Effects of supplement timing and resistance exercise on skeletal muscle hypertrophy
Effects of supplement timing and resistance exercise on skeletal muscle hypertrophy
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DOI：
10.1249/01.mss.0000233790.08788.3e
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发表时间：
2006-11-01
期刊：
影响因子：
--
通讯作者：
Hayes, Alan
中科院分区：
文献类型：
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作者：
Cribb, Paul J.;Hayes, Alan
目的：一些研究报告，在阻力运动（RE）训练期间，从补充时间（即，在每次锻炼之前和/或之后蛋白质和碳水化合物的策略性消耗）。然而，没有研究检查这种策略是否提供了更大的肌肉肥大或力量发展相比，在其他时间在一天中的补充。本研究的目的是检查在10周的RE计划期间，补充时间与补充时间不接近锻炼对肌肉纤维肥大，力量和身体成分的影响。研究方法：在一项单盲、随机的研究中，经过阻力训练的男性被分为两组; PRE-POST组服用补充剂（1 g（.）kg（-1）体重），含蛋白质/肌酸/葡萄糖。MOR-EVE组在早上和晚上服用相同剂量的相同补充剂。所有评估均在10周结构化、有监督的RE培训前后一周完成。评估包括力量（1 RM，三次运动），身体成分（DEXA）和股外侧肌活检，以确定肌纤维类型（I，IIa，IIx），横截面积（CSA），收缩蛋白，肌酸（Cr）和糖原含量。结果：PRE-POST在三项评估中的两项评估中显示出更大（P < 0.05）的瘦体重和1 RM强度增加。Ⅱ型肌纤维的CSA和收缩蛋白含量显著增加（P < 0.05），支持了体成分的变化。训练后补充PRE-POST组的肌铬和肌糖原值也明显高于对照组（P < 0.05）。结论：补充时间是一种简单但有效的策略，可以增强再训练所需的适应性。
Purpose: Some studies report greater muscle hypertrophy during resistance exercise (RE) training from supplement timing (i.e., the strategic consumption of protein and carbohydrate before and/or after each workout). However, no studies have examined whether this strategy provides greater muscle hypertrophy or strength development compared with supplementation at other times during the day. The purpose of this study was to examine the effects of supplement timing compared with supplementation in the hours not close to the workout on muscle-fiber hypertrophy, strength, and body composition during a 10-wk RE program. Methods: In a single-blind, randomized protocol, resistance-trained males were matched for strength and placed into one of two groups; the PRE-POST group consumed a supplement (1 g(.)kg(-1) body weight) containing protein/creatine/glucose immediately before and after RE. The MOR-EVE group consumed the same dose of the same supplement in the morning and late evening. All assessments were completed the week before and after 10 wk of structured, supervised RE training. Assessments included strength (1RM, three exercises), body composition (DEXA), and vastus lateralis muscle biopsies for determination of muscle fiber type (I, IIa, IIx), cross-sectional area (CSA), contractile protein, creatine (Cr), and glycogen content. Results: PRE-POST demonstrated a greater (P < 0.05) increase in lean body mass and 1RM strength in two of three assessments. The changes in body composition were supported by a greater (P < 0.05) increase in CSA of the type II fibers and contractile protein content. PRE-POST supplementation also resulted in higher muscle Cr and glycogen values after the training program (P < 0.05). Conclusion: Supplement timing represents a simple but effective strategy that enhances the adaptations desired from RE-training.