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J Appl Physiol 88: 2151-2158, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 6, 2151-2158, June 2000

Dietary carbohydrate, muscle glycogen content, and endurance performance in well-trained women

J. Lynne Walker1, George J. F. Heigenhauser2, Eric Hultman3, and Lawrence L. Spriet1

1 Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, Ontario N1G 2W1; 2 Department of Medicine, McMaster University, Hamilton, Ontario, Canada L8N 3Z5; and 3 Division of Clinical Chemistry, Huddinge University Hospital, Huddinge S-141 86, Sweden

This study examined the ability of well-trained eumenorrheic women to increase muscle glycogen content and endurance performance in response to a high-carbohydrate diet (HCD; ~78% carbohydrate) compared with a moderate-carbohydrate diet (MD; ~48% carbohydrate) when tested during the luteal phase of the menstrual cycle. Six women cycled to exhaustion at ~80% maximal oxygen uptake (VO2 max) after each of the randomly assigned diet and exercise-tapering regimens. A biopsy was taken from the vastus lateralis before and after exercise in each trial. Preexercise muscle glycogen content was high after the MD (625.2 ± 50.1 mmol/kg dry muscle) and 13% greater after the HCD (709.0 ± 44.8 mmol/kg dry muscle). Postexercise muscle glycogen was low after both trials (MD, 91.4 ± 34.5; HCD, 80.3 ± 19.5 mmol/kg dry muscle), and net glycogen utilization during exercise was greater after the HCD. The subjects also cycled longer at ~80% VO2 max after the HCD vs. MD (115:31 ± 10:47 vs. 106:35 ± 8:36 min:s, respectively). In conclusion, aerobically trained women increased muscle glycogen content in response to a high-dietary carbohydrate intake during the luteal phase of the menstrual cycle, but the magnitude was smaller than previously observed in men. The increase in muscle glycogen, and possibly liver glycogen, after the HCD was associated with increased cycling performance to volitional exhaustion at ~80% VO2 max.

eumenorrhea; luteal phase; glycogen loading; muscle glycogen supercompensation


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