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J Appl Physiol 90: 1877-1881, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 5, 1877-1881, May 2001

Function of human eccrine sweat glands during dynamic exercise and passive heat stress

Narihiko Kondo1, Manabu Shibasaki2, Ken Aoki1, Shunsaku Koga3, Yoshimitsu Inoue4, and Craig G. Crandall5

1 Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, Kobe 657-8501; 2 Nara Women's University, Nara 630-8506; 3 Kobe Design University, Kobe 651-2196; 4 Osaka International University for Women, Osaka 570-8555, Japan; and 5 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Texas 75231

The purpose of this study was to identify the pattern of change in the density of activated sweat glands (ASG) and sweat output per gland (SGO) during dynamic constant-workload exercise and passive heat stress. Eight male subjects (22.8 ± 0.9 yr) exercised at a constant workload (117.5 ± 4.8 W) and were also passively heated by lower-leg immersion into hot water of 42°C under an ambient temperature of 25°C and relative humidity of 50%. Esophageal temperature, mean skin temperature, sweating rate (SR), and heart rate were measured continuously during both trials. The number of ASG was determined every 4 min after the onset of sweating, whereas SGO was calculated by dividing SR by ASG. During both exercise and passive heating, SR increased abruptly during the first 8 min after onset of sweating, followed by a slower increase. Similarly for both protocols, the number of ASG increased rapidly during the first 8 min after the onset of sweating and then ceased to increase further (P > 0.05). Conversely, SGO increased linearly throughout both perturbations. Our results suggest that changes in forearm sweating rate rely on both ASG and SGO during the initial period of exercise and passive heating, whereas further increases in SR are dependent on increases in SGO.

density of activated sweat glands; sweat output per gland; thermoregulatory sweating


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