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Respiratory mechanics during exercise in endurance‐trained men and women
Author(s) -
Guenette Jordan A.,
Witt Jonathan D.,
McKenzie Donald C.,
Road Jeremy D.,
Sheel A. William
Publication year - 2007
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2006.126466
Subject(s) - lung volumes , medicine , transpulmonary pressure , work of breathing , respiratory physiology , cardiology , lung , ventilation (architecture) , airway , tidal volume , respiratory system , anesthesia , mechanical engineering , engineering
The purpose of this study was to compare the mechanics of breathing including the measurement of expiratory flow limitation, end‐expiratory lung volume, end‐inspiratory lung volume, and the work of breathing in endurance‐trained men ( n = 8) and women ( n = 10) during cycle exercise. Expiratory flow limitation was assessed by applying a negative expiratory pressure at the mouth. End‐expiratory lung volume and end‐inspiratory lung volume were determined by having subjects perform inspiratory capacity manoeuvres. Transpulmonary pressure, taken as the difference between oesophageal and airway opening pressure, was plotted against volume and integrated to determine the work of breathing. Expiratory flow limitation occurred in nine females (90%) and three males (43%) during the final stage of exercise. Females had a higher relative end‐expiratory lung volume (42 ± 8 versus 35 ± 5% forced vital capacity (FVC)) and end‐inspiratory lung volume (88 ± 5 versus 82 ± 7% FVC) compared to males at maximal exercise ( P < 0.05). Women also had a higher work of breathing compared to men across a range of ventilations. On average, women had a work of breathing that was twice that of men at ventilations above 90 l min −1 . These data suggest that expiratory flow limitation may be more common in females and that they experience greater relative increases in end‐expiratory lung volume and end‐inspiratory lung volume at maximal exercise compared to males. The higher work of breathing in women is probably attributed to their smaller lung volumes and smaller diameter airways. Collectively, these findings suggest that women utilize a greater majority of their ventilatory reserve compared to men and this is associated with a higher cost of breathing.