剣道における足構えと重心動揺の解析

抄録

The location of the stance during the standard position (Chudan-no-kamae) in Kendo measured from skilled Kendo players (n=28) were divided in the two types, high grade type (=HG) and middle grade type (=MG), according to the trained career (=Dan-i and playing career) of them. The length, width and left foot angle made from vertical line estimated from the location of the stance were compared between HG and MG. The differences of equilibrium between HG and MG were studied in student Kendo players (n=10). The parameters of equilibrium determined by analyzing the center of the foot pressure were the displacement of the body sway and the body sway area. These parameters were compared between HG and MG. The length of the stance (cm/Height) was shorter significantly (p< 0.05) in HG (=0.12±0.03)than in MG (=0.15±0.05). In the width and left foot angle of the stance, there was no difference between HG and MG, respectively. The displacement of the body sway was shorter significantly (p< 0.01) in HG than in MG. As the total period kept standing, mean value of the displacement in HG (=716.6mm) was 14% shorter than in MG (=830.6mm). In the body sway area, there was no difference between HG (=28.9± 13.1cm²) and MG (=30.9 ± 17.0cm²). These results suggest that the equilibrium in Kendo posture correlate closely with the length of stance. In the present paper, correlation between biomechanical properties of the different stance types in Kendo players and skill levels of them are also discussed.