Why the study?
Does dehydration affect the orthostatic response to passive tilting in young men after physical conditioning?
Does dehydration affect the orthostatic response to passive tilting in young men after physical conditioning?
Dehydration alters the orthostatic response to passive tilting by increasing diastolic pressure and pulse rate, an effect that is not mitigated by physical conditioning or heat acclimatization.
Answers are grounded in this paper and cite their sources.
Dehydration may warrant orthostatic caution in young men; leaves open mitigation by conditioning or acclimatization.
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
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Beetham et al. (1958) studied this question.
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