PMID: 22576435May 12, 2012Paper

Diurnal variations in the parameters of pulmonary function and respiratory muscle strength in patients with COPD

Jornal brasileiro de pneumologia : publicaça̋o oficial da Sociedade Brasileira de Pneumologia e Tisilogia
Guilherme FregoneziAntonio Fernando Brunetto

Abstract

To evaluate the magnitude of diurnal changes in the parameters of pulmonary function and respiratory muscle strength/endurance in a sample of patients with COPD. A group of 7 patients underwent spirometry, together with determination of MIP and MEP, at two distinct times (between 8:00 and 8:30 a.m. and between 4:30 and 5:00 p.m.) on a single day. Between assessments, the patients remained at rest in the laboratory. In accordance with the Global Initiative for Chronic Obstructive Pulmonary Disease staging system, COPD was classified as moderate, severe, and very severe in 1, 3, and 3 of the patients, respectively. From the first to the second assessment, there were significant decreases in FVC, FEV1, and MEP (of 13%, 15%, and 10%, respectively), as well as (less than significant) decreases in PEF, MIP, and maximal voluntary ventilation (of 9%, 3%, and 11%, respectively). In this sample of COPD patients, there were diurnal variations in the parameters of pulmonary function and respiratory muscle strength. The values of FEV1, FVC, and MEP were significantly lower in the afternoon than in the morning.

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Citations

Aug 24, 2018·Journal of Cardiopulmonary Rehabilitation and Prevention·Zohra ParwantaVéronique Pepin
Oct 16, 2019·American Journal of Respiratory and Critical Care Medicine·Brian L GrahamBruce R Thompson
Sep 12, 2014·Nature Communications·Jeffrey A HaspelAugustine M K Choi
Jul 18, 2014·Medicine and Science in Sports and Exercise·Thomas U WüthrichChristina M Spengler
Feb 3, 2015·Journal of Physical Therapy Science·Min-Hyung Rhee, Laurentius Jongsoon Kim
Jan 10, 2021·The European Respiratory Journal·Imre NothUNKNOWN INMARK trial investigators

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