Skin sympathetic nerve activity onset threshold

1. Hot water immersion decreases skin sympathetic nerve activity onset threshold in humans (-0.19°C [-0.36, -0.02], P = 0.024).

   “Post-acclimation, the onset threshold of SSNA (-0.19°C [-0.36, -0.02], P = 0.024), LSR (-0.15°C [-0.29, 0.00], P = 0.036), and CVC (-0.23°C [-0.41, -0.06], P = 0.009) was reduced in older adults”

   Human trialhot water immersionseven consecutive daysn = 15

   Heat acclimation improves the neural control of body temperature during heat stress in older adults

   The Journal of physiology·11 May 2026

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