Figure 3.

Effect of whole-body passive heat stress on MSNA burst frequency and burst incidence in healthy young and aged subjects

Muscle sympathetic nerve activity burst frequency (left panel) and burst incidence (right panel) at normothermic baseline and during whole-body passive heat stress sufficient to elevate core temperature by 0.6°C (+0.6°C) and 1.2°C (+1.2°C) in healthy young (n = 11) and aged (n = 10) subjects. Values are mean ± 95% confidence intervals. ^*Significantly different from baseline (P ≤ 0.05). ^†Significantly different between young and aged (P ≤ 0.05).