TY - JOUR
T1 - Individual difference in β-band corticomuscular coherence and its relation to force steadiness during isometric voluntary ankle dorsiflexion in healthy humans
AU - Ushiyama, Junichi
AU - Yamada, Junya
AU - Liu, Meigen
AU - Ushiba, Junichi
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Objective Magnitude of β-band coherent neural activities between the sensorimotor cortex and contracting muscle is known to vary across healthy individuals. To clarify how this variance affects actual motor function, this study examined associations between the corticomuscular coherence (CMC) and force steadiness. Methods CMC was calculated between scalp electroencephalograms (EEGs) over the sensorimotor cortex and surface electromyograms (EMGs) from the tibialis anterior muscle during tonic isometric voluntary ankle dorsiflexion at 30% of maximal effort in 22 healthy individuals. We calculated the maximal peak of CMC (CMCmax), and examined its relations to some measures of force fluctuation, such as the coefficient of variation (ForceCV), the sum of the power spectral density within 1–4 Hz (Forceδ-PSD), 5–14 Hz (Forceα-PSD), and 15–35 Hz (Forceβ-PSD) bands of force signal. Results In all participants showing significant CMC, CMCmax was observed within the β-band. CMCmax was varied across participants (range, 0.084–0.451), and was correlated significantly and positively with ForceCV (r = 0.602, p = 0.003), Forceβ-PSD (r = 0.637, p = 0.001), Forceα-PSD (r = 0.647, p = 0.001), and Forceδ-PSD (r = 0.518, p = 0.014). Conclusion The magnitude of the CMC between EEG over the sensorimotor cortex and EMG of contracting muscle is associated with the amount of force fluctuation during tonic isometric voluntary ankle dorsiflexion in healthy humans. Significance CMC may influence an individual's ability to stabilize their muscle force output.
AB - Objective Magnitude of β-band coherent neural activities between the sensorimotor cortex and contracting muscle is known to vary across healthy individuals. To clarify how this variance affects actual motor function, this study examined associations between the corticomuscular coherence (CMC) and force steadiness. Methods CMC was calculated between scalp electroencephalograms (EEGs) over the sensorimotor cortex and surface electromyograms (EMGs) from the tibialis anterior muscle during tonic isometric voluntary ankle dorsiflexion at 30% of maximal effort in 22 healthy individuals. We calculated the maximal peak of CMC (CMCmax), and examined its relations to some measures of force fluctuation, such as the coefficient of variation (ForceCV), the sum of the power spectral density within 1–4 Hz (Forceδ-PSD), 5–14 Hz (Forceα-PSD), and 15–35 Hz (Forceβ-PSD) bands of force signal. Results In all participants showing significant CMC, CMCmax was observed within the β-band. CMCmax was varied across participants (range, 0.084–0.451), and was correlated significantly and positively with ForceCV (r = 0.602, p = 0.003), Forceβ-PSD (r = 0.637, p = 0.001), Forceα-PSD (r = 0.647, p = 0.001), and Forceδ-PSD (r = 0.518, p = 0.014). Conclusion The magnitude of the CMC between EEG over the sensorimotor cortex and EMG of contracting muscle is associated with the amount of force fluctuation during tonic isometric voluntary ankle dorsiflexion in healthy humans. Significance CMC may influence an individual's ability to stabilize their muscle force output.
KW - Coherence
KW - Electroencephalogram
KW - Electromyogram
KW - Force fluctuation
KW - β-Band oscillation
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U2 - 10.1016/j.clinph.2016.11.025
DO - 10.1016/j.clinph.2016.11.025
M3 - Article
C2 - 28042996
AN - SCOPUS:85007467175
VL - 128
SP - 303
EP - 311
JO - Clinical Neurophysiology
JF - Clinical Neurophysiology
SN - 1388-2457
IS - 2
ER -