Trial reportPloS one2015
Task-Dependent Intermuscular Motor Unit Synchronization between Medial and Lateral Vastii Muscles during Dynamic and Isometric Squats.
Trial report in PloS one, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
15 citing papers in PubMed, 1 synthesis or guideline pooled it, 31 citations in OpenAlex.
- Effects of recreational football on body composition, cardiometabolic health, and functional performance in children and adolescents: a systematic review and meta-analysis.Frontiers in physiology · 2025Pooled it
- Extracting time-frequency feature of single-channel vastus medialis EMG signals for knee exercise pattern recognition.PloS one · 2017Trial
- Relationship Between Intermuscular Synchronization of Upper Leg Muscles and Training Level in Karate Kumite Practitioners.Journal of functional morphology and kinesiology · 2025Article
- EMG-EMG coherence during voluntary control of human standing tasks: a systematic scoping review.Frontiers in neuroscience · 2023Article
- Multiple Groups of Agents for Increased Movement Interference and Synchronization.Sensors (Basel, Switzerland) · 2022Article
- Frequency Shifts in Muscle Activation during Static Strength Elements on the Rings before and after an Eccentric Training Intervention in Male Gymnasts.Journal of functional morphology and kinesiology · 2022Article
- Intermuscular coherence between homologous muscles during dynamic and static movement periods of bipedal squatting.Journal of neurophysiology · 2020Article
- Coordination amongst quadriceps muscles suggests neural regulation of internal joint stresses, not simplification of task performance.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Beta, gamma band, and high-frequency coherence of EMGs of vasti muscles caused by clustering of motor units.Experimental brain research · 2018Article
- Development of a multichannel current-EMG system for coherence modulation with visual biofeedback.PloS one · 2018Article
- Article
- Intermuscular Coherence Between Surface EMG Signals Is Higher for Monopolar Compared to Bipolar Electrode Configurations.Frontiers in physiology · 2018Article
- Effect of training status on beta-range corticomuscular coherence in agonist vs. antagonist muscles during isometric knee contractions.Experimental brain research · 2017Article
- Paradigm Shifts in Voluntary Force Control and Motor Unit Behaviors with the Manipulated Size of Visual Error Perception.Frontiers in physiology · 2017Article
- High-Frequency Intermuscular Coherence between Arm Muscles during Robot-Mediated Motor Adaptation.Frontiers in physiology · 2016Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeMotor unit activity is coordinated between many synergistic muscle pairs but the functional role of this coordination for the motor output is unclear. The purpose of this study was to investigate the short-term modality of coordinated motor unit activity-the synchronized discharge of individual motor units across muscles within time intervals of 5ms-for the Vastus Medialis (VM) and Lateralis (VL). Furthermore, we studied the task-dependency of intermuscular motor unit synchronization between VM and VL during static and dynamic squatting tasks to provide insight into its functional role.
methodsSixteen healthy male and female participants completed four tasks: Bipedal squats, single-leg squats, an isometric squat, and single-leg balance. Monopolar surface electromyography (EMG) was used to record motor unit activity of VM and VL. For each task, intermuscular motor unit synchronization was determined using a coherence analysis between the raw EMG signals of VM and VL and compared to a reference coherence calculated from two desynchronized EMG signals. The time shift between VM and VL EMG signals was estimated according to the slope of the coherence phase angle spectrum.
resultsFor all tasks, except for singe-leg balance, coherence between 15-80Hz significantly exceeded the reference. The corresponding time shift between VM and VL was estimated as 4ms. Coherence between 30-60Hz was highest for the bipedal squat, followed by the single-leg squat and the isometric squat.
conclusionThere is substantial short-term motor unit synchronization between VM and VL. Intermuscular motor unit synchronization is enhanced for contractions during dynamic activities, possibly to facilitate a more accurate control of the joint torque, and reduced during single-leg tasks that require balance control and thus, a more independent muscle function. It is proposed that the central nervous system scales the degree of intermuscular motor unit synchronization according to the requirements of the movement task at hand.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.