Spinal decision making for respiratory muscle recruitment?

Fuller, David D.

doi:10.1113/jp275225

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…The longer latency activations are consistent with prior reports indicating that ISMS preferentially activates spinal motoneurons via polysynaptic interneuronal pathways (Gustafsson and Jankowska, 1976; Jankowska and Roberts, 1972). While we did not directly measure synaptic connectivity in the spinal cord, we feel this analysis is informative, particularly in light of the rapidly increasing interest in spinal interneurons and activation of respiratory motoneurons (Cregg et al, 2017; Fuller, 2017; Hudson et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Intraspinal microstimulation for respiratory muscle activation

Sunshine

Ganji

Reier

et al. 2018

Experimental Neurology

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A complex propriospinal network is synaptically coupled to phrenic and intercostal motoneurons, and this makes it difficult to predict how gray matter intraspinal microstimulation (ISMS) will recruit respiratory motor units. We therefore mapped the cervical and high thoracic gray matter at locations which ISMS activates diaphragm (DIA) and external intercostal (EIC) motor units. Respiratory muscle electromyography (EMG) was recorded in anesthetized female spinally intact adult rats while a stimulating electrode was advanced ventrally into the spinal cord in 600μm increments. At each depth, single biphasic stimuli were delivered at 10-90μA during both the inspiratory and expiratory phase independently. Twenty electrode tracks were made from C2-T1 at medial and lateral gray matter locations. During inspiration, ISMS evoked DIA and EIC activity throughout C2-T1 gray matter locations, with mutual activation occurring at 17±9% of sites. During inspiratory phase ISMS the average latency for DIA activation was 4.40±0.70ms. During the expiratory phase, ISMS-induced DIA activation required electrodes to be in close proximity to the phrenic motoneuron pool, and average activation latency was 3.30±0.50ms. We conclude that appropriately targeted ISMS can co-activate DIA and EIC motor units, and endogenous respiratory drive has a powerful impact on ISMS-induced respiratory motor unit activation. The long latency diaphragm motor unit activation suggests the presence of a complex propriospinal network that can modulate phrenic motor output.

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Section: Discussionmentioning

confidence: 99%

Intraspinal microstimulation for respiratory muscle activation

Sunshine

Ganji

Reier

et al. 2018

Experimental Neurology

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“…In response to that, the central nervous system was able to enable selective taskdependent recruitment, and these will call upon the most mechanically advantageous muscles to be primarily recruited. 22 Other than mechanical advantage, it was also shown that higher neural drive allows the recruitment of muscles with minimal metabolic cost of ventilation, and thus is the origin of local recruitment theory in the spinal network. 23 Hence it could be drawn out that recruitment pattern of these intercostals vary towards the mechanical motion it is meant to perform.…”

Section: Involved In Respirationmentioning

confidence: 99%

“…23 Hence it could be drawn out that recruitment pattern of these intercostals vary towards the mechanical motion it is meant to perform. 22 Several reviews had attempted to show how surface electromyography (sEMG) could be utilized to show muscle activity in the intercostals area. [24][25][26] These sEMG findings revealed that intercostals generally becomes more active when breathing against resistance.…”

Section: Involved In Respirationmentioning

confidence: 99%

Biomechanical Impacts of Forward Head Posture on the Respiratory Function

Triangto¹,

Widjanantie²,

Nusdwinuringtyas³

2020

IndoJPMR

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Introduction: Forward head posture (FHP) is a very common problem among the working population. Being one of the most subconscious function in humans, respiratory function utilizes both the diaphragmand external intercostal muscles for quiet breathing. However during labored breathing, many other muscles will be recruited, and mostly these muscles have attachments in the cervical, thoracic ribcage,and even lumbar vertebrae. By the nature of attachments of these muscles on the cervical vertebra and thoracic cage, it is then plausible that FHP would affect the respiratory function. Methods: Thorough searches were done through international journals for the last ten years regarding the topic of FHP and its impacts to the respiratory biomechanics. Discussion: Previous studies have reported how prolonged FHP will result in kyphotic posture, reducing the mobility of ribcage, and modifies all respiratory muscular attachments such as sternocleidomastoids, intercostals, and to a certain extent, the diaphragm. All these result in a restrictive lung disorder, signified by reducing spirometry values, such as Forced Vital Capacity, Sniff Nasal Inspiratory Pressure, and Peak Flow Rate. Conclusion: Forward head posture disturb the respiratory biomechanics.

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Spinal decision making for respiratory muscle recruitment?

Cited by 2 publications

References 7 publications

Intraspinal microstimulation for respiratory muscle activation

Intraspinal microstimulation for respiratory muscle activation

Biomechanical Impacts of Forward Head Posture on the Respiratory Function

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