Averaged EMG profiles in jogging and running at different speeds
Marnix G J Gazendam1, At L Hof
1Center for Human Movement Sciences, University of Groningen, 9700 AD Groningen, The Netherlands.
Gait & Posture
|August 5, 2006
Summary
Muscle activation patterns during walking and running differ significantly, especially in the calf muscles. Running involves distinct muscle burst patterns that change with speed, unlike walking.
Area of Science:
- Biomechanics
- Human Movement Science
- Kinesiology
Background:
- Understanding muscle activation patterns is crucial for analyzing locomotion.
- Previous research has identified distinct muscle synergies during gait.
Purpose of the Study:
- To analyze and compare electromyography (EMG) patterns during walking and running.
- To identify basic muscle activation patterns and their relationship to speed and gait phase.
Main Methods:
- Collected EMG data from 14 muscles using surface electrodes in 10 subjects.
- Subjects walked at 1.25-2.25 m/s and ran at 1.25-4.5 m/s.
- EMG data were rectified, time-normalized to the stride cycle, and averaged to create profiles.
Main Results:
- Running EMG profiles decomposed into 10 basic patterns, 8 being single bursts.
- Muscles grouped into quadriceps, hamstrings, calf, and gluteal, sharing common basic patterns.
- Calf muscle activation shifted to early stance in running (86-125%) compared to walking (26-55%).
- Some burst amplitudes were constant, while others varied with running speed, often differently within muscle groups.
- Jogging (low-speed running) showed prolonged stance phases and distinct differences from normal running.
Conclusions:
- Locomotion involves fundamental muscle activation patterns that are largely conserved across speeds and gaits.
- Significant gait-specific adaptations occur, particularly in the calf and quadriceps muscle activation timing.
- Running speed influences muscle activation amplitude and timing, with variations between muscles in the same group.
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