scholarly journals Comparison of subjective peripheral sensation, F-waves, and somatosensory evoked potentials in response to a unilateral pinch task measured on the contractile and non-contractile sides

2021 ◽  
Author(s):  
Terumasa Takahara ◽  
Hidetaka Yamaguchi ◽  
Kazutoshi Seki ◽  
Sho Onodera
Keyword(s):  
Evoked Potentials ◽  
Muscle Contraction ◽  
Somatosensory Evoked Potentials ◽  
Isometric Force ◽  
Sensory Threshold ◽  
Left Hand ◽  
Voluntary Muscle ◽  
Pinch Grip ◽  
Right Hand ◽  
F Wave

AbstractDepression of sensory input during voluntary muscle contractions has been demonstrated using electrophysiological methods in both animals and humans. However, the association between electrophysiological responses of the sensory system and subjective peripheral sensation (SPS) during a voluntary muscle contraction remains unclear. Our aim in this study was to describe the changes in SPS, spinal α-motoneuron excitability (F-wave to M-wave amplitude), and somatosensory evoked potentials (SEPs) during a unilateral pinch-grip task. Outcome variables were measured on the side ipsilateral and contralateral to the muscle contraction, and at rest (control). Participants were 8 healthy men, 20.9±0.8 years of age. The isometric pinch-grip task was performed at 30% of the maximum voluntary isometric force measured for the right and left hand separately. The appearance rate of the F-wave during the task was significantly higher for the ipsilateral (right) hand than for the contralateral (left) hand and control condition. Although there was no difference in F-wave latency between hands and the control condition, the amplitude of the F-wave was significantly higher for the ipsilateral (right) hand than for the contralateral (left) hand and the control condition. There was no difference in the amplitude of the SEP at N20. However, the amplitude at P25 was significantly lower for the ipsilateral (right) hand than for the contralateral (left) hand and the control condition. The accuracy rate of detecting tactile stimulation, evaluated for 20 repetitions using a Semmes–Weinstein monofilament at the sensory threshold for each participant, was significantly lower during the pinch-grip task for both the ipsilateral (right) and contralateral (left) hand compared to the control condition. Overall, our findings show that SPS and neurophysiological parameters were not modulated in parallel during the task, with changes in subjective sensation preceding changes in electrophysiological indices during the motor task. Our findings provide basic information on sensory-motor coordination.

Cortical somatosensory evoked potentials in response to hand stimulation

1983 ◽  
Vol 58 (6) ◽  
pp. 885-894 ◽  
Author(s):  
Hans Lueders ◽  
Ronald Peter Lesser ◽  
Joseph Hahn ◽  
Dudley S. Dinner ◽  
George Klem
Keyword(s):  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
Early Period ◽  
Posterior Pole ◽  
Sensory Threshold ◽  
Content Type ◽  
Somatosensory Area ◽  
Accurate Localization ◽  
Intractable Seizures ◽  
Cortical Distribution

✓ Somatosensory evoked potentials were recorded from chronically implanted subdural electrodes in six patients with intractable seizures. The following conclusions were reached: 1) The initial cortical negativity-positivity (N1 with a latency of about 20 msec and P2 with a latency of about 24 msec) recorded in the postcentral area was an expression of the classical primary surface positivity, but N1 was generated by the posterior pole of an early horizontal dipole in area 3b, and P2 was generated by the positive pole of a slightly delayed vertical dipole in area 1 and 2. 2) P2 permitted the most accurate localization of the primary somatosensory area. 3) No potentials were elicited in the primary somatosensory area by stimulation of the ipsilateral hand. 4) No cortical potentials were seen at stimulation intensities below the sensory threshold. The cortical distribution of evoked potentials evoked by weak and strong intensities had significantly different distribution. 5) The recovery function of cortical evoked potentials showed a U-curve with an early period of facilitation (10 to 30 msec) followed by a prolonged period of subnormality which peaked at about 50 msec. The recovery curve at different cortical loci differed.

scholarly journals Sensory gating and suppression of subjective peripheral sensations during voluntary muscle contraction

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Terumasa Takahara ◽  
Hidetaka Yamaguchi ◽  
Kazutoshi Seki ◽  
Sho Onodera
Keyword(s):  
Muscle Contraction ◽  
Sensory System ◽  
Sensory Information ◽  
Sensory Gating ◽  
Electrophysiological Response ◽  
Voluntary Muscle ◽  
Appearance Rate ◽  
Significant Difference ◽  
F Wave ◽  
Voluntary Muscle Contraction

Abstract Background During voluntary muscle contraction, sensory information induced by electrostimulation of the nerves supplying the contracting muscle is inhibited and the somatosensory evoked potentials (SEPs) amplitude decreases. This depression of sensory input during voluntary muscle contraction has been demonstrated by many studies using electrophysiological methods. However, the association between the electrophysiological response of the sensory system during sustained muscle contraction and subjective peripheral sensation (SPS) is still unclear. The aim of this study was to investigate changes in spinal excitability, SEPs, and SPS during voluntary muscle contraction. Results The appearance rate of the F-wave was significantly higher during muscle contraction than rest, whereas no significant difference was observed in F-wave latency between muscle contraction and rest. Furthermore, the P25 amplitude of SEPs was significantly lower during muscle contraction than rest, whereas the N20 amplitude of SEPs exhibited no significant differences. The SPS was significantly lower during muscle contraction than rest Conclusions We conclude that sensory gating, which is found in the P25 component of SEPs during muscle contraction, is one of the neurophysiological mechanisms underlying the suppression of SPS.

scholarly journals Sensory gating and suppression of subjective peripheral sensations during voluntary muscle contraction

2020 ◽  
Author(s):  
Terumasa Takahara ◽  
Hidetaka Yamaguchi ◽  
Kazutoshi Seki ◽  
Sho Onodera
Keyword(s):  
Muscle Contraction ◽  
Sensory System ◽  
Sensory Information ◽  
Sensory Gating ◽  
Electrophysiological Response ◽  
Voluntary Muscle ◽  
Appearance Rate ◽  
Significant Difference ◽  
F Wave ◽  
Voluntary Muscle Contraction

Abstract Background: During voluntary muscle contraction, sensory information induced by electrostimulation of the nerves supplying the contracting muscle is inhibited and the somatosensory evoked potentials (SEPs) amplitude decreases. This depression of sensory input during voluntary muscle contraction has been demonstrated by many studies using electrophysiological methods. However, the association between the electrophysiological response of the sensory system during sustained muscle contraction and subjective peripheral sensation (SPS) is still unclear. The aim of this study was to investigate changes in spinal excitability, SEPs, and SPS during voluntary muscle contraction. Results: The appearance rate of the F-wave was significantly higher during muscle contraction than during rest, whereas no significant difference was observed in F-wave latency between muscle contraction and rest. Furthermore, the P25 amplitude of SEPs was significantly lower during muscle contraction than during rest, whereas the N20 amplitude of SEPs exhibited no significant differences. The SPS was significantly lower during muscle contraction than during rest. Conclusions: We conclude that sensory gating, which is found in the P25 component of SEPs during muscle contraction, is one of the neurophysiological mechanisms underlying the suppression of SPS.

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