The effect of age on the power/duration relationship and the intensity-domain limits in sedentary men

The effect of age on the power/duration relationship and the intensity-domain limits in sedentary men

Autor Neder, J. A. Google Scholar
Jones, P. W. Google Scholar
Nery, L. E. Google Scholar
Whipp, B. J. Google Scholar
Instituição Univ Glasgow
Univ London St Georges Hosp
Universidade Federal de São Paulo (UNIFESP)
Resumo The time to fatigue (t) in response to high-intensity constant-load exercise decreases hyperbolically with increasing power ((W) over dot) at least in active and younger individuals [i.e. ((W) over dot - theta(F))t = W', where theta(F) is the critical power asymptote and W' is the curvature constant]. Little is known. however, about the combined effects of age and sedetarity on these parameters. We therefore evaluated 17 non-trained males (9 aged 60-75 years and 8 aged below 30 years) who underwent ramp-incremental cycle ergometry and, on different days, 4 high-intensity constant-load tests to t. Compared to their younger counterparts, the older subjects presented significantly lower maximum oxygen uptake (i.e. the maximum value of oxygen uptake attained at the end of a progressive exercise with the subject exerting a presumably maximal effort, mu(V) over dot O-2), estimated lactate threshold ((V) over dot O(2)theta(L)), (V) over dot O(2)theta(F), and W' (P < 0.05). Interestingly, however, both (V) over dot O(2)theta(L) and (V) over dot O(2)theta(F), when expressed as a percentage of mu(V) over dot O-2, were higher in older than in younger men [61.8 (6.2)% versus 45.4 (4.6)% and 87.8 (7.3)% versus 79.0 (8.2)%, P < 0.05, respectively]. Therefore, age was associated with an increase in the relative magnitude of the moderate, sub-theta(L) exercise-intensity domain (+30.4%), mainly at the expense of the very-heavy, supra-theta(F) domain (-56%). Our results demonstrate that age and sedentarity are associated with: (1) marked reductions in both the aerobic (theta(F)) and anaerobic (W') determinants of the (W) over dot /t relationship, and (2) changes in either the absolute or relative magnitudes of the exercise-intensity domains. These findings are consistent with the notion that endurance-related parameters are less diminished with ageing than the maximal capacity, thereby mitigating the deleterious effects or senescence in the functional capacity.
Palavra-chave critical power
ageing
oxygen consumption
exercise
Idioma Inglês
Data de publicação 2000-07-01
Publicado em European Journal of Applied Physiology. New York: Springer-verlag, v. 82, n. 4, p. 326-332, 2000.
ISSN 1439-6319 (Sherpa/Romeo, fator de impacto)
Publicador Springer
Extensão 326-332
Fonte http://dx.doi.org/10.1007/s004210000228
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000088602900011
Endereço permanente http://repositorio.unifesp.br/handle/11600/26334

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