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KMID : 1139220200160050458
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Journal of Exercise Rehabilitation
2020 Volume.16 No. 5 p.458 ~ p.466
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Comparison of field- and laboratory-based estimates of muscle quality index between octogenarians and young older adults: an observational study
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da Cunha Nascimento Dahan
Prestes Jonato
de Sousa Diniz Joyce
Beal Pedro Rodrigues
Alves Vicente Paulo
Stone Whitley
Beal Fabiani Lage Rodrigues
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Abstract
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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.
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KEYWORD
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Muscle mass, Older adults, Handgrip, Aging
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