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- Title
Carbohydrate Loading and Female Endurance Athletes: Effect of Menstrual-Cycle Phase.
- Authors
McLay, Rebecca T.; Thomson, Christine D.; Williams, Sheila M.; Rehrer, Nancy J.
- Abstract
This study compared 3 d of carbohydrate loading (CHOL; 8.4 g⋅kg-1⋅d-1 carbohydrate) in female eumenorrheic athletes with 3 d of an isoenergetic normal diet (NORM; 5.2 g⋅kg-1⋅d-1 carbohydrate) and examined the effect of menstrual-cycle phase on performance, muscle-glycogen concentration [glyc], and substrate utilization. Nine moderately trained eumenorrheic women cycled in an intermittent protocol varying in intensity from 45% to 75% VO2max for 75 min, followed by a 16-km time trial at the midfollicular (MF) and midluteal (ML) phases of the menstrual cycle on NORM and CHOL. Time-trial performance was not affected by diet (CHOL 26.10 ± 1.04 min, NORM 26.16 ± 1.35 min; P = 0.494) or menstrual-cycle phase (MF 26.05 ± 1.10 min, ML 26.23 ± 1.33 min; P = 0.370). Resting [glyc] was lowest in the MF phase after NORM (575 ± 145 mmol⋅kg-1⋅dw-1), compared with the MF phase after CHOL (728 mmol⋅kg-1⋅dw-1) and the ML phase after CHOL and NORM (756 and 771 mmol⋅kg-1⋅dw-1, respectively). No effect of phase on substrate utilization during exercise was observed. These data support previous observations of greater resting [glyc] in the ML than the MF phase of the menstrual cycle and suggest that lower glycogen storage in the MF phase can be overcome by carbohydrate loading.
- Subjects
CARBOHYDRATES; CARBOHYDRATE metabolism; WOMEN athletes; GLYCOGEN; MENSTRUAL cycle; ATHLETES; EXERCISE physiology
- Publication
International Journal of Sport Nutrition & Exercise Metabolism, 2007, Vol 17, Issue 2, p189
- ISSN
1526-484X
- Publication type
Article
- DOI
10.1123/ijsnem.17.2.189