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

Journal of Exercise Rehabilitation 2020년 16권 5호 p.458 ~ 466
da Cunha Nascimento Dahan, Prestes Jonato, de Sousa Diniz Joyce, Beal Pedro Rodrigues, Alves Vicente Paulo, Stone Whitley, Beal Fabiani Lage Rodrigues,
소속 상세정보
 ( da Cunha Nascimento Dahan ) - Catholic University of Brasilia Department of Physical Education
 ( Prestes Jonato ) - Catholic University of Brasilia Department of Physical Education
 ( de Sousa Diniz Joyce ) - Catholic University of Brasilia Department of Gerontology
 ( Beal Pedro Rodrigues ) - UNIFESP-SP Hospital of Sao Paulo General Surgery
 ( Alves Vicente Paulo ) - Catholic University of Brasilia Department of Gerontology
 ( Stone Whitley ) - Western Kentucky University Department of School of Kinesiology Recreation and Sport
 ( Beal Fabiani Lage Rodrigues ) - Catholic University of Brasilia Department of Gerontology

Abstract


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 fieldbased MQI as a tool for evaluation and follow-up of older population.

키워드

Muscle mass; Older adults; Handgrip; Aging

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