Open AccessComparison of muscle quality and functional capacity between Japanese and Brazilian older individuals
Author(s) -
Hiroshi Akima,
Akito Yoshiko,
Régis Radaelli,
Madoka Ogawa,
Kaori Shimizu,
Aya Tomita,
Hisashi Maeda,
Rodrigo Neske,
Juliana Lopes Teodoro,
Kazuyuki Maeda,
Noriko Tanaka,
Ronei Silveira Pinto
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0243589
Subject(s) - medicine , stepwise regression , adipose tissue , body mass index , intramuscular fat , quality of life (healthcare) , lean body mass , linear regression , sarcopenia , endocrinology , biology , body weight , zoology , nursing , machine learning , computer science
Muscle quality is well-known to decrease with aging and is a risk factor for metabolic abnormalities. However, there is a lack of information on race-associated differences in muscle quality and other neuromuscular features related to functional performance. This study aimed to compare muscle quality, function, and morphological characteristics in Japanese and Brazilian older individuals. Eighty-four participants aged 65–87 years were enrolled in the study (42 Japanese: 23 men, 19 women, mean age 70.4 years; 42 Brazilians: 23 men, 19 women, mean age 70.8 years). Echo intensity (EI) and muscle thickness (MT) of the quadriceps femoris were measured using B-mode ultrasonography. A stepwise multiple linear regression analysis with EI as a dependent variable revealed that MT was a significant variable for Japanese participants (R 2 = 0.424, P = 0.001), while MT and subcutaneous adipose tissue (SCAT) thickness were significant variables for Brazilian participants (R 2 = 0.490, P = 0.001). A second stepwise multiple linear regression analysis was performed after excluding MT and SCAT thickness from the independent variables. Sex and age for Japanese participants (R 2 = 0.381, P = 0.001) and lean body mass and body mass index for Brazilian participants (R 2 = 0.385, P = 0.001) were identified as significant independent variables. The present results suggest that MT is closely correlated with muscle quality in Japanese and Brazilian older individuals. Increases in muscle size may induce decreases in intramuscular adipose tissue and/or connective tissues, which are beneficial for reducing the risks of metabolic impairments in Japanese and Brazilian older individuals.