Increased age and reduced physical activity level worsen thermoregulatory pacing behaviour in men during walking exercise in the heat.

Millyard, Alison, Ogden, Henry B., Waterworth, Sally P., Pyne, David B., Layden, Joseph D. and Bloxham, Saul (2024) Increased age and reduced physical activity level worsen thermoregulatory pacing behaviour in men during walking exercise in the heat. Journal of Thermal Biology, 127. p. 104019. ISSN 03064565

Preview

Text
Increased age and reduced physical activity level worsen thermoregulatory.pdf - Accepted Version
Available under License Creative Commons Attribution.
Download (984kB) | Preview

Official URL: https://doi.org/10.1016/j.jtherbio.2024.104019

Abstract

Older adults are vulnerable to heat-related morbidity and mortality due to reduced thermoregulatory function associated with aging. The aim of this study was to examine the relationship between age and thermoregulatory behaviour during walking exercise in Control (22°C; 40% relative humidity [RH]) and Hot (35°C, 40% RH) conditions. Thirty-six healthy males (age 46 ± 20 (range 19 to 86) years; stature 177 ± 7 cm; body mass 75.7 ± 11.3 kg; BMI 24.2 ± 2.9 kg.m-2; Ʃskinfolds 33.3 ± 10.5 mm; mean ± SD) each completed two experimental trials, one in Control and one in Hot conditions. Each trial consisted of three bouts of 10 minutes walking at a rating of perceived exertion (RPE) of 13, interspersed with 5 minutes of seated rest. Thermoregulatory behaviour was assessed as the ratio between distance walked in the Control and Hot trials. Participants walked 3.8% less in the Hot (2.63 ± 0.46 km) than in the Control (2.73 ± 0.4 km) condition (t(36) = -2.38, p=0.023, d=0.26). Regression analysis demonstrated that age was the primary predictor of thermoregulatory pacing behaviour, explaining 23% of the variance (Std β = -0.475, p=0.003). Including physical activity levels (PASE) increased the variance accounted to 32% (age Std β = -0.396, p=0.011; PASE Std β= 0.319, p=0.038). In conclusion, thermoregulatory pacing behaviour was impaired with increased age and reduced physical activity when undertaking walking exercise at a perceived exertion of ‘somewhat hard’ in hot ambient conditions.

Item Type:	Article
Keywords:	Exercise, Pacing behaviour, Aging, Thermoregulation, Physical activity
Depositing User:	Ms Raisa Burton
Date Deposited:	19 Dec 2024 11:33
Last Modified:	08 Jan 2025 09:58
URI:	https://marjon.repository.guildhe.ac.uk/id/eprint/17923
Related URLs:	https://www.sci ... 2377?via%3Dihub

Actions (login required)

Edit Item