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Vibration, oculomanual coordination & traumatic injuries.

Martin-BJ; Armstrong-TJ
Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, R01-OH-002967, 1994 Aug; :1-67
The overall objective of this study was to emphasize the often ignored or neglected role of movement errors in accidents occurring in vibratory environments. The general hypothesis is that vibration-induced modification of sensory messages, used by the central nervous system to control and regulate sensorimotor activities, contribute to the alteration of both movement accuracy and oculo-manual coordination. The following hypotheses were tested: 1) Involuntary motor activities, such as reflexes, are significantly affected during vibration; 2) Vibration-induced alterations of reflex responses varies with vibration frequency; 3) Involuntary muscle contraction induced by vibration exposure contribute to muscle fatigue; 4) Sensory perception is significantly affected by vibration; 5) Oculo-manual coordination is significantly affected during vibration; 6) Vibration-induced alterations persist after exposure and vary with intensity; 7) Permanent visual control of the upper limbs should compensate to some extent vibration-induced affection of other sensory modalities and contribute to performance improvement; 8) Vibration displacement amplitude should exhibit a high correlation with performance decrement over the 80-200 Hz frequency range, and; 9) Sensorimotor performance should be less affected by high frequency vibration (>200Hz). Withdrawal reflex, tonic vibration reflex, manual reflex, and oculo-manual coordination were studied. Overall, vibration displacement amplitude as low as 0.2mm can produce strong alteration of sensorimotor performances; frequencies about 100 Hz produce the largest effects. Furthermore, visual control of the hand appears to be a necessary condition to limit the vibration-induced degradation of manual tasks but this condition is not sufficient. Finally, dissociation between perception and motor responses suggest that subjective evaluation of vibration-induced discomfort, risk or self assessment of performance during and immediately after vibration exposure should be carefully scrutinized.
Vibration-effects; Musculoskeletal-system-disorders; Reflexes; Visual-motor-performance; Vibration-disease; Sensory-motor-system; Sensory-perceptual-processes; Sensory-perceptual-disorders; Traumatic-injuries; Hand-injuries; Vibration; Musculoskeletal-system; Muscle-tension; Workers; Work-performance
Center for Ergonomics, Department of Industrial Operations Engineering, The University of Michigan, Ann Arbor, MI 48109-2117
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Final Grant Report
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National Institute for Occupational Safety and Health
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University of Michigan at Ann Arbor, Ann Arbor, MI