Effect of ¦Â-hydroxy-¦Â-methylbutyrate (HMB) on lean body mass during 10 days of bed rest in older adults

详细信息    查看全文

• 作者：Nicolaas E.P. Deutz ; Suzette L. Pereira ; Nicholas P. Hays ; Jeffery S. Oliver ; Neile K. Edens ; Chris M. Evans ; Robert R. Wolfe
• 关键词：Muscle ; Body composition ; Protein synthesis ; HMB ; Beta-hydroxy-beta-methylbutyrate
• 刊名：Clinical Nutrition
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：32
• 期：5
• 页码：704-712
• 全文大小：334 K

文摘

| Figures/TablesFigures/Tables | ReferencesReferences

Summary

Background

Loss of muscle mass due to prolonged bed rest decreases functional capacity and increases hospital morbidity and mortality in older adults.

Objective

To determine if HMB, a leucine metabolite, is capable of attenuating muscle decline in healthy older adults during complete bed rest.

Design

A randomized, controlled, double-blinded, parallel-group design study was carried out in 24 healthy (SPPB?¡Ý?9) older adult subjects (20 women, 4 men), confined to complete bed rest for ten days, followed by resistance training rehabilitation for eight weeks. Subjects in the experimental group were treated with HMB (calcium salt, 1.5?g twice daily - total 3?g/day). Control subjects were treated with an inactive placebo powder. Treatments were provided starting 5 days prior to bed rest till the end rehabilitation phase. DXA was used to measure body composition.

Results

Nineteen eligible older adults (BMI: 21-33; age: 60-76?year) were evaluable at the end of the bed rest period (Control n?=?8; Ca-HMB n?=?11). Bed rest caused a significant decrease in total lean body mass (LBM) (2.05?¡À?0.66?kg; p?=?0.02, paired t-test) in the Control group. With the exclusion of one subject, treatment with HMB prevented the decline in LBM over bed rest ?0.17?¡À?0.19?kg; p?=?0.23, paired t-test). There was a statistically significant difference between treatment groups for change in LBM over bed rest (p?=?0.02, ANOVA). Sub-analysis on female subjects (Control?=?7, HMB?=?8) also revealed a significant difference in change in LBM over bed rest between treatment groups (p?=?0.04, ANOVA). However, differences in function parameters could not be observed, probably due to the sample size of the study.

Conclusions

In healthy older adults, HMB supplementation preserves muscle mass during 10 days of bed rest. These results need to be confirmed in a larger trial.

This trial is registered at under NCT00945581.