Open AccessJournal Article
Effects of whole-body vibrations on sensory motor system performance in man.
TLDR
It is concluded that the proprioceptive system through which vibration-induced afferents enter the neurological networks is the common denominator for the observed alterations of the position, velocity, and force controls.Abstract:
The effects of whole body vibration (WBV) were studied on subjects trained to perform on tasks involving blindfolded arm positioning (proprioceptive tasks), tracking of visual targets and control of static and dynamic torques. Subjects were vibrated in a seated position by means of a hydraulic jack. The vibration used (0.1 G at floor level and 18 Hz) was that occasionally encountered on medium-size cruising helicopter. The seat was that of a heliccopter pilot whose foam cushion was 6 cm thick with a density of 26 kg/m3. Systematic past-pointing was observed for both arm flexion and extension. Foot and arm visual tracking precision, as determined by position and velocity errors, increased in both directions. Static and dynamic control, rated by torque holding stability and torque amplitude precision, were also significantly altered compared to pre-stimulus readings. The results are interpreted in relation to current knowledge of the effects of vibration induced at spinal, vestibular, and central nervous system levels. It is concluded that the proprioceptive system through which vibration-induced afferents enter the neurological networks is the common denominator for the observed alterations of the position, velocity, and force controls. Our observations suggest that particular care should be taken in helicopters and other vibrating vehicles to prevent vibration from reaching muscular masses, especially those involved in motor tasks.read more
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