Warm hands cold heart skin#
Linear regression indicated a 1.2% ☌ -1 increase in warm thermosensitivity with whole-body skin cooling. While thermosensitivity to local skin cooling remained unchanged (P = 0.831), sensitivity to skin warming increased significantly at each level of T sk for all skin regions. The cooling protocol resulted in large progressive reductions in T sk, with minimal changes (∼0.08☌) in rectal temperature. On four separate occasions, eight men (27 ± 5 years old) underwent a 30 min whole-body cooling protocol (water-perfused suit temperature, 5☌), during which a quantitative thermosensory test, consisting of reporting the perceived magnitude of warming and cooling stimuli (☘☌ from 30☌ baseline) applied to the hand (palm/dorsum) and foot (sole/dorsum), was performed before cooling and every 10 min thereafter.
Hence, we tested whether progressive decreases in whole-body mean skin temperature (T sk a large conditioning stimulus) alter the magnitude estimation of local warming and cooling stimuli applied to hairy and glabrous skin. Although inhibitory/facilitatory central modulation of vision and pain has been investigated, contextual modulation of skin temperature integration has not been explored. In resembling the central mechanisms underlying endogenous analgesia, our findings point to the existence of an endogenous thermosensory system in humans that could modulate local skin thermal sensitivity to facilitate thermal behaviour. What is the main finding and its importance? Progressive decreases in whole-body mean skin temperature (the conditioning stimulus) significantly increased local thermosensitivity to skin warming but not cooling (the testing stimuli) in a dose-dependent fashion. We asked whether contextual modulation also exists in human temperature integration. What is the central question of this study? Investigations on inhibitory/facilitatory modulation of vision, touch and pain show that conditioning stimuli outside the receptive field of testing stimuli modulate the central processing of visual, touch and painful stimuli.
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