Attenuation of the evoked responses with repeated exposure to proprioceptive disturbances is muscle specific

Caudron, Sébastien; Langlois, Lucas; Nougier, Vincent; Guerraz, Michel

doi:10.1016/j.gaitpost.2010.04.003

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…This could lead to a bias in outcome due to adaptation of muscles to vibration (Caudron et al 2010). However, where this effect was found over a time interval of 10-20 s, we took at least 5 min between two trials on the same muscle.…”

Section: Discussionmentioning

confidence: 99%

Ankle proprioception is not targeted by exercises on an unstable surface

et al. 2011

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Laboratory study using a repeated measures design. The aim of this study was to determine if ankle proprioception is targeted in exercises on unstable surfaces. Lateral ankle sprain (LAS) has recurrence rates over 70%, which are believed to be due to a reduced accuracy of proprioceptive signals from the ankle. Proprioceptive exercises in rehabilitation of LAS mostly consist of balancing activities on an unstable surface. The methods include 100 healthy adults stood barefoot on a solid surface and a foam pad over a force plate, with occluded vision.Mechanical vibration was used to stimulate proprioceptive output of muscle spindles of triceps surae and lumbar paraspinal musculature. Each trial lasted for 60 s; vibration was applied from the 15th till the 30th second. Changes in mean velocity and mean position of the center of pressure (CoP) as a result of muscle vibration were calculated. Results show that on foam, the effect of triceps surae vibration on mean CoP velocity was significantly smaller than on a solid surface, while for paraspinal musculature vibration the effect was bigger on foam than on solid surface. Similar effects were seen for mean CoP displacement as outcome. Exercises on unstable surfaces appear not to target peripheral ankle proprioception. Exercises on an unstable surface may challenge the capacity of the central nervous system to shift the weighting of sources of proprioceptive signals on balance.

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Section: Discussionmentioning

confidence: 99%

Ankle proprioception is not targeted by exercises on an unstable surface

et al. 2011

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“…Any changes in muscle length, more so when rapid, activate, in fact, the large spindle afferent fibres, highly sensitive to the velocity of muscle stretch rather than the slow muscle changes in length as when standing on a Solid support (118,119). And the spindle input is certainly funnelled to the appropriate motor pools (120)(121)(122)(123) and supra spinal centres (124,125). In this light, a larger RQ on Foam compared to Solid support would be expression of the role played by vision in modulating the central integration of vestibular and somatosensory information (126,127) rather than of the mere advantage connected with the presence of an external (visual) reference (128) 54) also showed that the oscillation frequency increases with EC compared to EO when subjects stand on Foam.…”

Section: Proprioception and Vision On Firm And Compliant Supportmentioning

confidence: 99%

Incongruity of Geometric and Spectral Markers in the Assessment of Body Sway

Sozzi

Ghai²,

Schieppati

2022

Front. Neurol.

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Different measurements of body oscillations in the time or frequency domain are being employed as markers of gait and balance abnormalities. This study investigates basic relationships within and between geometric and spectral measures in a population of young adult subjects. Twenty healthy subjects stood with parallel feet on a force platform with and without a foam pad. Adaptation effects to prolonged stance were assessed by comparing the first and last of a series of eight successive trials. Centre of Foot Pressure (CoP) excursions were recorded with Eyes Closed (EC) and Open (EO) for 90s. Geometric measures (Sway Area, Path Length), standard deviation (SD) of the excursions, and spectral measure (mean power Spectrum Level and Median Frequency), along the medio-lateral (ML) and antero-posterior (AP) direction were computed. Sway Area was more strongly associated than Path Length with CoP SD and, consequently, with mean Spectrum Level for both ML and AP, and both visual and surface conditions. The squared-SD directly specified the mean power Spectrum Level of CoP excursions (ML and AP) in all conditions. Median Frequency was hardly related to Spectrum Level. Adaptation had a confounding effect, whereby equal values of Sway Area, Path Length, and Spectrum Level corresponded to different Median Frequency values. Mean Spectrum Level and SDs of the time series of CoP ML and AP excursions convey the same meaning and bear an acceptable correspondence with Sway Area values. Shifts in Median Frequency values represent important indications of neuromuscular control of stance and of the effects of vision, support conditions, and adaptation. The Romberg Quotient EC/EO for a given variable is contingent on the compliance of the base of support and adaptation, and different between Sway Area and Path Length, but similar between Sway Area and Spectrum Level (AP and ML). These measures must be taken with caution in clinical studies, and considered together in order to get a reliable indication of overall body sway, of modifications by sensory and standing condition, and of changes with ageing, medical conditions and rehabilitation treatment. However, distinct measures shed light on the discrete mechanisms and complex processes underpinning the maintenance of stance.

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“…Of specific interest has been the potential sensory contribution of the primary dorsiflexor, the tibialis anterior (TA) muscle. This muscle is known to play a role in maintaining upright stance, highlighted by detrimental localized effects of vibration (3,28,34,35) and fatigue (1, 10) on balance control. Despite providing some degree of ankle torque when balance is challenged (17,35), during normal quiet standing the TA remains relatively quiet and unmodulated in activity throughout the sway cycle (6,31).…”

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confidence: 99%

Tibialis anterior muscle fascicle dynamics adequately represent postural sway during standing balance

Day

Lichtwark

Cresswell

2013

Journal of Applied Physiology

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To maintain a stable, upright posture, the central nervous system (CNS) must integrate sensory information from multiple sources and subsequently generate corrective torque about the ankle joint. Although proprioceptive information from the muscles that cross this joint has been shown to be vital in this process, the specific source of this information remains questionable. Recent research has been focused on the potential role of tibialis anterior (TA) muscle during standing, largely due to the lack of modulation of its activity throughout the sway cycle. Ten young, healthy subjects were asked to stand normally under varying conditions, for periods of 60 s. During these trials, intramuscular electromyographic (EMG) activity and the fascicle length of three distinct anatomical regions of TA were sampled synchronously with kinematic data regarding sway position. In the quiet standing conditions, TA muscle activity was unmodulated and fascicle length changes in each region were tightly coupled with changes in sway position. In the active sway condition, more EMG activity was observed in TA and the fascicle length changes were decoupled from sway position. No regional specific differences in correlation values were observed, contrasting previous observations. The ability of the fascicles to follow sway position builds upon the suggestion that TA is well placed to provide accurate, straightforward sensory information to the CNS. As previously suggested, through reciprocal inhibition, afferent information from TA could help to regulate plantar flexor torque at relevant phases of the sway cycle. The proprioceptive role of TA appears to become complicated during more challenging conditions.

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Attenuation of the evoked responses with repeated exposure to proprioceptive disturbances is muscle specific

Cited by 8 publications

References 32 publications

Ankle proprioception is not targeted by exercises on an unstable surface

Ankle proprioception is not targeted by exercises on an unstable surface

Incongruity of Geometric and Spectral Markers in the Assessment of Body Sway

Tibialis anterior muscle fascicle dynamics adequately represent postural sway during standing balance

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