Regulation of growth hormone during exercise by oxygen demand and availability |
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Authors: | W. P. VanHelder K. Casey M. W. Radomski |
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Affiliation: | (1) Department of Physiology, and the School of Physical and Health Education, University of Toronto, Canada;(2) Defence and Civil Institute of Environmental Medicine, Downsview, P. O. Box 2000, M3M 3B9, Ontario, Canada |
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Abstract: | Summary Five normal men performed seven sets of seven squats at a load equal to 80% of their seven repetition maximum. Plasma growth hormone (GH) and lactate levels increased during and after the completion of the exercise. A significant (r=0.93, P<0.001) linear correlation was found between GH changes and the corresponding oxygen Demand/Availability (D/A) ratio expressed by (where f=[lactate at time x]/[lactate at time 0]). A retrospective examination of previously published data from our laboratory and others also demonstrated the existence of a significant correlation between changes in plasma GH levels and the D/A ratios over a wide variety of exercise; aerobic and anaerobic, continuous and intermittent, weight lifting and cycling, in both fit and unfit subjects under normoxic and hypoxic conditions. It is suggested that the balance between oxygen demand and availability may be an important regulator of GH secretion during exercise. DCIEM No. 87-P-27 |
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Keywords: | Growth hormone Lactic acid Oxygen demand Oxygen availability Exercise |
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