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Psyc 552 Ergonomics & Biomechanics

Psyc 552 Ergonomics & Biomechanics. Lecture 7. Muscle Strength. Maximum voluntary exertion levels The maximum force that a muscle can produce under prescribed conditions. This force is well below the physiological tolerance of bones, tendons, and muscles. Strength. Dynamic… Static…

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Psyc 552 Ergonomics & Biomechanics

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  1. Psyc 552 Ergonomics & Biomechanics Lecture 7

  2. Muscle Strength • Maximum voluntary exertion levels • The maximum force that a muscle can produce under prescribed conditions. • This force is well below the physiological tolerance of bones, tendons, and muscles

  3. Strength • Dynamic… • Static… • Output can be • Force produced at some point on the body • Moment or torque produced about a given joint

  4. Strength Measurements • Highly dependent on time… • Dynamic strength is highly influenced by velocity.

  5. Strength testing criteria • Safe • Reliable • Practical

  6. Factors Affecting Strength • Posture • Velocity • Acceleration

  7. Using Static Strength Data

  8. Electromyography (EMG) • Measures muscle action potentials and/or motor unit potentials • Recording methods…

  9. Estimation of Force • Fm=[G x NEMG x f(length) x f(vel)]+ Fp

  10. Psychophysical Strength Method • Kroemer (1982) liftest

  11. Factors Affecting Strength (cont) • Gender • Age • Anthropometry

  12. Other Measurements • Intradisc pressure Image from: http://www.spineuniverse.com/displayarticle.php/article1267.html

  13. Other Measurements (cont) • Intra abdominal pressure • Stature • Vibration

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