Journal of Applied Physiology
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J Appl Physiol 85: 1357-1361, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 4, 1357-1361, October 1998

Moderate exercise increases postexercise thresholds for vasoconstriction and shivering

G. P. Kenny1, A. A. Chen2, B. A. Nurbakhsh2, P. M. Denis1, C. E. Proulx1, and G. G. Giesbrecht2

1 Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario K1N 6N5; and 2 Laboratory for Exercise and Environmental Medicine, Health, Leisure and Human Performance Research Institute, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

The purpose of this study was to evaluate the effect of exercise on the subsequent postexercise thresholds for vasoconstriction and shivering. On two separate days, with six subjects (3 women), a whole body water-perfused suit slowly decreased mean skin temperature (~7.0°C/h) until thresholds for vasoconstriction and shivering were clearly established. Subjects were then rewarmed by increasing water temperature until both esophageal and mean skin temperatures returned to near-baseline values. Subjects either performed 15 min of cycle ergometry (65% maximal O2 consumption) followed by 30 min of recovery (Exercise) or remained seated with no exercise for 45 min (Control). Subjects were then cooled again. We mathematically compensated for changes in skin temperatures by using the established linear cutaneous contribution of skin to the control of vasoconstriction and shivering (20%). The calculated core temperature threshold (at a designated skin temperature of 30.0°C) for vasoconstriction increased significantly from 36.64 ± 0.20 to 36.89 ± 0.22°C postexercise (P < 0.01). Similarly, the shivering threshold increased from 35.73 ± 0.13 to 36.13 ± 0.12°C postexercise (P < 0.01). In contrast, sequential measurements, without exercise, demonstrate a time-dependent decrease in both the vasoconstriction (0.10°C) and shivering (0.12°C) thresholds. These data indicate that exercise has a prolonged effect by increasing the postexercise thresholds for both cold thermoregulatory responses.

esophageal temperature; thermoregulation; heat loss


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