Abstract
Effect of low and high intensity exercise on circulating growth hormone in men
Highlights
Gas exchange, GH, immunoreactive insulin, glucose, lactate, pyruvate, and epinephrine and norepinephrine were measured at regular intervals
There are reasonsto believe that the GH response to increasing work intensity is nonlinear in nature and may be characterized by a threshold: The purpose of this study was to test whether or not a work-intensity threshold could be identified for the GH response
The VOz reached a steady state during the 5- and lomin low intensity exercise bouts but not for high intensity exercise(Fig. 1)
Summary
Gas exchange (breath-by-breath), GH, immunoreactive insulin, glucose, lactate, pyruvate, and epinephrine and norepinephrine were measured at regular intervals. After the lo-min bouts of high compared with low intensity exercise, lactate was 7.2 f 3.7 mmol/L us. A minimum duration of 10 min, high intensity exercise consistently increased circulating GH in adult males. The GH responsemay be correlated to the lactate responseto exercise [9,10,11] which increases in a nonlinear manner with work intensity [12]. We hypothesized that exercisewould elicit a significant GH pulse only when the work rate exceeded the anaerobic or lactic acid threshold (high intensity exercise). The latter refers to the work rate above which circulating lactic acid increases[15, 16].
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