ハンマー投におけるレジスティッドトレーニングの負荷特性

－高重量ハンマーによる投てきに着目して－

抄録

    The purposes of this study were to investigate load characteristics of the throw with the competition hammer (7.26kg) and the heavier hammer (8.0kg). Sixteen male hammer throwers threw the competition hammer and the heavier hammer with their maximum effort. Utilizing three high-speed video cameras (300fps), three-dimensional coordinates of the hammer head and left middle metacarpophalangeal joint were obtained using the direct linear transformation method. Main results were as follows: 1) The maximum centrifugal force of each phase in the heavier hammer was significantly higher than that of competition hammer during double support phase (DSP) of 3^rd and 4^th revolution. However, significant difference was not found in the average centrifugal force. 2) The centrifugal force in the heavier hammer was significantly higher than that of competition hammer during 14％－23％ and 47－51％ of DSP4. 3) Thirteen throwers showed positive values and three throwers showed negative values of force increment (absolute difference of maximum centrifugal force between the heavier hammer and the competition hammer). These results indicate that throwing the heavier hammer causes load increment, which is intrinsic purpose of resisted training.