Man under vibration, suffering and protection, Volume 13: by Author Unknown

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Additional resources for Man under vibration, suffering and protection, Volume 13: Proceedings of the International CISM-IFToMM-WHO Symposium, Udine, Italy, April 3-6, 1979

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9. Different positions of the sitting m a n . 36 8 C Position I1 m7km Position I11 Fig. 10. Amplitude-frequency characteristics o f the three cases shown in P i g . 9. Fig. 12. Dynamic characteristics. 37 I a I 1800 I1 1356 I11 900 IV V Fig. 11 38 . Different p o s i t i o n s . Pig. 13. Selected experimental results (measured at the shoulders). 4 _ _ ~ 1i Fig. 14. Selected experimental results (measured at the head). Fig. 15. Amplitude-frequency characteristics. - --1 I I 1L 16 18 20 Hz Fig. 160 Amplitude-frequency characteristics.

Extensive neurophysiological literature is available on the vibration effects on muscle spindles (see Matthews (1972) for a comprehensive review). However, our understanding of the effects of segmental vibrations on human workers in workplace situations is far from complete. We need a more fundamental understanding of the interactions of vibration with various "servo-systems" in the body which gontrol our motor activity. The human operator is prone to making errors in a quick, choice reaction time task.

Amplitude-frequency characteristics. - --1 I I 1L 16 18 20 Hz Fig. 160 Amplitude-frequency characteristics. Mechanical system I * V - Biological system I h Fig. 17. Human body as a system. 41 EF'FETS OF MUSCLE VIBRATION AND JOINT OSCILLATION ON HUMAN MOTOR MECHANISMS Gym C. Agarwal College of Engineering, Unlversiryof Illinois at Chicago Circle, chlcago. A. Gerald L. of Physiology Rush-Presbyterian&. A. SUMMARY The tonic vibration reflex (TVR) affects a joint's response to sinusoidal oscillation in the same facilitatory manner that is seen with tonic voluntary contraction.

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