Nielsen Lotte L K, Lambert Max Norman Tandrup, Jensen Jørgen, Jeppesen Per Bendix
Department of Clinical Medicine, Aarhus University Hospital, Aarhus University, Palle Juul-Jensens Boulevard 165, 8200 Aarhus, Denmark.
Department of Physical Performance, Norwegian School of Sports Sciences, 0863 Oslo, Norway.
Nutrients. 2024 Dec 23;16(24):4412. doi: 10.3390/nu16244412.
This study aimed to compare the effects of a carbohydrate (CHO) hydrogel with (ALG-CP) or without (ALG-C) branched-chain amino acids, and a CHO-only non-hydrogel (CON), on cycling performance. The hydrogels, encapsulated in an alginate matrix, are designed to control CHO release, potentially optimising absorption, increasing substrate utilisation, and reducing gastrointestinal distress as well as carious lesions.
In a randomised, double-blinded, crossover trial, 10 trained male cyclists/triathletes completed three experimental days separated by ~6 days. During the experimental days, participants completed a standardised 2 h cycling bout (EX1), followed by a time-to-exhaustion (TTE) performance test at W. Supplements were ingested during EX1.
Participants cycled ~8.8 (29.6%) and ~5.4 (29.1%) minutes longer during TTE with ALG-CP compared to ALG-C and CON, respectively. TTE was 65.28 ± 2.8 min with ALG-CP, 56.46 ± 10.92 min with ALG-C, and 59.89 ± 11.89 min with CON. Heart rate (HR) was lower during EX1 with ALG-CP ( = 0.03), and insulin levels increased more significantly during the first 45 min with ALG-CP. Plasma glucose and glucagon levels remained consistent across supplements, although glucagon was higher with ALG-CP before TTE. Post-exercise myoglobin levels were lower with ALG-CP compared to ALG-C ( = 0.02), indicating reduced muscle damage.
While ALG-CP improved performance duration compared to ALG-C and CON, the difference did not reach statistical significance. Additionally, there was a lower HR during the cycling session, alongside a significantly lower level of myoglobin with ALG-CP. These findings suggest that ALG-CP may offer advantages in cycling performance and recovery.
本研究旨在比较含（ALG-CP）或不含（ALG-C）支链氨基酸的碳水化合物（CHO）水凝胶，与仅含CHO的非水凝胶（CON）对骑行表现的影响。包裹在藻酸盐基质中的水凝胶旨在控制CHO释放，可能优化吸收、提高底物利用率、减少胃肠道不适以及龋齿损伤。
在一项随机、双盲、交叉试验中，10名训练有素的男性自行车运动员/铁人三项运动员完成了三个实验日，间隔约6天。在实验日期间，参与者完成一次标准化的2小时骑行（EX1），随后在W进行力竭时间（TTE）性能测试。在EX1期间摄入补充剂。
与ALG-C和CON相比，参与者在TTE期间使用ALG-CP时分别多骑行约8.8分钟（29.6%）和约5.4分钟（29.1%）。使用ALG-CP时TTE为65.28±2.8分钟，使用ALG-C时为56.46±10.92分钟，使用CON时为59.89±11.89分钟。使用ALG-CP时EX1期间心率（HR）较低（P = 0.03），并且在最初45分钟内使用ALG-CP时胰岛素水平升高更显著。尽管在TTE前使用ALG-CP时胰高血糖素较高，但补充剂之间血浆葡萄糖和胰高血糖素水平保持一致。与ALG-C相比，使用ALG-CP后运动后肌红蛋白水平较低（P = 0.02），表明肌肉损伤减少。
虽然与ALG-C和CON相比，ALG-CP改善了运动持续时间，但差异未达到统计学意义。此外，骑行期间HR较低，同时使用ALG-CP时肌红蛋白水平显著较低。这些发现表明ALG-CP可能在骑行表现和恢复方面具有优势。
