Obradović Jelena, Vukadinović Jurišić Mila, Rakonjac Dušan
Faculty of Sport and Physical Education, University of Novi Sad, Novi Sad, Serbia.
Faculty of Sport and Physical Education, University of Novi Sad, Novi Sad, Serbia -
J Sports Med Phys Fitness. 2020 Jun;60(6):864-869. doi: 10.23736/S0022-4707.20.09742-X. Epub 2020 Feb 27.
In past few decades, supplementation has become very popular within professional and recreational athletes. Most interested among supplements are protein and amino acids. Therefore, the purpose of this study was to examine the effects of leucine supplementation in comparison to whey protein supplementation with placebo group on strength and body composition during 8 weeks of resistance training program.
Thirty male college athletes (mean age±SD =23.92±1.54 years) participated in this investigation and were randomly assigned to one of three groups: whey protein (WP, N.=10), leucine (LEU, N.=10) or placebo (PLA, N.=10). The WP, LEU and PLA performed resistance training for 8 weeks. Strength (1RM bench press, squat, shoulder press) and maximum pull-ups and body composition has been assessed and data was analyzed with mixed-design analysis of variance (P≤0.01).
The WP group achieved significantly greater (P≤0.01) increases in 1RM bench press than the LEU and PLA groups (+16 kg for WP; + 7.5 kg for LEU and + 5 kg for PLA). The LEU group achieved significantly greater gains (P≤0.01) in fat free mass, muscle mass and significantly decreases (P≤0.01) in fat mass compared to WP and PLA groups.
Whey protein supplementation in male collegiate athletes during resistance training achieved greater increase in strength than leucine and placebo groups, and leucine group achieved significantly greater improvement in body composition than whey protein and placebo groups.
在过去几十年中，补充剂在职业和业余运动员中变得非常流行。补充剂中最受关注的是蛋白质和氨基酸。因此，本研究的目的是在为期8周的抗阻训练计划中，比较亮氨酸补充剂与乳清蛋白补充剂加安慰剂组对力量和身体成分的影响。
30名男性大学生运动员（平均年龄±标准差=23.92±1.54岁）参与了本研究，并被随机分为三组之一：乳清蛋白组（WP，n=10）、亮氨酸组（LEU，n=10）或安慰剂组（PLA，n=10）。WP组、LEU组和PLA组进行了8周的抗阻训练。评估了力量（卧推、深蹲、肩推1RM）、最大引体向上次数和身体成分，并采用混合设计方差分析对数据进行分析（P≤0.01）。
与LEU组和PLA组相比，WP组的卧推1RM显著增加（P≤0.01）（WP组增加16kg；LEU组增加7.5kg，PLA组增加5kg）。与WP组和PLA组相比，LEU组的去脂体重、肌肉量显著增加（P≤0.01），脂肪量显著减少（P≤0.01）。
在抗阻训练期间，男性大学生运动员补充乳清蛋白比亮氨酸组和安慰剂组力量增加更大，亮氨酸组比乳清蛋白组和安慰剂组身体成分改善更显著。
