EMG Analysis of Human Inspiratory Muscle Resistance to Fatigue During Exercise

Segizbaeva, M. O.; Donina, Zh. A.; Timofeev, N. N.; Korolyov, Yu. N.; Golubev, V. N.; Aleksandrova, N. P.

doi:10.1007/978-94-007-6627-3_29

Cited by 27 publications

(15 citation statements)

References 23 publications

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“…A decrease in the centroid frequency varied from 5 % to 35 % depending on the muscle; being smaller in case of the diaphragm and chest inspiratory muscles, which points a greater resistance of these muscles to exercise-induced fatigue compared with the accessory muscles of the neck. These data are in line with the majority of other studies (Segizbaeva and Aleksandrova 2014;Janssens et al 2013;Segizbaeva et al 2013).…”

Section: Discussionmentioning

confidence: 60%

Effect of Simulated Microgravity and Lunar Gravity on Human Inspiratory Muscle Function: ‘Selena-T’ 2015 Study

Segizbaeva

Aleksandrova

Donina

et al. 2016

Pulmonary Dysfunction and Disease

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As a part of the multi-disciplinary "SELENA-T"-2015 Bed Rest Study, we investigated the pattern of inspiratory muscles fatigue in 22 healthy male subjects during incremental exercise test to exhaustion before and after 21 days of hypokinesia evoked by bed rest. Hypokinesia consisted of head-down bed rest (HDBR) at a minus 6° angle, simulating microgravity present on orbiting spacecraft, in 10 subjects. The remaining 12 subjects spent the first 5 days of hypokinesia in HDBR position and the subsequent 16 days in head-up bed rest (HUBR) at a plus 9.6° angle, as a presumed analog of lunar gravity that is six times less than Earth's gravity. Maximal inspiratory pressure (MIP) and electromyograms (EMG) of the diaphragm (D), parasternal (PS), sternocleidomastoid (SCM), and scalene (S) muscles served as indices of inspiratory muscle function. Before both HDBR and HUBR, exercise decreased MIP and centroid frequency (fc) of EMG (D, PS, SCM, and S) power spectrum (p < 0.05). After 3 weeks of HDBR, but not HUBR, inspiratory muscles fatigue was more expressed compared with control (p < 0.05). We conclude that HDBR lowers inspiratory muscles resistance to fatigue during high-intensity exercise while HUBR has no such effect. These changes may limit maximal ventilation and may contribute to exercise intolerance observed after prolonged simulated microgravity. The physiological mechanisms of respiratory muscle dysfunction after HDBR consist primarily of postural effects, and are not due only to hypokinesia.

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Section: Discussionmentioning

confidence: 60%

Effect of Simulated Microgravity and Lunar Gravity on Human Inspiratory Muscle Function: ‘Selena-T’ 2015 Study

Segizbaeva

Aleksandrova

Donina

et al. 2016

Pulmonary Dysfunction and Disease

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“…The major finding of this study was the graphical identification of EMG IP in inspiratory muscles. We believe that this is the first study to identify EMG IP in the scalene and sternocleidomastoid muscles using SEMG under the condition of progressive inspiratory flow velocity produced by increasing the respiratory rate and shortening the inspiratory time using a mask ventilator (2,17,24,29,31,33,36). In addition, the existence of EMG IP infers the existence of EMG AT in inspiratory muscles.…”

Section: Discussionmentioning

confidence: 73%

“…Regarding previous studies of respiratory muscles related to increasing neuromuscular activation against increases in resistive loading, animal experiments found that MUs of respiratory muscles such as fast fibers are recruited in response to tachypnea with an increase in the inspiratory flow (7,8). Meanwhile, there are few studies in humans reporting the existence of respiratory muscle EMG AT (2,17,24,29,33,36).…”

Section: Introductionmentioning

confidence: 99%

Surface electromyographic evaluation of the neuromuscular activation of the inspiratory muscles during progressively increased inspiratory flow under inspiratory-resistive loading

et al. 2018

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This study aimed to evaluate neuromuscular activation in the scalene and sternocleidomastoid muscles using surface electromyography (EMG) during progressively increased inspiratory flow, produced by increasing the respiratory rate under inspiratory-resistive loading using a mask ventilator. Moreover, we attempted to identify the EMG inflection point (EMG) on the graph, at which the root mean square (RMS) of the EMG signal values of the inspiratory muscles against the inspiratory flow velocity acceleration abruptly increases, similarly to the EMG anaerobic threshold (EMG) reported during incremental-resistive loading in other skeletal muscles. We measured neuromuscular activation of healthy male subjects and found that the inspiratory flow velocity increased by approximately 1.6-fold. We successfully observed an increase in RMS that corresponded to inspiratory flow acceleration with ρ ≥ 0.7 (Spearman's rank correlation) in 17 of 27 subjects who completed the experimental protocol. To identify EMG, we analyzed the fitting to either a straight or non-straight line related to the increasing inspiratory flow and RMS using piecewise linear spline functions. As a result, EMG was identified in the scalene and sternocleidomastoid muscles of 17 subjects. We believe that the identification of EMG in this study infers the existence of EMG in inspiratory muscles. Application of surface EMG, followed by identification of EMG, for evaluating the neuromuscular activation of respiratory muscles may be allowed to estimate the signs of the respiratory failure, including labored respiration, objectively and non-invasively accompanied using accessory muscles in clinical respiratory care.

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“…Similar to the intercostal muscles, this indicates that uncontrolled asthma causes the accessory breathing muscles to be recruited. Sternocleidomastoid activity during exhaustive exercise has been assessed by Segizbaeva in 2013 in healthy adult men [94]. Activity of the sternocleidomastoid muscles increased in all subjects of Segizbaeva's study, possibly explaining the increase in reliably measurable patients in both groups.…”

Section: Comparison Of Emg Parameters At Largest Bronchoconstrictionmentioning

confidence: 99%

Assessment of Asthma in Children Using Electromyography

Keijzer

2019

D30. Asthma: What’s New in Assessment and Treatment?

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Rationale Asthma is one of the most common chronic diseases in childhood, occurring in up to 10% of all children. Exercise induced bronchoconstriction (EIB) is indicative of uncontrolled asthma and can be assessed by means of an exercise challenge test (ECT). These tests however draw heavily on healthcare resources and require demanding repetitive forced breathing manoeuvres of children. In this study the electric activity of the respiratory muscles was measured as a tool to assess EIB. Methods Children suspected of exercise induced respiratory symptoms performed an ECT wearing a portable EMG amplifier (Dipha-16, Demcon Macawi respiratory systems, Enschede, the Netherlands). EIB was defined as a fall in FEV1 of greater than 13%. Electrodes were placed bilaterally at the diaphragm and accessory breathing (intercostal-, sternocleidomastoid-and trapezoid) muscles. A single reference electrode was placed at the sternum. Children were asked to sit still for 30 seconds after each spirometry measurement to obtain EMG measurements. Data was pre-processed and analyzed in Matlab.

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EMG Analysis of Human Inspiratory Muscle Resistance to Fatigue During Exercise

Cited by 27 publications

References 23 publications

Effect of Simulated Microgravity and Lunar Gravity on Human Inspiratory Muscle Function: ‘Selena-T’ 2015 Study

Effect of Simulated Microgravity and Lunar Gravity on Human Inspiratory Muscle Function: ‘Selena-T’ 2015 Study

Surface electromyographic evaluation of the neuromuscular activation of the inspiratory muscles during progressively increased inspiratory flow under inspiratory-resistive loading

Assessment of Asthma in Children Using Electromyography

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