Department of Health Sciences, Stetson University, Deland, Florida, USA.
Physiology of Work and Exercise Response (POWER) Laboratory, Institute of Exercise Physiology and Rehabilitation Science, University of Central Florida, Orlando, Florida, USA.
J Int Soc Sports Nutr. 2023 Dec;20(1):2178858. doi: 10.1080/15502783.2023.2178858.
Carbohydrate (CHO) and carbohydrate-protein co-ingestion (CHO-P) have been shown to be equally effective for enhancing glycogen resynthesis and subsequent same-day performance when CHO intake is suboptimal (≤0.8 g/kg). Few studies have specifically examined the effect of isocaloric CHO vs CHO-P consumption on subsequent high-intensity aerobic performance with limited time to recover (≤2 hours) in masters class endurance athletes.
This was a randomized, double-blind between-subject design. Twenty-two male masters class endurance athletes (age 49.1 ± 6.9 years; height 175.8 ± 4.8 cm; body mass 80.7 ± 8.6 kg; body fat (%) 19.1 ± 5.8; VO 48.6 ± 6.7 ml·kg·min) were assigned to consume one of three beverages during a 2-hour recovery period: Placebo (PLA; electrolytes and water), CHO (1.2 g/kg bm), or CHO-P (0.8 g/kg bm CHO + 0.4 g/kg bm PRO). All beverages were standardized to one liter (~32 oz.) of total fluid volume regardless of the treatment group. During Visit #1, participants completed graded exercise testing on a cycle ergometer to determine VOpeak and peak power output (PPO, watts). Visit #2 consisted of familiarization with the high-intensity protocol including 5 × 4 min intervals at 70-80% of PPO with 2 min of active recovery at 50 W, followed by a time to exhaustion (TTE) test at 90% PPO. During Visit#3, the same high-intensity interval protocol with TTE was conducted pre-and post-beverage consumption.
A one-way ANCOVA indicated a significant difference among the group means for the posttest TTE (F = 6.702, = .007, ƞ = .427) values after adjusting for the pretest differences. TTE performance in the second exercise bout improved for the CHO (295.48 ± 24.90) and CHO-P (255.08 ± 25.07 sec) groups. The water and electrolyte solution was not effective in restoring TTE performance in the PLA group (171.13 ± 23.71 sec).
Both CHO and CHO-P effectively promoted an increase in TTE performance with limited time to recover in this sample of masters class endurance athletes. Water and electrolytes alone were not effective for restoring endurance capacity during the second bout of exhaustive exercise.
当碳水化合物（CHO）的摄入量不足（≤0.8g/kg）时，CHO 和 CHO-蛋白质共摄入已被证明同样有效地增强糖原合成和随后的当天表现。很少有研究专门检查等热量 CHO 与 CHO-P 消耗对随后的高强度有氧表现的影响，在 Masters 级耐力运动员中，恢复时间有限（≤2 小时）。
这是一项随机、双盲、组间设计。22 名男性 Masters 级耐力运动员（年龄 49.1±6.9 岁；身高 175.8±4.8cm；体重 80.7±8.6kg；体脂（%）19.1±5.8；VO 48.6±6.7ml·kg·min）在 2 小时恢复期内被分配饮用三种饮料之一：安慰剂（PLA；电解质和水）、CHO（1.2g/kg bm）或 CHO-P（0.8g/kg bm CHO+0.4g/kg bm PRO）。所有饮料都标准化为一升（约 32 盎司）总液体量，无论治疗组如何。在第一次访问时，参与者在自行车测力计上进行了分级运动测试，以确定 VOpeak 和峰值功率输出（PPO，瓦特）。第二次访问包括高强度方案的熟悉，包括 5×4 分钟间隔，以 70-80%的 PPO，2 分钟主动恢复 50W，然后进行 90%PPO 的时间耗尽（TTE）测试。在第三次访问中，在饮料消耗前后进行了相同的高强度间隔方案和 TTE。
单向方差分析表明，在调整预测试差异后，组间均值的后测 TTE（F=6.702，p=0.007，ƞ=0.427）值存在显著差异。CHO（295.48±24.90）和 CHO-P（255.08±25.07 秒）组的第二次运动回合 TTE 表现有所提高。水和电解质溶液在 PLA 组中没有有效地恢复 TTE 表现（171.13±23.71 秒）。
在这个 Masters 级耐力运动员样本中，CHO 和 CHO-P 都有效地促进了 TTE 表现的提高，并且在恢复时间有限的情况下。单独的水和电解质溶液在第二次耗尽运动回合中没有有效地恢复耐力能力。
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