Beaudouin Florian, Joerg Frederic, Hilpert Anette, Meyer Tim, Hecksteden Anne
a Institute of Sports and Preventive Medicine , Saarland University, Faculty of Clinical Medicine , Saarbrücken , Germany.
J Sports Sci. 2018 Apr;36(8):942-948. doi: 10.1080/02640414.2017.1346276. Epub 2017 Jun 28.
Carbohydrate (CHO) availability during endurance exercise seems to attenuate exercise-induced perturbations of cellular homeostasis and might consequently diminish the stimulus for training adaptation. Therefore, a negative effect of CHO intake on endurance training efficacy seems plausible. This study aimed to test the influence of carbohydrate intake on the efficacy of an endurance training program on previously untrained healthy adults. A randomized cross-over trial (8-week wash-out period) was conducted in 23 men and women with two 8-week training periods (with vs. without intake of 50g glucose before each training bout). Training intervention consisted of 4x45 min running/walking sessions/week at 70% of heart rate reserve. Exhaustive, ramp-shaped exercise tests with gas exchange measurements were conducted before and after each training period. Outcome measures were maximum oxygen uptake (VO) and ventilatory anaerobic threshold (VT). VO and VT increased after training regardless of CHO intake (VO: Non-CHO 2.6 ± 3.0 mlminkg p = 0.004; CHO 1.4 ± 2.5 mlminkg p = 0.049; VT: Non-CHO 4.2 ± 4.2 mlminkg p < 0.001; CHO 3.0 ± 4.2 mlminkg p = 0.003). The 95% confidence interval (CI) for the difference between conditions was between +0.1 and +2.1 mlminkg for VO and between -1.2 and +3.1 for VT. It is concluded that carbohydrate intake could potentially impair the efficacy of an endurance training program.
耐力运动期间的碳水化合物（CHO）可利用性似乎会减弱运动引起的细胞内稳态紊乱，因此可能会减少训练适应的刺激。所以，CHO摄入对耐力训练效果产生负面影响似乎是合理的。本研究旨在测试碳水化合物摄入对未经训练的健康成年人耐力训练计划效果的影响。对23名男性和女性进行了一项随机交叉试验（8周洗脱期），包括两个8周的训练阶段（每个训练回合前摄入50克葡萄糖与不摄入）。训练干预包括每周4次、每次45分钟的跑步/步行训练，强度为心率储备的70%。在每个训练阶段前后进行了带有气体交换测量的力竭性斜坡运动测试。结果指标为最大摄氧量（VO）和通气无氧阈（VT）。无论是否摄入CHO，训练后VO和VT均增加（VO：无CHO组2.6±3.0毫升·分钟·千克，p = 0.004；CHO组1.4±2.5毫升·分钟·千克，p = 0.049；VT：无CHO组4.2±4.2毫升·分钟·千克，p < 0.001；CHO组3.0±4.2毫升·分钟·千克，p = 0.003）。两种情况之间差异的95%置信区间（CI），VO为+0.1至+2.1毫升·分钟·千克，VT为 -1.2至+3.1。结论是碳水化合物摄入可能会损害耐力训练计划的效果。
