Abstract
It has been suggested that acute quercetin supplementation may have beneficial effects during prolonged exercise. Quercetin has also been shown to elicit positive effects on cognition in animal studies. PURPOSE: To identify the effects of acute quercetin supplementation on cognitive function during prolonged exercise in a hot environment. METHODS: 15 males (Age = 22.1±0.5 years; Wt: 79.6±3.0 kg; Ht: Wt: 178.0±2.0 cm; VO2Peak = 43.9±1.4 ml.kg-1.min-1) completed 3 exercise trials. During the first trial, subjects completed a graded exercise test (GXT) on a recumbent cycle ergometer in a normal environment (22°C and 50% humidity). Ventilatory threshold (VT) was determined using the results of the GXT. During the second and third trials, subjects completed 2 exercise sessions in a hot environment (32oC and 70% humidity). During these sessions, the participants completed 2 hrs of exercise on a Monark cycle ergometer at 60% of VT. Sixty minutes prior to these trials, subjects consumed either 4 soft chews containing 1000 mg quercetin (Q) or a color and taste matched placebo (P). During each session, subjects drank water (5 ml.kg-1 body weight) every 30 minutes to maintain hydration status. Subjects completed a cognitive assessment battery (CAB) before exercise and at the following times during exercise: 5 minutes, 45 minutes, and 105 minutes. The CAB included tests designed to assess grammatical reasoning (GR), code substitution (CS), math processing (MP), and tapping (TP). RESULTS: Reaction time during GR, CS, and MP improved (p<0.02) as a result of exercise. Similarly, the number of correct answers during MP improved (p=0.003) as a result of exercise (Rest=23.9+1.0; 5 min=27.0+0.9; 45 min=27.8+0.9; 105 min=29+1.0). Performance of the TP task was unchanged as a result of exercise. Q supplementation did not influence cognitive function at any time point. CONCLUSIONS: The results of this investigation suggest that acute Q supplementation of this magnitude (1000 mg) does not influence cognitive function during prolonged exercise in the heat.
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