ArticleJournal of neurophysiology2009
Adjustments differ among low-threshold motor units during intermittent, isometric contractions.
Article in Journal of neurophysiology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
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Who cites it
26 citing papers in PubMed.
- Tracking motor units longitudinally across experimental sessions with high-density surface electromyography.The Journal of physiology · 2017Trial
- Reliability of Between-Session Motor Units Behavior: A Comparison of Analytical Approaches for Intervention Studies.Sports (Basel, Switzerland) · 2026Article
- Bilateral neuromuscular adaptation to acute unilateral resistance exercise in healthy older adults.GeroScience · 2025Article
- Neuromusculoskeletal Modeling and Force Prediction: Verification Through Experimental Neuromuscular Dynamics.Annals of biomedical engineering · 2025Article
- Blood flow restriction increases necessary muscle excitation of the elbow flexors during a single high-load contraction.European journal of applied physiology · 2024Article
- Supraspinal, spinal, and motor unit adjustments to fatiguing isometric contractions of the knee extensors at low and high submaximal intensities in males.Journal of applied physiology (Bethesda, Md. : 1985) · 2024Article
- Perceptions of fatigue and neuromuscular measures of performance fatigability during prolonged low-intensity elbow flexions.Experimental physiology · 2023Article
- A geometric approach to quantifying the neuromodulatory effects of persistent inward currents on individual motor unit discharge patterns.Journal of neural engineering · 2023Article
- Effects of continuous cycling training on motor unit firing rates, input excitation, and myosin heavy chain of the vastus lateralis in sedentary females.Experimental brain research · 2022Article
- A computational approach for generating continuous estimates of motor unit discharge rates and visualizing population discharge characteristics.Journal of neural engineering · 2022Article
- Sex-related differences in motor unit firing rates and action potential amplitudes of the first dorsal interosseous during high-, but not low-intensity contractions.Experimental brain research · 2020Article
- A Comparison of Motor Unit Control Strategies between Two Different Isometric Tasks.International journal of environmental research and public health · 2020Article
- Motor unit action potential amplitudes and firing rates during repetitive muscle actions of the first dorsal interosseous in children and adults.European journal of applied physiology · 2019Article
- Vastus lateralis muscle tissue composition and motor unit properties in chronically endurance-trained vs. sedentary women.European journal of applied physiology · 2018Article
- Effects of fatiguing, submaximal high- versus low-torque isometric exercise on motor unit recruitment and firing behavior.Physiological reports · 2018Article
- Translating Fatigue to Human Performance.Medicine and science in sports and exercise · 2016Review
- Motor unit activity in biceps brachii of left-handed humans during sustained contractions with two load types.Journal of neurophysiology · 2016Article
- Preferential distribution of nociceptive input to motoneurons with muscle units in the cranial portion of the upper trapezius muscle.Journal of neurophysiology · 2016Article
- The Role of Parvalbumin, Sarcoplasmatic Reticulum Calcium Pump Rate, Rates of Cross-Bridge Dynamics, and Ryanodine Receptor Calcium Current on Peripheral Muscle Fatigue: A Simulation Study.Computational and mathematical methods in medicine · 2016Article
- Motor Neuron Pools of Synergistic Thigh Muscles Share Most of Their Synaptic Input.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2015Article
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Authors and funding
6 authors.
Funding
Abstract
We investigated the changes in muscle fiber conduction velocity, recruitment and derecruitment thresholds, and discharge rate of low-threshold motor units during a series of ramp contractions. The aim was to compare the adjustments in motor unit activity relative to the duration that each motor unit was active during the task. Multichannel surface electromyographic (EMG) signals were recorded from the abductor pollicis brevis muscle of eight healthy men during 12-s contractions (n = 25) in which the force increased and decreased linearly from 0 to 10% of the maximum. The maximal force exhibited a modest decline (8.5 +/- 9.3%; P < 0.05) at the end of the task. The discharge times of 73 motor units that were active for 16-98% of the time during the first five contractions were identified throughout the task by decomposition of the EMG signals. Action potential conduction velocity decreased during the task by a greater amount for motor units that were initially active for >70% of the time compared with that of less active motor units. Moreover, recruitment and derecruitment thresholds increased for these most active motor units, whereas the thresholds decreased for the less active motor units. Another 18 motor units were recruited at an average of 171 +/- 32 s after the beginning of the task. The recruitment and derecruitment thresholds of these units decreased during the task, but muscle fiber conduction velocity did not change. These results indicate that low-threshold motor units exhibit individual adjustments in muscle fiber conduction velocity and motor neuron activation that depended on the relative duration of activity during intermittent contractions.
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