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전동 및 수동 구급 침상을 이용한 119구급활동의 신체역학적 부하 비교 무작위 마네킨 시뮬레이션 연구

Biomechanical demands comparison in 119 emergency medical services activities when using manual and powered stretcher carts: a scenario-based randomized cross-over simulation study

대한응급의학회지 2019년 30권 6호 p.501 ~ 511
송성욱 ( Song Sung-Wook ) - 제주대학교 의학전문대학원 응급의학교실

강명신 ( Kang Myeong-Sin ) - 서울대학교 의생명연구원 응급의료연구실
강현정 ( Kang Hyun-Jeong ) - 서울대학교 의생명연구원 응급의료연구실
박진형 ( Park Jin-Hyung ) - 서울의료원 응급의학과
최명재 ( Choi Myeong-Jae ) - 서울대학교병원 응급의학과
홍기정 ( Hong Ki-Jeong ) - 서울대학교병원 응급의학과
신상도 ( Shin Sang-Do ) - 서울대학교병원 응급의학과

Abstract


Objective: The purpose of this study was to compare the biomedical demands between a manual stretcher cart (Manual Cot) and a novel powered stretcher cart (Power Cot) during simulated routine stretcher handling activities.

Method: A randomized cross-over design mannequin simulation study was planned. Fourteen participants sequentially performed routine stretcher handling tasks, including unloading, lowering, raising, and loading tasks with the Manual Cot and Power Cot. The biomechanical workload of each participant was assessed by measuring the muscle activity of four muscles (bilateral L4/5 erector spinae and rectus femoris) through an 8-channel electromyogram (EMG) measurement system by attaching the surface EMG. The time required to perform each task was measured, and after the end of the simulation, the participants were given a subjective questionnaire consisting of seven items (five-point Likert scale) on the usefulness and usability of the two stretcher carts.

Results: Fourteen participants, six males and eight females, performed four routine stretcher handling scenarios. The median total task times for the Manual Cot and Power Cot were similar (95 seconds; range, 49-105 vs. 94 seconds; range, 84-140; P=0.063). For the lowering, raising, and loading tasks, the effects of Power Cot were significantly lower than the normalized muscle voluntary contraction (%) cumulative sum of the back or thigh (P<0.05). Compared to Manual Cot, the use of Power Cot resulted in a decrease in total muscle activity of 18.0-63.5% in the back muscles and 6.7-83.9% in the thigh muscles during the task simulation. The participants preferred the Power Cot in terms of usefulness in subjective perceptions.

Conclusion: This simulation study identified that the Power Cot reduced the physical stress of emergency medical services workers without any significant performance time delay when performing stretcher-handling activities.

키워드

tretchers; Emergency medical services; Occupational injuries; Ergonomics; Electromyography
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