| Autor: |
Santana O; Human Performance Research Group, Federal University of Technology Parana, Curitiba, Brazil., Vieira-Cavalcante V; Human Performance Research Group, Federal University of Technology Parana, Curitiba, Brazil., Caetano Paulo A; Physical and Sports Training, Health and Performance Research Group (TFESP), Federal University of Technology Parana, Curitiba, Brazil., Rodacki C; Human Performance Research Group, Federal University of Technology Parana, Curitiba, Brazil.; Physical and Sports Training, Health and Performance Research Group (TFESP), Federal University of Technology Parana, Curitiba, Brazil., Bertuzzi R; Endurance Performance Research Group (GEDAE-USP), University of Sao Paulo, Sao Paulo, Brazil., Lima-Silva AE; Human Performance Research Group, Federal University of Technology Parana, Curitiba, Brazil., Cristina-Souza G; Human Performance Research Group, Federal University of Technology Parana, Curitiba, Brazil.; Nutrition and Exercise Research Group, State University of Minas Gerais, Minas Gerais, Brazil. |
| Abstrakt: |
The aim of this study was to compare the effects of caffeine ingestion on muscular performance during the early-follicular and mid-luteal phases of the menstrual cycle. Fourteen resistance-trained naturally menstruating women performed countermovement jump (CMJ), maximal voluntary isometric contraction (MVIC), one-repetition maximum (1-RM), and repetitions-to-failure (RF) at 80% of 1-RM in the half-squat exercise, in early-follicular and mid-luteal phases, after placebo or caffeine ingestion. The early-follicular and mid-luteal phases were identified via calendar-based counting method. The MVIC was lower in the early-follicular than mid-luteal phase (-6.2 ± 15.2 N, p < 0.05) and higher with caffeine than placebo ingestion regardless of the menstrual cycle phase (+16.8 ± 26.7 N, p < 0.05). The magnitude of gains (supplement x phase interaction, p < 0.026) in 1-RM, CMJ, and RF with caffeine ingestion was higher in the early-follicular (+16.6 ± 7.1 kg, +2.5 ± 1.6 cm, and +4.5 ± 2.6 repetitions, respectively) than in the mid-luteal phase (+7.7 ± 4.8 kg, +1.5 ± 2.0 cm, and +2.4 ± 3.1 repetitions, respectively). In conclusion, the greater ergogenic effect of caffeine during the early-follicular phase supports its use to mitigate the decline in muscular performance in this phase of the menstrual cycle. |
