Our purpose was to compare the influence of motor unit activity in Flexor Digitorum Brevis (FDB) and Soleus (SOL) on force fluctuations during three forward-leaning tasks. Ground reaction forces and high-density EMG signals were collected from 19 males when leaning forward at 25%, 50%, and 75% of maximal forward leaning force. EMG amplitude increased with percent of leaning and was greater for SOL than FDB, but there were no differences in force fluctuations across tasks. Differences in motor unit activity indicated that the relative contribution of the two muscles to the control of balance varied across tasks as confirmed by the association between the fluctuations in neural drive [standard deviation of the filtered cumulative spike train (SD of fCST)] and force [coefficient of variation (CoV) for force]. Specifically, the correlation values were greater for FDB at the lower target forces. Correlation analyses revealed that synaptic noise (CoV for interspike interval) was weakly correlated with the CoV for force, whereas the variability in shared synaptic input (SD of fCST) was strongly correlated with the CoV for force. This finding suggests that the relative influence of the two muscles on the fluctuations in force during forward leaning varied with task requirements.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/02640414.2025.2462356 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of immersive virtual reality-based action observation training integrated with focal muscle vibration on upper extremity in a patient with chronic disability following stroke: a single-subject study.
Physiother Theory Pract
March 2025
Physiotherapy Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy.
Background: The association of different sensory inputs enhances brain plasticity in patients after stroke, but no studies have associated Action Observation Training (AOT) delivered in immersive virtual reality (VR) with Focal Vibration (FV) to elicit a kinesthetic illusion coherent with the observed task to improve motor function.
Objective: The study aimed to evaluate the feasibility of AOT delivered in immersive VR integrated with FV of upper limb muscles on manual dexterity in patients with chronic stroke.
Methods: A single-subject study was conducted (A-B design).
IDA study: post-COVID-19 school readiness vulnerability in children entering primary school in Lazio Region.
Epidemiol Prev
March 2025
Service of Hygene and Public Health (SISP), Local Health Unit 'Roma 5', Guidonia Montecelio, Rome (Italy).
Objectives: to describe the 'IDA' study, which aims to estimate the prevalence of School Readiness Vulnerability (SRV) in children at the beginning of primary school and the associated socioeconomic characteristics, to stimulate the attention of decision-makers on the consequences of the COVID-19 pandemic and the need for specific and timely interventions by the school community, thus preventing negative effects on children's present and future health.
Design: cross-sectional study based on a random sample of children extracted using the cluster sampling technique on the first primary school classes.
Setting And Participants: in October 2022, the IDA study assessed the SRV prevalence and associated risk factors in 628 children of the Lazio Region, aged 67-89 months, 328 males and 292 females.
Kisspeptin fiber and receptor distribution analysis suggests its potential role in central sensorial processing and behavioral state control.
J Neuroendocrinol
March 2025
Department of Physiology, School of Medicine, National Autonomous University of Mexico, Mexico City, Mexico.
Kisspeptin (KP) signaling in the brain is defined by the anatomical distribution of KP-producing neurons, their fibers, receptors, and connectivity. Technological advances have prompted a re-evaluation of these chemoanatomical aspects, originally studied in the early years after the discovery of KP and its receptor Kiss1r. Previously, we characterized (Hernández et al.
View Article and Find Full Text PDFAutism spectrum disorder and 3p24.3p23 triplication: a case report.
J Med Case Rep
March 2025
Child Neurology and Psychiatry Unit, Department of Wellbeing of Mental and Neurological, Dental and Sensory Organ Health, Policlinico Tor Vergata Hospital, Rome, Italy.
Background: The role of copy number variants as genomic mutations causative of neurodevelopmental disorders has been recently established. They can act as risk factors of conditions with multifactorial etiopathogenesis and incomplete penetrance, such as nonsyndromic autism, and, in this case, are often inherited from an unaffected parent. Conversely, dominant syndromes, with high penetrance, can be caused by de novo occurring variants.
View Article and Find Full Text PDFHigher dominant muscle strength is mediated by motor unit discharge rates and proportion of common synaptic inputs.
Sci Rep
March 2025
Laboratory of Exercise Physiology, Department of Movement, Human, and Health Sciences, University of Rome "Foro Italico", Rome, Italy.
Neural determinants explaining the asymmetrical force and skill observed in limb dominance still need to be comprehensively investigated. To address this gap, we recorded myoelectrical activity from biceps brachii using high-density surface electromyography in twenty participants, identifying the maximal voluntary force (MVF) and performing isometric ramp contractions at 35% and 70%MVF and sustained contractions at 10%MVF. Motor unit discharge characteristics were assessed during ramp contractions, the proportion of common synaptic input to motoneurons was calculated with coherence analysis, and the firing rate hysteresis (∆F) was used to estimate spinal motoneuron intrinsic properties.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!