Effect of Carbohydrate Ingestion on Blood Glucose Concentration and Women’s Gymnastics Performance

Abstract

The intent of this study was to report the effect of carbohydrate (CHO) ingestion during a women’s collegiate gymnastics competition on: 1) Blood glucose concentration; 2) Post-competition respiratory exchange ratio; 3) Gymnastics performance score. Thirteen college division three (D III) gymnasts volunteered to participate in a two-trial (placebo and CHO supplement) within-subjects study involving the ingestion of 120 ml of a 6.5% CHO solution and a placebo matched for volume, electrolyte content, color and flavor at 20-minute intervals during pre-season competition. Resting and recovery oxygen consumption (VO2), and respiratory exchange ratio (R-value) were measured using Douglas bag technique. Oxygen consumption was significantly greater during recovery, yet independent of drink. Blood glucose was measured at six time points with fingertip venous blood sample and an Ascensia Contour Monitor. Rate of increase blood glucose was greater with CHO supplementation. Blood glucose was 19% greater in the second and third interval and 21% greater in the fourth interval with CHO. Competition scores were not significantly different between condition, although average floor score was 0.30 better in the carbohydrate (9.17 ± 0.46) than placebo (8.87 ± 0.73) trial. This difference was close to significance (t = 2.035, df = 8, p = .076).