Sasaki H, Maeda J, Usui S, Ishiko T
Human Performance Laboratory, Hokuriku Institute of Wellness and Sports Science, Ishikawa, Japan.
Int J Sports Med. 1987 Aug;8(4):261-5. doi: 10.1055/s-2008-1025666.
To investigate the effect of sucrose or caffeine ingestion on the performance of prolonged running, five male distance runners attending senior high school (15.6 yrs) carried out running on a treadmill at an intensity corresponding to the individuals' 80% VO2 max until exhaustion. Before and 45 min after exercise, the subjects were given either a placebo (Con), sucrose (81 +/- 18 g) (Su), caffeine (384 +/- 13 mg) (Caf), or sucrose (72 +/- 22 g) plus caffeine (396 +/- 29 mg) (Su + Caf) solution. The duration of the exercise was significantly longer in Su, Caf, and Su + Caf than in Con. The duration in four of five subjects was longest in Su + Caf, although it was not significantly different from that in Su or Caf. Carbohydrate (CHO) utilization was highest in Su while fat utilization was highest in Caf. The energy supply from both sources was almost the same between Con and Su + Caf. The plasma glucose concentration was higher in Su than in Con. The plasma free fatty acid (FFA) level was higher in Caf than in Con. The plasma glucose and lactic acid concentrations were highest in Su + Caf while the plasma FFA level was the same as in Con. In conclusion, ingestion of sucrose, caffeine, or sucrose plus caffeine solution was equally effective in improving endurance during running carried out at an intensity of approximately 80% VO2 max.
为研究摄入蔗糖或咖啡因对长时间跑步表现的影响，五名高中男性长跑运动员（15.6岁）在跑步机上以相当于其最大摄氧量80%的强度跑步直至力竭。在运动前和运动后45分钟，受试者分别饮用安慰剂（Con）、蔗糖（81±18克）（Su）、咖啡因（384±13毫克）（Caf）或蔗糖（72±22克）加咖啡因（396±29毫克）（Su + Caf）溶液。Su、Caf和Su + Caf组的运动持续时间显著长于Con组。五名受试者中有四名在Su + Caf组的运动持续时间最长，尽管与Su组或Caf组无显著差异。碳水化合物（CHO）利用率在Su组最高，而脂肪利用率在Caf组最高。Con组和Su + Caf组两种能量来源的供能几乎相同。Su组的血浆葡萄糖浓度高于Con组。Caf组的血浆游离脂肪酸（FFA）水平高于Con组。Su + Caf组的血浆葡萄糖和乳酸浓度最高，而血浆FFA水平与Con组相同。总之，摄入蔗糖、咖啡因或蔗糖加咖啡因溶液在提高以约80%最大摄氧量强度跑步时的耐力方面同样有效。
