In:
PLOS ONE, Public Library of Science (PLoS), Vol. 17, No. 4 ( 2022-4-1), p. e0266365-
Abstract:
In subjects with obstructive respiratory diseases the increased work of breathing during exercise can trigger greater recruitment and fatigue of respiratory muscles. Associated with these changes, lower limb muscle dysfunctions, further contribute to exercise limitations. We aimed to assess electrical 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. Methods This is a case-control study. Seventeen individuals with asthma (asthma group) and fifteen with chronic obstructive pulmonary disease (COPD group) were matched with healthy individuals (asthma and COPD control groups). Surface electromyographic (sEMG) activity of sternocleidomastoid (SCM), scalene (ESC), and rectus femoris (RF) were recorded during ISWT. sEMG activity was analyzed in time and frequency domains at baseline and during the test (33%, 66%, and 100% of ISWT total time) to obtain, respectively, signal amplitude and power spectrum density (EMG median frequency [MF], high- and low-frequency bands, and high/low [H/L] ratio). Results Asthma group walked a shorter distance than controls (p = 0.0007). sEMG amplitudes of SCM, ESC, and RF of asthma and COPD groups were higher at 33% and 66% of ISWT compared with controls groups (all p 〈 0.05). SCM and ESC of COPD group remained higher until 100% of the test. MF of ESC and RF decreased in asthma group (p = 0.016 and p 〈 0.0001, respectively) versus controls, whereas MF of SCM (p 〈 0.0001) decreased in COPD group compared with controls. H/L ratio of RF decreased (p = 0.002) in COPD group versus controls. Conclusion Reduced performance is accompanied by increased electromyographic activity of SCM and ESC and activation of RF in individuals with obstructive respiratory diseases during ISWT. These are susceptible to be more pronounced respiratory and peripheral muscle fatigue than healthy subjects during exercise.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0266365
DOI:
10.1371/journal.pone.0266365.g001
DOI:
10.1371/journal.pone.0266365.g002
DOI:
10.1371/journal.pone.0266365.g003
DOI:
10.1371/journal.pone.0266365.g004
DOI:
10.1371/journal.pone.0266365.g005
DOI:
10.1371/journal.pone.0266365.g006
DOI:
10.1371/journal.pone.0266365.t001
DOI:
10.1371/journal.pone.0266365.t002
DOI:
10.1371/journal.pone.0266365.t003
DOI:
10.1371/journal.pone.0266365.t004
DOI:
10.1371/journal.pone.0266365.s001
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2022
detail.hit.zdb_id:
2267670-3
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