Saunders Michael J, Luden Nicholas D, Herrick Jeffrey E
Human Performance Laboratory, Department of Kinesiology, James Madison University, Harrisonburg, Virginia 22807, USA.
J Strength Cond Res. 2007 Aug;21(3):678-84. doi: 10.1519/R-20506.1.
Investigators have reported improved endurance performance and attenuated post-exercise muscle damage with carbohydrate-protein beverages (CHO+P) versus carbohydrate-only beverages (CHO). However, these benefits have been demonstrated only when CHO+P was administered in beverage-form, and exclusively in male subjects. Thus, the purposes of this study were to determine if an oral CHO+P gel improved endurance performance and post-exercise muscle damage compared to a CHO gel, and determine if responses were similar between genders. Thirteen cyclists (8 men, 5 women; VO(2)peak = 57.9 +/- 7.0 ml x kg(-1) x min(-1)) completed two timed cycle-trials to volitional exhaustion at 75% of VO(2)peak. At 15-minute intervals throughout these rides, subjects received CHO or CHO+P gels, which were matched for carbohydrate content (CHO = 0.15 g CHO x kg BW(-1); CHO+P = 0.15 g CHO + 0.038 g protein x kg BW(-1)). Trials were performed using a randomly counterbalanced, double-blind design. Subjects rode 13% longer (p < 0.05) when utilizing the CHO+P gel (116.6 +/- 28.5 minutes) versus the CHO gel (102.8 +/- 25.0 minutes). In addition, men (101.8 +/- 24.6; 114.8 +/- 26.2) and women (104.4 +/- 28.6; 119.6 +/- 34.9) responded similarly to the CHO and CHO+P trials, with no significant treatment-by-gender effect. Postexercise creatine kinease (CK) was not significantly different between treatments. However, CK increased significantly following exercise in the CHO trial (183 +/- 116; 267 +/- 214 U x L(-1)), but not the CHO+P trial (180 +/- 133; 222 +/- 141 U x L(-1)). Therefore, to prolong endurance performance and prevent increases in muscle damage, it is recommended that male and female cyclists consume CHO+P gels rather than CHO gels during and immediately following exercise.
研究人员报告称，与仅含碳水化合物的饮料（CHO）相比，碳水化合物 - 蛋白质饮料（CHO + P）能改善耐力表现并减轻运动后肌肉损伤。然而，这些益处仅在以饮料形式给予CHO + P时得到证实，且仅在男性受试者中出现。因此，本研究的目的是确定口服CHO + P凝胶与CHO凝胶相比是否能改善耐力表现和运动后肌肉损伤，并确定不同性别之间的反应是否相似。13名自行车运动员（8名男性，5名女性；VO₂峰值 = 57.9 ± 7.0 ml·kg⁻¹·min⁻¹）以VO₂峰值的75%完成了两次计时自行车试验，直至自愿力竭。在整个骑行过程中，每隔15分钟，受试者接受CHO或CHO + P凝胶，两种凝胶的碳水化合物含量相同（CHO = 0.15 g CHO·kg体重⁻¹；CHO + P = 0.15 g CHO + 0.038 g蛋白质·kg体重⁻¹）。试验采用随机平衡、双盲设计。与使用CHO凝胶（102.8 ± 25.0分钟）相比，使用CHO + P凝胶时受试者骑行时间延长了13%（p < 0.05）（116.6 ± 28.5分钟）。此外，男性（101.8 ± 24.6；114.8 ± 26.2）和女性（104.4 ± 28.6；119.6 ± 34.9）对CHO和CHO + P试验的反应相似，不存在显著的性别 - 处理效应。运动后肌酸激酶（CK）在不同处理之间无显著差异。然而，在CHO试验中运动后CK显著升高（183 ± 116；267 ± 214 U·L⁻¹），而在CHO + P试验中未升高（180 ± 133；222 ± 141 U·L⁻¹）。因此，为了延长耐力表现并防止肌肉损伤增加，建议男性和女性自行车运动员在运动期间及运动后立即食用CHO + P凝胶而非CHO凝胶。
