A light-weight cooling vest enhances performance of athletes in the heat

Abstract

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 ([Vdot]O_2max) 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% [Vdot]O_2max) and recovery stages of the protocol, but not during the 30 min run (70% [Vdot]O_2max). Core and skin temperatures during exercise were reduced (by approximately 0.5°C, rectal; 0.1 – 1.4°C, abdominal skin temperature) and sweat rates were lower (by approximately 10 – 23%). Endurance times for running at 95% of [Vdot]O_2max 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.

Keywords:

• Human performance
• Health and safety
• Exercise
• Sport
• Thermophysiology

Acknowledgements

Assistance from the following is gratefully acknowledged: Ms V. Burke, Ms R. Bell and Mrs D. Wilson, Human Performance Centre and Ms T. Lemmon, Clothing and Textiles Centre, University of Otago, for technical assistance; Sports Science New Zealand Ltd for financial support.

Notes

Declaration of interest

The authors declare an interest such that the University of Otago maintains a proprietary interest in the commercial development of one cooling vest developed as part of this study.

Additional information

Notes on contributors

J Webster

Declaration of interest The authors declare an interest such that the University of Otago maintains a proprietary interest in the commercial development of one cooling vest developed as part of this study.