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The pattern and timing of breathing during incremental exercise: a normative study

¹ Pulmonary Function and Clinical Exercise Physiology Unit, Respiratory Division, Dept of Medicine, Federal University of São Paulo, Paulista School of Medicine, São Paulo, Brazil. ² Centre for Exercise Science and Medicine, Institute of Biological and Life Sciences, University of Glasgow, Glasgow, UK

CORRESPONDENCE: J.A. Neder, Pulmonary Function and Clinical Exercise Physiology Unit, Respiratory Division, Federal University of São Paulo, Rua Francisco de Castro 54, 04020-050, São Paulo, Brazil. Fax: 55 1155752843. E-mail: albneder@pneumo.epm.br

Keywords: breathing pattern, cardiopulmonary exercise testing, exercise, normal values, ventilation

Received: May 29, 2002
Accepted October 4, 2002

This study was supported, in part, by research grants from the State of São Paulo Research Foundation (FAPESP), São Paulo, (CNPq) Brazil/the National Council of Scientific and Technological Development, Brasília, Brazil. J.A. Neder was supported by a post-doctoral research fellowship grant (No. 95/9843-0) from FAPESP, Brazil.

Clinical evaluation of the pattern and timing of breathing during submaximal exercise can be valuable for the identification of the mechanical ventilatory consequences of different disease processes and for assessing the efficacy of certain interventions.

Sedentary individuals (60 male/60 female, aged 20–80 yrs) were randomly selected from >8,000 subjects and submitted to ramp incremental cycle ergometry. Tidal volume (V_T)/ resting inspiratory capacity, respiratory frequency, total respiratory time (T_tot), inspiratory time (T_I), expiratory time (T_E), duty cycle (T_I/T_tot) and mean inspiratory flow (V_T/T_I) were analysed at selected submaximal ventilatory intensities.

Senescence and female sex were associated with a more tachypnoeic breathing pattern during isoventilation. The decline in T_tot was proportional to the T_I and T_E reductions, i.e. T_I/T_tot was remarkably constant across age strata, independent of sex. The pattern, but not timing, of breathing was also influenced by weight and height; a set of demographically and anthropometrically based prediction equations are therefore presented.

These data provide a frame of reference for assessing the normality of some clinically useful indices of the pattern and timing of breathing during incremental cycle ergometry in sedentary males and females aged 20–80 yrs.

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