Replacing sedentary time for physical activity: Does intensity matter for body composition in oldest-old adults?
J Sports Sci
; 42(6): 537-546, 2024 Mar.
Article
em En
| MEDLINE
| ID: mdl-38696674
ABSTRACT
To assess the independent and combined relationships among objectively measured sedentary time (ST), light intensity PA (LPA), and moderate-to-vigorous intensity PA (MVPA) with muscle mass and fat mass (FM) and how theoretical displacement of these inter-dependent behaviours relates to body composition in oldest-old men. A total of 1046 men participating in the year 14 visit of the prospective Osteoporotic Fractures in Men (MrOS) cohort study with complete data for accelerometry, dual x-ray absorptiometry, and deuterated creatine dilution (D3Cr) muscle mass were included in the analysis (84.0 ± 3.8 yrs.). Single, partition, and isotemporal substitution models were used to assess the interrelationships between PA intensities and ST with body composition measures, while controlling for relevant confounders. Replacing 30-min of ST with 30-min of MVPA was associated with lower FM (ß =-0.17, p < 0.001) and higher D3Cr muscle mass, although this was of borderline significance (ß = 0.07, p = 0.05). Replacing 30-min of ST for LPA was associated with lower FM (ß =-0.15, p < 0.001), but there was no effect on D3Cr muscle mass (p > 0.05). Exchanging ST with any intensity of PA is associated with benefits for FM in oldest-old adult men, although substitution with MVPA may be more beneficial than LPA for maintaining/improving skeletal muscle mass.
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Base de dados:
MEDLINE
Assunto principal:
Composição Corporal
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Exercício Físico
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Absorciometria de Fóton
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Músculo Esquelético
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Comportamento Sedentário
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Acelerometria
Limite:
Aged80
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Humans
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Male
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article