Relationships between running and functional single leg jumps in jumping variables and kinematics of the lower extremities, focusing on differences between jumping legs

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  • Sugiyama Takashi
    Graduate School of Education, National Institute of Fitness and Sports in Kanoya
  • Kameda Mai
    Graduate School of Education, National Institute of Fitness and Sports in Kanoya
  • Kageyama Masahiro
    Graduate School of Education, National Institute of Fitness and Sports in Kanoya
  • Kiba Kazufusa
    National Institute of Fitness and Sports in Kanoya
  • Kanehisa Hiroaki
    National Institute of Fitness and Sports in Kanoya
  • Maeda Akira
    National Institute of Fitness and Sports in Kanoya

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Other Title
  • 跳躍変数と下肢キネマティクスにおけるランニングシングルレッグジャンプとファンクショナルシングルレッグジャンプとの関係：脚間差に着目して
  • チョウヤク ヘンスウ ト カシ キネマティクス ニ オケル ランニングシングルレッグジャンプ ト ファンクショナルシングルレッグジャンプ ト ノ カンケイ : キャク カンサ ニ チャクモク シテ

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Abstract

  The present study aimed to clarify the relationships between running and functional single leg jumps in jumping variables and kinematics of the lower extremities in collegiate male basketball players, with specific emphasis on the differences between the two jumping legs. Twelve basketball players performed maximal single leg jumps with a running approach (RSJ) as well as functional jumps (FJs), including drop and bound jumps from a height of 30 cm (DJ), five repeated rebound jumps, vertical countermovement jumps, and squat jumps from a knee angle of 120° (SQJ) using the dominant leg (D-leg) and non-dominant leg (ND-leg). Three-dimensional kinematics data during each jump were collected using a 12 Raptor camera infrared motion analysis system (MAC 3D system) at a sampling frequency of 500 Hz. Jump height, jump index, running velocity, change in horizontal velocity at takeoff phase (ΔHV), reactive strength (%SQJ) and kinematics of the lower extremities were calculated. The symmetry indices of the jumping and kinematics variables were calculated as {2×(D-leg−ND-leg)/(D-leg+ND-leg)}×100. Jump heights, jump indices, and %SQJs in the RSJ and DJ, and ΔHV in the RSJ were significantly higher for the D-leg than for the ND-leg. During the takeoff phase in the two jumps, the joint angles and angular velocities of the ankle were significantly larger for the D-leg than for the ND-leg. Moreover, the symmetry indices of jump height in DJ, ΔHV in RSJ, %SQJ, and kinematics of the ankle joint in the RSJ and DJ were positively correlated with the symmetry index of jump height in the RSJ. These findings indicate that 1) the asymmetry of jump ability in the RSJ is attributable to the asymmetry of ankle behavior in the touchdown and takeoff phases, and 2) among FJs, the DJ may be useful for assessing and improving the asymmetry of the RSJ.<br>

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