PT  - JOURNAL ARTICLE
AU  - Danielle Vieira
AU  - Mariana Hoffman
AU  - Danielle Pereira
AU  - Lorena Vaz
AU  - Marcelo Velloso
AU  - Raquel Britto
AU  - Carolina Marinho
AU  - Andre Albuquerque
AU  - Veronica Parreira
TI  - Asynchronous movement of the lower rib cage at two exercise intensities in patients with COPD
DP  - 2013 Sep 01
TA  - European Respiratory Journal
PG  - P3173
VI  - 42
IP  - Suppl 57
4099  - http://erj.ersjournals.com/content/42/Suppl_57/P3173.short
4100  - http://erj.ersjournals.com/content/42/Suppl_57/P3173.full
SO  - Eur Respir J2013 Sep 01; 42
AB  - Introduction: The occurrence and importance of asynchronous movement of the lower rib cage at exercise intensities frequently used in pulmonary rehabilitation are not clear and have been poorly investigated in COPD patients. Aims: To evaluate lower rib cage asynchrony and chest wall operational volumes during exercise on a cycle ergometer at 60% and 80% of peak work rate in patients with COPD. Methods: Seven male patients (63±5 ys old, FEV1 45±15% of predicted) underwent a symptom-limited incremental test on a cycle ergometer followed by the two constant rate tests in a random order. Tests were performed on different occasions two to fifteen days apart. A gas analyzer(Medical Graphics CPX Ultima) and an optoelectronic plethysmography system(BTS Bioengineering) were continuously used. Phase angle, inspiratory (PhRIB) and expiratory (PhREB) phase ratio were the variables used to assess asynchrony. Data was analyzed at rest and at 33%, 66% and 100% of the total exercise time. Mixed factorial ANOVA, Friedman and Wilcoxon were used (p<0.05). This study was approved by the Ethics Committee. Results: End-inspiratory chest wall volume and PhRIB and PhREB of the lower rib cage similarly increased (p<0.05) during both constant rate tests without statistical differences in the comparison between the two tests. End-expiratory volume increased significantly during the tests only for the rib cage compartment and no significant changes were observed for the total chest wall volumes. Conclusions: Lower rib cage asynchrony was observed even at lower work rates and it seemed not to impact negatively on the capacity of patients with COPD to sustain both exercise intensities.Support: CNPq, CAPES, FAPEMIG.