Plasma Hyperosmolality Improves Tolerance to Combined Heat Stress and Central Hypovolemia in Humans
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Abstract
Hyper: 72 ± 9 mmHg, < 0.01) and a greater increase in heart rate (ISO: +12 ± 24 vs. HYPER: +23 ± 17 beats/min, = 0.05) before presyncope. No differences in these variables were observed between conditions in subjects that did not improve LBNP tolerance (all ≥ 0.55). These results suggest that plasma hyperosmolality improves tolerance to central hypovolemia during heat stress in most, but not all, individuals.
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