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Stiffness control for lower leg muscles in directing external forces
C A Doorenbosch1, J Harlaar, G J van Ingen Schenau
1Institute of Fundamental and Clinical Human Movement Sciences, Vrije Universiteit, Amsterdam, Netherlands. c_a_m_doorenbosch@fbw.vu.nl
Neuroscience Letters
|December 29, 1995
Summary
This study reveals how lower leg muscles control external foot forces during contact tasks. Muscle activation patterns show reciprocal upper leg muscle action for hip/knee torque, while ankle muscles co-activate to maintain constant ankle torque.
Area of Science:
- Biomechanics
- Motor Control
- Human Physiology
Background:
- Understanding the neuromuscular control of posture and movement is crucial.
- Contact force control is essential for tasks like walking and object manipulation.
Purpose of the Study:
- To investigate the role of lower leg muscles in controlling external forces during foot contact tasks.
- To analyze muscle activation patterns and joint torques during controlled force application.
Main Methods:
- Subjects performed contact control tasks requiring precise force regulation.
- Measurements included external force, limb position, and electromyographic (EMG) activity of leg muscles.
- Torque changes at the hip, knee, and ankle were calculated.
Main Results:
- A consistent muscle activation pattern was observed across all subjects.
- Reciprocal activation of upper leg muscles modulated hip and knee torques.
- Strong co-activation of ankle muscles maintained a stable ankle torque.
Conclusions:
- Lower leg muscles play a key role in maintaining stable ankle torque during force control tasks.
- Differential muscle activation strategies are employed by upper and lower leg muscles to achieve task goals.