Excitability of spinal neural function by motor imagery with isometric opponens pollicis activity: Influence of vision during motor imagery

Suzuki, Toshiaki; Bunno, Yoshibumi; Onigata, Chieko; Tani, Makiko; Uragami, Sayuri

doi:10.3233/nre-141085

Cited by 13 publications

(3 citation statements)

References 14 publications

(16 reference statements)

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“…In controls, our results are consistent with previous findings showing that the amplitude of the F waves increases with increasing levels of tonic voluntary activity (Suzuki et al 1993). Even some reports showed that the size of F waves increases by imagining increasing levels of tonic voluntary activity (Bunno et al 2014;Suzuki et al 2014). It is possible that in humans with SCI the responsiveness of the motoneuron pool decreases during voluntary activity.…”

Section: Discussionsupporting

confidence: 92%

Changes in motoneuron excitability during voluntary muscle activity in humans with spinal cord injury

Vastano

Perez

2020

Journal of Neurophysiology

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The excitability of resting motoneurons increases following spinal cord injury (SCI). The extent to which motoneuron excitability changes during voluntary muscle activity in humans with SCI, however, remains poorly understood. To address this question, we measured F waves by using supramaximal electrical stimulation of the ulnar nerve at the wrist and cervicomedullary motor-evoked potentials (CMEPs) by using high-current electrical stimulation over the cervicomedullary junction in the first dorsal interosseous muscle at rest and during 5 and 30% of maximal voluntary contraction into index finger abduction in individuals with chronic cervical incomplete SCI and aged-matched control participants. We found higher persistence (number of F waves present in each set) and amplitude of F waves at rest in SCI compared with control participants. With increasing levels of voluntary contraction, the amplitude, but not the persistence, of F waves increased in both groups but to a lesser extent in SCI compared with control participants. Similarly, the CMEP amplitude increased in both groups but to a lesser extent in SCI compared with controls. These results were also found at matched absolutely levels of electromyographic activity, suggesting that these changes were not related to decreases in voluntary motor output after SCI. F-wave and CMEP amplitudes were positively correlated across conditions in both groups. These results support the hypothesis that the responsiveness of the motoneuron pool during voluntary activity decreases following SCI, which could alter the generation and strength of voluntary muscle contractions. NEW & NOTEWORTHY How the excitability of motoneurons changes during voluntary muscle activity in humans with spinal cord injury (SCI) remains poorly understood. We found that F-wave and cervicomedullary motor-evoked potential amplitude, outcomes reflecting motoneuronal excitability, increased during voluntary activity compared with rest in SCI participants but to a lesser extent that in controls. These results suggest that the responsiveness of motoneurons during voluntary activity decreases following SCI, which might affect functionally relevant plasticity after the injury.

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Section: Discussionsupporting

confidence: 92%

Changes in motoneuron excitability during voluntary muscle activity in humans with spinal cord injury

Vastano

Perez

2020

Journal of Neurophysiology

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“…The activation the motor system and modulation of F-wave during MI show conflicting results. There are mixed reports that F-waves show no change 23,24 or increase 25,26 during MI, which needs further clarification. Bunno 9 examined the change in spinal motor neuron excitability between rest and during KMI.…”

Section: Differences In Motor Imagery Strategy Change Behavioral Outcomementioning

confidence: 88%

Differences in motor imagery strategy change behavioral outcome

Fukumoto

Todo²,

Bunno³

et al. 2022

Sci Rep

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Kinesthetic motor imagery (KMI) involves imagining the feeling and experience of movements. We examined the effects of KMI, number visualizing, and KMI with number visualizing on the excitability of spinal motor neurons and a behavioral outcome measure in a pinch force task. Healthy participants (13 men and 8 women; mean age: 24.8 ± 5.5 years) were recruited. We compared the F-waves of the left thenar muscles after stimulating the left median nerve at the wrist during each motor imagery condition after a practice session. The KMI condition consisted of imagining muscle contraction, the number visualizing condition consisted of imagining the pinch force increasing numerically, and the KMI with number visualizing consisted of alternating between the KMI and imagining the pinch force increasing numerically. Before and after motor imagery, the time required to adjust to the target pinch force was compared. The time required to adjust the pinch force was shorter in the KMI with number visualizing condition than in the KMI and number visualizing conditions. There was no difference in the F/M amplitude ratio between each MI strategy condition, indicating the excitability of spinal motor neurons. Numerical information helped to improve the ability of participants to perform KMI.

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“…Activation of the primary motor area, supplementary motor area, premotor area, primary somatosensory area, dorsolateral prefrontal area, cingulate cortex, and cerebellar regions occurred during motor imagery [28][29][30]. Furthermore, Suzuki et al [31] reported the excitability of spinal motor neurons in the motor imagery condition to be influenced by the descending pathways from the cerebral nervous system. We attribute this to the influence of the descending pathways corresponding to the thenar muscle.…”

Section: Relationship Between Duration In the Motor Imagery And Spinamentioning

confidence: 99%

Effective Motor Imagery Application: Examining Spinal Cord Excitability from the F-Wave and Autonomic Nervous Activity from LF/HF

Fukumoto¹

2020

Somatosensory and Motor Research

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Motor imagery can be helpful for the therapeutic approach for the patients who have difficulty in the actual motion. This chapter explains the following important six points for getting high-effective motor imagery based on the neuroscience. First, excitability of spinal motor neuron was increased by motor imagery. However, adding effect on breathing state, both expiration and inspiration phase on the relax respiration, does not influence the excitability of spinal motor neuron. Also, motor imagery increased the excitability of spinal motor neuron and cardiac sympathetic nerve activity. However, vividness of motor imagery was to converge a degree. Motor practice before motor imagery was important. Motor practice was appropriate for 30 s using intermittent visual feedback, and for doing motor imagery, time enough was 1 min. Adding motor imagery method was a recommended composite for kinesthetic and visual motor imagery. Unfortunately, motor imagery has few effects for the other hand. Therefore, motor imagery should be done on the ipsilateral side from the previous motor practice.

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Excitability of spinal neural function by motor imagery with isometric opponens pollicis activity: Influence of vision during motor imagery

Cited by 13 publications

References 14 publications

Changes in motoneuron excitability during voluntary muscle activity in humans with spinal cord injury

Changes in motoneuron excitability during voluntary muscle activity in humans with spinal cord injury

Differences in motor imagery strategy change behavioral outcome

Effective Motor Imagery Application: Examining Spinal Cord Excitability from the F-Wave and Autonomic Nervous Activity from LF/HF

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