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

    Authors

    J. R. Stout; A. E. Smith-Ryan; D. H. Fukuda; K. L. Kendall; J. R. Moon; J. R. Hoffman; J. M. Wilson; J. S. Oliver;V. A. Mustad

    Comments

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    Abbreviated Journal Title

    Exp. Gerontol.

    Keywords

    Exercise; Fat mass; Sarcopenia; Muscle quality; beta-Hydroxy-beta-methylbutyrate; ESSENTIAL AMINO-ACIDS; BODY-COMPOSITION; SKELETAL-MUSCLE; PROTEIN-METABOLISM; OLDER-ADULTS; STRENGTH; SARCOPENIA; EXERCISE; LEUCINE; AGE; Geriatrics & Gerontology

    Abstract

    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.

    Journal Title

    Experimental Gerontology

    Volume

    48

    Issue/Number

    11

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    1303

    Last Page

    1310

    WOS Identifier

    WOS:000325750900022

    ISSN

    0531-5565

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