Combination of jaw and tongue movement training influences neuroplasticity of corticomotor pathways in humans

Iida, Takashi; Komoda, Yoshihiro; Kothari, Mohit; Sekihata, Satoshi; Komiyama, Osamu; Sessle, Barry J.; Svensson, Peter

doi:10.1007/s00221-019-05610-2

Cited by 6 publications

(7 citation statements)

References 42 publications

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“…However, unlike the oMI neuroplasticity demonstrated within just 1 hour of tongue‐task training, 1 hour of the bite‐task training did not produce evidence of neuroplasticity in the masseter muscle representation in oMI; it was considered that the bite‐task training may have been inadequate to induce or allow for detection of excitability changes in oMI. Indeed, a more complex biting task did induce evidence in humans of neuroplasticity in the masseter representation in oMI, especially if combined with a tongue task …”

Section: Regulation Of Oro‐facial Sensorimotor Functionsmentioning

confidence: 99%

“…Indeed, a more complex biting task did induce evidence in humans of neuroplasticity in the masseter representation in oMI, especially if combined with a tongue task. 78,79 It has been suggested that the neuroplastic changes accompanying the kinematic (ie, physical movement) changes as a result of training may be diverse and dependent on several factors such as the specific parameters of the task or muscles being trained. 34,74 Yet, other factors could be the age of the individual being trained (see below) and the presence or not of pain.…”

Section: Transcranial Magnetic Stimulation (Tms) and Fmri Studies In mentioning

confidence: 99%

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Can you be too old for oral implants? An update on ageing and plasticity in the oro‐facial sensorimotor system

Sessle

2019

J of Oral Rehabilitation

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This review focuses on the capacity of the brain for plasticity and the utility and efficacy of oral implants in helping to restore oro‐facial sensorimotor functions, especially in elderly patients. The review first outlines the components of the oro‐facial sensorimotor system which encompasses both oro‐facial tissues and a number of brain regions. One such region is the sensorimotor cortex that controls the activity of the numerous oro‐facial skeletal muscles. These muscles are involved in a number of functions including reflexes and the more complex sensorimotor functions of mastication, swallowing and speech. The review outlines the use by the brain of sensory inputs from oro‐facial receptors in order to provide for exquisite sensorimotor control of the activity of the oro‐facial muscles. It highlights the role in this sensorimotor control played by periodontal mechanoreceptors and their sensory inputs to the brain, and how oral implants in concert with the plastic capacity of the brain may, at least in part, compensate for reduced sensorimotor functioning when teeth are lost. It outlines findings of ageing‐related decrements in oro‐facial sensorimotor functions and control. The changes in oro‐facial tissues and the brain that underlie these ageing‐related functional alterations are also considered, along with adaptive and compensatory processes that utilise the brain's capacity for plasticity. The review also notes the evidence that rehabilitation that incorporates adjunctive approaches such as sensorimotor training paradigms in addition to oral prostheses such as implants may enhance these processes and help maintain or facilitate recovery of sensorimotor functioning in the elderly.

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Section: Regulation Of Oro‐facial Sensorimotor Functionsmentioning

confidence: 99%

Section: Transcranial Magnetic Stimulation (Tms) and Fmri Studies In mentioning

confidence: 99%

Can you be too old for oral implants? An update on ageing and plasticity in the oro‐facial sensorimotor system

Sessle

2019

J of Oral Rehabilitation

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“…17,20 In brief, the EMG activity was recorded from the right side of the tongue dorsum, the masseter muscle, and the first dorsal interosseous muscles (FDI). 27 To evoke MEPs in the masseter, the participants were instructed to kept a calibration device to be placed and bit between incisors during the measurement to calibrate bite force to approximately 10 N. 16,20,28 In regard to EMG recording, the bandpass was filtered at 10 Hz-5 kHz, and stored on a Viking software (Viasys Healthcare, Madison, WI). To perform TMS, a Magstim 200 stimulator (Magstim Company Limited, Dyfed, UK) and a focal figure 8 stimulating coil were set up.…”

Section: Recording Of Motor-evoked Potentials By Transcranial Magneti...mentioning

confidence: 99%

“…A recent study suggested that repeated jaw or tongue training tasks could trigger corticomotor excitability changes in jaw and tongue muscles. 11,16 Most of the studies on the corticomotor representation of the orofacial region (eg, tongue and masseter muscles) have shown the effect of an active motor task such as jaw protrusion, tongue lift movement, and tooth-clenching task. 11,[17][18][19][20] In contrast, wearing a MAD during sleep could be considered a passive static jaw motor task.…”

