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Abstract Persons with type II diabetes mellitus (DM), even without cardiovascular complications have a decreased maximal oxygen consumption (V˙ o 2 max ) and submaximal oxygen consumption (V˙ o 2 ) during graded exercise compared with healthy controls. We evaluated the hypothesis that change in the rate ofV˙ o 2 in response to the onset of constant-load exercise (measured byV˙ o 2 -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 aV˙ o 2 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 V˙ o 2 kinetics and heart rate kinetics (measuring rate of heart rate rise).V˙ o 2 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 slowerV˙ o 2 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 Footnotes Address for reprint requests: J. G. Regensteiner, Sect. of Vascular Medicine, Divs. of Internal Medicine and Cardiology, Univ. of Colorado Health Sciences Center, Box B-180, 4200 E. Ninth Ave., Denver, CO 80262 (E-mail: judy.regensteiner@uchsc.edu ). This study was funded by a clinical research grant from the American Diabetes Association to J. G. Regensteiner and by the General Clinical Research Center RR 501RR-00051. W. R. Hiatt is the recipient of the National Institutes of Health Academic Award in Vascular Disease. The study was presented in abstract form to the American Federation for Clinical Research in Washington, DC, in May 1997. Copyright © 1998 the American Physiological Society
Journal of Applied Physiology – The American Physiological Society
Published: Jul 1, 1998
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