The primary aim of this study is to assess cardiovascular changes (blood pressure, heart rate, electrocardiogram/ECG) in response to mild fluid-restriction dehydration and subsequent rehydration in healthy young and old people. Secondary aims are to assess changes in body composition, mood, and hunger in response to mild dehydration and rehydration.
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Cardiovascular changes
Timeframe: change from baseline to dehydration (+13 hours) and then rehydration (+15 hours)