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

Full Abstract

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 (VT)/resting inspiratory capacity, respiratory frequency, total respiratory time (Ttot), inspiratory time (TI), expiratory time (TE), duty cycle (TI/Ttot) and mean inspiratory flow (VT/TI) were analysed at selected submaximal ventilatory intensities. Senescence and female sex were associated with a more tachypnoeic breathing pattern during isoventilation. The decline in Ttot was proportional to the TI and TE reductions, i.e. TI/Ttot 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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Author information

Author/s: Neder, J A (JA); Dal Corso, S (S); Malaguti, C (C); Reis, S (S); De Fuccio, M B (MB); Schmidt, H (H); Fuld, J P (JP); Nery, L E (LE);

Affiliation: Pulmonary Function and Clinical Exercise Physiology Unit, Respiratory Division, Dept of Medicine, Federal University of São Paulo, Paulista School of Medicine, São Paulo, Brazil. albneder(-atsign-)pneumo.epm.br

Journal and publication information

Publication Type: Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't

Journal: The European respiratory journal : official journal of the European Society for Clinical Respiratory Physiology (Eur Respir J), published in Denmark. (Language: eng)

Reference: 2003-Mar; vol 21 (issue 3) : pp 530-8

Dates: Created 2003/03/28; Completed 2003/06/26; Revised 2008/11/21;

PMID: 12662013, status: MEDLINE (last retrieval date: 12/26/2008)

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