CLINICAL TRIAL: NUTRITIONAL INTERVENTIONS FOR MAXIMAL MUSCLE GAIN IN MIDDLE-AGED

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 我们过去的研究重点是运动和氨基酸对久坐不动的受试者的短期影响。我们想扩大我们的研究，包括娱乐活跃的中年人，看看必需氨基酸对肌肉生长的影响。 我们假设，长期补充必需氨基酸的营养会使健康、受过训练的中年人的肌肉生长和力量增加。 我们将确定长期补充必需氨基酸的营养品是否可以在健康，训练有素的中年人中生长肌肉并增加力量。 入组的受试者将被随机分配每天接受补充剂或安慰剂（如糖丸），持续一年。他们将每四个月进行一次测试，以检查肌肉生长，力量测试和补充剂的安全性。在今年年底，所有的测试将再次进行，以获得最终结果。 这项试点研究将有助于确定营养干预对受过训练的中年人肌肉生长的可行性和安全性，并将使我们能够为更大规模的临床试验收集初步数据，以确定营养补充剂的最佳剂量和组成，以预防肌肉无力和衰老。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Our studies in the past have focused on the short term effects of exercise and amino acids in sedentary subjects. We would like to expand our research to include recreationally active middle aged people looking at the effect of essential amino acid on muscle growth. We hypothesize that long-term nutritional supplementation with essential amino acids will grow muscle and increase strength in healthy, trained middle-aged people. We will determine if long-term nutritional supplementation with essential amino acids can grow muscle and increase strength in healthy, trained middle aged people. Enrolled subjects will be randomized to receive supplement or a placebo (i.e. like a sugar pill ) every day for one year. They will be tested every four months to check for muscle growth, strength testing, and safety of the supplements. At the end of the year all tests will be performed again to get the final results. This pilot study will serve to determine feasibility and safety of a nutritional intervention for muscle growth in trained middle-aged persons, and will allow us to collect preliminary data for a larger clinical trial to determine the optimal dose and composition of nutritional supplements for the prevention of muscle weakness and loss with aging.