Section: Introductionmentioning

confidence: 99%

Effect of mandibular advancement device on plasticity in corticomotor control of tongue and jaw muscles

Matsuzaki

Shimada

Tanaka

et al. 2021

Journal of Clinical Sleep Medicine

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Study Objectives: This study aims to investigate whether the use of a mandibular advancement device (MAD) is associated with neuroplasticity in corticomotor control of tongue and jaw muscles. Methods: Eighteen healthy individuals participated in a randomized crossover study with 3 conditions for 2 weeks each: baseline, wearing an oral appliance (sham MAD), or MAD during sleep. The custom-made MAD was constructed by positioning the mandible to 50% of its maximal protrusion limit. Transcranial magnetic stimulation was applied to elicit motor-evoked potentials (MEPs). The MEPs were assessed by constructing stimulus-response curves at 4 stimulus intensities: 90%, 100%, 120%,and 160% of the motorthreshold from theright tongue andright masseter and thefirst dorsal interosseous muscles (control) at baseline, afterthe first and the second intervention. Results: There was a significant effect of condition and stimulus intensity both on the tongue and on masseter MEPs (P < .01). Tongue and masseter MEPs were significantly higher at 120% and 160% after the MAD compared with the oral appliance (P < .05). There were no effects of condition on first dorsal interosseous muscle MEPs (P = .855). Conclusions: The finding suggests that MAD induces neuroplasticity in the corticomotor pathway of the tongue and jaw muscles associated with the new jaw position. Further investigations are required in patients with obstructive sleep apnea to see whether this cortical neuroplasticity may contribute or perhaps predict treatment effects with MADs in obstructive sleep apnea.

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“…This pathway may be one mechanism by which motor activity can reinforce learning. Although evidence for increases in oromotor cortical excitability has been established by a number of previous studies (Iida et al 2019 ; Komoda et al 2015 ; Kothari et al 2013 ; Svensson et al 2006 ), it is unclear how these neurophysiologic changes facilitate improved functional outcomes , such as speaking or eating, that are important for everyday life (Kothari et al 2013 ; Zhang et al 2016 ). Authors in the dysphagia literature have highlighted the need for functional outcomes to be included in these types of studies (Macrae and Humbert 2013 ).…”

Section: Introductionmentioning

confidence: 99%

The effects of continuous oromotor activity on speech motor learning: speech biomechanics and neurophysiologic correlates

et al. 2021

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Sustained limb motor activity has been used as a therapeutic tool for improving rehabilitation outcomes and is thought to be mediated by neuroplastic changes associated with activity-induced cortical excitability. Although prior research has reported enhancing effects of continuous chewing and swallowing activity on learning, the potential beneficial effects of sustained oromotor activity on speech improvements is not well-documented. This exploratory study was designed to examine the effects of continuous oromotor activity on subsequent speech learning. Twenty neurologically healthy young adults engaged in periods of continuous chewing and speech after which they completed a novel speech motor learning task. The motor learning task was designed to elicit improvements in accuracy and efficiency of speech performance across repetitions of eight-syllable nonwords. In addition, transcranial magnetic stimulation was used to measure the cortical silent period (cSP) of the lip motor cortex before and after the periods of continuous oromotor behaviors. All repetitions of the nonword task were recorded acoustically and kinematically using a three-dimensional motion capture system. Productions were analyzed for accuracy and duration, as well as lip movement distance and speed. A control condition estimated baseline improvement rates in speech performance. Results revealed improved speech performance following 10 min of chewing. In contrast, speech performance following 10 min of continuous speech was degraded. There was no change in the cSP as a result of either oromotor activity. The clinical implications of these findings are discussed in the context of speech rehabilitation and neuromodulation.

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Combination of jaw and tongue movement training influences neuroplasticity of corticomotor pathways in humans

Cited by 6 publications

References 42 publications

Can you be too old for oral implants? An update on ageing and plasticity in the oro‐facial sensorimotor system

Can you be too old for oral implants? An update on ageing and plasticity in the oro‐facial sensorimotor system

Effect of mandibular advancement device on plasticity in corticomotor control of tongue and jaw muscles

The effects of continuous oromotor activity on speech motor learning: speech biomechanics and neurophysiologic correlates

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