Large (48-g), isonitrogenous doses of rice and whey protein have previously been shown to stimulate similar adaptations to resistance training, but the impact of consuming smaller doses has yet to be compared. We evaluated the ability of 24-g doses of rice or whey protein concentrate to augment adaptations following 8 weeks of resistance training. Healthy resistance-trained males (n?=?24, 32.8?±?6.7?years, 179.3?±?8.5?cm, 87.4?±?8.5?kg, 27.2?±?1.9?kg/m2, 27.8?±?6.0% fat) were randomly assigned and matched according to fat-free mass to consume 24-g doses of rice (n?=?12, Growing Naturals, LLC) or whey (n?=?12, NutraBio Labs, Inc.) protein concentrate for 8 weeks while completing a standardized resistance training program. Body composition (DXA), muscular strength (one-repetition maximum [1RM]) and endurance (repetitions to fatigue [RTF] at 80% 1RM) using bench press (BP) and leg press (LP) exercises along with anaerobic capacity (Wingate) were assessed before and after the intervention. Subjects were asked to maintain regular dietary habits and record dietary intake every 2 weeks. Outcomes were assessed using 2?×?2 mixed (group x time) factorial ANOVA with repeated measures on time and independent samples t-tests using the change scores from baseline. A p-value of 0.05 and 95% confidence intervals on the changes between groups were used to determine outcomes. No baseline differences (p??0.05) were found for key body composition and performance outcomes. No changes (p??0.05) in dietary status occurred within or between groups (34?±?4?kcal/kg/day, 3.7?±?0.77?g/kg/day, 1.31?±?0.28?g/kg/day, 1.87?±?0.23?g/kg/day) throughout the study for daily relative energy (34?±?4 kcals/kg/day), carbohydrate (3.7?±?0.77?g/kg/day), fat (1.31?±?0.28?g/kg/day), and protein (1.87?±?0.23?g/kg/day) intake. Significant main effects for time were revealed for body mass (p?=?0.02), total body water (p?=?0.01), lean mass (p?=?0.008), fat-free mass (p?=?0.007), BP 1RM (p?=?0.02), BP volume (p?=?0.04), and LP 1RM (p?=?0.01). Changes between groups were similar for body mass (??0.88, 2.03?kg, p?=?0.42), fat-free mass (??0.68, 1.99?kg, p?=?0.32), lean mass (??0.73, 1.91?kg, p?=?0.37), fat mass (??0.48, 1.02?kg, p?=?0.46), and % fat (??0.63, 0.71%, p?=?0.90). No significant between group differences were seen for BP 1RM (??13.8, 7.1?kg, p?=?0.51), LP 1RM (??38.8, 49.6?kg, p?=?0.80), BP RTF (??2.02, 0.35 reps, p?=?0.16), LP RTF (??1.7, 3.3 reps, p?=?0.50), and Wingate peak power (??72.5, 53.4 watts, p?=?0.76) following the eight-week supplementation period. Eight weeks of daily isonitrogenous 24-g doses of rice or whey protein in combination with an eight-week resistance training program led to similar changes in body composition and performance outcomes. Retroactively registered on as NCT04411173 .
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机译：大（48克），先前已经显示出刺激性剂量的水稻和乳清蛋白，刺激了对抗性训练的类似调整，但尚未比较消耗较小剂量的影响。我们评估了24克耐药米或乳清蛋白浓缩物的能力，以增加抗性训练8周后的增强适应性。健康的抗性培训的男性（n？=？24,32.8？±6.7？年，179.3？±α？8.5？cm，87.4？±8.5？kg，27.2？±1.9？kg / m 2，27.8？kg / m2,27.8？ 6.0％脂肪是根据无脂肪块随机分配和匹配的，以消耗24g米（n？= 12，种植的Naturals，LLC）或乳清（n？= 12，Nutrabio Labs，Inc。）蛋白质浓缩8周，同时完成标准化的电阻训练计划。身体成分（DXA），肌肉强度（一次重复最大[1RM]）和80％1RM的耐久性（重复于疲劳），使用台式压力机（BP）和腿部压力机（LP）锻炼以及厌氧容量（WinGate ）在干预之前和之后评估。要求受试者维持常规饮食习惯并每2周记录膳食摄入量。使用2？×2混合（组X时间）因子Anova评估结果，随着时间和独立样本的时间和独立样品T检验，使用来自基线的变化分数的重复措施。对基团之间的变化的p值为0.05和95％的置信区间来确定结果。没有发现基线差异（P？>？0.05）用于关键身体成分和性能结果。在组内或在组之间发生饮食状态的任何变化（p？> 0.05）（34？±4？kcal / kg /天，3.7？±0.77？g / kg /天，1.31？±0.28？g /千克/天，1.87？±0.23？g / kg /天）整个研究，每次相对能量（34？±4 kcals /天/天），碳水化合物（3.7？±0.77？g / kg /天） ，脂肪（1.31？±0.28？g / kg /天）和蛋白质（1.87？±0.23？g / kg /天）摄入。对于体重（p？= 0.02），总体水（p≤x0.01），稀质量（p≤= 0.008），无脂肪质量（p？= 0.008） ，BP 1RM（p？= 0.02），BP体积（p？= 0.04），和LP 1rm（p？= 0.01）。组之间的变化与体重相似（?? 0.88,2.03？kg，p？= 0.42），无脂肪质量（?? 0.68,1.99？kg，p？= 0.32），瘦物质（?? 0.73 ，1.91？kg，p？= 0.37），脂肪质量（?? 0.48,1.02？kg，p？= 0.46），％脂肪（Δθ0.63,0.71％，p？0.90）。对于BP 1RM（约13.8,7.1 kg，p？= 0.51），Lp 1rm（ - 38.8,49.6？kg，p？= 0.80），BP RTF（α2.2.02） ，0.35次代表，p？=？0.16），LP RTF（?? 1.7,3.3代表，P？=？0.50），以及八个 - 八 - 八峰峰值功率（?? 72.5,53.4瓦，P？= 0.76）。周补充期。每日八周的日常等纯度24克米或乳清蛋白结合八周的抗性训练计划导致了身体成分和性能结果的相似变化。作为NCT04411173追溯登记。
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