Effects of Dehydration, Physical Conditioning and Heat Acclimatization on the Response to Passive Tilting

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Abstract
The effects of dehydration on the response to passive tilting have been studied in 15 young men after physical conditioning, with and without heat acclimatization. Dehydration was associated with the following modifications of the ‘normal’ orthostatic response: an essentially unchanged systolic pressure, a consistent rise in diastolic pressure and a moderate decrease in pulse pressure. The pulse rate increased more rapidly with time in the upright position after dehydration than when hydrated. Physical conditioning, either with or without heat acclimatization, produced no apparent improvement in the pulse rate or blood pressure response to passive tilting after dehydration. Note: with the assistance of J. A. Vaughan Submitted on May 2, 1958