Vibration, segmental/whole body

Whole body vibration may affect multiple body parts and organs depending on the vibration characteristics. Segmental vibration, unlike whole body vibration, appears to be more localized in creating injury to the fingers and hands of workers using tools, such as pneumatic hammers, rotary grinders, or other hand tools that cause vibration. 

The complexity of a living organism, and its ability to modify its mechanical properties (e.g., in response to mechanical or physiological demands or muscle tension), necessitates the carefiil design of experiments. There is a large variability in response between individuals. Also, the direct attachment of vibration and shock sensors to soft tissues produces a mechanical load that influences tissue motion. With appropriate measurement methods and instrumentation (ISO 8041,1990), mechanical responses to vibration can be determined for tissues, body segments, and the whole body. 

Exposure of the whole body to vibration (usually through the feet/buttocks when riding in a vehicle). Whole body vibration may increase the risk for injury, including low back pain and internal organ disruption. See also Ergonomics Segmental Vibration (Hand-Arm Vibration). 

Vibration can be a source of discomfort, fatigue or permanent medical conditions. Both whole-body and segmental (e.g. hand-arm vibration) are important. Mai of us are aware of the effect of side-to-side roll of about 0.25 Hz (hertz or cycle per second)... 

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