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J Appl Physiol 85: 310-317, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 1, 310-317, July 1998

Abnormal oxygen uptake kinetic responses in women with type II diabetes mellitus

Judith G. Regensteiner1,2,3, Timothy A. Bauer1, Jane E. B. Reusch4, Suzanne L. Brandenburg1, Jeffrey M. Sippel5, Andria M. Vogelsong1, Susan Smith1, Eugene E. Wolfel3, Robert H. Eckel4, and William R. Hiatt1,6

1 Section of Vascular Medicine, Divisions of 2 Internal Medicine, 3 Cardiology, 4 Endocrinology and 6 Geriatrics, Department of Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262; and 5 Division of Pulmonary Medicine, University of Oregon Health Sciences Center, Portland, Oregon 97201

Persons with type II diabetes mellitus (DM), even without cardiovascular complications have a decreased maximal oxygen consumption (VO2 max) and submaximal oxygen consumption (VO2) during graded exercise compared with healthy controls. We evaluated the hypothesis that change in the rate of VO2 in response to the onset of constant-load exercise (measured by VO2-uptake kinetics) was slowed in persons with type II DM. Ten premenopausal women with uncomplicated type II DM, 10 overweight, nondiabetic women, and 10 lean, nondiabetic women had a VO2 max test. On two separate occasions, subjects performed 7-min bouts of constant-load bicycle exercise at workloads below and above the lactate threshold to enable measurements of VO2 kinetics and heart rate kinetics (measuring rate of heart rate rise). VO2 max was reduced in subjects with type II DM compared with both lean and overweight controls (P < 0.05). Subjects with type II DM had slower VO2 and heart rate kinetics than did controls at constant workloads below the lactate threshold. The data suggest a notable abnormality in the cardiopulmonary response at the onset of exercise in people with type II DM. The findings may reflect impaired cardiac responses to exercise, although an additional defect in skeletal muscle oxygen diffusion or mitochondrial oxygen utilization is also possible.

oxygen consumption; exercise test; female


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