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Two functional muscle groupings during postural equilibrium tasks in standing cats
1R. S. Dow Neurological Sciences Institute, Portland, Oregon 97209, USA.
Journal of Neurophysiology
|October 1, 1996
Summary
Cats utilize distinct muscle activation patterns to maintain balance. Specific thigh muscle groups coordinate with vertical (Fz) and horizontal (Fy) forces, simplifying limb control during postural equilibrium tasks.
Area of Science:
- Neuroscience
- Biomechanics
- Motor Control
Background:
- Maintaining postural equilibrium is crucial for animals.
- Limb force application against the support surface enables control of the center of mass.
Purpose of the Study:
- To investigate the relationship between electromyographic (EMG) activation and hindlimb joint torques during postural control in cats.
- To understand the neural strategies underlying rapid, automatic postural responses.
Main Methods:
- Cats were trained to stand on a movable force platform and were subjected to perturbations.
- Electromyographic activity of thigh muscles, ground reaction forces, and hindlimb kinematics were recorded.
- Net joint torques were calculated using inverse dynamics.
Main Results:
- Thigh muscles were divided into two functional groups based on their activation patterns.
- One group correlated with the vertical force component (Fz), while the other correlated with the difference between knee and hip torque (related to Fz and Fy).
Conclusions:
- Muscle activation patterns suggest a neural strategy of parallel control for different force components (Fz and Fy).
- This parallel control simplifies the management of multi-jointed limbs during postural equilibrium and other force-related tasks.