King Grub
2020-06-01, 12:44
Background
The positive effects of carbohydrate supplementation and aerobic exercise has been studied extensively over the past century. There have been few studies that view changes in performance and recovery responses to carbohydrate supplementation with exhaustive resistance exercise. Therefore, the purpose of this study was to investigate how carbohydrate influences resistance exercise performance.
Materials and Methods
Ten apparently healthy male individuals with at least a year of resistance exercise experience were recruited for this study. The mean (±SD) age, mass, and body fat percentage was 21 (±2.27) years, 90.4 (±19.3) kg, and 20 (±8.5) %, respectively. The first visit consisted of baseline preliminary test to determine 1-RM on angled leg press, a 30 min recovery, followed by four sets of reps to fatigue protocol at 70% of that 1-RM. The reps to fatigue protocol consisted of four sets to failure separated by 45 s of rest. Foot positioning and knee angle ROM were standardized for each participant for each visit. For visits 2 and 3, participants were divided in a randomized, double-blind, cross-over experimental design, participants completed the same reps to fatigue bout after ingesting either placebo or carbohydrate. At the start of each visit, participants ingested either a maltodextrin carbohydrate supplement at 2 g/kg body mass or non-caloric, identically-tasting placebo, and waited 30 min before completing the four sets of reps to fatigue. A 2x4 repeated measures ANOVA and a pair samples t-test were conducted at a significance level of p < .05.
Results
No significant difference in total reps to fatigue (t(9)=-1.47, p = .174) was found between placebo 53.8 (±7.8) vs. 51.8 (±6.9) carbohydrate conditions. No significant difference in reps completed was seen between conditions within each individual set (F(1, 9)= 2.169, p = .175, η2 = .194). However, there was a significant difference in reps completed between sets for both conditions (F(3, 9)= 126.1, p < .001, η2 = .933). Pairwise comparisons indicated that there was a significant decrease in reps completed between all sequential sets in both conditions, except sets 3 and 4 (p = .212).
Conclusions
Carbohydrate did not appear to have any effect on resistance exercise performance when completed to fatigue. Similarly, carbohydrate consumption did not alter recovery between sets which is indicated by the total reps to fatigue within each set being identical between conditions. This indicates that carbohydrate did not have any impact on performance or acute inter-set recovery during the exhaustive resistance exercise bout.
Proceedings of the Sixteenth International Society of Sports Nutrition (ISSN) Conference and Expo. A34 Effects of Carbohydrate Supplementation on Resistance Exercise Performance and Index of Fatigue.
The positive effects of carbohydrate supplementation and aerobic exercise has been studied extensively over the past century. There have been few studies that view changes in performance and recovery responses to carbohydrate supplementation with exhaustive resistance exercise. Therefore, the purpose of this study was to investigate how carbohydrate influences resistance exercise performance.
Materials and Methods
Ten apparently healthy male individuals with at least a year of resistance exercise experience were recruited for this study. The mean (±SD) age, mass, and body fat percentage was 21 (±2.27) years, 90.4 (±19.3) kg, and 20 (±8.5) %, respectively. The first visit consisted of baseline preliminary test to determine 1-RM on angled leg press, a 30 min recovery, followed by four sets of reps to fatigue protocol at 70% of that 1-RM. The reps to fatigue protocol consisted of four sets to failure separated by 45 s of rest. Foot positioning and knee angle ROM were standardized for each participant for each visit. For visits 2 and 3, participants were divided in a randomized, double-blind, cross-over experimental design, participants completed the same reps to fatigue bout after ingesting either placebo or carbohydrate. At the start of each visit, participants ingested either a maltodextrin carbohydrate supplement at 2 g/kg body mass or non-caloric, identically-tasting placebo, and waited 30 min before completing the four sets of reps to fatigue. A 2x4 repeated measures ANOVA and a pair samples t-test were conducted at a significance level of p < .05.
Results
No significant difference in total reps to fatigue (t(9)=-1.47, p = .174) was found between placebo 53.8 (±7.8) vs. 51.8 (±6.9) carbohydrate conditions. No significant difference in reps completed was seen between conditions within each individual set (F(1, 9)= 2.169, p = .175, η2 = .194). However, there was a significant difference in reps completed between sets for both conditions (F(3, 9)= 126.1, p < .001, η2 = .933). Pairwise comparisons indicated that there was a significant decrease in reps completed between all sequential sets in both conditions, except sets 3 and 4 (p = .212).
Conclusions
Carbohydrate did not appear to have any effect on resistance exercise performance when completed to fatigue. Similarly, carbohydrate consumption did not alter recovery between sets which is indicated by the total reps to fatigue within each set being identical between conditions. This indicates that carbohydrate did not have any impact on performance or acute inter-set recovery during the exhaustive resistance exercise bout.
Proceedings of the Sixteenth International Society of Sports Nutrition (ISSN) Conference and Expo. A34 Effects of Carbohydrate Supplementation on Resistance Exercise Performance and Index of Fatigue.