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Different corticospinal control between discrete and rhythmic movement of the ankle.

Goto Y, Jono Y, Hatanaka R, Nomura Y, Tani K, Chujo Y, Hiraoka K - Front Hum Neurosci (2014)

Bottom Line: We investigated differences in corticospinal and spinal control between discrete and rhythmic ankle movements.Motor evoked potentials (MEPs) in the tibialis anterior and soleus muscles and soleus H-reflex were elicited in the middle of the plantar flexion phase during discrete ankle movement or in the initial or later cycles of rhythmic ankle movement.MEP amplitude in the tibialis anterior muscle during the later cycles of rhythmic movement was significantly larger than that during the initial cycle of the rhythmic movement or during discrete movement.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University Habikino, Japan.

ABSTRACT
We investigated differences in corticospinal and spinal control between discrete and rhythmic ankle movements. Motor evoked potentials (MEPs) in the tibialis anterior and soleus muscles and soleus H-reflex were elicited in the middle of the plantar flexion phase during discrete ankle movement or in the initial or later cycles of rhythmic ankle movement. The H-reflex was evoked at an intensity eliciting a small M-wave and MEPs were elicited at an intensity of 1.2 times the motor threshold of the soleus MEPs. Only trials in which background EMG level, ankle angle, and ankle velocity were similar among the movement conditions were included for data analysis. In addition, only trials with a similar M-wave were included for data analysis in the experiment evoking H-reflexes. Results showed that H reflex and MEP amplitudes in the soleus muscle during discrete movement were not significantly different from those during rhythmic movement. MEP amplitude in the tibialis anterior muscle during the later cycles of rhythmic movement was significantly larger than that during the initial cycle of the rhythmic movement or during discrete movement. Higher corticospinal excitability in the tibialis anterior muscle during the later cycles of rhythmic movement may reflect changes in corticospinal control from the initial cycle to the later cycles of rhythmic movement.

No MeSH data available.


Related in: MedlinePlus

Averaged TA-MEPs from a representative subject (A), overall average of SOL-MEP (B) and TA-MEP (C) amplitudes. The black trace indicates MEP under the discrete movement condition, the red trace indicates MEP under the R-1st condition, and the blue trace indicates MEP under the R-10th condition (A). Note that MEP under the R-10th condition is larger than the other two experimental conditions. Bars indicate mean and error bars indicate standard error of mean (B,C). Asterisks indicate significant difference (P < 0.05).
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Figure 7: Averaged TA-MEPs from a representative subject (A), overall average of SOL-MEP (B) and TA-MEP (C) amplitudes. The black trace indicates MEP under the discrete movement condition, the red trace indicates MEP under the R-1st condition, and the blue trace indicates MEP under the R-10th condition (A). Note that MEP under the R-10th condition is larger than the other two experimental conditions. Bars indicate mean and error bars indicate standard error of mean (B,C). Asterisks indicate significant difference (P < 0.05).

Mentions: The hotspot of MEP was 2.0 ± 0.3 cm lateral to and 0.7 ± 0.2 cm anterior to the vertex. The threshold of MEP was 69.7 ± 4.6% of the maximum output, and the TMS intensity delivered during the experiment was 83.6 ± 5.5% of the maximum output. The SOL-MEP amplitude was 374 ± 71 μV (Figure 7B), and was not significantly different among the three experimental conditions (p = 0.497). In contrast, the TA-MEP amplitude was significantly different among the three experimental conditions (p = 0.002). A post hoc test revealed that TA-MEP amplitude in the R-10th condition was significantly larger than that in the Discrete (p = 0.015) and R-1st conditions (p = 0.007), as shown in Figures 7A,C.


Different corticospinal control between discrete and rhythmic movement of the ankle.

Goto Y, Jono Y, Hatanaka R, Nomura Y, Tani K, Chujo Y, Hiraoka K - Front Hum Neurosci (2014)

Averaged TA-MEPs from a representative subject (A), overall average of SOL-MEP (B) and TA-MEP (C) amplitudes. The black trace indicates MEP under the discrete movement condition, the red trace indicates MEP under the R-1st condition, and the blue trace indicates MEP under the R-10th condition (A). Note that MEP under the R-10th condition is larger than the other two experimental conditions. Bars indicate mean and error bars indicate standard error of mean (B,C). Asterisks indicate significant difference (P < 0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4115592&req=5

Figure 7: Averaged TA-MEPs from a representative subject (A), overall average of SOL-MEP (B) and TA-MEP (C) amplitudes. The black trace indicates MEP under the discrete movement condition, the red trace indicates MEP under the R-1st condition, and the blue trace indicates MEP under the R-10th condition (A). Note that MEP under the R-10th condition is larger than the other two experimental conditions. Bars indicate mean and error bars indicate standard error of mean (B,C). Asterisks indicate significant difference (P < 0.05).
Mentions: The hotspot of MEP was 2.0 ± 0.3 cm lateral to and 0.7 ± 0.2 cm anterior to the vertex. The threshold of MEP was 69.7 ± 4.6% of the maximum output, and the TMS intensity delivered during the experiment was 83.6 ± 5.5% of the maximum output. The SOL-MEP amplitude was 374 ± 71 μV (Figure 7B), and was not significantly different among the three experimental conditions (p = 0.497). In contrast, the TA-MEP amplitude was significantly different among the three experimental conditions (p = 0.002). A post hoc test revealed that TA-MEP amplitude in the R-10th condition was significantly larger than that in the Discrete (p = 0.015) and R-1st conditions (p = 0.007), as shown in Figures 7A,C.

Bottom Line: We investigated differences in corticospinal and spinal control between discrete and rhythmic ankle movements.Motor evoked potentials (MEPs) in the tibialis anterior and soleus muscles and soleus H-reflex were elicited in the middle of the plantar flexion phase during discrete ankle movement or in the initial or later cycles of rhythmic ankle movement.MEP amplitude in the tibialis anterior muscle during the later cycles of rhythmic movement was significantly larger than that during the initial cycle of the rhythmic movement or during discrete movement.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University Habikino, Japan.

ABSTRACT
We investigated differences in corticospinal and spinal control between discrete and rhythmic ankle movements. Motor evoked potentials (MEPs) in the tibialis anterior and soleus muscles and soleus H-reflex were elicited in the middle of the plantar flexion phase during discrete ankle movement or in the initial or later cycles of rhythmic ankle movement. The H-reflex was evoked at an intensity eliciting a small M-wave and MEPs were elicited at an intensity of 1.2 times the motor threshold of the soleus MEPs. Only trials in which background EMG level, ankle angle, and ankle velocity were similar among the movement conditions were included for data analysis. In addition, only trials with a similar M-wave were included for data analysis in the experiment evoking H-reflexes. Results showed that H reflex and MEP amplitudes in the soleus muscle during discrete movement were not significantly different from those during rhythmic movement. MEP amplitude in the tibialis anterior muscle during the later cycles of rhythmic movement was significantly larger than that during the initial cycle of the rhythmic movement or during discrete movement. Higher corticospinal excitability in the tibialis anterior muscle during the later cycles of rhythmic movement may reflect changes in corticospinal control from the initial cycle to the later cycles of rhythmic movement.

No MeSH data available.


Related in: MedlinePlus