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Biomechanics of Skeletal Muscle and 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
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Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Dec 19, 2015

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Page 1: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

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

Page 2: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

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

Page 3: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 4: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 5: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Muscle Fiber Types

Page 6: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Recruitment proceeds from smallest fibers to largest (the size principle)

Page 7: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 8: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 9: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 10: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Length-tension, Angle of Pull Combined

Page 11: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 12: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 13: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Electromyography

The electromyogram Recording the Electromyogram Factors affecting electromyogram Analyzing the electromyogram Applications of electromyography

Page 14: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

The signal

Page 15: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 16: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Recording the electromyogram Electrodes –

- Size- Number- Placement

Signal conduction – wires or telemetry? Signal conditioning

- Amplification- Filtering- Analog to digital conversion- Integration- Frequency analysis

Page 17: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 18: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 19: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Factors affecting the electromyogram

Page 20: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 21: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Analyzing the EMG signal

Page 22: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Timing and degree ofexcitation

Page 23: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 24: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 25: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 26: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 27: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

Applications of electromyography

Timing of excitation Degree of excitation

- Normalization procedures

Muscle force-emg relationship Muscle fatigue Clinical gait analysis Ergonomics Limitations of EMG

Page 28: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 29: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 30: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:
Page 31: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

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

Page 32: Biomechanics of Skeletal Muscle and Electrymography n Biomechanics of skeletal muscle -Readings: Hamill pp 76-81, 103-109 n Electromyography -Readings:

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.