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Biomechanical Principles of Temporal Muscle Activation in Functional Movements: Implications for Stability and
1Department of Smart Safety Systems, Dongyang University, Dongducheon Campus, Pyeonghwa-ro Dongducheon-Si, Gyeonggi-do 11307, South Korea.
Temporal muscle activation patterns are crucial for movement control. This review highlights how timing, sequencing, and duration of muscle firing reveal insights into biomechanical strategies for tasks like lifting and gait.
Area of Science:
- Biomechanics
- Neuroscience
- Movement Science
Background:
- Electromyography (EMG) traditionally focuses on amplitude, but temporal features offer deeper insights.
- Temporal muscle activation patterns (onset, offset, sequencing, duration) are vital for movement control.
Purpose of the Study:
- To review temporal muscle activation patterns in functional movements.
- To examine neuromechanical strategies governing movement stability and load regulation.
Main Methods:
- Narrative review of peer-reviewed studies.
- Studies published between 1990 and 2025.
- Focus on temporal EMG features in lifting, gait, and sit-to-stand transitions.
Main Results:
- A consistent principle: proximal muscle activation precedes distal force generation for stability and momentum.
- Lifting: Trunk activation modulates spinal load; altered timing in low back pain indicates inefficiency.
- Gait: Aging/pathology show prolonged distal activation, impairing push-off.
- Sit-to-stand: Specific sequence (tibialis anterior, trunk, extensors); deviations increase joint loading.
Conclusions:
- Temporal EMG patterns are biomechanically meaningful control variables.
- Understanding these patterns is key for assessing functional movement.
- Deviations from typical temporal patterns are linked to reduced efficiency and increased joint loading.
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