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Exercise intensity and glucose tolerance in trained and nontrained subjects



Exercise intensity and glucose tolerance in trained and nontrained subjects



Journal of Applied Physiology 67(1): 39-43



The improved glucose tolerance and increased insulin sensitivity associated with regular exercise appear to be the result, in large part, of the residual effects of the last bout of exercise. To determine the effects of exercise intensity on this response, glucose tolerance and the insulin response to a glucose load were determined in seven well-trained male subjects [maximal O2 uptake .ovrhdot.VO2max) = 58 ml .cntdot. kg -1 .cntdot. min-1] and in seven nontrained male subjects .ovrhdot.VO2max = 49 ml .cntdot. kg-1 min-1) in the morning after an overnight fast 1) 40 h after theladt training session (control), 2) 14 h after 40 min of exercise in a cycle ergometer at 40% .ovrhdot.VO2max, and 3) 14 h after 40 min of exercise at 80% .ovrhdot.VO2max. Subjects replicated their diets for 3 days before each test and ate a standard meal the evening before the oral glucose tolerance test. No differences in the 3-h insulin or glucose response were observed between the control trial and before exercise at either 40 or 80% .ovrhdot.VO2max in the trained subjects. In the nontrained subjects the plasma insulin response was decreased by 40% after a single bout of exercise at either 40 or 80% .ovrhdot.VO2max(70.0 .times. 103 vs. 5.0 .times. 103, P < 0.05; 3,8 .times. 103 .mu.U .cntdot. ml-1, P < 0.01). The insulin response after a single bout of exercise in the nontrained subjects was comparable with the insulin responses found in the trained subjects for the control and exercise trials. The results suggests that, in actively training individuals, the residual effects of exercise persist for at least 40 h and that the summed effects of repeated bouts of exercise are more important than the relative intensity of any one bout in maintaining glycemic control in the trained state.

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Accession: 001831180

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PMID: 2668256



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