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Title: Reduction of physiological strain under a hot and humid environment by a hybrid cooling vest
Authors: Chan, APC 
Yang, Y 
Wong, FKW 
Yam, MCH 
Wong, DP
Song, WF
Issue Date: May-2019
Source: Journal of strength and conditioning research, May 2019, v. 33, no. 5, p. 1429-1436
Abstract: Cooling treatment is regarded as one of good practices to provide safe training conditions to athletic trainers in the hot environment. The present study aimed to investigate whether wearing a commercial lightweight and portable hybrid cooling vest that combines air ventilation fans with frozen gel packs was an effective means to reduce participants’ body heat strain. In this within-subject repeated measures study, 10 male volunteers participated in two heat-stress trials (one with the cooling vest – COOL condition, and another without – CON condition, in a randomized order) inside a climatic chamber with a controlled ambient temperature 33 °C and relative humidity (RH) 75% on an experimental day. Each trial included a progressively incremental running test, followed by a 40 min post-exercise recovery. Core temperature (Tc), heart rate (HR), sweat rate, rating of perceived exertion (RPE), exercise duration, running distance, power output, and sweat rate were measured. When comparing the two conditions, a non-statistically significant moderate cooling effect in rate of increase in Tc (0.03±0.02 °C/min for COOL vs. 0.04±0.02 °C/min for CON, p=0.054, d=0.57), HR (3±1 bpm/min for COOL vs. 4±1 bpm/min for CON, p=0.229, d=0.40), and physiological strain index (PSI) (0.20±0.06 unit/min for COOL vs. 0.23±0.06 unit/min for CON, p=0.072, d=0.50) was found in the COOL condition during exercise. A non-statistically significant (p>0.05) trivial cooling effect (d<0.2) was observed between the COOL and CON conditions for measures of exercise duration, running distance, power output, sweat rate and RPE. It is concluded that the use of the hybrid cooling vest achieved a moderate cooling effect in lowering the rate of increase in physiological strain without impeding the performance of progressively incremental exercise in the heat.
Keywords: Effect size
Physiological strain
Training conditions
Publisher: Lippincott Williams & Wilkins
Journal: Journal of strength and conditioning research 
ISSN: 1064-8011
DOI: 10.1519/JSC.0000000000001837
Rights: © 2017 National Strength and Conditioning Association
Posted with permission of the publisher.
This is an Author's Accepted Manuscript of an article published in Chan, Albert P.C.; Yang, Yang; Wong, Francis K.W.; Yam, Michael C.H.; Wong, Del P.; Song, Wen-Fang Reduction of Physiological Strain Under a Hot and Humid Environment by a Hybrid Cooling Vest, Journal of Strength and Conditioning Research: May 2019 - Volume 33 - Issue 5 - p 1429-1436, the open URL of the article: https://dx.doi.org/10.1519/JSC.0000000000001837
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