Document Detail


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.
MedLine Citation:
PMID:  23981904     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 24weeks of CaHMB supplementation and resistance training (3 d∙wk(-1)) or CaHMB supplementation only in ≥65yr 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) 3g CaHMB consumed twice daily. Phase II consisted of two resistance exercise groups: (a) placebo and resistance exercise and (b) 3g CaHMB consumed twice daily and resistance exercise (RE). Strength and functionality was assessed in both phases with isokinetic leg extension and flexion at 60° s(-1) and 180° 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 (MQHG=HG/arm LM) and Leg (MQ60=LE60/leg LM) (MQ180=LE180/leg LM).
RESULTS: At 24weeks of Phase I, change in LE60 (+8.8%) and MQ180 (+20.8%) for CaHMB was significantly (p<0.05) greater than 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 MQHG (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.
Authors:
Jeffrey R Stout; Abbie E Smith-Ryan; David H Fukuda; Kristina L Kendall; Jordan R Moon; Jay R Hoffman; Jacob M Wilson; Jeffery S Oliver; Vikkie A Mustad
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-8-24
Journal Detail:
Title:  Experimental gerontology     Volume:  -     ISSN:  1873-6815     ISO Abbreviation:  Exp. Gerontol.     Publication Date:  2013 Aug 
Date Detail:
Created Date:  2013-8-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0047061     Medline TA:  Exp Gerontol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013.
Affiliation:
Institute for Exercise Physiology and Wellness Research, University of Central Florida, Orlando, FL, USA. Electronic address: jeffrey.stout@ucf.edu.
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