Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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The Effects of Pulsator Washing Machine on Joints Torques and Muscles Strengths Considering Height of Outside Machine and Depth of Inside Drum for Average Height Users

투입구 높이 및 내부 드럼 깊이를 고려한 펄세이터 세탁기 사용시 평균신장 사용자의 관절 토크 및 근력에 미치는 영향

  • Kim, Seong Guk (Department of Biomedical Engineering, Yonsei University) ;
  • Cho, Young Kuen (Department of Biomedical Engineering, Yonsei University) ;
  • Lee, Nam Gi (Department of Physical Therapy, Yonsei University) ;
  • You, Joshua Sung Hyun (Department of Physical Therapy, Yonsei University) ;
  • Lim, Dohyung (Department of Mechanical Engineering, Sejong University) ;
  • Kim, Han Sung (Department of Biomedical Engineering, Yonsei University) ;
  • Ko, Chang-Yong (Research Team, Korea Orthopedics & Rehabilitation Engineering Center)
  • Received : 2012.09.04
  • Accepted : 2012.11.05
  • Published : 2012.12.31
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Abstract

Many studies have reported that housework done using household appliances may affect biomechanical characteristics of the musculoskeletal system. The purpose of this study was to investigate the effects of housework done using a pulsator washing machine on joints and muscles. We calculated joint torques and muscle strengths on the basis of an experimental/virtual three-dimensional motion analysis for six healthy females using the pulsator washing machine at different heights (H) and depths (D) of the inside drum (H (mm){\times}D (mm), Trial1: $962.5{\times}609.4$, Trial2: $962.5{\times}624.4$, Trial3: $982.5{\times}644.4$, Trial4: $995.5{\times}642.4$, Trial5: $1015.5{\times}677.4$). The joint torques and muscle strengths tended to be considerably different during torso flexion in the sagittal plane for all the trials. The maximum joint torques for the thoracic vertebra, left ankle, and right shoulder measured in Trial4 were significantly higher than those measured in the other trials (p < 0.05); in addition, those for the thoracic vertebra and both ankles measured in Trial5 were significantly higher than those measured in the other trials (p < 0.05). The maximum muscle strengths for the left trapezius muscle and both tibialis anterior muscles measured in Trial5 were significantly higher than those measured in the other trials (p < 0.05). These results indicate that housework done using a pulsator washing machine may affect joint torques and muscle strengths, and these effects are dependent on the height and/or depth of the inside drum of the pulsator washing machine.

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