Abstract
A large body of work has identified the response to and consequence of exercise in a hot climate. However, typically this has been laboratory-based, which often misrepresents such a 'climate'. Those field studies conducted have often been based in the Northern Hemisphere during summer periods. Solar stress during a Southern Hemisphere summer, particularly New Zealand, is ~10 % greater for a given latitude in the Northern Hemisphere (or the combined effects of an equator-ward shift of 4° in latitude and 1 km increase in altitude) due to i) greater irradiances due to a lesser Sun-Earth separation owing to the elliptical orbit of the Earth about the Sun, ii) lower ozone levels due to the lesser Sun-Earth separation, and iii) lower tropospheric pollution [1]. The purpose of this study was to measure heat exposure and strain from running outdoors in the New Zealand summer, in order to determine what factor(s) might predict performance and risk for heat illness.
Highlights
A large body of work has identified the response to and consequence of exercise in a hot climate
Of the six weeks observed, two weeks measured a WBGT above 27 °C; for both these weeks Tdb remained below 26 °C and relative humidity below 60 % (Twb ≤ 20 °C) whilst Tbg measured 53 and 57 °C, respectively
An end-Tgi > 40 °C was observed on 10 occasions, few participants registered symptoms of heat illness and mean thermal sensation registered above “warm” only on three of the ten occasions and mean thermal comfort never registered above “uncomfortable.” Linear regression identified perceived exertion and thermal comfort at the end of the race as strongest predictors of performance, Tdb and Twb as strongest predictors of end-Tcore, and performance time and starting Tgi as strongest predictors of heat illness symptoms
Summary
A large body of work has identified the response to and consequence of exercise in a hot climate. Typically this has been laboratory-based, which often misrepresents such a ‘climate’. Those field studies conducted have often been based in the Northern Hemisphere during summer periods. The purpose of this study was to measure heat exposure and strain from running outdoors in the New Zealand summer, in order to determine what factor(s) might predict performance and risk for heat illness Solar stress during a Southern Hemisphere summer, New Zealand, is ~10 % greater for a given latitude in the Northern Hemisphere (or the combined effects of an equator-ward shift of 4° in latitude and 1 km increase in altitude) due to i) greater irradiances due to a lesser Sun-Earth separation owing to the elliptical orbit of the Earth about the Sun, ii) lower ozone levels due to the lesser Sun-Earth separation, and iii) lower tropospheric pollution [1].
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