Is the EMGs Amplitude Distribution Spatially Localized in the Pectoralis Major Muscle During the Inclined Bench Press?

Mancebo, Felipe D.; Cabral, Hélio V.; Souza, Leonardo Mendes Leal de; Oliveira, Líliam Fernandes de

doi:10.1007/978-981-13-2517-5_46

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The pectoralis major muscle has multiple zones of innervations that are confined medially within the cranio-caudal muscle length (45). This subserves discrete recruitment of different muscle portions to accomplish the required movement depending on the posture and the upper limb osteo-kinematics (46)(47)(48). Critically, the compatibility between express muscle responses and cued reaching directions suggests that the cue-induced modulations of express muscle responses were inclusive of prior cue-driven motor signals, rather than solely sensitive to facilitation of rapid visuospatial target processing.…”

Section: Cue-driven Motor Facilitationmentioning

confidence: 99%

Cue-driven motor planning facilitates express visuomotor responses in human arm muscles

Contemori

Loeb

Wallis

et al. 2022

Preprint

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Humans can produce “express” (∼100ms) arm muscle responses that are inflexibly locked in time and space to the presentation of a visual target, consistent with subcortical visuomotor transformations via the tecto-reticulo-spinal pathway. These express visuomotor responses are sensitive to explicit cue-driven expectations, but it is unclear at what stage of sensory-to-motor transformation such modulation occurs. Here, we recorded electromyographic activity from shoulder muscles as participants reached toward one of four virtual targets whose physical location was partially predictable from a symbolic cue. In an experiment in which targets could be veridically reached, express responses were inclusive of the biomechanical requirements for reaching the cued locations and not systematically modulated by cue validity. In a second experiment, movements were restricted to the horizontal plane so that the participants could perform only rightward or leftward reaches, irrespective of target position on the vertical axis. Express muscle responses were almost identical for targets that were validly cued in the horizontal direction, regardless of cue validity in the vertical dimension. Together, these findings suggest that the cue-induced enhancements of express responses are dominated by effects at the level of motor plans and not solely via facilitation of early visuospatial target processing. Notably, direct cortico-tectal and cortico-reticular projections exist that are well-placed to modulate pre-stimulus motor preparation state in subcortical circuits. Our results appear to reflect a neural mechanism by which contextually relevant motor plans can be stored within subcortical visuomotor nodes and rapidly released in response to compatible visual inputs.NEW & NOTEWORTHYExpress arm muscle responses to suddenly appearing visual targets for reaching rapid have been attributed to the tecto-reticulo-spinal pathway in humans. We demonstrate that symbolic cues before target presentation can modulate such express arm muscle responses compatibly with the biomechanics of the cued reaching direction and the cue validity. This implies cortically mediated modulation of one or more sensorimotor transformation nodes of the subcortical express pathway.

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Section: Cue-driven Motor Facilitationmentioning

confidence: 99%

Cue-driven motor planning facilitates express visuomotor responses in human arm muscles

Contemori

Loeb

Wallis

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Symbolic cues enhance express visuomotor responses in human arm muscles at the motor planning rather than the visuospatial processing stage

Contemori

Loeb

Wallis

et al. 2022

Journal of Neurophysiology

View full text Add to dashboard Cite

Humans can produce "express" (~100ms) arm muscle responses that are inflexibly locked in time and space to visual target presentations, consistent with subcortical visuomotor transformations via the tecto-reticulo-spinal pathway. These express visuomotor responses are sensitive to explicit cue-driven expectations, but it is unclear at what stage of sensory-to-motor transformation such modulation occurs. Here, we recorded electromyographic activity from shoulder muscles as participants reached toward one of four virtual targets whose physical location was partially predictable from a symbolic cue. In an experiment in which targets could be veridically reached, express responses were inclusive of the biomechanical requirements for reaching the cued locations and not systematically modulated by cue validity. In a second experiment, movements were restricted to the horizontal plane so that the participants could perform only rightward or leftward reaches, irrespective of target position on the vertical axis. Express muscle responses were almost identical for targets that were validly cued in the horizontal direction, regardless of cue validity in the vertical dimension. Together, these findings suggest that the cue-induced enhancements of express responses are dominated by effects at the level of motor plans and not solely via facilitation of early visuospatial target processing. Notably, direct cortico-tectal and cortico-reticular projections exist that are well-placed to modulate pre-stimulus motor preparation state in subcortical circuits. Our results could reflect a neural mechanism by which contextually relevant motor responses to compatible visual inputs are rapidly released via subcortical circuits that are sufficiently along the sensory- to-motor continuum.

show abstract

Is the EMGs Amplitude Distribution Spatially Localized in the Pectoralis Major Muscle During the Inclined Bench Press?

Cited by 2 publications

References 17 publications

Cue-driven motor planning facilitates express visuomotor responses in human arm muscles

Cue-driven motor planning facilitates express visuomotor responses in human arm muscles

Symbolic cues enhance express visuomotor responses in human arm muscles at the motor planning rather than the visuospatial processing stage

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