4.6 Article

Pulmonary diffusion and aerobic capacity: is there a relation? Does obesity matter?

期刊

ACTA PHYSIOLOGICA
卷 198, 期 4, 页码 499-507

出版社

WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1748-1716.2009.02059.x

关键词

carbon monoxide; exercise; fat; fitness; lung; nitric oxide

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Aim: We sought to determine whether pulmonary diffusing capacity for nitric oxide (DLNO), carbon monoxide (DLCO) and pulmonary capillary blood volume (Vc) at rest predict peak aerobic capacity ((V) over dotO(2peak)), and if so, to discern which measure predicts better. Methods: Thirty-five individuals with extreme obesity (body mass index or BMI = 50 +/- 8 kg m(-2)) and 26 fit, non-obese subjects (BMI = 23 +/- 2 kg m(-2)) participated. DLNO and DLCO at rest were first measured. Then, subjects performed a graded exercise test on a cycle ergometer to determine (V) over dotO(2peak). Multivariate regression was used to assess relations in the data. Results: Findings indicate that (i) pulmonary diffusion at rest predicts (V) over dotO(2peak) in the fit and obese when measured with DLNO, but only in the fit when measured with DLCO; (ii) the observed relation between pulmonary diffusion at rest and (V) over dotO(2peak) is different in the fit and obese; (iii) DLNO explains (V) over dotO(2peak) better than DLCO or Vc. The findings imply the following reference equations for DLNO: (V) over dotO(2peak) (mL kg(-1) min(-1)) = 6.81 + 0.27 x DLNO for fit individuals; (V) over dotO(2peak) (mL kg(-1) min(-1)) = 6.81 + 0.06 x DLNO, for obese individuals (in both groups, adjusted R(2) = 0.92; RMSE = 5.58). Conclusion: Pulmonary diffusion at rest predicts (V) over dotO(2peak), although a relation exists for obese subjects only when DLNO is used, and the magnitude of the relation depends on gender when either DLCO or Vc is used. We recommend DLNO as a measure of pulmonary diffusion, both for its ease of collection as well as its tighter relation with (V) over dotO(2peak).

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