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Authors J Webster, EJ Holland, G Sleivert, RM Laing, BE Niven
Title   A light-weight cooling vest enhances performance of athletes in the heat
Full source     Ergonomics, 2005, Vol 48, Iss 7, pp 821-837

During the 1990s, emphasis on the health and safety of people who exercise in 
hot, humid conditions increased and many organizations became aware of the need 
for protection against heat-related disorders. A practical, pre-cooling 
strategy applicable to several sporting codes, which is low cost, easy to use, 
light-weight and which enhances cooling of the human body prior to and 
following exercise, was developed and tested. Eight males and eight females 
participated in a maximal oxygen consumption (VO2max) test and four trials: a 
control (without cooling) and wearing each of three different cooling vests (A, 
B, C). Vests were worn during the rest, stretch, warm-up (50% VO2max) and 
recovery stages of the protocol, but not during the 30 min run (70% VO2max). 
Core and skin temperatures during exercise were reduced (by approximately 0.5 
degrees C, rectal; 0.1-1.4 degrees C, abdominal skin temperature) and sweat 
rates were lower (by approximately 10-23%). Endurance times for running at 95% 
of VO2max were increased by up to 49 s. Perceptions of the thermal state and 
skin wetness showed changes to greater levels of satisfaction. Physiological 
and sensory responses were related to design features of the vests.


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