scholarly journals Differences in respiratory muscle activity during cycling and walking do not influence dyspnea perception in obese patients with COPD

2014 ◽  
Vol 117 (11) ◽  
pp. 1292-1301 ◽  
Author(s):  
Casey E. Ciavaglia ◽  
Jordan A. Guenette ◽  
Daniel Langer ◽  
Katherine A. Webb ◽  
J. Alberto Neder ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Respiratory Muscle ◽  
Body Position ◽  
Balloon Catheter ◽  
Work Rate ◽  
Abdominal Muscles ◽  
Obese Patients ◽  
Exercise Tests ◽  
Respiratory Muscle Activity

In patients with combined obesity and chronic obstructive pulmonary disease (COPD), dyspnea intensity at matched work rates during weight-supported cycling and weight-bearing walking is similar, despite consistent metabolic differences between test modalities. The present study examined the influence of differences in activity of the diaphragm and abdominal muscles during cycling and walking on intensity and quality of dyspnea at matched ventilation in obese patients with COPD. We compared respiratory muscle activity patterns and dyspnea ratings during incremental cycle and treadmill exercise tests, where work rate was matched, in 12 obese (body mass index 36.6 ± 5.4 kg/m2; mean ± SD) patients with moderate COPD. We used a multipair electrode-balloon catheter to compare electromyography of the diaphragm and esophageal, gastric, and transdiaphragmatic pressures during the two exercise tests. Ventilation, breathing pattern, operating lung volumes, global respiratory effort, and electrical activation of the diaphragm were similar across exercise modalities for a given work rate. The cycling position was associated with greater neuromuscular efficiency of the diaphragm ( P < 0.01), greater diaphragm use ( P < 0.01) measured by the ventilatory muscle recruitment index, and less expiratory muscle activity compared ( P < 0.01) with treadmill walking. However, intensity and quality of dyspnea were similar between exercise modalities. In obese patients with COPD, altered respiratory muscle activity due to body position differences between cycling and walking did not modulate perceived dyspnea when indirect measures of respiratory neural drive were unchanged.

Pattern of respiratory muscle activity during exercise tests in children born prematurely

2020 ◽  
Vol 24 (3) ◽  
pp. 78-83
Author(s):  
Josy Davidson ◽  
Sabrina Pinheiro Tsopanoglou ◽  
Victor Zuniga Dourado ◽  
Amélia Miyashiro Nunes dos Santos ◽  
Ana Lucia Goulart ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Respiratory Muscle ◽  
Exercise Tests ◽  
Respiratory Muscle Activity

Variations in respiratory muscle activity during echolocation when stationary in three species of bat (Microchiroptera: Vespertilionidae)

2001 ◽  
Vol 204 (24) ◽  
pp. 4185-4197
Author(s):  
Winston C. Lancaster ◽  
J. R. Speakman
Keyword(s):  
Muscle Activity ◽  
Respiratory Muscle ◽  
Respiratory Muscles ◽  
Transversus Abdominis ◽  
Abdominal Muscles ◽  
Pteronotus Parnellii ◽  
Economic Production ◽  
Morphological Adaptations ◽  
The Family ◽  
Respiratory Muscle Activity

SUMMARY Echolocating bats use respiratory muscles to power the production of biosonar vocalisations. The physical characteristics of these calls vary among species of bat, and variations also exist in the timing and patterns of respiratory muscle recruitment during echolocation. We recorded electromyograms from the respiratory muscles of three species of bat (Family Vespertilionidae) while the animals vocalised from stationary positions. Activity was recorded consistently from the lateral abdominal muscles (internal abdominal oblique and transversus abdominis) from all calling bats, but we found much variation within and among species. Bats in the family Vespertilionidae devoted longer periods of expiratory muscle activity to each call than did the mormoopid bat Pteronotus parnellii. These differences correlate negatively with the duration of calls. We suggest that morphological adaptations in some bats may facilitate the economic production of echolocation calls at rest.

Sequence of respiratory muscle activity during varied vocal attack

1965 ◽  
Vol 32 (2) ◽  
pp. 185-191 ◽  
Author(s):  
Michael S. Hoshiko ◽  
Kenneth W. Berger
Keyword(s):  
Muscle Activity ◽  
Respiratory Muscle ◽  
Respiratory Muscle Activity

scholarly journals Cervical spinal V2a neurons pattern respiratory muscle activity and enhance ventilation

2020 ◽  
Vol 34 (S1) ◽  
pp. 1-1
Author(s):  
Victoria N. Jensen ◽  
Azl Saeed ◽  
Kari A. Seedle ◽  
Sarah Marie Turner ◽  
Steven A. Crone
Keyword(s):  
Muscle Activity ◽  
Respiratory Muscle ◽  
Respiratory Muscle Activity

Respiratory Origin of Fluctuations in Arterial Blood Pressure in Premature Infants With Respiratory Distress Syndrome

