Relationships between mechanical output from individual joints and jump

抄録

Relationships between provision of mechanical work output from individual joints and jump height in vertical jumps were discussed in this study. Seven male subjects performed 12 sub-maximal to maximal effort squat jumps. Ground reaction force and motion of five anatomical landmarks were recorded and processed by inverse dynamics. Net joint power and work were calculated for ankle, knee, and hip joints, and normalized by the body mass. They were summed and defined as total work output. There were strong linear relationships between jumping height and ankle joint work, and jumping height and total work (r=0.902 and 0.946, respectively). For hip and knee joints, linear relationships were low (r=0.662 and 0.275, respectively). It was found that proportion of the provision of mechanical work output from individual joints varied greatly among subjects. These results implied that pattern-jumping motion was subject specific.