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• W2801009096 abstract "The effects of menstrual phase on athletic performance are controversial, but commonly ascribed to temperature-related impairments in physical and cognitive performances. Caffeine stimulates the CNS to enhance endurance performance, and while effects persist for men exercising in the heat, little work has been done with women. Moreover, many female athletes use oral contraceptive steroids (OCS) to regulate their menstrual cycles, which may pronounce the effects of caffeine. The purpose of this study was to evaluate the effects of menstrual phase and caffeine supplementation on physical and cognitive performances of women exercising in the heat. Six recreationally active female subjects (20.3 ± 1.6 yr, 1.67 ± 0.05 m, 69.3 ± 5.5 kg, 49.8 ± 3.3 ml·kg−1·min−1) concurrently taking monophasic OCS volunteered for this study. Each subject completed four trials: in the early follicular (EF, days 3–5) and midfollicuar (MF, days 19–21) phases of the menstrual cycle, after administration of either a placebo (P, corn starch) or caffeine (C, 5.5 mg/kg). Placebo and caffeine were administered in 355 mL “diet” cranberry drink (0 kcal), 1 hour prior to performing a self-paced 5km time trial (TT) in the heat (29.6 ± 0.1°C, 55.8 ± 1.5 % relative humidity). Heart rate was recorded continuously and RPE was collected at 1-km intervals. Oral temperature, Profile of Mood States (POMS) questionnaires and 2 tests of reaction and cognition (FitLight) were performed immediately prior to and following exercise. Time trial performance was improved in the EF-C trial vs. EF-P, ML-C and ML-P (1883 ± 203 vs. 1918 ± 224, 1898 ± 196, 1907 ± 205 seconds). Oral temperature tended to be elevated post-TT in EF-C vs. all other trials (37.4 vs. ~37.0 °C), while HR AUC tended to be decreased in the EF trials (5404 ± 167 vs. 5544 ± 181 beats, p = 0.09). The POMS Fatigue index was significantly higher post-TT in the ML-C trial (15.0 ± 1.9 vs 12.7 ± 0.4, 10.8 ± 1.1, ±11.2 ± 1.0). RPE and cognitive test responses were not different between trials. In heat stress, caffeine improves time trial performance in the EF phase despite an increased post-exercise oral temperature. While heart rate response tended to be lower in the EF phase, no differences were observed in any other physical or cognitive performance measure between trials. Support or Funding Information Scotia Scholars Award, Nova Scotia Health Research Foundation This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal." @default.
• W2801009096 created "2018-05-17" @default.
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• W2801009096 date "2018-04-01" @default.
• W2801009096 modified "2023-09-26" @default.
• W2801009096 title "Effects of Caffeine and Menstrual Phase on Performance of Female Athletes during Heat Stress" @default.
• W2801009096 doi "https://doi.org/10.1096/fasebj.2018.32.1_supplement.lb262" @default.
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