PEDIATRICS ◽  
1988 ◽  
Vol 81 (3) ◽  
pp. 399-403
Author(s):  
Jeffrey Perlman ◽  
Bradley Thach
Keyword(s):  
Premature Infants ◽  
Muscle Activity ◽  
Intraventricular Hemorrhage ◽  
Respiratory Muscle ◽  
Pressure Fluctuations ◽  
Esophageal Pressure ◽  
Arterial Blood ◽  
Gastric Pressure ◽  
Pressure Changes ◽  
Respiratory Muscle Activity

A variable fluctuating pattern of arterial BP often precedes intraventricular hemorrhage in mechanically ventilated preterm infants. To learn more about the origin of this pattern, arterial BP and respiratory muscle activity were studied in five intubated premature infants who were at high risk for intraventricular hemorrhage. We monitored esophageal pressure, gastric pressure, and arterial BP. Consistent findings were: (1) arterial BP fluctuations have the same frequency and direction of change as esophageal and gastric pressure changes associated with spontaneous breathing (R ranged from .93 to .98, P &lt; .001); (2) spontaneous apneic pauses were accompanied by sudden and complete cessation of arterial BP fluctuations; (3) large "cough-like" fluctuations in esophageal and gastric pressures, seen in all infants, were associated with the largest fluctuations in arterial BP; (4) cutaneous stimulation had negligible effect on fluctuation in arterial BP provided no change in esophageal and gastric pressures occurred; (5) the effects of change in esophageal and gastric pressures on arterial BP were nearly simultaneous (0.05 to 0.25 second latency); (6) respirator pressure fluctuations had negligible effects on the fluctuations in arterial BP. These data suggest that the fluctuations in arterial BP are directly related to respiratory muscle activity and are most consistent with the familiar pulsus paradoxus that occurs in various other cardiorespiratory diseases.

Changes in respiratory muscle activity in ponies when end-expiratory lung volume is increased

1994 ◽  
Vol 76 (5) ◽  
pp. 2015-2025 ◽  
Author(s):  
B. K. Erickson ◽  
H. V. Forster ◽  
T. F. Lowry ◽  
L. G. Pan ◽  
M. J. Korducki ◽  
...  
Keyword(s):  
Tidal Volume ◽  
Lung Volume ◽  
Negative Pressure ◽  
Muscle Activity ◽  
Respiratory Muscle ◽  
Transversus Abdominis ◽  
Vagal Afferents ◽  
Breathing Frequency ◽  
Respiratory Muscle Activity

The objective of the present study was to determine whether lung and diaphragm afferents contribute to the changes in respiratory muscle activity when end-expiratory lung volume (EELV) is changed in ponies. We studied the responses of the diaphragm and the transversus abdominis (TA) muscles to passive increases in EELV in awake intact (I), diaphragm-deafferented (DD), pulmonary vagal- (hilar nerve) denervated (HND), and DD + HND ponies. Negative pressure of -10 or -20 cmH2O applied around the ponies′ torsos [positive transrespiratory (TR) pressure] increased (P < 0.05) EELV in all ponies; the increases were more (P < 0.05) in HND and less (P < 0.05) in DD than in I ponies. In I ponies, positive TR pressure increased (P < 0.05) the rate of rise of the integrated diaphragmatic electromyogram (EMG), reflecting increased drive to the muscle. This increase was less (P < 0.05) in DD and HND than in I ponies. In DD + HND ponies, there was no significant (P > 0.10) change in drive to the diaphragm during positive TR pressure. In I ponies, positive TR pressure increased (P < 0.05) the duration and mean activity of the TA EMG. In HND and DD + HND ponies, the TA EMG was not altered by positive TR pressure. I and DD ponies decreased (P < 0.05) breathing frequency but maintained tidal volume (VT) during positive TR pressure. HND and DD+HND ponies increased breathing frequency (P < 0.05) and decreased (P < 0.05) VT during positive TR pressure. We conclude that, during positive TR pressure when the diaphragm is presumably at a mechanical disadvantage, diaphragm and vagal afferents mediate increased drive to the diaphragm to prevent VT from decreasing. In addition, during positive TR pressure, vagal afferents mediate an increase in duration of TA activity, which minimizes the increase in EELV.

Effects of Inspiratory Load on Chest Wall Kinematics, Breathing Pattern, and Respiratory Muscle Activity of Mouth-Breathing Children

2020 ◽  
Vol 65 (9) ◽  
pp. 1285-1294
Author(s):  
Jéssica Danielle Medeiros da Fonsêca ◽  
Vanessa Regiane Resqueti ◽  
Kadja Benício ◽  
Valéria Soraya de Farias Sales ◽  
Luciana Fontes Silva da Cunha Lima ◽  
...  
Keyword(s):  
Chest Wall ◽  
Muscle Activity ◽  
Respiratory Muscle ◽  
Breathing Pattern ◽  
Mouth Breathing ◽  
Chest Wall Kinematics ◽  
Respiratory Muscle Activity ◽  
Inspiratory Load
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