筋活動と関節角度からみた立ち上がり動作と座り直し動作の検証

抄録

 In the preceding manuscript, they clarified that the wide seat is suitable for sitting postures on chairs and contact site of reseat actions, but this study did not show that the reseating actions factor in the motion of a trunk, foot and arm.
 Additionally, sitting on a chair for a long time in a specific posture causes the bad influence on human bodies because of the continuous pressure on a specific part of a body. Though it is known that the scattering body pressure and contracting muscles, such as reseating actions are effective in preventing such the bad influence, this effect is not analyzed from a muscular load perspective.
 On the other hand, there is standing up motions in terms of motion on the chair. Standing up motions is compounded various ability that is muscle, balance and mobility of joints and trunk.
 Base on above, the objective of this study is to clarify characteristics of standing up motions and reseating actions by confirming muscle activities and joint angles.
 This study is comprised of act observation research, verification survey on muscle activities and joint angles, and motion evaluation. The results are as follows.
 Figure 5, 8 show results of the act observation survey. This survey clarified the contact site between arm, table and chair of standing up motions. Contact site is many edge of table.
 Figure 12, 13 show results of the verification survey on pelvic position and motion evaluation difference by seat shape. They sat on deep position when seat was T-1 and the edge of one's chair when seat was T-3. Also elders and adults evaluated T-3 highly.
 Figure 18 shows results of the verification survey of muscle activities difference by contact site. Thay had a low muscle load when touched [sides of seat / front] and evaluated [sides of seat / front] highly.
 Figure 23 shows results of the verification survey of motion evaluation difference by height of lateral seat. Standing up motions was evaluated height of lateral seat was ±0mm highly and +25mm second. Reseating actions was evaluated +25mm and +50mm highly.
 Figure 24 and table 4 show results of the verification survey on muscle activities and joint angles of standing up motions. In muscle actibities, males had a high muscle load of VL and TA second. Females had a high muscle load of VL and FCR second. Wrist joint angle is different in starting motion and point of maximum muscle strength.
 Figure 25 and table 5 show results of the verification survey on muscle activities and joint angles of reseating actions. In muscle actibities, males had a high muscle load of TB and VL second. Females had a high muscle load of TB and BB or FCR second. Joint angles are different in displacing front and displacing behind.