Cognitive and perceptual responses during passive heat stress in younger and older adults

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Zachary J SchladerCraig G Crandall

Abstract

We tested the hypothesis that attention, memory, and executive function are impaired to a greater extent in passively heat-stressed older adults than in passively heat-stressed younger adults. In a randomized, crossover design, 15 older (age: 69 ± 5 yr) and 14 younger (age: 30 ± 4 yr) healthy subjects underwent passive heat stress and time control trials. Cognitive tests (outcomes: accuracy and reaction time) from the CANTAB battery evaluated attention [rapid visual processing (RVP), choice reaction time (CRT)], memory [spatial span (SSP), pattern recognition memory (PRM)], and executive function [one touch stockings of Cambridge (OTS)]. Testing was undertaken on two occasions during each trial, at baseline and after internal temperature had increased by 1.0 ± 0.2°C or after a time control period. For tests that measured attention, reaction time during RVP and CRT was slower (P ≤ 0.01) in the older group. During heat stress, RVP reaction time improved (P < 0.01) in both groups. Heat stress had no effect (P ≥ 0.09) on RVP or CRT accuracy in either group. For tests that measured memory, accuracy on SSP and PRM was lower (P < 0.01) in the older group, but there was no effect of heat stress (P ≥ 0.14). For tests that measured execu...Continue Reading

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Citations

Mar 27, 2016·European Journal of Applied Physiology·Ryosuke TakedaKazunobu Okazaki
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Jul 3, 2021·International Journal of Environmental Research and Public Health·Yuehong QiuCan Jiao
May 21, 2021·Journal of Applied Physiology·Jem L ChengMaureen J MacDonald

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