Supplementing postexercise carbohydrate (CHO) intake with protein has been suggested to enhance recovery from endurance exercise. The aim of this study was to investigate whether adding protein to the recovery drink can improve 24-hr recovery when CHO intake is suboptimal. In a double-blind crossover design, 12 trained men performed three 2-day trials consisting of constant-load exercise to reduce glycogen on Day 1, followed by ingestion of a CHO drink (1.2 g·kg⁻¹·2 hr⁻¹) either without or with added whey protein concentrate (CHO + PRO) or whey protein hydrolysate (CHO + PROH) (0.3 g·kg⁻¹·2 hr⁻¹). Arterialized blood glucose and insulin responses were analyzed for 2 hr postingestion. Time-trial performance was measured the next day after another bout of glycogen-reducing exercise. The 30-min time-trial performance did not differ between the three trials (M ± SD, 401 ± 75, 411 ± 80, 404 ± 58 kJ in CHO, CHO + PRO, and CHO + PROH, respectively, p = .83). No significant differences were found in glucose disposal (area under the curve [AUC]) between the postexercise conditions (364 ± 107, 341 ± 76, and 330 ± 147, mmol·L⁻¹·2 hr⁻¹, respectively). Insulin AUC was lower in CHO (18.1 ± 7.7 nmol·L⁻¹·2 hr⁻¹) compared with CHO + PRO and CHO + PROH (24.6 ± 12.4 vs. 24.5 ± 10.6, p = .036 and .015). No difference in insulin AUC was found between CHO + PRO and CHO + PROH. Despite a higher acute insulin response, adding protein to a CHO-based recovery drink after a prolonged, high-intensity exercise bout did not change next-day exercise capacity when overall 24-hr macronutrient and caloric intake was controlled.

有人建议用蛋白质补充运动后碳水化合物 (CHO) 的摄入量，以增强耐力运动的恢复。本研究的目的是调查当 CHO 摄入量不理想时，在恢复饮料中添加蛋白质是否可以改善 24 小时恢复。在双盲交叉设计中，12 名训练有素的男性进行了 3 次为期 2 天的试验，包括在第 1 天进行恒定负荷运动以减少糖原，然后摄入 CHO 饮料 (1.2 g·kg ^-1 ·2 hr ^-1 )不加或加有浓缩乳清蛋白 (CHO + PRO) 或水解乳清蛋白 (CHO + PROH) (0.3 g·kg ^-1 ·2 hr ^-1）。分析动脉化血糖和胰岛素反应2 小时postestion。在另一轮减少糖原的运动后的第二天测量了计时赛的表现。30 分钟的计时性能在三个试验之间没有差异（M  ±  SD，401 ± 75、411 ± 80、404 ± 58 kJ，分别在 CHO、CHO + PRO 和 CHO + PROH 中，p  = .83 ）。运动后条件（分别为 364 ± 107、341 ± 76 和 330 ± 147，mmol·L ^-1 ·2 hr ^-1 ）之间的葡萄糖处理（曲线下面积 [AUC]）没有显着差异。CHO 中的胰岛素 AUC 较低 (18.1 ± 7.7 nmol·L ^-1 ·2 hr ^-1) 与 CHO + PRO 和 CHO + PROH (24.6 ± 12.4 vs. 24.5 ± 10.6, p  = .036 和 .015) 相比。在 CHO + PRO 和 CHO + PROH 之间没有发现胰岛素 AUC 的差异。尽管有较高的急性胰岛素反应，但在控制 24 小时常量营养素和热量摄入的总体情况下，在长时间的高强度运动回合后向基于 CHO 的恢复饮料中添加蛋白质并没有改变第二天的运动能力。