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The physiological responses of hypertensive subjects to a single bout of exercise in a hot environment have been investigated. It was the purpose of this study to compare the effect of successive days of exercise in the heat on borderline hypertensive and normotensive individuals, with particular interest being paid to the positive relationship that exists between plasma volume and blood pressure. Eight hypertensive subjects (HT) and 8 normotensive controls (NT) performed a standardized work task, (walking for 60 minutes at 3.5 mph on a 5% grade), in dry heat, (40C, 257. RH), on 7 successive days. Working capacity and acclimatization were compared during two, 90 minute heat tolerance tests (HTT), one prior to, and the other following the acclimation period.Both groups demonstrated a similar degree of heat acclimation, as reflected in significantly lower HTT2 core temperatures, (P< 0.05), and heart rates, (p< 0.01). Plasma volume expansion over the 9 days was also equal for both groups (+77.), but appeared to have no effect on their resting or exercising blood pressures. No differences were observed in the ability of either group to complete the work task, although the HT group exercised at a significantly higher percentage of their maximal oxygen uptake, (p< 0.05), than the NTs.These results indicate that no abbreviation in working capacity is experienced by borderline HT'% during exercise in the heat as a consequence of their high blood pressure. The anticipated elevation in blood pressure as a result of an expansion i n plasma volume did not occur. Consequently, these individuals show the same positive acclimation to exercise in the heat as their NT counterparts. / School of Physical Education

There is no abstract available for this dissertation. / School of Physical Education, Sport, and Exercise Science

The effects of heat tolerance on exercise performance has been observed by various investigators. The purpose of this study was to compare the degree of heat acclimatization of normally active men and trained competitive swimmers and runners, and to assess the influence of the training on one's ability to tolerate heat. Three groups of men were tested to determine the effects of environmental training on heat tolerance. The men were tested once before training and again after training; a control group was also tested to note any seasonal change. The men were tested on a Monarck bicycle ergometer in a hot (60°C.) dry (6%) environment. The variables measured were heart rates, rectal temperatures, three skin temperatures, and weight loss. It was found in this study that with training, the runners increased significantly their tolerance to heat while the swimmers did not improve significantly. It can be interpreted that running does more for heat acclimatization than does swimming.