Maximal aerobic power and leg muscle mass and strength related to age in non-athletic males and females

Maximal aerobic power and leg muscle mass and strength related to age in non-athletic males and females

Autor Neder, J. A. Google Scholar
Nery, L. E. Google Scholar
Silva, A. C. Google Scholar
Andreoni, S. Google Scholar
Whipp, B. J. Google Scholar
Instituição Univ London St Georges Hosp
Universidade Federal de São Paulo (UNIFESP)
Resumo To investigate the relationships between the age-associated decline in peak oxygen uptake (peak (V)over dot O-2), leg muscle mass (LMM) and leg strength (LS) under the modulating effect of gender and level of physical activity (LPA, as assessed by questionnaire), we evaluated 71 sedentary subjects [males(M):females(F), 34:37], aged 20-80 years. Peak (V)over dot O-2 at maximum cycle ergometry was related to LMM (dual energy X-ray absorptiometry) and LS (isokinetic dynamometry) using both standard (y . x(-1)) and power function ratios (allometry). Absolute values of all variables were higher in males and declined with age (P < 0.01). Differences between the genders disappeared after peak (V)over dot O-2 . LS-1.46 (M) or -1.62 (F) adjustment but remained significant between peak (V)over dot O-2 . LMM-(-0.51 (M) or -0.45 (F)) and LS . LMM-(-0.91 (M) or -1.10 (F)) corrected values. Allometric correction of peak (V)over dot O-2 and LS by LMM slowed their age-related declines; the flattening effect however, was more evident in the females. Interestingly, while no age-related decrement in peak (V)over dot O-2 . LS-1 was found, power function ratio values also declined with age, and at a slower rate in females. These findings are consistent with those obtained following a multiple regression analysis using LPA as an independent covariate (P < 0.01). We conclude that using adequate scaling methods and controlling by LPA: (1) no fender differences are observed in peak (V)over dot O-2 adjusted for LS, (2) loss of LS and LMM are important determinants of the age-associated reduction in physical fitness in both genders but (3) age per se has an LS- and LMM-independent influence on the functional decline, although this intrinsic effect of senescence is less pronounced in females.
Palavra-chave oxygen consumption
isokinetic strength
body composition
cycle ergometry
Idioma Inglês
Data de publicação 1999-05-01
Publicado em European Journal of Applied Physiology and Occupational Physiology. New York: Springer Verlag, v. 79, n. 6, p. 522-530, 1999.
ISSN 0301-5548 (Sherpa/Romeo, fator de impacto)
Publicador Springer
Extensão 522-530
Fonte http://dx.doi.org/10.1007/s004210050547
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000080106100010
Endereço permanente http://repositorio.unifesp.br/handle/11600/26071

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