ArticleExperimental brain research2007
Discharge rate during low-force isometric contractions influences motor unit coherence below 15 Hz but not motor unit synchronization.
Article in Experimental brain research, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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Who cites it
17 citing papers in PubMed, 37 citations in OpenAlex.
- Activation and intermuscular coherence of distal arm muscles during proximal muscle contraction.Experimental brain research · 2014Trial
- Beta-band motor unit coherence and nonlinear surface EMG features of the first dorsal interosseous muscle vary with force.Journal of neurophysiology · 2019Article
- Voluntary reduction of force variability via modulation of low-frequency oscillations.Experimental brain research · 2017Article
- Correlation between discharge timings of pairs of motor units reveals the presence but not the proportion of common synaptic input to motor neurons.Journal of neurophysiology · 2017Article
- Experimental muscle pain increases variability of neural drive to muscle and decreases motor unit coherence in tremor frequency band.Journal of neurophysiology · 2015Article
- The effects of massed versus distributed contractions on the variability of maximal isometric force.Experimental brain research · 2014Article
- Motor unit firing pattern, synchrony and coherence in a deafferented patient.Frontiers in human neuroscience · 2014Article
- Practice improves motor control in older adults by increasing the motor unit modulation from 13 to 30 Hz.Journal of neurophysiology · 2013Article
- Modulation of force below 1 Hz: age-associated differences and the effect of magnified visual feedback.PloS one · 2013Article
- Recruitment of motor units in two fascicles of the semispinalis cervicis muscle.Journal of neurophysiology · 2012Article
- Factors influencing the estimates of correlation between motor unit activities in humans.PloS one · 2012Article
- The interaction of respiration and visual feedback on the control of force and neural activation of the agonist muscle.Human movement science · 2011Article
- Synchronization of presynaptic input to motor units of tongue, inspiratory intercostal, and diaphragm muscles.Journal of neurophysiology · 2011Article
- Origins of spontaneous firing of motor units in the spastic-paretic biceps brachii muscle of stroke survivors.Journal of neurophysiology · 2010Article
- Task failure during standing heel raises is associated with increased power from 13 to 50 Hz in the activation of triceps surae.European journal of applied physiology · 2010Article
- Rectification of the EMG signal impairs the identification of oscillatory input to the muscle.Journal of neurophysiology · 2010Article
- Common input to different regions of biceps brachii long head.Experimental brain research · 2009Article
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
Abstract
The purpose of the study was to determine whether pairs of motor units that discharge action potentials at different rates during isometric contractions exhibit different levels of motor unit synchronization or coherence. Twelve subjects (28.6 +/- 6.1 years) performed isometric contractions at target forces slightly above the recruitment threshold (1.02-20.9%) of an isolated motor unit. Based on audio feedback, subjects maintained a relatively constant discharge rate of the isolated unit for about 80 s. Intramuscular electrodes were used to record the discharge of 47 pairs of motor units at rates that ranged from 8.07 to 13.6 pps. Correlated discharge between pairs of motor units was quantified with the common input strength (CIS) index, k' index, and coherence spectrum. Greater discharge rates across pairs of motor units were predicted (R2 = 0.36, P < 0.001) by higher coherence from 8 to 13 Hz (r = -0.52) and lower coherence from 0 to 4 Hz (r = 0.37). Indexes of motor unit synchronization (CIS and k') were strongly associated with motor unit coherence from 16 to 32 Hz (CIS: R2 = 0.63; k': R2 = 0.4; P = 0.001). The CIS index of motor unit synchronization and the motor unit coherence from 16 to 32 Hz did not vary with discharge rate. In contrast, the k' index of motor unit synchronization declined with discharge rate (r2 = 0.20, P = 0.001). Furthermore, greater discharge rates across pairs of motor units were accompanied by higher motor unit coherence in the 8-13 Hz band and lower motor unit coherence in the 0-4 Hz band. These results demonstrate that differences in discharge rate between pairs of motor units in first dorsal interosseus during low-force, isometric contractions were associated with modulation of the correlation in the discharge times of the two motor units at frequencies less than 15 Hz.
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