EMG analysis of stereotyped voluntary movements in man
TLDR
Physiological mechanisms underlying these patterns are analysed and an important conclusion is that the triphasic activity with fast flexion is 'centrally programmed'.Abstract:
EMG activity was recorded in biceps and triceps while subjects voluntarily flexed their elbows during a visual matching task. With fast flexion, the initial EMG was characterized by a triphasic pattern with a burst of activity first in biceps, then in triceps with a silent period in biceps, and finally in biceps again; these components were analysed quantitatively. Smooth flexion was characterized by continuous activity in biceps. Inhibition of tonic activity of triceps in relation to a fast flexion occurred in the 50 ms before the initiation of biceps activity. A patients with a severe pansensory neuropathy performed normally on these tasks. Physiological mechanisms underlying these patterns are analysed; an important conclusion is that the triphasic activity with fast flexion is 'centrally programmed'.read more
Citations
More filters
Journal ArticleDOI
A comparison of computer-based methods for the determination of onset of muscle contraction using electromyography
Paul W. Hodges,Bang H. Bui +1 more
TL;DR: This study compared the relative accuracy of a range of computer-based techniques with respect to EMG onset determined visually by an experienced examiner and found several methods accurately selected the time of onset of EMG activity.
Journal ArticleDOI
Manual motor performance in a deafferented man
TL;DR: It is shown that a man deafferented by a severe peripheral sensory neuropathy could produce a very wide range of preprogrammed finger movements with remarkable accuracy, involving complex muscle synergies of the hand and forearm muscles.
Journal ArticleDOI
Rapid adaptation to Coriolis force perturbations of arm trajectory
James R. Lackner,Paul DiZio +1 more
TL;DR: The results indicate that detailed aspects of movement trajectory are being continuously monitored on the basis of proprioceptive feedback in relation to motor commands, and fail to support current equilibrium point models, both alpha and lambda, of movement control.
Journal ArticleDOI
A physiological mechanism of bradykinesia
Mark Hallett,Shahram Khoshbin +1 more
TL;DR: It is suggested that a normal role of the basal ganglia in movement is to energize the appropriate muscles required to make the movement.
Journal ArticleDOI
Influence of central set on human postural responses
TL;DR: This finding suggests that the initial magnitude of postural responses were centrally set to anticipated postural perturbation amplitudes based on sequential experience with the stimulus, and errors in initial response magnitude appear to be partially corrected by reciprocal antagonist activity.
References
More filters
Journal ArticleDOI
Muscles Alive. Their Functions Revealed by Electromyography. J. V. Basmajian. Baltimore, The Williams and Wilkins Co., 1962. $8.50
Journal ArticleDOI
The relation between force and velocity in human muscle
TL;DR: A later investigation into the heat production during isotonic contraction showed that the shape of the force-velocity curve was governed by the way in which energy was released during shortening: from thermal measurements Hill derived a simple equation relating the two variables.
Journal ArticleDOI
Servo Action in Human Voluntary Movement
TL;DR: Muscular movements are under the control of a servo similar in many ways to those used in engineering control systems but with a subtlety of design not found in man-made servo mechanisms—including an automatic gain compensation for altered load which must be useful for adjusting to reduced g on the Moon.
Journal ArticleDOI
EMG analysis of patients with cerebellar deficits.
TL;DR: EMGs from biceps and triceps were recorded during stereotyped elbow flexion tasks performed by 20 patients fulfilling clinical criteria for 'cerebellar deficits' and the data were compared with previously established normal standards.
Related Papers (5)
Effects of inertial load and velocity on the braking process of voluntary limb movements.
The relationship between speed and amplitude of the fastest voluntary contractions of human arm muscles
H. J. Freund,H J Büdingen +1 more