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2007, Piran, Slovenia

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Environmental Ergonomics XII<br />

Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana <strong>2007</strong><br />

from the cold fluid. Participants were monitored for core body temperature, skin temperature,<br />

heart rate and body mass changes and fluid intake to estimate sweat loss. In addition,<br />

subjective ratings of perceived exertion and body discomfort were also provided by<br />

participants before and after each bout. The thermal and cardiovascular responses to the trial,<br />

including both work bouts, were described and compared using analysis of variance<br />

(ANOVA) with Tukey’s HSD or t-tests where appropriate. Heart rate data were expressed as<br />

a percentage of Heart Rate Reserve (%HRR) according to Howley’s (2001) classification<br />

system. Data reported as mean ± SD.<br />

RESULTS<br />

The mean ambient temperature immediately surrounding the participants was 19 ±1 ° C and 21<br />

±1 ° C in the morning and afternoon bouts, respectively (p 38.0 °C 70 ± 58 63 ± 51<br />

> 38.5 °C 6 ± 14 6 ± 25<br />

> 39.0 °C 0 ± 0 0 ± 0<br />

The average mean skin temperature in the morning and afternoon bouts was 33.3 ±0.5 ° C and<br />

33.5 ±0.4 ° C, respectively, with no difference between bouts. The mean %HRR for both bouts

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