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ABSTRACT  The purpose of this double‐blinded, crossover randomized and counterbalanced study was to compare the effects of ingesting a tepid commercially available carbohydrate–menthol‐containing sports drink (menthol) and an isocaloric carbohydrate‐containing sports drink (placebo) on thermal perception and cycling endurance capacity “in a simulated home virtual cycling environment”. It was hypothesized that the addition of menthol would improve indicators of thermal perception and improve endurance exercise capacity. Twelve healthy, endurance‐trained males (age 29 ± 5 years, height 181 ± 6 cm, body mass 79 ± 2 kg and V̇O 2 max 57.3 ± 6.4 mL kg −1  min −1 ) completed two experimental trials on a stationary bicycle without external air flow. Each trial consisted of (1) cycling for 60 min at 90% of the first ventilatory threshold while receiving a fixed amount of menthol or placebo every 10 min followed immediately by (2) cycling until volitional exhaustion (TTE) at 105% of the intensity corresponding to the respiratory compensation point. TTE did not differ between both conditions (541 ± 177 and 566 ± 150 s for menthol and placebo;  p  &gt; 0.05) and neither did ratings of perceived thermal comfort or thermal sensation ( p  &gt; 0.05). Also, the rectal temperature at the end of TTE was comparable between menthol and placebo trials (38.7 ± 0.2°C and 38.7 ± 0.3°C, respectively;  p  &gt; 0.05). The present results demonstrate that the addition of menthol to commercially available sports drink does not improve thermal comfort or endurance exercise capacity during ∼65 min of intense virtual cycling.   HighlightsIngestion of a commercially available carbohydrate–menthol beverage at high exercise intensity and without air flow does not improve endurance exercise capacity.  When ingested with carbohydrates, it appears that a combination of carbohydrates and menthol does not improve thermal discomfort caused by intense exercise and a lack of air flow.  A menthol concentration higher than 0.01% might be required to induce the reduction in thermal discomfort when ingested in combination with carbohydrates.

Commercially available carbohydrate drink with menthol fails to improve thermal perception or cycling exercise capacity in males