×

Please Remove Adblock
Adverts are the main source of Revenue for DoveMed. Please remove adblock to help us create the best medical content found on the Internet.

Whole-Body Heat Stress Lowers Exercise Capacity, Blood Flow In Men

Last updated Feb. 11, 2017

Approved by: Maulik P. Purohit MD MPH

William Stitt

Nine male volunteers (average age 26) exercised on a stationary bicycle after spending time in a hot environment created by wearing a suit that circulated 122-degree Fahrenheit water.


Researchers have found that prolonged exposure to high temperatures can raise both the skin and core temperature, reducing blood flow to the brain and limbs during exercise and limiting the ability to exercise for long periods. The study, the first of its kind to separate the effects of skin- versus internal-raised temperature (hyperthermia), is published in Physiological Reports.

Nine male volunteers (average age 26) exercised on a stationary bicycle after spending time in a hot environment created by wearing a suit that circulated 122-degree Fahrenheit water. Before one exercise test, the volunteers were exposed to heat for 13 minutes, enough time to raise their skin temperature ("mild hyperthermia"). Another exercise test took place after 52 minutes of heat exposure, during which the temperature of the participants' core body temperature increased ("moderate hyperthermia").

Researchers took blood samples in the last minute of each exercise test. Skin and core body temperature was measured throughout each exercise test. The research team also measured blood flow to the brain and legs during each test.

The findings showed that moderate, but not mild, hyperthermia led to a lower threshold for exercise capacity and decreased blood flow. The researchers found that the body is able to compensate when heat stress is restricted to only the skin, but "the combination of multiple stressors triggered by whole body hyperthermia, however, resulted in a compromised aerobic capacity." Blood flow to the legs and brain was also lower with moderate hyperthermia.


Materials provided by American Physiological Society (APS)Note: Content may be edited for style and length.

Disclaimer: DoveMed is not responsible for the accuracy of the adapted version of news releases posted to DoveMed by contributing universities and institutions.

Primary Resource:

Trangmar, S. J., Chiesa, S. T., Kalsi, K. K., Secher, N. H., & González-Alonso, J. (2016). Whole body hyperthermia, but not skin hyperthermia, accelerates brain and locomotor limb circulatory strain and impairs exercise capacity in humans. DOI: 10.14814/phy2.13108

Reviewed and Approved by a member of the DoveMed Editorial Board
First uploaded: Feb. 11, 2017
Last updated: Feb. 11, 2017