Irving, B. A., Anderson, S. M., Weltman, J. Y., Watson-Winfield, D. D., Frick, K. I., Evans, W. S., Veldhuis, J. D., & Weltman, A. (2003). Time of exercise initiation following GH infusion does not affect metabolic and performance responses during acute exercise. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 1360.

Males (N = 6) completed six 30-min bicycle ergometer trials at a power output midway between lactate threshold and VO2peak. On five trials, Ss received a growth hormone infusion at 8 AM followed by a 30-min exercise trial initiated at one of the following times: 8:45, 9:30, 10:15; 11:00, or 11:45 AM. On another trial, Ss received a saline infusion and exercised at 8:45 AM.

There were no significant condition effects for any performance or metabolic measure.

Implication. Growth hormone infusion does not improve subsequent performance at an exercise intensity between lactate threshold and VO2peak.

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