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Type: Journal article
Title: The effect of huffing and directed coughing on energy expenditure in young asymptomatic subjects
Author: Pontifex, E.
Williams, M.
Lunn, R.
Parsons, D.
Citation: Journal of Physiotherapy, 2002; 48(3):209-213
Publisher: Australian Physiotherapy Assoc
Issue Date: 2002
ISSN: 0004-9514
Statement of
Edward Pontifex, Marie T Williams, Rebecca Lunn and David Parsons
Abstract: Coughing and huffing have been shown to be effective airway clearance techniques and some authors have anecdotally reported that a huff requires less energy than a series of coughs commencing and finishing at the same lung volume. The aim of this study was to determine whether there is a difference in the energy expenditure between periods of huffing and directed voluntary coughing commencing from the same initial lung volume in young asymptomatic subjects. Energy expenditure was measured using open-circuit indirect calorimetry equipment. Twenty-four non-smoking asymptomatic subjects (12 male, 12 female, aged 18-24 years), without any form of disease and within 10% of their predicted pulmonary function, completed the study. Energy expenditure was measured over three 10min, randomly ordered sessions of huffing, directed coughing and rest. The forced expiratory sessions comprised a single huff or double-barrel cough (both starting at total lung capacity) at the end of every two minutes. Each session was separated by a 5min washout period. No significant difference in energy expenditure was found between the huffing and directed coughing periods (mean difference 0.003 mL/kg/min (95% CI -0.160 to 0.114) and both produced significantly greater energy expenditure than rest (rest and huff mean difference 0.309 mL/kg/min (95% CI 0.080 to 0.549) and rest and cough mean difference 0.306 mL/kg/min (95% CI 0.074 to 0.508)). The suggested benefits of huffing versus coughing in terms of energy conservation are yet to be shown.
Keywords: Cough
Energy Metabolism
Lung Volume Measurement
Respiratory Disorders
Rights: © Australian Physiotherapy Association
DOI: 10.1016/S0004-9514(14)60225-7
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