Differences between remaining ability and loss of capacity in maximum aerobic impairment

Differences between remaining ability and loss of capacity in maximum aerobic impairment

Author Neder, Jose Alberto Autor UNIFESP Google Scholar
Nery, Luiz Eduardo Autor UNIFESP Google Scholar
Bagatin, Edileia Autor UNIFESP Google Scholar
Lucas, Sandra Regina Rodrigues Autor UNIFESP Google Scholar
Anção, Meide Silva Autor UNIFESP Google Scholar
Sue, D.y. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual de Campinas (UNICAMP)
Harbor-UCLA Medical Center
Abstract In the evaluation of exercise intolerance of patients with respiratory diseases the American Medical Association (AMA) and the American Thoracic Society (ATS) have proposed similar classifications for rating aerobic impairment using maximum oxygen uptake (VO2max) normalized for total body weight (ml min-1 kg-1). However, subjects with the same VO2max weight-corrected values may have considerably different losses of aerobic performance (VO2max expressed as % predicted). We have proposed a new, specific method for rating loss of aerobic capacity (VO2max, % predicted) and we have compared the two classifications in a prospective study involving 75 silicotic claimants. Logistic regression analysis showed that the disagreement between rating systems (higher dysfunction by the AMA/ATS classification) was associated with age >50 years (P<0.005) and overweight (P = 0.04). Interestingly, clinical (dyspnea score) and spirometric (FEV1) normality were only associated with the VO2max, % predicted, normal values (P<0.01); therefore, in older and obese subjects the AMA/ATS classification tended to overestimate the aerobic dysfunction. We conclude that in the evaluation of aerobic impairment in patients with respiratory diseases, the loss of aerobic capacity (VO2max, % predicted) should be used instead of the traditional method (remaining aerobic ability, VO2max, in ml min-1 kg-1).
Keywords disability evaluation
work capacity
exercise tolerance
oxygen consumption
occupational diseases
Language English
Date 1998-05-01
Published in Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 31, n. 5, p. 639-646, 1998.
ISSN 0100-879X (Sherpa/Romeo, impact factor)
Publisher Associação Brasileira de Divulgação Científica
Extent 639-646
Origin http://dx.doi.org/10.1590/S0100-879X1998000500006
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000073802500006
SciELO ID S0100-879X1998000500006 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/621

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