Oral L-menthol reduces thermal sensation, increases work-rate and extends time to exhaustion, in the heat at a fixed rating of perceived exertion

European Journal of Applied Physiology
T R FloodO Jeffries

Abstract

The study investigated the effect of a non-thermal cooling agent, L-menthol, on exercise at a fixed subjective rating of perceived exertion (RPE) in a hot environment. Eight male participants completed two trials at an exercise intensity between 'hard' and 'very hard', equating to 16 on the RPE scale at ~35 °C. Participants were instructed to continually adjust their power output to maintain an RPE of 16 throughout the exercise trial, stopping once power output had fallen by 30%. In a randomized crossover design, either L-menthol or placebo mouthwash was administered prior to exercise and at 10 min intervals. Power output, [Formula: see text]O2, heart rate, core and skin temperature was monitored, alongside thermal sensation and thermal comfort. Isokinetic peak power sprints were conducted prior to and immediately after the fixed RPE trial. Exercise time was greater (23:23 ± 3:36 vs. 21:44 ± 2:32 min; P = 0.049) and average power output increased (173 ± 24 vs. 167 ± 24 W; P = 0.044) in the L-menthol condition. Peak isokinetic sprint power declined from pre-post trial in the L-menthol l (9.0%; P = 0.015) but not in the placebo condition (3.4%; P = 0.275). Thermal sensation was lower in the L-menthol condition (P = 0.036), despit...Continue Reading

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Citations

Apr 10, 2018·Current Sports Medicine Reports·Tessa Rose Flood
Sep 7, 2018·Journal of Occupational and Environmental Medicine·Emily SchlichtStephen J Ives
Dec 31, 2019·Scandinavian Journal of Medicine & Science in Sports·Jacinta M SaldarisBrendan S Lay
Feb 15, 2020·European Journal of Sport Science·Teng Keen KhongAshril Yusof
May 18, 2020·European Journal of Nutrition·Russ BestCraig Pickering
Jan 12, 2021·European Journal of Applied Physiology·Edward Tom AshworthAndrew Edward Kilding
Mar 5, 2021·International Journal of Sports Physiology and Performance·Erica H GavelScott G Thomas
Jun 3, 2021·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nicholas RavanelliDaniel Gagnon
Jul 27, 2021·Frontiers in Nutrition·Erica H GavelHeather M Logan-Sprenger
Nov 20, 2021·European Journal of Applied Physiology·Sophie H KroesenThijs M H Eijsvogels
Dec 21, 2019·Journal of Strength and Conditioning Research·Joshua L KellerGlen O Johnson

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