AI Article Synopsis
Article Abstract
Contraction time and half-relaxation time of triceps surae muscle were studied in 9 normal children immediately after they began to stand alone and again 6 weeks later. The velocity properties of the muscle were recorded during isometric twitch induced by supramaximal indirect stimulation. The development of the vertical posture at the end of the first year was found to be associated with prolongation of the contraction time, reaching values observed in 3-year-old children and adults. During the same period the half-relaxation time did not change. Data are reported to show that the influence of the vertical posture on the contraction time is due to changes in the contractile properties of the muscle. It is assumed that the velocity properties of triceps surae are influenced by the long-term activation of the muscle in supporting the vertical posture.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0022-510x(81)90137-4 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Stochastic galvanic vestibular stimulation improves kinetic performance in adolescent idiopathic scoliosis during obstacle negotiation.
Exp Brain Res
January 2025
Department of Rehabilitation Medicine, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, 510080, China.
Vestibular dysfunction has been reported as a potential cause in adolescent idiopathic scoliosis (AIS). However, it remained unclear how stochastic galvanic vestibular stimulation (GVS) affected kinetic performance of patients with AIS. This study aimed to investigate the effect of stochastic GVS on ground reaction forces (GRF) measures during obstacle negotiation among patients with AIS.
View Article and Find Full Text PDFAge-related changes in the vestibulothalamic pathway: association with balance ability and subjective visual vertical of vestibular function.
Brain Res Bull
January 2025
Department of Health, Graduate School, Dankook University, 119, Dandae-ro, Dongnam-gu, Cheonan-si, Chungnam, 31116, Republic of Korea. Electronic address:
Introduction: The thalamus regulates various sensory information to each related brain area. The vestibular nucleus transmits information of motor control to the thalamus regulating coordination function. The vestibulothalamic tract (VTT) is a neural pathway between the vestibular nucleus and thalamus that processes vestibular information for postural balance and spatial perception.
View Article and Find Full Text PDFWriting and drawing tilts after right hemisphere stroke are signs of a wrong verticality representation.
Ann Phys Rehabil Med
January 2025
University Grenoble Alpes, UMR CNRS 5105 Neuropsychology and NeuroCognition, CHU Grenoble Alpes, Dept of NeuroRehabilitation South Hospital, Cs 10217-38043 Grenoble cedex 9, France. Electronic address:
Background: Many signs of spatial dysgraphia and drawing errors after right hemispheric stroke (RHS) have been attributed to spatial neglect or impaired sensory feedback. Counterclockwise (contralesional) tilts of graphomotor productions remained to be explained.
Objective: To test whether graphomotor tilts stem from a tilted representation of verticality transposed to the top/bottom axis of the sheet of paper, using data from the DOBRAS cohort.
Vibration Serviceability Assessment of Floor Structures: Simulation of Human-Structure-Environment Interactions Using Agent-Based Modeling.
Sensors (Basel)
December 2024
Department of Engineering, University of Exeter, Exeter EX4 4QF, UK.
A rapidly growing body of experimental evidence in the literature shows that the effects of humans interacting with vibrating structures, other humans, and their surrounding environment can be critical for reliable estimation of structural vibrations. The Interaction-based Vibration Serviceability Assessment framework (I-VSA) was proposed by the authors in 2017 to address this, taking into account human-structure dynamic interactions (HSI) to simulate the structural vibrations experienced by each occupant/pedestrian. The I-VSA method, however, had limited provisions to simulate simultaneously multiple modes of structure in HSI, to simulate human-human and human-environment interactions, and the movement pattern of the occupants/pedestrians.
View Article and Find Full Text PDFEstimating hip impact velocity and acceleration from video-captured falls using a pose estimation algorithm.
Sci Rep
January 2025
Department of Exercise Science, Syracuse University, 150 Crouse Dr, Syracuse, NY, 13244, USA.
Analyzing video footage of falls in older adults has emerged as an alternative to traditional lab studies. However, this approach is limited by the labor-intensive process of manually labeling body parts. To address this limitation, we aimed to validate the use of the AI-based pose estimation algorithm (OpenPose) in assessing the hip impact velocity and acceleration of video-captured falls.
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!