Abstract: This study examined the effect of physiological measurements of users, especially the elderly, with regard to
the design of the chair. Firstly, based on the measurements of center-of-gravity (CG) distortion when standing up, the
design of the chair is created with consideration to the relation of the height. CG distortion increases with age, and this
phenomenon is pronounced in the elderly, especially when they stand up from the lower seat, indicating that this design
requires careful attention. Secondly, CG distortion and the working area while sitting are measured. The CG decreases at
a 25-30cm difference in height between a table and a chair. In this position, the working area is large. Several
observations in this experiment have shown that a 25-30cm difference in height between a table and a chair is ideal when
at the working position. This observation applies to all age brackets. Thirdly, buttock-popliteal length and angles of trunk
and thigh in sitting position are measured to decide the size and the form of the seat. Finally, 3 types of chairs are made
based on the results to explore the subject in detail. Also, an electromyogram (EMG) is recorded to compare muscle
fatigue with the 3 types chairs. A tendency for a type of the chair that supports the thigh, which leads to a lower EMG
reading, is found, suggesting the possibility that the form of the chair can have a direct influence on muscle fatigue when
sitting. In conclusion, based upon these experiments, various tendencies are recognized. As well, a good prospect, which
addresses the particular needs of the elderly users of the chair at work, is identified. Furthermore, the data from this
study should help more informed decisions to be made with regard to overall measurements, the size of individual parts,
and the form relating to the design of the chair at work.
Abstract: This study examined the effect of physiological measurements of users, especially the elderly, with regard tothe design of the chair. Firstly, based on the measurements of center-of-gravity (CG) distortion when standing up, thedesign of the chair is created with consideration to the relation of the height. CG distortion increases with age, and thisphenomenon is pronounced in the elderly, especially when they stand up from the lower seat, indicating that this designrequires careful attention. Secondly, CG distortion and the working area while sitting are measured. The CG decreases ata 25-30cm difference in height between a table and a chair. In this position, the working area is large. Severalobservations in this experiment have shown that a 25-30cm difference in height between a table and a chair is ideal whenat the working position. This observation applies to all age brackets. Thirdly, buttock-popliteal length and angles of trunkand thigh in sitting position are measured to decide the size and the form of the seat. Finally, 3 types of chairs are madebased on the results to explore the subject in detail. Also, an electromyogram (EMG) is recorded to compare musclefatigue with the 3 types chairs. A tendency for a type of the chair that supports the thigh, which leads to a lower EMGreading, is found, suggesting the possibility that the form of the chair can have a direct influence on muscle fatigue whensitting. In conclusion, based upon these experiments, various tendencies are recognized. As well, a good prospect, whichaddresses the particular needs of the elderly users of the chair at work, is identified. Furthermore, the data from thisstudy should help more informed decisions to be made with regard to overall measurements, the size of individual parts,and the form relating to the design of the chair at work.
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