Banca de DEFESA: JÉSSICA DINIZ CAVALCANTI
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : JÉSSICA DINIZ CAVALCANTI
DATE: 30/11/2021
TIME: 14:00
LOCAL: videoconferência
TITLE:
Electrical activity and fatigue of respiratory and locomotor muscles in obstructive respiratory diseases during field walking test.
KEY WORDS:
respiratory muscles; respiratory physiology; exercise test; electromyography; respiratory tract diseases.
PAGES: 52
BIG AREA: Ciências da Saúde
AREA: Fisioterapia e Terapia Ocupacional
SUMMARY:
Introduction: In subjects with obstructive respiratory diseases, several mechanical ventilatory factors cause an imbalance between the load and capacity of the respiratory system, which worsens with the increase in ventilatory demand during exercise. As increased work of breathing can trigger greater recruitment and fatigue of respiratory muscles. Associated with these changes, lower limb muscle dysfunctions in these individuals, and competition for blood flow between respiratory and locomotor muscles, further contribute to the reported symptomatology and exercise intolerance. Surface electromyography (EMGs) measures the electrical manifestations of muscle fibers and can determine the functional state of a muscle. EMGs allow continuous and non-invasive monitoring of activation levels and muscle fatigue in real-time, through different signal processing methods. Aim: To assess muscle activity and fatigue of two respiratory and one locomotor muscle during Incremental Shuttle Walking Test (ISWT) in individuals with obstructive respiratory diseases and compare with healthy individuals. Methods: This is a case-control study. Subjects with asthma (group-Asthma) and with Chronic Obstructive Pulmonary Disease (COPD) (group-COPD) participated and were matched with subjects according to age, sex, and body mass index (Asthma control group and COPD control group). The electrical signals of the sternocleidomastoid (SCM), scalene (ESC), and rectus femoris (RF) muscles were evaluated by EMGs during the ISWT. The electrical signals were analyzed in the time and frequency domains, to extract, respectively, the signal amplitude data, at baseline and at three test times (33%, 66%, and 100% of the total time of the ISWT), and the power spectrum density (including median frequency (FM), high frequency (H) and low frequency (L) content, and H/L ratio of an electrical signal) over the ISWT. Results: Results: 17 subjects with asthma were included, (age: 34.76 ± 11.18 years; FVC: 3.37 ± 0.72 L; FEV1: 77.20 ± 17.23%) and 15 with COPD (age : 65.6 ± 7.84 years; FVC: 1.88 ± 0.44 L; FEV1: 48.72 ± 15.81%). The asthma group had a shorter distance walked compared to the control group (445.1 ± 126 m vs 607.8 ± 127 m (p = 0.0007), with no differences between the COPD and control group. Regarding the EMGs signal amplitude, there was an increase in the activation of the muscles evaluated, in the initial moments of the ISWT in the asthma group (SCM [33%: p = 0.0005 and 66%: p = 0.004], ESC [33%: p = 0.001 and 66%: p = 0.033], and RF [33%: p = 0.02 and 66%: p = 0.004]) compared to the control. In the COPD group there was an increase of respiratory muscles and remained until the end of the test (SCM [33%: p = 0.009, 66%: p = 0.023 and 100%: p = 0.023] and ESC [33%: p = 0.006, 66%: p = 0.008 and 100%: p = 0.016]) compared to the control. The RF muscle had a greater activation at the start of the ISWT ([33%: p = 0.032 and 66%: p = 0.039) in the COPD versus the control group. There was a decrease in FM in the ESC and RF muscle in the Asthma group (p = 0.016 and p < 0.0001, respectively), compared to the control group. In the COPD group, FM decreased, for ECOM and RF, with significant values for ECOM (p<0.0001), compared to the control. The H/L ratio of the RF muscle decreased (p = 0.002) in the COPD group compared to control. Conclusion: The reduced performance in the ISWT is accompanied by increased electromyographic activity of SCM and ESC and activation of RF in individuals with obstructive respiratory diseases during ISWT.
BANKING MEMBERS:
Interna - 275.782.084-20 - ARMELE DE FATIMA DORNELAS DE ANDRADE - UFPE
Externa ao Programa - 2211023 - ILLIA NADINNE DANTAS FLORENTINO LIMA
Externa à Instituição - JESSICA DANIELLE MEDEIROS DA FONSECA
Presidente - 5566309 - VANESSA REGIANE RESQUETI FREGONEZI
Externa à Instituição - VERÔNICA FRANCO PARREIRA - UFMG