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Evaluation of Various Cooling Systems After Exercise-Induced Hyperthermia.

Abstract：

CONTEXT:Rapid diagnosis and expeditious cooling of individuals with exertional heat stroke is paramount for survival. OBJECTIVE:To evaluate the efficacy of various cooling systems after exercise-induced hyperthermia. DESIGN:Crossover study. SETTING:Laboratory. PATIENTS OR OTHER PARTICIPANTS:Twenty-two men (age = 24 ± 2 years, height = 1.76 ± 0.07 m, mass = 70.7 ± 9.5 kg) participated. INTERVENTION(S):Each participant completed a treadmill walk until body core temperature reached 39.50°C. The treadmill walk was performed at 5.3 km/h on an 8.5% incline for 50 minutes and then at 5.0 km/h until the end of exercise. Each participant experienced 4 cooling phases in a randomized, repeated-crossover design: (1) no cooling (CON), (2) body-cooling unit (BCU), (3) EMCOOLS Flex.Pad (EC), and (4) ThermoSuit (TS). Cooling continued for 30 minutes or until body core temperature reached 38.00°C, whichever occurred earlier. MAIN OUTCOME MEASURE(S):Body core temperature (obtained via an ingestible telemetric temperature sensor) and heart rate were measured continuously during the exercise and cooling phases. Rating of perceived exertion was monitored every 5 minutes during the exercise phase and thermal sensation every minute during the cooling phase. RESULTS:The absolute cooling rate was greatest with TS (0.16°C/min ± 0.06°C/min) followed by EC (0.12°C/min ± 0.04°C/min), BCU (0.09°C/min ± 0.06°C/min), and CON (0.06°C/min ± 0.02°C/min; P < .001). The TS offered a greater cooling rate than all other cooling modalities in this study, whereas EC offered a greater cooling rate than both CON and BCU (P < .0083 for all). Effect-size calculations, however, showed that EC and BCU were not clinically different. CONCLUSION:These findings provide objective evidence for selecting the most effective cooling system of those we evaluated for cooling individuals with exercise-induced hyperthermia. Nevertheless, factors other than cooling efficacy need to be considered when selecting an appropriate cooling system.

journal_name

J Athl Train

journal_title

Journal of athletic training

authors

Tan PM,Teo EY,Ali NB,Ang BC,Iskandar I,Law LY,Lee JK

doi

10.4085/1062-6050-52.1.11

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

108-116

issue

eissn

1062-6050

issn

1938-162X

journal_volume

pub_type

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Evaluation of Various Cooling Systems After Exercise-Induced Hyperthermia.