Effect of calcium β-hydroxy-β-methylbutyrate (CaHMB) with and without resistance training in men and women 65+yrs: A randomized, double-blind pilot trial

被引:91
作者
Stout, Jeffrey R. [1 ]
Smith-Ryan, Abbie E. [2 ]
Fukuda, David H. [1 ]
Kendall, Kristina L. [3 ]
Moon, Jordan R. [4 ]
Hoffman, Jay R. [1 ]
Wilson, Jacob M. [5 ]
Oliver, Jeffery S. [6 ]
Mustad, Vikkie A. [6 ]
机构
[1] Univ Cent Florida, Inst Exercise Physiol & Wellness Res, Orlando, FL 32816 USA
[2] Univ N Carolina, Dept Exercise & Sport Sci, Chapel Hill, NC USA
[3] Georgia So Univ, Dept Hlth & Kinesiol, Statesboro, GA 30460 USA
[4] US Sports Acad, Daphne, AL USA
[5] Univ Tampa, Dept Exercise & Sport Sci, Tampa, FL 33606 USA
[6] Abbott Nutr, Columbus, OH USA
关键词
Exercise; Fat mass; Sarcopenia; Muscle quality; beta-Hydroxy-beta-methylbutyrate; BODY-COMPOSITION; SKELETAL-MUSCLE; PROTEIN-METABOLISM; OLDER-ADULTS; STRENGTH; EXERCISE; LEUCINE; SARCOPENIA; QUALITY; HEALTH;
D O I
10.1016/j.exger.2013.08.007
中图分类号
R592 [老年病学]; C [社会科学总论];
学科分类号
03 ; 0303 ; 100203 ;
摘要
Background: Evidence suggests CaHMB may impact muscle mass and/or strength in older adults, yet no long-term studies have compared its effectiveness in sedentary and resistance training conditions. The purpose of this study was to evaluate the effects of 24 weeks of CaHMB supplementation and resistance training (3 d wk(-1)) or CaHMB supplementation only in >= 65 yr old adults. Methods: This double-blinded, placebo-controlled, trial occurred in two phases under ad libitum conditions. Phase I consisted of two non-exercise groups: (a) placebo and (b) 3 g CaHMB consumed twice daily. Phase II consisted of two resistance exercise groups: (a) placebo and resistance exercise and (b) 3 g CaHMB consumed twice daily and resistance exercise (RE). Strength and functionality were assessed in both phases with isokinetic leg extension and flexion at 60 degrees.s(-1) and 180 degrees.s(-1) (LE60, LF60, LE180, LF180), hand grip strength (HG) and get-up-and-go (GUG). Dual X-Ray Absorptiometry (DXA) was used to measure arm, leg, and total body lean mass (LM) as well as total fat mass (FM). Muscle Quality was measured for arm (MQ(HG) = HG/arm LM) and Leg (MQ(60) = LE60/leg LM) (MQ(180) = LE180/leg LM). Results: At 24 weeks of Phase I, change in LE60 (+8.8%) and MQ(180) (+20.8%) for CaHMB was significantly (p < 0.05) greater than that for placebo group. Additionally, only CaHMB showed significant (p < 0.05) improvements in total LM (2.2%), leg LM (2.1%), and LE180 (+ 17.3%), though no treatment effect was observed. Phase II demonstrated that RE significantly improved total LM (4.3%), LE60 (22.8%), LE180 (21.4%), HG (9.8%), and GUG (10.2%) with no difference between treatment groups. At week 24, only CaHMB group significantly improved FM (-3.8%) and MQ(HG) (7.3%); however there was no treatment main effect for these variables. Conclusion: CaHMB improved strength and MQ without RE. Further, RE is an effective intervention for improving all measures of body composition and functionality. (C) 2013 The Authors. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:1303 / 1310
页数:8
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