School of Nutrition and Dietetics, Faculty of Pure & Applied Science, Acadia University, Wolfville, Nova Scotia, NS B4P 2R6, Canada.
College of Kinesiology, University of Saskatchewan, 87 Campus Dr, Saskatoon, SK S7N 5B2, Canada.
Nutrients. 2020 Apr 2;12(4):982. doi: 10.3390/nu12040982.
Consumption of low-glycemic index (GI) carbohydrates (CHO) may be superior to high-GI CHO before exercise by increasing fat oxidation and decreasing carbohydrate oxidation. We compared the effects of pre-exercise feeding of a low-GI lentil-based sports nutrition bar with a high-GI bar on metabolism and performance during a simulated soccer match. Using a randomized, double-blind, counterbalanced, crossover design, participants ( = 8) consumed 1.5 g/kg available CHO from a low-GI bar (GI = 45) or high-GI bar (GI = 101) two hours before a 90 min simulated soccer match, and 0.38 g/kg body mass during a 15 min half-time break. The test involved alternating 6 min intervals of paced jogging, running, walking, and sprinting, and 3 min intervals of soccer-specific skills (timed ball dribbling, agility running, heading, kicking accuracy). Carbohydrate oxidation rate was lower during the match after consuming the low-GI compared to high-GI bar (2.17 ± 0.6 vs. 2.72 ± 0.4 g/min; < 0.05). Participants performed better during the low-GI versus high-GI bar condition on the agility test (5.7 ± 0.4 versus 6.1 ± 0.6 s; < 0.01) and heading (i.e., jumping height 24.7 ± 4.3 versus 22.2 ± 4.5 cm; < 0.01) late in the soccer match (72 min). A low-GI lentil-based sports nutrition bar provides a metabolic benefit (lower carbohydrate oxidation rate) and a modest improvement in agility running and jumping height (heading) late in the test.
食用低血糖指数（GI）碳水化合物（CHO）可能优于高 GI CHO，因为前者可增加脂肪氧化并减少碳水化合物氧化。我们比较了运动营养棒（低 GI 基于小扁豆，GI=45）和高 GI 棒（GI=101）在模拟足球比赛前摄入对代谢和表现的影响。使用随机、双盲、交叉平衡设计，参与者（=8）在 90 分钟模拟足球比赛前两小时摄入 1.5 g/kg 可利用 CHO，在 15 分钟的中场休息期间摄入 0.38 g/kg 体重。测试涉及交替进行 6 分钟的节奏慢跑、跑步、步行和冲刺，以及 3 分钟的足球专项技能（计时控球、敏捷跑、顶球、射门精度）。与高 GI 棒相比，摄入低 GI 棒后，比赛期间的碳水化合物氧化率较低（2.17 ± 0.6 比 2.72 ± 0.4 g/min；<0.05）。与高 GI 棒相比，参与者在低 GI 棒条件下的敏捷测试（5.7 ± 0.4 比 6.1 ± 0.6 s；<0.01）和顶球（即，跳跃高度 24.7 ± 4.3 比 22.2 ± 4.5 cm；<0.01）表现更好，比赛后期（72 分钟）。低 GI 基于小扁豆的运动营养棒提供了代谢益处（降低碳水化合物氧化率），并适度提高了测试后期的敏捷跑步和跳跃高度（顶球）。
