Related Experiment Videos
Postural adjustments associated with rapid voluntary arm movements 1. Electromyographic data
Journal of Neurology, Neurosurgery, and Psychiatry
|June 1, 1984
Summary
Associated postural adjustments in leg and trunk muscles are pre-programmed motor activities. These specific patterns precede focal arm movements and adapt to anticipated events and postural set.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Human voluntary movements involve complex coordination between focal and postural muscles.
- Understanding the anticipatory nature of postural adjustments is crucial for motor control research.
Purpose of the Study:
- To investigate the characteristics of associated postural adjustments during rapid elbow movements.
- To determine if postural muscle activity is pre-programmed and specific to movement type and postural set.
Main Methods:
- Electromyography (EMG) was used to record muscle activity in the legs and trunk of normal subjects.
- Subjects performed rapid, bilateral elbow flexions or extensions under different postural conditions (free-standing vs. supported).
- An opposing load was introduced during some movement trials to assess adaptation.
Main Results:
- Specific EMG patterns were observed in leg and trunk muscles, preceding arm muscle activation.
- Postural muscle activation followed a distal-to-proximal sequence.
- EMG patterns adapted to changes in movement type and postural set over several trials.
Conclusions:
- Associated postural adjustments are pre-programmed motor activities.
- These adjustments are specific to the focal movement, including anticipated events and postural context.
- Motor control systems exhibit anticipatory and adaptive strategies for maintaining stability during voluntary actions.