ArticleJournal of applied physiology (Bethesda, Md. : 1985)2022
Modulations in motor unit discharge are related to changes in fascicle length during isometric contractions.
Article in Journal of applied physiology (Bethesda, Md. : 1985), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 30 citations in OpenAlex.
- Feasibility of High-Density Surface Electromyography for the Detection of Neuromuscular Disorders in Children.Muscle & nerve · 2026Article
- Reduced knee extensor torque steadiness and increased motor unit discharge rate variability in young people with patellofemoral pain: a pilot study.European journal of applied physiology · 2026Article
- Bilateral neuromuscular adaptation to acute unilateral resistance exercise in healthy older adults.GeroScience · 2025Article
- The neuromechanical delay of the quadriceps shortens with increasing contraction intensity.Scientific reports · 2025Article
- Article
- Achilles tendon morpho-mechanical parameters are related to triceps surae motor unit firing properties.Journal of neurophysiology · 2024Article
- Control of motor output during steady submaximal contractions is modulated by contraction history.Experimental brain research · 2024Article
- Boys-men mean-power-frequency differences in progressive exercise to exhaustion, confounded by variability and adiposity.European journal of applied physiology · 2024Article
- Estimates of persistent inward currents in lower limb motoneurons are larger in females than in males.Journal of neurophysiology · 2023Article
- Estimation of the firing behaviour of a complete motoneuron pool by combining electromyography signal decomposition and realistic motoneuron modelling.PLoS computational biology · 2022Article
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Authors and funding
8 authors at 4 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The integration of electromyography (EMG) and ultrasound imaging has provided important information about the mechanisms of muscle activation and contraction. Unfortunately, conventional bipolar EMG does not allow an accurate assessment of the interplay between the neural drive received by muscles, changes in fascicle length and torque. We aimed to assess the relationship between modulations in tibialis anterior muscle (TA) motor unit (MU) discharge, fascicle length, and dorsiflexion torque using ultrasound-transparent high-density EMG electrodes. EMG and ultrasound images were recorded simultaneously from TA using a 32-electrode silicon matrix while performing isometric dorsiflexion contractions at two ankle joint positions (0° or 30° plantar flexion) and torques (20% or 40% of maximum). EMG signals were decomposed into MUs and changes in fascicle length were assessed with a fascicle-tracking algorithm. MU firings were converted into a cumulative spike train (CST) that was cross-correlated with torque (CST-torque) and fascicle length (CST-length). High cross-correlations were found for CST-length (0.60, range: 0.31-0.85) and CST-torque (0.71, range: 0.31-0.88). Cross-correlation delays revealed that the delay between CST-fascicle length (∼75 ms) was smaller than CST-torque (∼150 ms,
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