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Birlik, Gülin
Sezgin, C. Önder
The purpose of the study is to make an assessment of the vibration exposure of a person lying on a stretcher in an ambulance driven at a constant speed. Contrary to seated person, lying person is exposed to vibrations simultaneously at all points. The response of the human body to laterally transmitted vibrations is different than its response to vertically transmitted vibrations. Besides the effective frequency ranges for different parts of the human body are different. In order to establish a base for a sound estimate of the effects of vibration exposure of patients transported to the hospital, accelerations are measured in three directions on healthy persons (three men in trial and eight men in actual measurements). Measurements are done in “supine” and “semi-supine” postures. Head, back (T8) and hip are chosen as the measurement points. The first part of the study comprise the measurements done on the floor of the ambulance at the two points close to the fixation points of the stretcher and at the centre point. Since the three points are not statistically different, the floor measurements are decided to be done at the centre point. In the second part of the study accelerations are measured at the hip, back, head of the lying person and at the centre point on the ambulance floor. The effect of, three different road conditions (hump, cobble stone and asphalt) and the stretcher’s angle on the vibrations transmitted to the persons are assessed. The study is completed by stating the effective frequency ranges for hip, back and head of lying persons.