Exercise-induced respiratory resistance changes as measured with the airflow perturbation device

Respiratory resistance (Rrs) changes during physical labor can modify the work of breathing and thus influence the time that the labor can be performed. Ideal in vivo human respiratory performance measurements should have fine temporal resolution and minimally impact the respiratory system itself. T...

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Bibliographic Details
Published in:Physiological measurement 2005-02, Vol.26 (1), p.29-38
Main Authors: Silverman, Nischom K, Johnson, Arthur T, Scott, William H, Koh, Frank C
Format: Article
Language:English
Subjects:
Adolescent
Adult
Airway Resistance
Exercise - physiology
Female
Humans
Male
Maximal Expiratory Flow Rate
Respiratory Function Tests - instrumentation
Sensitivity and Specificity
Work of Breathing
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Summary:Respiratory resistance (Rrs) changes during physical labor can modify the work of breathing and thus influence the time that the labor can be performed. Ideal in vivo human respiratory performance measurements should have fine temporal resolution and minimally impact the respiratory system itself. The airflow perturbation device (APD) provides respiratory resistance measurements in this manner. Pre-exercise Rrs was compared with post-exercise Rrs, continuously monitored for 6 min in 12 non-asthmatic subjects. Rrs following exercise at 70-75% VO2max was below pre-exercise levels for 40 s into recovery (p < 0.05) and inhalation resistance differed more markedly than exhalation resistance. The same post-exercise Rrs decline was found when Rrs measurements were compared to those taken during flow rates comparable to those found late in recovery. Results indicate that (1) Rrs indeed declines following exercise in non-asthmatic subjects, probably due to bronchial dilation, (2) Rrs changes can occur on short time scales, (3) Rrs changes are not related primarily to flow rate.
ISSN:0967-3334
1361-6579
DOI:10.1088/0967-3334/26/1/003