Effectiveness of the Movable Seat Surface Evaluated from the Difference in the Start Time of Muscle Activity and Anticipatory Postural Adjustment

抄録

Objective: To examine the effects of a movable seat surface with forward tilting and forward locomotion mechanisms from muscle activation time and anticipatory postural adjustment of the trunk and lower limbs in the forward reach task.

Methods: There were 15 healthy adults, and the muscles to be examined were the deltoid muscles, which are the main muscles for reach movement, as well as the left and right external oblique muscles, the left and right erector spinae muscles, and the left and right rectus femoris muscles. The subjects performed a forward reach task using a fixed and a movable seat surface, that was created, and the examiner analyzed the reach time and the start time of each muscle activity.

Results: The reach time did not differ between the two conditions, but the start time of the erector spinae muscle was later than that of the other muscles in the movable condition. Anticipatory postural adjustment associated with reach task was not confirmed.

Conclusion: It was suggested that the movable seat surface enhances the stability of the trunk movement at the beginning of the reach movement and contributes to the reach movement with less sway of the center of gravity.