Original article
Evaluation of dose–response relationship between smoking load and cardiopulmonary fitness in adult smokers: A cross-sectional study
V.T. Lauriaa,, , E.F. Sperandioa, T.L.W. de Sousaa, W. de Oliveira Vieiraa, M. Romitib, A.R. de Toledo Gagliardib, R.L. Arantesb, V.Z. Douradoa
a Laboratory of Epidemiology and Human Movement (EPIMOV), Federal University of São Paulo, Santos, Brazil
b Angiocorpore Institute of Cardiovascular Medicine, Santos, Brazil
Received 02 June 2016, Accepted 22 November 2016
Abstract
Objective

To evaluate the dose–response relationship between smoking load and cardiopulmonary fitness, as measured with cardiopulmonary exercise testing (CPET), in adult smokers free of respiratory diseases.

Methods

After a complete clinical evaluation and spirometry, 95 adult smokers (35 men and 60 women) underwent CPET on a treadmill.

Results

The physiological responses during CPET showed lower cardiorespiratory fitness levels, regardless of smoking load, with a peak V′O2 lower than 100% of the expected value and a lower maximum heart rate. We observed a significant moderate negative correlation between smoking load and peak V′O2. The smoking load also presented a significant negative correlation with maximum heart rate(r=−0.36; p<0.05), lactate threshold(r=−0.45; p<0.05), and peak ventilation(r=−0.43; p<0.05). However, a dose–response relationship between smoking load quartiles and cardiopulmonary fitness was not found comparing quartiles of smoking loads after adjustment for age, sex and cardiovascular risk.

Conclusion

There appears to be no dose–response relationship between SL and cardiopulmonary fitness in adult smokers with preserved pulmonary function, after adjusting the analysis for age and cardiovascular risk. Our results suggest that smoking cessation might be useful as the primary strategy to prevent cardiopulmonary fitness decline in smokers, regardless of smoking load. Thus, even a very low dose of tobacco use must be avoided in preventive strategies focusing on becoming people more physically active and fit.

Keywords
Smoking load, Cardiopulmonary exercise testing, Spirometry, Physical fitness, Tobacco use disorder

Metrics

  • Impact Factor: 1.560(2016)
  • 5-years Impact Factor: 1,100
  • SCImago Journal Rank (SJR):0,29
  • Source Normalized Impact per Paper (SNIP):0,685