The Effect of Preexercise Carbohydrate Status on Resistance Exercise Performance

in International Journal of Sport Nutrition and Exercise Metabolism
Restricted access

Purchase article

USD $24.95

Student 1 year subscription

USD $87.00

1 year subscription

USD $116.00

Student 2 year subscription

USD $165.00

2 year subscription

USD $215.00

The purpose of this study was to determine the effect of a high vs. a low preexercise carbohydrate (CHO) diet on performance during multiple sets of resistance exercise. Eleven resistance-trained males performed cycle ergometry to deplete quadriceps muscle glycogen stores, followed by 48 hr of a high (HICHO) or a low (LOCHO) CHO diet. Subjects then performed five sets each of squats, leg presses, and knee extensions (resistance = 15 RM) to failure. Blood samples were taken before and during exercise for determination of glucose and lactate (LA). No differences in performance (repetitions X weight lifted) were observed (HICHO = 15,975±1,381 and LOCHO = 15,723±1,231 kg). Blood glucose was significantly higher after exercise for HICHO compared to LOCHO (HICHO = 4.8 ± 0.2 vs. LOCHO = 3.9 ± 0.2 mmol·L−1). No differences in LA accumulation were observed. The data indicated that preexercise CHO status did not affect resistance exercise performance. Further, the differences in blood glucose and the similarity in LA responses suggest that glycolysis was maintained in the LOCHO condition, and there may have been an increased reliance on blood glucose when preexercise CHO status was low.

The authors are with the Exercise Physiology Laboratory, Texas Christian University, Fort Worth, TX 76129.

International Journal of Sport Nutrition and Exercise Metabolism

Article Metrics

All Time Past Year Past 30 Days
Abstract Views 10 10 7
Full Text Views 1 1 1
PDF Downloads 1 1 1

Altmetric Badge

PubMed

Google Scholar

Cited By