Abstract
We compared sweat rate and variables such as workload (W e), metabolic heat production (H prod), and temperature increment load (T inc) across Sasang types. 304 apparently healthy participants aged 20–49 years with their Sasang type determined were enrolled. Local sweat rates on the chest (LSRchest) and back (LSRback) were measured using a perspiration meter during a maximum treadmill exercise test. Oxygen uptake was measured continuously using a breath-by-breath mode indirect calorimeter. The TaeEum (TE) type had a larger body size, a higher percent body fat, and a lower body area surface area (BSA) to body mass compared with the other Sasang types, particularly the SoEum (SE) type. The TE type tended to have a shorter exercise time to exhaustion and lower maximal oxygen uptake (mL·kg−1·min−1) than the other types. LSRchest in TE types was greater than that of the SE and SoYang (SY) types in men, whereas LSRback was higher in the TE type than that of the other types in women. After normalizing LSR for W e, H prod, T inc, and BSA, this tendency still remained. Our findings suggest that the thermoregulatory response to graded exercise may differ across Sasang types such that the TE type was the most susceptible to heat stress.
Highlights
During exercise, 75% of metabolic energy is released as heat, causing body core temperature to rise
Our study is the first to investigate the sweat rate (SR) produced by graded exercise in Sasang typology
Our primary finding was that the SR was highest among TE and lowest among SE participants during the middle stage of graded exercise, and this difference persisted when SR was normalized to sweat-induced factors such as We, heat production (Hprod), and temperature increment load (Tinc)
Summary
75% of metabolic energy is released as heat, causing body core temperature to rise. Thermoregulatory mechanisms maintain body temperature primarily through convection to the surrounding air and evaporation of sweat [1, 2] Anthropometric characteristics such as body size, body surface area- (BSA-) to-mass ratio (BSA/M), percent body fat, and subcutaneous adipose tissue affect thermoregulation during exercise [3,4,5]. Sasang constitutional medicine (SCM) is a form of traditional Korean medicine that focuses on the relationship between phenotypes and clinical features According to this theory, humans can be classified into four constitutional types, TaeYang (TY), SoYang (SY), TaeEum (TE), and SoEum (SE), which differ in their physiological and psychological features, vulnerability to particular patterns of illnesses, and responses to external conditions including the thermoregulatory response [6, 7]. We used an indirect calorimeter and hygrometer to objectively examine constitutionspecific sweat responses during graded exercise to investigate
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