Journal of Applied Physiology
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J Appl Physiol 63: 1230-1235, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 3 1230-1235, Copyright © 1987 by American Physiological Society

ARTICLES

Effect of aerobic training on forced expiratory airflow in exercising asthmatic humans

F. Haas, S. Pasierski, N. Levine, M. Bishop, K. Axen, H. Pineda and A. Haas
Department of Rehabilitation Medicine, Rusk Institute, School of Medicine, New York University, New York 10016.

Pulmonary function after exercise was evaluated in 22 asthmatic subjects before and after a 36-session training sequence of aerobic exercise. Training did not change pulmonary function values, except for a small increase in maximal voluntary ventilation (P less than 0.02), which was attributed to respiratory muscle training. After aerobic training, both external work at a given heart rate and peak O2 consumption increased by 30 and 15%, respectively. At the same minute ventilation (VE), immediate postexercise forced expiratory airflow was higher after training (P less than 0.02), and reduction in forced expiratory airflow during the first 9 min postexercise was less after training (P less than 0.01). The posttraining airflow response to the pretraining work load was, as expected, less than the pretraining response (P less than 0.02). Although the difference in maximal-to-minimal airflow at the same VE was similar before and after training, the airflow increase accounted for 50% of the response after training compared with 16% of the pretraining response. Furthermore the strong negative correlation (P less than 0.01) between maximal and minimal airflow both pre- and posttraining indicates that exercise-induced bronchospasm (EIB) severity is, in part, determined by the degree of exercise-induced bronchodilation. We conclude that aerobic training significantly increases exercise-induced bronchodilation and diminishes EIB.


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