期刊
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
卷 69, 期 5, 页码 567-575出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/gerona/glu023
关键词
Muscle; Sarcopenia; Cutpoints
资金
- National Institute on Aging [1U13AG041583, P30 AG024827]
- Food and Drug Administration
- Foundation of the NIH
- Abbott Nutrition
- Amgen
- Eli Lilly
- Merck
- Novartis
- Dairy Research Institute
- NIA NIH HHS [1U13AG041583, P30 AG024827] Funding Source: Medline
Low lean mass is potentially clinically important in older persons, but criteria have not been empirically validated. As part of the FNIH (Foundation for the National Institutes of Health) Sarcopenia Project, this analysis sought to identify cutpoints in lean mass by dual-energy x-ray absorptiometry that discriminate the presence or absence of weakness (defined in a previous report in the series as grip strength < 26kg in men and < 16kg in women). In pooled cross-sectional data stratified by sex (7,582 men and 3,688 women), classification and regression tree (CART) analysis was used to derive cutpoints for appendicular lean body mass (ALM) that best discriminated the presence or absence of weakness. Mixed-effects logistic regression was used to quantify the strength of the association between lean mass category and weakness. In primary analyses, CART models identified cutpoints for low lean mass (ALM < 19.75kg in men and < 15.02kg in women). Sensitivity analyses using ALM divided by body mass index (BMI: ALM(BMI)) identified a secondary definition (ALM(BMI) < 0.789 in men and ALM(BMI) < 0.512 in women). As expected, after accounting for study and age, low lean mass (compared with higher lean mass) was associated with weakness by both the primary (men, odds ratio [OR]: 6.9 [95% CI: 5.4, 8.9]; women, OR: 3.6 [95% CI: 2.9, 4.3]) and secondary definitions (men, OR: 4.3 [95% CI: 3.4, 5.5]; women, OR: 2.2 [95% CI: 1.8, 2.8]). ALM cutpoints derived from a large, diverse sample of older adults identified lean mass thresholds below which older adults had a higher likelihood of weakness.
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