Daily Leucine Intake Is Positively Associated with Lower Limb Skeletal Muscle Mass and Strength in the Elderly

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art_LIXANDRAO_Daily_Leucine_Intake_Is_Positively_Associated_with_Lower_2021.PDF (472.38 KB)
Citações na Scopus
7
Tipo de produção
article
Data de publicação
2021
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
MDPI
Autores
LEITAO, Alice E.
MORAIS, Joao V. M.
SWINTON, Paul A.
AIHARA, Andre Y.
GOES, Paola C. K.
UGRINOWITSCH, Carlos
CANDOW, Darren G.
Citação
NUTRIENTS, v.13, n.10, article ID 3536, 7p, 2021
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Higher daily protein intake, with an emphasis on leucine content, is thought to mitigate age-related anabolic resistance, potentially counteracting age-related morphological and functional declines. The present study investigated potential associations between total daily leucine intake and dependent variables, including quadriceps muscle cross-sectional area (CSA) and maximum dynamic muscle strength (1-RM) in a cohort of healthy free-living older individuals of both sexes (n = 67; 34/33 men/women). Participants performed three 24 h dietary recalls and underwent a magnetic resonance imaging exam followed by 1-RM tests. Our results demonstrate moderate associations between total daily leucine and both quadriceps CSA (r = 0.42; p = 0.004) and 1-RM (r = 0.45; p = 0.001). Furthermore, our exploratory biphasic linear regression analyses, adjusted for sex, age, and protein intake relative to body weight, revealed a plateau for daily leucine intake and muscle mass and muscle strength (~7.6-8.0 g & BULL;day(-1)) in older adults. In conclusion, we demonstrated that total daily leucine intake is associated with muscle mass and strength in healthy older individuals and this association remains after controlling for multiple factors, including overall protein intake. Furthermore, our breakpoint analysis revealed non-linearities and a potential threshold for habitual leucine intake, which may help guide future research on the effects of chronic leucine intake in age-related muscle loss.</p>
Palavras-chave
protein intake, aging, muscle function, essential amino acids, older individuals
URI
https://observatorio.fm.usp.br/handle/OPI/44237
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Coleções
Artigos e Materiais de Revistas Científicas - LIM/17
Artigos e Materiais de Revistas Científicas - FM/MCM
Artigos e Materiais de Revistas Científicas - HC/ICHC