フォワードランジ(forward lunge : 以下FL)の後脚は身体重心の前方移動の推進と後方移動の制動を担っている。今回、高齢者のFL動作における後脚の関節運動と片脚支持の重心動揺を測定し、後脚の運動とバランス機能の関連を明らかにすることを目的とした。高齢群は左右方向への重心動揺が大きく、床反力の左右成分においても若年群に比べて有意に大きな数値を示した。高齢者のFL動作における後脚の働きは、左右方向への重心移動を制動する能力低下を反映するものと考えられた。若年群では重心動揺測定値とステップ比に高い相関が認められたが、高齢群では認められなかった。これは、開眼片脚起立バランスの低下した高齢者においては、FL動作の後脚が推進力を発生よりも動作時の重心の制動に機能することを示唆していると考えられた。Rear leg during forward lunge exercise bears promotion of movement of center of gravity forward and braking of rear movement. This time, in the elderly persons, we measure the angle of the joint and postural sway of the rear leg. It aimed to clarify the balance function of the rear leg for the relation to the FL exercise in the elderly persons. Elderly group\u27s postural sway to the right and left was especially large, and the floor reaction force increased the force of the right and left direction than young group in the right and left. The characteristic of rear leg during forward lunge exercise in the elderly persons was thought that the braking disability of the postural sway to the right and left was reflected. Moreover, there was a high correlation between compared with a part of postural sway measurements and the step ratio in a young group. However, such a relation was not in the elderly group. In the elderly persons who decreases the resting upright positioning balance, it was suggested that the function of the rear leg of FL exercise in the elderly persons acted on braking of the center of gravity rather than generating the impellent
