The influence of startReact on long-latency reflexive muscle activation during the transition from posture to movement
| Autor: | Vengateswaran J. Ravichandran, Eric J. Perreault, Claire F. Honeycutt |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0303 health sciences
medicine.medical_specialty Movement (music) Transition (fiction) Muscle activation Motor Pathways Long latency 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation medicine.anatomical_structure Time windows medicine Stretch reflex Psychology 030217 neurology & neurosurgery Simulation 030304 developmental biology |
| DOI: | 10.1101/180554 |
| Popis: | Many motor tasks involve transitions from posture to movement such as shifting from holding an object to setting it on a surface. Although many movements are voluntary processes, they are facilitated through motor pathways that span the continuum between reflexive and voluntary control. The mechanisms driving the long-latency stretch reflex (LLSR) have remained hotly contested. Recently, startReact has been shown to influence the fast muscular response to perturbations (Ravichandran et. al. 2013). The objective of this study was to evaluate how the LLSR and startReact impact the muscular response during the transition from posture to movement. We hypothesized that both the LLSR and startReact would be involved throughout the transition from posture to movement; however there would be a clear transition from LLSR dominance during posture to startReact dominance near/during movement. We tested this hypothesis using perturbations of elbow posture at various times before a fast ballistic extension movement. We found clear evidence that both the LLSR and startReact components were influenced changes in the late long-latency time window. The results provide insights on how the nervous system regulates involuntary responses to perturbations during the transition from maintenance of arm posture to movement.New and NoteworthyWe recently demonstrated that the startReact effect, the startled release of a planned movement, can influence the muscular response during the LLSR. Here we observe how the influence of startReact can change from the transition from posture (no/little influence) to movement (strong influence). While not all paradigms trigger a startReact effect, this work demonstrates that when present startRect can have a profound effect on the overall muscle activity - even obscuring the traditional LLSR response. |
| Databáze: | OpenAIRE |
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