Hemodynamic responses upon the initiation of thermoregulatory behavior in young healthy adults

Schlader, Zachary J.; Sarker, Suman; Mündel, Toby; Coleman, Gregory L.; Chapman, Christopher L.; Sackett, James R.; Johnson, Blair D.

doi:10.1080/23328940.2016.1148938

Cited by 18 publications

(34 citation statements)

References 67 publications

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“…) and perceptions of sweating and shivering (to the nearest 0.5; 0 = none and 10 = most ever; Schlader et al . ) were measured on subjective scales.…”

Section: Methodsmentioning

confidence: 99%

“…During the baseline period, subjects were read an instructional script that reviewed the experimental procedures and instructed them to exit the warm room when they became ‘too warm’ and exit the cool room when they became ‘too cool’ (Schlader et al . , , ). This ‘shuttle box’ thermal behavioural model provides a reliable index of thermoregulatory behaviour in humans (Schlader et al .…”

Section: Methodsmentioning

confidence: 99%

“…We have recently identified low levels of perceived sweating and shivering upon the decision to behave in warm (40°C) and cool (17°C) environments (Schlader et al . ). Interestingly, such perceptual responses were present despite skin temperatures that, in the absence of changes in internal temperature, are not typically associated with the activation of these autonomic thermoeffectors (e.g.…”

Section: Introductionmentioning

confidence: 97%

“…36.1 ± 0.5 and 33.5 ± 0.7°C; Schlader et al . ). Whether shivering or sweating preceded the initiation of thermal behaviour despite these modest changes in skin temperature is unknown.…”

Section: Introductionmentioning

confidence: 97%

“… a ), which is largely brought about by changes in skin temperature, preventing deviations in internal temperature (Schlader et al . , , ). This arrangement appears to minimize, but not prevent, sweating or shivering (Schmidt, ; Gordon, ; Schlader et al .…”

Section: Introductionmentioning

confidence: 99%

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Activation of autonomic thermoeffectors preceding the decision to behaviourally thermoregulate in resting humans

Schlader

Coleman

Sackett

et al. 2016

Experimental Physiology

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New Findings r What is the central question of this study?Do increases in metabolic heat production and sweat rate precede the initiation of thermoregulatory behaviour in resting humans exposed to cool and warm environments? r What is the main finding and its importance?Thermoregulatory behaviour at rest in cool and warm environments is preceded by changes in vasomotor tone in glabrous and non-glabrous skin, but not by acute increases in metabolic heat production or sweat rate. These findings suggest that sweating and shivering are not obligatory for thermal behaviour to be initiated in humans.We tested the hypothesis that acute increases in metabolic heat production and sweating precede the initiation of thermoregulatory behaviour in resting humans exposed to cool and warm environments. Twelve healthy young subjects passively moved between 17 and 40°C rooms when they felt 'too cool' (C→W) or 'too warm' (W→C). Skin and internal (intestinal) temperatures, metabolic heat production, local sweat rate (forearm and chest) and cutaneous vascular conductance (CVC; forearm and fingertip) were measured continually. Compared with pretest baseline (31.8 ± 0.3°C), skin temperature was higher at C→W (32.0 ± 0.7°C; P = 0.01) and W→C (34.5 ± 0.5°C; P < 0.01). Internal temperature did not differ (P = 0.12) between baseline (37.2 ± 0.3°C), C→W (37.2 ± 0.3°C) and W→C (37.0 ± 0.3°C). Metabolic heat production was not different from baseline (40 ± 9 W m −2 ) at C→W (39 ± 7 W m −2 ; P = 0.50). Forearm (0.06 ± 0.01 mg cm −2 min −1 ) and chest (0.04 ± 0.02 mg cm −2 min −1 ) sweat rate at W→C did not differ from baseline (forearm, 0.05 ± 0.02 mg cm −2 min −1 and chest, 0.04 ± 0.02 mg cm −2 min −1 ; P ࣙ 0.23). Forearm CVC was not different from baseline (0.30 ± 0.21 perfusion units (PU) mmHg −1 ) at C→W (0.24 ± 0.11 PU mmHg −1 ; P = 0.17), but was higher at W→C (0.65 ± 0.33 PU mmHg −1 ; P < 0.01). Fingertip CVC was different from baseline (2.6 ± 2.0 PU mmHg −1 ) at C→W (0.70 ± 0.42 PU mmHg −1 ; P < 0.01) and W→C (4.49 ± 1.66 PU mmHg −1 ; P < 0.01). Thermoregulatory behaviour at rest in cool and warm environments is preceded by changes in vasomotor tone in glabrous and non-glabrous skin, but not by acute increases in metabolic heat production or sweat rate.

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“…) and perceptions of sweating and shivering (to the nearest 0.5; 0 = none and 10 = most ever; Schlader et al . ) were measured on subjective scales.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

“…36.1 ± 0.5 and 33.5 ± 0.7°C; Schlader et al . ). Whether shivering or sweating preceded the initiation of thermal behaviour despite these modest changes in skin temperature is unknown.…”

Section: Introductionmentioning

confidence: 97%