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Article Abstract
Recent evidence suggests that surface electromyography of the parasternal intercostals (EMGpara) can be a non-invasive alternative to diaphragmatic EMG (EMGdi) for estimating neural respiratory drive (NRD) during cardiopulmonary exercise testing (CPET). The purpose of this study was to determine if non-respiratory muscles influence EMGpara by having subjects place their hands on (H) and off (H) the handlebars during cycling-based CPET. Ten healthy adults performed an incremental cycling test until volitional exhaustion. Participants were instrumented with an esophageal electrode catheter to measure EMGdi, and surface electrodes on the 2nd intercostal space to measure EMGpara. Subjects alternated between 30s of H and 30s H during each exercise stage. There were no differences in EMGdi across all exercise intensities. However, EMGpara was significantly greater during the H vs. H condition at all exercise intensities (p<0.05). These results suggest that EMGpara may not be an appropriate surrogate of NRD during cycle exercise testing due to co-activation of adjacent skeletal muscles.
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Faculdade de Ciências da Saúde do Trairi (FACISA), Programa de Pós-Graduação em Ciências da Reabilitação, Santa Cruz, Rio Grande do Norte, Brazil.
Neural respiratory drive (NRD) is measured using a non-invasive recording of respiratory electromyographic signal. The parasternal intercostal muscle can assess the imbalance between the load and capacity of respiratory muscles and presents a similar pattern to diaphragmatic activity. We aimed to analyze the neural respiratory drive in seventeen individuals with hypertension during quite breathing and maximal voluntary ventilation (MVV) (103.
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Centre for Human & Applied Physiological Sciences, School of Basic & Medical Biosciences, King's College London, London, United Kingdom. Equal contribution to the study.
Objective: Parasternal intercostal muscle electromyography (EMGpara) has been used as an index of respiratory load in health and disease. While reference values are available, such data have been obtained with subjects in the seated position only. The objective of the current study was to determine the influence of posture on measurements of EMGpara.
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Respir Physiol Neurobiol
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Centre for Heart Lung Innovation, University of British Columbia and St. Paul's Hospital, Vancouver, BC, Canada; Department of Physical Therapy, University of British Columbia, Vancouver, BC, Canada. Electronic address:
Recent evidence suggests that surface electromyography of the parasternal intercostals (EMGpara) can be a non-invasive alternative to diaphragmatic EMG (EMGdi) for estimating neural respiratory drive (NRD) during cardiopulmonary exercise testing (CPET). The purpose of this study was to determine if non-respiratory muscles influence EMGpara by having subjects place their hands on (H) and off (H) the handlebars during cycling-based CPET. Ten healthy adults performed an incremental cycling test until volitional exhaustion.
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Division of Asthma, Allergy and Lung Biology, King's College London, London, UK.
Neural respiratory drive, quantified by the parasternal intercostal muscle electromyogram (EMGpara), provides a sensitive measure of respiratory system load-capacity balance. Reference values for EMGpara-based measures are lacking and the influence of individual anthropometric characteristics is not known. EMGpara is conventionally expressed as a percentage of that obtained during a maximal inspiratory effort (EMGpara%max), leading to difficulty in applying the technique in subjects unable to reliably perform such manoeuvres.
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