biomechanics of skeletal muscle and electrymography n biomechanics of skeletal muscle -readings:...
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Biomechanics of Skeletal Muscleand Electrymography
Biomechanics of skeletal muscle- Readings: Hamill pp 76-81, 103-109
Electromyography- Readings: Hamill pp 81-85; Cram pp 32-37, Ch 3;
DeLuca website tutorial (see slide 31), Hildenbrand and Noble study
Factors Influencing Production of Muscular Tension and Applied
Force Motor unit size Muscle Fiber Type
- Selective recruitment of fiber types:• SO FOG FG
Length - tension relationship Force-velocity relationship Angle of pull
Electromyography
The electromyogram Recording the Electromyogram Factors affecting electromyogram Analyzing the electromyogram Applications of electromyography
Recording the electromyogram Electrodes –
- Size- Number- Placement
Signal conduction – wires or telemetry? Signal conditioning
- Amplification- Filtering- Analog to digital conversion- Integration- Frequency analysis
Applications of electromyography
Timing of excitation Degree of excitation
- Normalization procedures
Muscle force-emg relationship Muscle fatigue Clinical gait analysis Ergonomics Limitations of EMG
Website article reading assignment
Go to website: http://www.delsys.com and download tutorial article on surface electromyography detection and recording
Be prepared to answer the following questions:- What is differential amplification?- What is common mode rejection ratio?- Where should electrodes be placed?- Where should electrodes not be placed?- How large should electrodes be?- Name 3 applications of EMG signal
Further readings (optional) on Emg methodology
DeLuca, C. J. (1997) The use of surface Electromyography in biomechanics. J Appl Biomech, 19:135-163. (can be found on delsys.com website)
Morrish, G. (1999) Surface electromyographyMethods of analysis, reliability, and main applicationsPhysical and Rehabilitation Medicine, 11:171-205.
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