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The Journal of Sports Medicine and Physical Fitness 2021 Dec 09

DOI: 10.23736/S0022-4707.21.12770-7


lingua: Inglese

Effect of breathing cooled air during cycling on physiology and performance in the heat

Aidan P. FIOL, Brendon P. McDERMOTT , Chrisitan B. RIDINGS, Nicole E. MOYEN, Matthew S. GANIO, Stavros A. KAVOURAS

Department of Health, Human Performance and Recreation, Human Performance Laboratory, University of Arkansas, Fayetteville, AR, USA


BACKGROUND: To determine the physiological, perceptual, and exercise performance responses to breathing cooled air during and following exercise in the heat.
METHODS: Twelve trained male cyclists (26 ± 4y; 180.5 ± 5.6cm; 56.4 ± 7.5ml/kg/min VO2max) cycled at 60% VO2max for 75min, completed a 5 kilometer (5k) time trial, and recovered for 15min in hot conditions (31°C; 55%RH). Participants completed three separate trials in random order; breathing room air at a 1:4 (1min on:4min off) ratio without ice (control; CON), a 1:4min ratio with ice (low-dose inhalation; LO), and 1:1min ratio with ice (high-dose inhalation; HI). Intestinal temperature (TGI), heart rate (HR), blood pressure (BP), thirst, thermal sensation, rating of perceived exertion (RPE), and inspired air temperature were recorded every 15 minutes during cycling and five minutes during time trial and recovery.
RESULTS: TGI (p=.827), HR (p=.363), physiological strain index (PSI, p= .253), mean arterial pressure (MAP, p=.055) and thirst sensation (p=0.140) were not different between trials. Following the time trial, thermal sensation and RPE were significantly decreased in LO vs CON and HI vs CON (p≤.039). Following the cooldown, thermal sensation was significantly decreased in HI vs CON (p=.006). Five-k time trial differences were not significant between groups (p≥.098).
CONCLUSIONS: Breathing cooled air during cycling in the heat did not provide a significant thermoregulatory or statistically significant performance advantage.

KEY WORDS: Cold-air inhalation; Respiratory heat exchange; Heat stress; Thermoregulation

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