At what level of heat load are age-related impairments in the ability to dissipate heat evident in females?

PloS One
Jill M StapletonGlen P Kenny

Abstract

Studies have reported that older females have impaired heat loss responses during work in the heat compared to young females. However, it remains unclear at what level of heat stress these differences occur. Therefore, we examined whole-body heat loss [evaporative (HE) and dry heat loss, via direct calorimetry] and changes in body heat storage (∆Hb, via direct and indirect calorimetry) in 10 young (23±4 years) and 10 older (58±5 years) females matched for body surface area and aerobic fitness (VO2peak) during three 30-min exercise bouts performed at incremental rates of metabolic heat production of 250 (Ex1), 325 (Ex2) and 400 (Ex3) W in the heat (40°C, 15% relative humidity). Exercise bouts were separated by 15 min of recovery. Since dry heat gain was similar between young and older females during exercise (p=0.52) and recovery (p=0.42), differences in whole-body heat loss were solely due to HE. Our results show that older females had a significantly lower HE at the end of Ex2 (young: 383±34 W; older: 343±39 W, p=0.04) and Ex3 (young: 437±36 W; older: 389±29 W, p=0.008), however no difference was measured at the end of Ex1 (p=0.24). Also, the magnitude of difference in the maximal level of HE achieved between the young and old...Continue Reading

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Citations

Jun 10, 2016·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Glen P KennyAndreas D Flouris
Oct 19, 2017·Medicine and Science in Sports and Exercise·Sean R NotleyGlen P Kenny
Apr 24, 2018·Medicine and Science in Sports and Exercise·Sean R NotleyGlen P Kenny
Nov 25, 2016·Journal of Applied Physiology·Glen P Kenny, Ryan McGinn
Nov 23, 2019·International Journal of Environmental Research and Public Health·Jakob PeterssonChuansi Gao
Jun 20, 2020·Journal of Applied Physiology·W Larry Kenney
Jun 5, 2020·Medicine and Science in Sports and Exercise·Andrew W D'SouzaGlen P Kenny
Aug 17, 2018·Medicine and Science in Sports and Exercise·Sean R NotleyGlen P Kenny
Mar 25, 2019·Temperature : Multidisciplinary Biomedical Journal·Glen P KennySean R Notley
Mar 30, 2017·Temperature : Multidisciplinary Biomedical Journal·Glen P KennyAndreas D Flouris
Nov 1, 2018·Temperature : Multidisciplinary Biomedical Journal·Anthony S LeichtGlen P Kenny
Jul 10, 2017·European Journal of Applied Physiology·Glen P KennyDaniel Gagnon
Feb 23, 2019·American Journal of Industrial Medicine·Sean R NotleyGlen P Kenny
Jan 3, 2020·European Journal of Applied Physiology·Antonia KaltsatouGlen P Kenny
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Dec 18, 2020·Frontiers in Physiology·Marta GrosiakEdyta T Sadowska
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Jun 3, 2021·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nicholas RavanelliDaniel Gagnon
Dec 29, 2020·Journal of Science and Medicine in Sport·W Larry KenneyLacy M Alexander

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Methods Mentioned

BETA
hormone replacement therapy

Software Mentioned

LabVIEW
Polar ProTrainer
GraphPad
GraphPad Prism

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