Comparing thermoregulatory responses between short and long moderate intensity intermittent exercise protocols with the same duty cycle

Tze-Huan Lei; Chien Lin; Tatsuro Amano; Anna Ooue; Toby Mündel; James David Cotter; Naoto Fujii; Takeshi Nishiyasu; Narihiko Kondo

doi:10.1016/j.jtherbio.2023.103750

Comparing thermoregulatory responses between short and long moderate intensity intermittent exercise protocols with the same duty cycle

J Therm Biol. 2024 Jan:119:103750. doi: 10.1016/j.jtherbio.2023.103750. Epub 2023 Nov 29.

Authors

Tze-Huan Lei¹, Chien Lin², Tatsuro Amano³, Anna Ooue⁴, Toby Mündel⁵, James David Cotter⁶, Naoto Fujii⁷, Takeshi Nishiyasu⁷, Narihiko Kondo⁸

Affiliations

¹ Occupational Safety and Health Group (OSHG), College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, China; Laboratory for Applied Human Physiology, Graduate School of Human Development and Environment, Kobe University, Kobe, Japan.
² Laboratory for Applied Human Physiology, Graduate School of Human Development and Environment, Kobe University, Kobe, Japan.
³ Faculty of Education, Niigata University, Niigata, Japan.
⁴ Faculty of Food and Nutritional Sciences, Toyo University, Japan.
⁵ Department of Kinesiology, Brock University, St. Catharines, Canada.
⁶ School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand.
⁷ Faculty of Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan.
⁸ Laboratory for Applied Human Physiology, Graduate School of Human Development and Environment, Kobe University, Kobe, Japan. Electronic address: kondo@kobe-u.ac.jp.

PMID: 38071897
DOI: 10.1016/j.jtherbio.2023.103750

Abstract

To date, the thermoregulatory response between continuous and intermittent exercises has been investigated whilst limited studies are available to examine the thermoregulatory responses between different modes of intermittent exercises. We sought to determine the effect of two patterns of short duration intermittent exercises (180:180 (3-min) and 30:30 s (30-s) work: rest) on thermoregulatory responses in a temperate environment (25 °C, 50% RH, vapor pressure: 1.6 kPa) with low airflow (0.2 m/s). Twelve male participants (Age:24.0(5.0) year; VO₂max: 53(8) mL.kg^-1.min^-1; BSA:1.7(0.1) m²) cycled at 50% VO₂max for 60 min in 3-min and 30-s intervals to result in the same 30-min net exercise duration. Core and skin temperatures, the percent increase of skin blood flow (forearm and chest) from baseline and local sweat rate (forearm and chest) were not different between 3-min and 30-s (all P > 0.35) from the onset of exercise to the end of the exercise. Similarly, the mean body temperature onsets of skin blood flow (forearm and chest) and local sweat rates (forearm and chest) were not different between different mode of intermittent exercises (all P > 0.1). Furthermore, thermal sensitivities of skin blood flow (forearm and chest) and local sweat rate (forearm and chest) with increasing mean body temperature were not different between different mode of intermittent exercises (all P > 0.1). We conclude that intermittent exercises with different work periods at moderate exercise intensity did not alter core temperature and thermoeffector responses in a temperate environment. (241/250).

Keywords: Cutaneous vasodilation and body temperature; Sudomotor response.

MeSH terms

Adult
Body Temperature
Body Temperature Regulation* / physiology
Hot Temperature
Humans
Male
Skin / blood supply
Skin Temperature
Sweating*
Young Adult