Relation between Transportation Method of Stretcher and Ride Quality

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  • ストレッチャーの移送法と乗り心地の関係
  • ストレッチャー ノ イソウホウ ト ノリゴコチ ノ カンケイ

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Abstract

This paper describes the effect of mechanical stimuli such as vibration and rotation during stretcher transport in the hospital on subjective evaluation of ride quality. Ride quality is subjectively evaluated using semantic differential (SD) method. The stretcher is transported in the rectangular course with 14 m×15 m. At each round, four kinds of rotation methods are applied to compare the effect of acceleration and angular velocity on the ride quality : (1) usual rotation performed in the common transport, (2) rotation around subject's head, (3) rotation around subject's foot and (4) rotation around the center of stretcher. After one round transportation applying one of four rotation methods, the subjects are asked to fill in a SD questionnaire table which has 37 kinds of adjectives. Principal component analysis is employed to identify the reason of deterioration of ride quality. Twelve subjects participated in the transportation experiments and the experimental results show that the principal component analysis produces two factors which represent the effect of angular velocity and foot-to-head acceleration on the ride quality. It is suggested that the angular velocity mainly causes the deterioration of the ride quality provoking motion sickness or vomit during transportation.

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