在10公里跑步机计时赛中，饮食中碳水化合物摄入量的改变对跑步表现的影响。
Effects of alterations in dietary carbohydrate intake on running performance during a 10 km treadmill time trial.
作者信息
Pitsiladis Y P, Duignan C, Maughan R J
机构信息
Department of Environmental and Occupational Medicine, University Medical School, Aberdeen, United Kingdom.
出版信息
Br J Sports Med. 1996 Sep;30(3):226-31. doi: 10.1136/bjsm.30.3.226.
OBJECTIVE
To examine the influence of a seven day diet manipulation on performance during a 10 km treadmill time trial in trained runners.
METHODS
Six trained runners ran two 10 km time trials on a treadmill set at a constant 4% gradient, each after a 7 d period of dietary manipulation. The two experimental diets were a low carbohydrate (CHO) diet (40% CHO by total energy) to be consumed for 7 d, and a high CHO diet containing 55% CHO for the first 4 d followed by 70% CHO for the remaining 3 d. Blood samples were obtained before and immediately after each run. Expired gases were collected and heart rate monitored.
RESULTS
Performance time following the high CHO [48.6(SD 2.7) min] and low CHO [48.6(2.3) min] diets was not different (P = 0.72), nor were there any differences in running speed between conditions. No significant differences were found between conditions in any of the metabolites measured (blood lactate, glucose, glycerol, and plasma free fatty acids). The rate of CHO oxidation was greater on the high CHO diet compared to the low CHO diet (P < 0.05). Heart rate was not different between conditions.
CONCLUSIONS
The results of this study indicate that moderate changes in the composition of the diet do not affect 10 km running performance in trained subjects.
目的
研究7天饮食调控对训练有素的跑步者进行10公里跑步机计时赛成绩的影响。
方法
6名训练有素的跑步者在坡度恒定为4%的跑步机上进行两次10公里计时赛，每次计时赛之前均有7天的饮食调控期。两种实验饮食分别为：一种低碳水化合物（CHO）饮食（碳水化合物供能占总能量的40%），持续食用7天；另一种高碳水化合物饮食，前4天碳水化合物含量为55%，后3天为70%。每次跑步前后均采集血样，收集呼出气体并监测心率。
结果
高碳水化合物饮食[48.6（标准差2.7）分钟]和低碳水化合物饮食[48.6（2.3）分钟]后的成绩无差异（P = 0.72），两种饮食条件下的跑步速度也无差异。所测的任何代谢物（血乳酸、葡萄糖、甘油和血浆游离脂肪酸）在两种饮食条件之间均无显著差异。与低碳水化合物饮食相比，高碳水化合物饮食的碳水化合物氧化率更高（P < 0.05）。两种饮食条件下的心率无差异。
结论
本研究结果表明，饮食组成的适度变化不会影响训练有素的受试者的10公里跑步成绩。
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