medicina Article Chemically Activated Cooling Vest’s Effect on Cooling Rate Following Exercise-Induced Hyperthermia: A Randomized Counter-Balanced Crossover Study Yuri Hosokawa 1,* , Luke N. Belval 2 , William M. Adams 3 , Lesley W. Vandermark 4 and Douglas J. Casa 5 1 Faculty of Sport Sciences, Waseda University, Saitama 359-1192, Japan 2 Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas and University of Texas Southwestern Medical Center, Dallas, TX 75231, USA;
[email protected] 3 Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, NC 27412, USA;
[email protected] 4 Department of Health, Human Performance, and Recreation, University of Arkansas, Fayetteville, AR 72701, USA;
[email protected] 5 Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA;
[email protected] * Correspondence:
[email protected] Received: 26 August 2020; Accepted: 9 October 2020; Published: 14 October 2020 Abstract: Background and objectives: Exertional heat stroke (EHS) is a potentially lethal, hyperthermic condition that warrants immediate cooling to optimize the patient outcome. The study aimed to examine if a portable cooling vest meets the established cooling criteria (0.15 C min 1 or greater) ◦ · − for EHS treatment. It was hypothesized that a cooling vest will not meet the established cooling criteria for EHS treatment. Materials and Methods: Fourteen recreationally active participants (mean SD; male, n = 8; age, 25 4 years; body mass, 86.7 10.5 kg; body fat, 16.5 5.2%; body surface ± ± ± ± area, 2.06 0.15 m2. female, n = 6; 22 2 years; 61.3 6.7 kg; 22.8 4.4%; 1.66 0.11 m2) ± ± ± ± ± exercised on a motorized treadmill in a hot climatic chamber (ambient temperature 39.8 1.9 C, ± ◦ relative humidity 37.4 6.9%) until they reached rectal temperature (T ) >39 C (mean T , ± RE ◦ RE 39.59 0.38 C).