Abstract
0161 Purpose: To examine the effects of peripheral cooling via the rapid thermal exchange (RTX) cooling device (Avacore Technologies inc.) on whole body substrate oxidation during exercise at a moderate ambient temperature (28°C). Methods: Subjects (N = 16) completed two 45-minute cycle ergometer trials at 90% of ventilatory threshold (VT) with RTX peripheral cooling and without (CON). Rectal temperature was continuously recorded throughout both trials. VO2 and VCO2 were monitored to compute whole body substrate oxidation. significance was set at p < 0.05. Results: Despite no differences in rectal temperature between trials, mean CHO oxidation was lower during RTX (1453 ± 299 kJ) versus CON (1546 ± 291 kJ). Conversely, mean fat oxidation was higher during RTX (719 ± 248 kJ) versus CON (610 ± 197 kJ). HR and RPE were similar between trials. Conclusion: These data indicate the RTX device promotes a decrease in whole body carbohydrate (CHO) reliance despite no difference in rectal temperature. Supported by AVAcore Technologies, Inc
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