Fig. 3.

Cutaneous vascular conductance (CVC) at normothermia, heat stress, and the final 100 s before the end of the orthostatic challenge due to syncopal symptoms. Data are normalized relative to CVC just before the onset of the orthostatic challenge. Absolute CVC values are as follows: normothermia, 29 ± 20; heat stress, 160 ± 58; and end of orthostatic stress, 138 ± 61 CVC units. Heat stress increased CVC by ∼5-fold. LBNP/upright tilt caused relatively minor, but significant, reductions in CVC that persisted until the end of the orthostatic challenge, with CVC at test termination being 88 ± 21% of CVC before the orthostatic challenge. *Significantly different from normothermia; ¥significantly different from heat stress.