Hand and torso pre-cooling does not enhance subsequent high-intensity cycling or cognitive performance in heat
Maroni, T., Dawson, B., Landers, G., Naylor, L., & Wallman, K. (2019). Hand and torso pre-cooling does not enhance subsequent high-intensity cycling or cognitive performance in heat. Temperature (Austin, Tex.), 7(2), 165–177. https://doi.org/10.z1080/23328940.2019.1631731
Introduction: The purpose of this study was to compare the separate and combined effects of two practical cooling methods (hand and torso) used prior to exercise on subsequent high-intensity cycling performance in heat.
Methods: Ten trained male cyclists (V̇O2peak: 65.7 ± 10.7 ml.kg−1.min−1) performed four experimental trials (randomised within-subjects design) involving 30-min of pre-cooling (20-min seated; PRE-COOL, 10 min warm-up; PRE-COOL+WUP), while using a: (1) hand-cooling glove (CG); (2) cooling jacket (CJ); (3) both CG and CJ (CG+J); or (4) no-cooling (NC) control, followed by a cycling race simulation protocol (all performed in 35.0 ± 0.6°C and 56.6 ± 4.5% RH).
Results: During the 30-min of pre-cooling, no reductions in core (Tc) or mean skin temperature (Tsk) occurred; however, Tsk remained lower in the CJ and CG+J trials compared to NC and CG (p = 0.002–0.040, d= 0.55–1.01). Thermal sensation ratings also indicated that participants felt “hotter” during NC compared to all other trials during both PRE-COOL and PRE-COOL+WUP (p = 0.001–0.015, d= 1.0–2.19), plus the early stages of exercise (sets 1–2; p = 0.005–0.050, d= 0.56–1.22). Following cooling, no differences were found for absolute Tc and Tsk responses between trials over the entire exercise protocol (p > 0.05). Exercise and cognitive (working memory) performance also did not differ between trials (p = 0.843); however, cognitive performance improved over time in all trials (p < 0.001).
Conclusion: In summary, pre-cooling (20-min seated and 10-min warm-up) in heat did not improve subsequent high-intensity cycling performance, cognitive responses and associated thermoregulatory strain (Tc and Tsk) compared to control.
Keywords: Core temperature, thermoregulation, hand cooling, cooling jacket, thermal sensation, working memory
In Simple Terms:
This study looked at whether cooling the hands, torso, or both before cycling in the heat could improve performance. Even though people felt less hot with cooling, it didn’t lower body temperature or help with cycling or memory tasks. All cooling methods had similar results to no cooling. Pre-cooling didn’t make a difference in performance.
Uploaded by Braeden Ostepchuk, creator of the CEU-approved course 0th Law of Physiology, co-founder of Kuhler Technologies, and inventor of Kühler.