The effect of exercising in the cold on markers of fluid balance in women
Cornachione, Kristen Marie.
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The purpose of the study was to examine the effects of a cold temperature environment on markers of fluid balance in women during submaximal exercise. Nine women completed a 90-minute submaximal cycling protocol in both a cold (-5°C) and temperate (24°C) environment. The dependent variables were heart rate (HR), systolic and diastolic blood pressure (SBP, DBP), ratings of perceived exertion (RPE), percent change in plasma volume (%DeltaPV), and percent change in body mass (%DeltaBM). A two-way RMANOVA was used to detect differences over time and temperature condition. Over time, HR, SBP, and RPE increased during exercise irrespective of temperature environment, while DBP did not change significantly. Between condition, %DeltaPV and %DeltaBM were significantly lower in the cold environment. The combination of results indicates that water is shifting out of the plasma volume, but is then being restored after termination of cold exposure and exercise.