Department of Kinesiology and Health Education, The University of Texas at Austin Exercise Physiology and Metabolism Laboratory, Austin, Texas, USA.
J Strength Cond Res. 2010 Jan;24(1):48-59. doi: 10.1519/JSC.0b013e3181c32e20.
The purpose of the present study was to investigate the aerobic capacity characteristics of an isocaloric carbohydrate (CHO) plus protein (PRO) drink and a low-calorie CHO plus PRO drink against a traditional 6% CHO sports beverage. Twelve male and female trained cyclists exercised on 4 separate occasions at intensities that varied between 55 and 75% V(O2)max for 2.5 hours and then at 80% V(O2)max until fatigued. Supplements (255.4 +/- 9.1 mL) were provided every 20 minutes and consisted of a 4.5% carbohydrate plus 1.15% protein complex (CHO/PRO H), a 3% carbohydrate plus 0.75% protein complex (CHO/PRO L), a 6% carbohydrate supplement (CHO), or a placebo (PLA). Time to fatigue at 80% V(O2)max was significantly longer (p < 0.05) during the CHO (26.9 +/- 6.1 minutes, mean +/- SE), the CHO/PRO H (30.5 +/- 5.9 minutes), and the CHO/PRO L (28.9 +/- 6.5 minutes) trials compared with the PLA trial (14.7 +/- 3.4 minutes), with no significant differences among the CHO, CHO/PRO H, and CHO/PRO L treatments. In general, blood glucose, plasma insulin, and carbohydrate oxidation were elevated above PLA during the CHO, CHO/PRO H, and CHO/PRO L trials, whereas plasma free fatty acids, rating of perceived exertion, and fat oxidation values were lower during the CHO, CHO/PRO H, and CHO/PRO L trials compared with the PLA trial. Only minor differences in blood parameters occurred among the CHO, CHO/PRO H, and CHO/PRO L treatments. In summary, partially substituting PRO for CHO in a sports drink did not enhance aerobic capacity, but substitution was able to occur without loss of efficacy. Thus, adding PRO to a low-calorie CHO sports drink may be an effective strategy to enhance aerobic capacity while limiting carbohydrate and caloric consumption.
本研究旨在研究等热量碳水化合物（CHO）加蛋白质（PRO）饮料和低热量 CHO 加 PRO 饮料与传统 6%CHO 运动饮料相比的有氧能力特征。12 名男女训练有素的自行车运动员在 4 次不同的情况下进行运动，运动强度在 55%至 75%V（O2）max 之间变化，持续 2.5 小时，然后以 80%V（O2）max 运动至疲劳。每 20 分钟提供一次补充剂（255.4 +/- 9.1 毫升），由 4.5%碳水化合物加 1.15%蛋白质复合物（CHO/PRO H）、3%碳水化合物加 0.75%蛋白质复合物（CHO/PRO L）、6%碳水化合物补充剂（CHO）或安慰剂（PLA）组成。在 80%V（O2）max 时的疲劳时间在 CHO（26.9 +/- 6.1 分钟，平均值 +/- SE）、CHO/PRO H（30.5 +/- 5.9 分钟）和 CHO/PRO L（28.9 +/- 6.5 分钟）试验中明显长于 PLA 试验（14.7 +/- 3.4 分钟），CHO、CHO/PRO H 和 CHO/PRO L 治疗之间没有显着差异。一般来说，CHO、CHO/PRO H 和 CHO/PRO L 试验中血糖、血浆胰岛素和碳水化合物氧化均高于 PLA，而游离脂肪酸、感知用力程度和脂肪氧化值在 CHO、CHO/PRO H 和 CHO/PRO L 试验中低于 PLA 试验。CHO、CHO/PRO H 和 CHO/PRO L 治疗之间的血液参数仅略有差异。总之，在运动饮料中部分替代 PRO 不会增强有氧能力，但替代 PRO 而不降低功效是可能的。因此，在低热量 CHO 运动饮料中添加 PRO 可能是一种有效策略，可以在限制碳水化合物和卡路里消耗的同时增强有氧能力。
