Comparison of field- and laboratory-based estimates of muscle quality index between octogenarians and young older adults: an observational study.

Autor:	Nascimento DDC; Department of Physical Education, Catholic University of Brasilia (UCB), Brasilia, Brazil.; Department of Physical Education, Center University of Distrito Federal (UDF), Brasilia, Brazil.; Department of Gerontology, Catholic University of Brasilia (UCB), Brasilia, Brazil., Prestes J; Department of Physical Education, Catholic University of Brasilia (UCB), Brasilia, Brazil., de Sousa Diniz J; Department of Gerontology, Catholic University of Brasilia (UCB), Brasilia, Brazil., Beal PR; General Surgery, Hospital of São Paulo, UNIFESP-SP, São Paulo, Brazil., Alves VP; Department of Gerontology, Catholic University of Brasilia (UCB), Brasilia, Brazil., Stone W; Department of School of Kinesiology Recreation and Sport, Western Kentucky University, Bowling Green, FL, USA., Beal FLR; Department of Gerontology, Catholic University of Brasilia (UCB), Brasilia, Brazil.; Department of Nutrition, Health and Medicine School, Catholic University of Brasilia (UCB), Brasilia, Brazil.
Jazyk:	angličtina
Zdroj:	Journal of exercise rehabilitation [J Exerc Rehabil] 2020 Oct 27; Vol. 16 (5), pp. 458-466. Date of Electronic Publication: 2020 Oct 27 (Print Publication: 2020).
DOI:	10.12965/jer.2040668.334
Abstrakt:	Muscle quality (the ratio of strength to lean muscle mass) might be a better indicator of muscle function than strength alone. Differences in muscle quality index (MQI) between octogenarians and young older adults remain unclear. The aims of the present cross-sectional study were to compare (1) MQI between octogenarians and young older adults, (2) lab versus field-based MQI tools, and (3) determine possible confounding factors affecting MQI in older adults. Compiled data from two cross-sectional studies included 175 younger and older adults (31 men and 144 women) with a mean age of 75.93±9.49 years. Participants with age ≥80 years old were defined as octogenarians (n=79) and <80 years was defined as young older adults (n=96). Laboratory MQI was derived from the ratio of grip strength to arm muscle mass (in kg) measured by dual-energy x-ray absorptiometry. Field-based MQI was quantified from the ratio of grip strength to body mass index (BMI). Octogenarians displayed lower field ( P =0.003) and laboratory MQI ( P <0.001) as compared with young older adults. There was a strong correlation effect between field MQI and laboratory MQI ( P =0.001, R =0.85). BMI ( P =0.001), and diabetes mellitus ( P =0.001) negatively affected MQI. Women presented lower MQI ( P =0.001) values than men. In light of this information, rehabilitation specialists should consider the use of field-based MQI as a tool for evaluation and follow-up of older population. Competing Interests: CONFLICT OF INTEREST No potential conflict of interest relevant to this article was reported. (Copyright © 2020 Korean Society of Exercise Rehabilitation.)
Databáze:	MEDLINE
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