Resonant frequencies of standing humans

Article Abstract:

Research has found the range of whole-body resonant frequencies of standing people to be between 9.1 to 15.7 Hz. A seated person's whole-body resonant frequency is around 5 Hz. The whole body resonant frequency in the context of industrial employment is very important factor. Many workers are thought to suffer from illness or injury due to the exposure to constant low-frequency vibration. The weight of the body does not have a great influence on resonant frequency. Some 113 people were studied whilst they were subjected to a very low acceleration magnitude from a vibrating beam.

Standing position, Resonant vibration, Blue collar workers

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Field studies of comfort and discomfort in sitting

Article Abstract:

Research into the levels of comfort and discomfort experienced by people, whilst sitting in chairs, found that comfort could be measured as being applied to the design of the chair and as a feeling of being relaxed. A feeling of discomfort can be applied either to the way a chair has been made or a physical feeling, such as being tired. The studies concluded that the look of a chair will affect how comfortable it is perceived to be by the person using it. The two studies used both secretaries and managers in their place of work.

Office furniture, except wood, Office Furniture (except Wood) Manufacturing, Metal Office Furniture, Chair design, Office workers

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Basic study of the portable fatigue meter: effects of illumination, distance from eyes and age

Article Abstract:

A study of a Portable Fatigue Meter (PFM) found that the critical flicker fusion frequency (CFF) differed according to the age of the subject. These findings were in line with earlier research using a standard flicker test. A second study into the effect on CFF values from illumination intensity found that if the luminance counter did not register a change in intensity the values were unaffected. The PFM may be used to assess tiredness of workers in the workplace.

Medical Instruments and Supplies, Medical Equipment and Supplies Manufacturing, Ophthalmological & Audiometric Eqp, Testing, Eyestrain, Asthenopia, Ophthalmic equipment, Flicker fusion

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