Motor time (MT) of the rectus femoris muscle for knee extension under loading on the leg with different weights and latency of isometric tension from the onset of electromyographic activities of the muscle were examined in 7 normal men. MT was linearly related to weights-loaded, indicating that the rate of rapid development of tension was almost linear even in its early phase. MT without a load obtained by calculation using the regression equation and the estimated weight of the leg and foot coincided with latency of isometric tension. It is assumed that MT is composed of two consecutive phases, a tension-lag phase and a rapid tension-developing phase.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.2466/pms.1984.59.3.907 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparison of costoclavicular and lateral sagittal infraclavicular approaches in ultrasound-guided brachial plexus block.
Agri
January 2025
Department of Anesthesiology and Reanimation, Yozgat City Hospital, Yozgat, Türkiye.
Objectives: Lateral sagittal infraclavicular approach is frequently used because it has less risk of complications and provides rapid and adequate regional anesthesia. Due to the fact that the brachial plexus is deeper in the infraclavicular region and the approach angle is sharper, it can be technically challenging. In this study, we aimed to compare the costoclavicular approach, which is a newly defined approach, with the lateral sagittal infraclavicular brachial plexus block.
View Article and Find Full Text PDFMotor decision-making under uncertainty and time pressure.
J Neurophysiol
February 2025
Centre for Sensorimotor Performance, School of Human Movement and Nutrition SciencesThe University of QueenslandBrisbaneQueenslandAustralia.
Purposeful movement often requires selection of a particular action from a range of alternatives, but how does the brain represent potential actions so that they can be compared for selection, and how are motor commands generated if movement is initiated before the final goal is identified? According to one hypothesis, the brain averages partially prepared motor plans to generate movement when there is goal uncertainty. This is consistent with the idea that motor decision-making unfolds through competition between internal representations of alternative actions. An alternative hypothesis holds that only one movement, which is optimized for task performance, is prepared for execution at any time.
View Article and Find Full Text PDFMapping Activity and Functional Organisation of the Motor and Visual Pathways Using ADC-fMRI in the Human Brain.
Hum Brain Mapp
February 2025
Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland.
In contrast to blood-oxygenation level-dependent (BOLD) functional MRI (fMRI), which relies on changes in blood flow and oxygenation levels to infer brain activity, diffusion fMRI (DfMRI) investigates brain dynamics by monitoring alterations in the apparent diffusion coefficient (ADC) of water. These ADC changes may arise from fluctuations in neuronal morphology, providing a distinctive perspective on neural activity. The potential of ADC as an fMRI contrast (ADC-fMRI) lies in its capacity to reveal neural activity independently of neurovascular coupling, thus yielding complementary insights into brain function.
View Article and Find Full Text PDFEfficacy and Safety of Adding 1μg/Kg Dexmedetomidine to 20ml Bupivacaine in Supraclavicular Brachial Plexus Block: A Randomized Trial.
Curr Drug Saf
January 2025
Anesthesiology, Surgical Intensive Care and Pain Medicine Department, Faculty of Medicine, Kafr-El Sheikh University, Kafr-El Sheikh, Egypt.
Background: For surgical procedures of the upper limbs, ultrasound-guided supraclavicular brachial plexus block (SCBPB) represents a safe substitute for general anesthesia. The present study evaluated the effectiveness and safety of incorporating 1μg/kg dexmedetomidine (DEX) into 20 ml bupivacaine, as opposed to using 20 ml and 30 ml bupivacaine without additives, in SCBPB.
Methods: This randomized, controlled, double-blind study included 75 patients assigned to elective upper-limb surgery under the mid-humerus level.
Bicycle-inspired simple balance control method for quadruped robots in high-speed running.
Front Robot AI
January 2025
Research Institute of Electrical Communication, Tohoku University, Sendai, Japan.
This paper explores the applicability of bicycle-inspired balance control in a quadruped robot model. Bicycles maintain stability and change direction by intuitively steering the handle, which induces yaw motion in the body frame and generates an inertial effect to support balance. Inspired by this balancing strategy, we implemented a similar mechanism in a quadruped robot model, introducing a yaw trunk joint analogous to a bicycle's steering handle.
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!