Physiological and thermoregulatory effects of oral taurine supplementation on exercise tolerance during forced convective cooling.

Abstract:

:Abstract We investigated the effects of taurine supplementation on cycling time to exhaustion in cold conditions. Eleven males cycled to exhaustion at a power output equivalent to the mid-point between ventilatory threshold and maximum aerobic power following 15-min rest in the cold (apparent temperature of ∼ 4°C; air flow of 4.17 m s-1). Two hours before, participants ingested taurine (50 mg·kg-1) or placebo beverage. Pulmonary gases, carbohydrate (CHO) and fat oxidation, body temperatures, mean local sweat rate, heart rate, rate of perceived exertion (RPE) and thermal comfort were recorded. Time to exhaustion was not different between trials (taurine = 14.6 ± 4.7 min; placebo = 13.4 ± 5.6 min, P = 0.061, d = 0.27). There were no effects (P > 0.05) of taurine on core temperature, mean skin temperature or local sweat rates. However, the placebo condition showed greater (P < 0.05) reductions in arm-to-finger temperature gradient (i.e. vasodilation) across pre-exercise passive cold exposure and increased CHO oxidation (P < 0.05). Participants also reached a thermally 'comfortable' level quicker in the taurine condition (P < 0.05). A 50 mg·kg-1 dose of taurine did not statistically benefit endurance exercise after moderate cold exposure but conferred some potential vascular and metabolic effects. Highlights In the first study to examine the effects of acute taurine supplementation on exercise performance in cold conditions, we found no significant effects on exercise performance, despite the small effect size. We found preliminary evidence of effects on metabolism during exercise, with taurine supplementation moderately reducing whole-body CHO oxidation rate. Supplementation of taurine also conferred possible skin vascular effects, which was indicative of less vasodilation (or greater sustained vascular tone) when presented with a cold environmental stimulus. Future research should extend these findings to prolonged exercise at colder body temperatures, where the small effects revealed here could have greater influence on human performance and cold tolerability.

journal_name

Eur J Sport Sci

authors

Simmonds R,Cole J,Tallent J,Jeffries O,Theis N,Waldron M

doi

10.1080/17461391.2020.1858175

subject

Has Abstract

pub_date

2020-12-25 00:00:00

pages

1-9

eissn

1746-1391

issn

1536-7290

pub_type

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