Basic aspects of action tremors in the human M. brachioradialis
Related Experiment Video
Updated: Nov 7, 2026

Setup for the Quantitative Assessment of Motion and Muscle Activity During a Virtual Modified Box and Block Test
Published on: January 12, 2024
1University Hospital of Leiden.
Abstract:
Since the first measurements of tremors it was obvious that the tremor signal originates from very complicated and continuously changing nervous and mechanical factors. However, the tremors originate in the beginning from the action tremors of the skeletal muscles. In this study the basic structure of the action tremors, regular 13-Hz oscillations, was revealed (measured by an accelerometer fixed on the distal end of the muscle belly of the m. brachioradialis). The mechanical oscillations measured with this technique had a linear relationship to the electrical oscillations of the EMG. Further, harmonic interference of isometric contraction with faradic contraction was observed. During simultaneous contraction of neighbouring muscles, completely synchronous but exactly out-of-phase oscillations were observed.
More Related Videos
09:14Surface Electromyographic Biofeedback as a Rehabilitation Tool for Patients with Global Brachial Plexus Injury Receiving Bionic Reconstruction
Published on: September 28, 2019
06:44Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand
Published on: May 20, 2020
Related Concept Videos
Muscles that Move the Forearm
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
Muscles of the Forearm that Move the Hand and Fingers
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Muscle Coordination and Action
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
Bones of the Upper Limb: Radius
The radius has a nail-shaped head, and a short...
Alterations in Muscle Tone lll
Muscles that Move the Arm
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...