Morris_et_al-2016-The_Journal_of_Physiology.pdf (1.01 MB)
Evidence of viscerally-mediated cold-defence thermoeffector responses in man
journal contribution
posted on 2016-11-24, 09:41 authored by Nathan B. Morris, Davide Filingeri, Mark Halaki, Oliver E. JaySudomotor activity is modified by both warm and cold fluid ingestion during heat stress, independently of differences in core and skin temperatures, suggesting independent viscerally-mediated modification of thermoeffectors. The purpose of the present study was to determine whether visceral thermoreceptors modify shivering responses to cold stress. Ten males (27 ± 5y, 1.73 ± 0.06 m, 78.4 ± 10.7 kg) underwent whole-body cooling via 5 °C water perfusion-suit, on four occasions, to induce a steady-state shivering response, at which point two aliquots of 1.5 ml/kg (SML) and 3.0 ml/kg (LRG), separated by 20- min, of either 7°C, 22°C, 37°C or 52°C water were ingested. Rectal, mean skin and mean body temperature (Tb), electromyographic activity (EMG), metabolic rate (M) and whole-body thermal sensation on a visual analogue scale (WBTS) ranging from 0 mm [very cold] to 200 mm [very hot] were all measured throughout. Tb was not different between all fluid temperatures following SML (7°C:35.7 ± 0.5°C, 22°C:35.6 ± 0.5°C, 37°C:35.5 ± 0.4°C, 52°C:35.5 ± 0.4°C; P = 0.27) or LRG (7°C:35.3 ± 0.6°C, 22°C:35.3 ± 0.5°C, 37°C:35.2 ± 0.5°C, 52°C:35.3 ± 0.5°C; P = 0.99) fluid ingestion. With SML ingestion, greater metabolic rate and cooler thermal sensations were observed with 7°C (M:179 ± 55 W, WBTS:29 ± 21 mm) compared to 52°C (M:164 ± 34 W, WBTS:51 ± 28 mm; all P < 0.05) ingestion. With LRG ingestion, compared to shivering and thermal sensations with 37 °C ingestion (M:215 ± 47 W, EMG:3.9 ± 2.5%MVC, WBTS:33 ± 2 mm) values were different (all P < 0.05) following 7°C (M:269 ± 77 W, EMG:5.5 ± 0.9%MVC, WBTS:14 ± 12 mm), 22°C (M:270 ± 86 W, EMG:5.6 ± 1.0%MVC, WBTS:18 ± 19 mm) and 52°C (M:179 ± 34 W, EMG:3.3 ± 2.1%MVC, WBTS:53 ± 28 mm) ingestion. In conclusion, ingesting 52°C fluids decreased shivering and the sensation of coolness, whereas 22°C and 7°C fluids increased shivering and sensations of coolness to similar levels, independently of core and skin temperature.
Funding
Dr. Filingeri was supported by a Government of Australia - Endeavour Post-Doctoral Research Fellowship. Mr. Morris was supported by a Australian Department of Industry International Postgraduate Research Scholarship.
History
School
- Design and Creative Arts
Department
- Design
Published in
The Journal of PhysiologyVolume
595Issue
4Pages
1201 - 1212Citation
MORRIS, N.B. ... et al, 2017. Evidence of viscerally-mediated cold-defence thermoeffector responses in man. The Journal of Physiology, 595 (4), pp.1201-1212.Publisher
Wiley © The Authors. © The Physiological SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2016-11-02Publication date
2016-12-26Notes
This is the peer reviewed version of the following article: MORRIS, N.B. ... et al, 2017. Evidence of viscerally-mediated cold-defence thermoeffector responses in man. The Journal of Physiology, 595 (4), pp.1201-1212, which has been published in final form at http://dx.doi.org/10.1113/JP273052. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.ISSN
0022-3751eISSN
1469-7793Publisher version
Language
- en