No Effect of Delaying a Carbohydrate-Rich Breakfast on Afternoon High-Intensity Intermittent Exercise Performance in Trained Games Players: A Randomized, Single-Blind, Placebo-Controlled Trial.

IF 3 3区 医学 Q2 NUTRITION & DIETETICS
Christopher Lamb, Fletcher Collins-Shirley, Sion Rees-Millns, Alex Cowley, Thomas D Love, Mark Waldron, Yung-Chih Chen, Richard S Metcalfe
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引用次数: 0

Abstract

This study tested the hypothesis that delaying consumption of a carbohydrate-rich breakfast by 2 hr would impair prolonged high-intensity intermittent exercise performance in the afternoon. Fifteen intermittent games players (mean ± SD: age: 24 ± 6 years; V˙O2peak: 46 ± 6 ml·kg-1·min-1) completed a randomized, single-blind, placebo-controlled crossover study with two trials (EARLY and DELAY) matched for dietary intake. In EARLY, participants consumed a high-carbohydrate (semisolid) breakfast shake (2 g/kg BM maltodextrin, 1 ml/kg BM orange squash, 0.15 g/kg BM xanthan gum, 0.067 g/kg BM artificial sweetener, and 6 ml/kg BM water) at 8 a.m., followed by a taste and texture matched, but energy depleted, placebo shake 2 hr later. In DELAY, the order of these shakes was reversed. Three hours following a high-carbohydrate lunch (888 ± 107 Kcal, 145 ± 28 g carbohydrate), participants completed a 90-min intermittent cycling test, consisting of two 40-min halves, with 10 min of rest in between. Each half involved 18 repeated 2-min blocks of steady-state cycling (100 s; 35% Wmax), followed by 15 s of unloaded pedaling and a 6-s all-out sprint. There were no differences in peak power (first half: mean difference [95% confidence interval]: 6.6 [-10.9, 24.1] W, d = 0.03 and second half: 8.5 [-6.5, 23.6] W, d = 0.04) or mean power (first half: mean difference: 6.4 [-10.7, 23.5] W, d = 0.03 and second half: mean difference: 7.3 [-6.5, 21.3] W, d = 0.04) during the sprints between the DELAY and EARLY conditions. In contrast with our hypothesis, these data provide no evidence that delaying consumption of a carbohydrate-rich breakfast by 2 hr impairs prolonged high-intensity intermittent exercise performance in the afternoon.

延迟富含碳水化合物的早餐对训练有素的游戏玩家下午高强度间歇性运动表现没有影响:一项随机、单盲、安慰剂对照试验。
这项研究验证了一种假设,即推迟两小时食用富含碳水化合物的早餐会损害下午长时间高强度间歇性运动的表现。间歇游戏玩家15名(平均±SD:年龄:24±6岁;V˙o2峰值:46±6 ml·kg-1·min-1)完成了一项随机、单盲、安慰剂对照的交叉研究,其中有两个试验(EARLY和DELAY)匹配饮食摄入量。在EARLY中,参与者在早上8点饮用高碳水化合物(半固体)早餐奶昔(2克/千克BM麦芽糊精,1毫升/千克BM橙汁,0.15克/千克BM黄原胶,0.067克/千克BM人工甜味剂和6毫升/千克BM水),然后在2小时后饮用味道和质地匹配但能量耗尽的安慰剂奶昔。在DELAY中,这些震动的顺序被颠倒了。在高碳水化合物午餐(888±107 Kcal, 145±28 g碳水化合物)后3小时,参与者完成了90分钟的间歇自行车测试,包括两个40分钟的半场,中间休息10分钟。每一半包括18个重复的2分钟的稳态循环(100秒;35% Wmax),然后是15秒的无负荷蹬车和6秒的全速冲刺。在DELAY和EARLY条件之间的冲刺期间,峰值功率(前半部分:平均差值[95%置信区间]:6.6 [-10.9,24.1]W, d = 0.03,后半部分:8.5 [-6.5,23.6]W, d = 0.04)或平均功率(前半部分:平均差值:6.4 [-10.7,23.5]W, d = 0.03,后半部分:平均差值:7.3 [-6.5,21.3]W, d = 0.04)没有差异。与我们的假设相反,这些数据没有提供证据表明,延迟摄入富含碳水化合物的早餐2小时会损害下午长时间高强度间歇性运动的表现。
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来源期刊
CiteScore
5.00
自引率
8.00%
发文量
50
审稿时长
6-12 weeks
期刊介绍: The International Journal of Sport Nutrition and Exercise Metabolism (IJSNEM) publishes original scientific investigations and scholarly reviews offering new insights into sport nutrition and exercise metabolism, as well as articles focusing on the application of the principles of biochemistry, physiology, and nutrition to sport and exercise. The journal also offers editorials, digests of related articles from other fields, research notes, and reviews of books, videos, and other media releases. To subscribe to either the print or e-version of IJSNEM, press the Subscribe or Renew button at the top of your screen.
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