. Macklem, and S. Yan. Human respiratory muscle actions and control during exercise. J. Appl. Physiol. 83(4): 1256-1269, 1997.---We measured pressures and power of diaphragm, rib cage, and abdominal muscles during quiet breathing (QB) and exercise at 0, 30, 50, and 70% maximum workload (Wmax) in five men. By three-dimensional tracking of 86 chest wall markers, we calculated the volumes of lung- and diaphragm-apposed rib cage compartments (Vrc,p and Vrc,a, respectively) and the abdomen (Vab). End-inspiratory lung volume increased with percentage of Wmax as a result of an increase in Vrc,p and Vrc,a. End-expiratory lung volume decreased as a result of a decrease in Vab. Delta Vrc,a/Delta Vab was constant and independent of Wmax. Thus we used Delta Vab/time as an index of diaphragm velocity of shortening. From QB to 70% Wmax, diaphragmatic pressure (Pdi) increased ~2-fold, diaphragm velocity of shortening 6.5-fold, and diaphragm workload 13-fold. Abdominal muscle pressure was ~0 during QB but was equal to and 180° out of phase with rib cage muscle pressure at all percent Wmax. Rib cage muscle pressure and abdominal muscle pressure were greater than Pdi, but the ratios of these pressures were constant. There was a gradual inspiratory relaxation of abdominal muscles, causing abdominal pressure to fall, which minimized Pdi and decreased the expiratory action of the abdominal muscles on Vrc,a gradually, minimizing rib cage distortions. We conclude that from QB to 0% Wmax there is a switch in respiratory muscle control, with immediate recruitment of rib cage and abdominal muscles. Thereafter, a simple mechanism that increases drive equally to all three muscle groups, with drive to abdominal and rib cage muscles 180° out of phase, allows the diaphragm to contract quasi-isotonically and act as a flow generator, while rib cage and abdominal muscles develop the pressures to displace the rib cage and abdomen, respectively. This acts to equalize the pressures acting on both rib cage compartments, minimizing rib cage distortion .

rib cage distortion; velocity of shortening; respiratory kinematics; flow generation; diaphragm; power

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




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