Maeda 2 : Relationships between running and functional single leg jumps in jumping variables and kinematics of the lower extremities, focusing on diŠerences between jumping legs. Japan J. Phys. Educ. Hlth. Sport Sci. 60: 151 163, June, 2015 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 speciˆc emphasis on the diŠerences 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),ˆve 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 takeoŠ phase (DHV), 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 DHV in the RSJ were signiˆcantly higher for the D leg than for the ND leg. During the takeoŠ phase in the two jumps, the joint angles and angular velocities of the ankle were signiˆcantly larger for the D leg than for the ND leg. Moreover, the symmetry indices of jump height in DJ, DHV 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. Theseˆndings indicate that 1) the asymmetry of jump ability in the RSJ is attributable to the asymmetry of ankle behavior in the touchdown and takeoŠ phases, and 2) among FJs, the DJ may be useful for assessing and improving the asymmetry of the RSJ.

亀田 麻依 1) 水谷 未来 2) 杉山 敬 3, 4) 木葉 一総 5) 前田 明 1) バスケットボール選手の予測不可能条件下におけるサイドステップが 切り返し動作中の下肢および体幹に及ぼす影響 1) 鹿屋体育大学スポーツパフォーマンス研究センター 〒891-2393 鹿児島県鹿屋市白水町1番地 2) 至学館大学短期大学部 〒 474-8651 愛知県大府市横根町名高山 55 3) (旧)東亜大学人間科学部スポーツ健康学科 〒 751-8503 山口県下関市一の宮学園町 2-1 4) (新)立命館大学立命館グローバル・イノベーション 研究機構 〒525-8577 滋賀県草津市野路東1-1-1 5) 鹿屋体育大学スポーツ・武道実践科学系 〒 891-2393 鹿児島県鹿屋市白水町 1 番地 連絡先 亀田麻依

The aim of this study was to investigate kinetic differences between penultimate foot contact (PEN) and final foot contact (FINAL) during lateral cutting maneuvers (180°turn) performed during side steps under preplanned (Pre) and unpredictable (Un) conditions. The participants were 13 players from a college female basketball team. In the experiment, participants were shown an arrow pointing either right or left on a monitor in front of them while moving with side steps toward the right. When the left arrow was shown, participants moved 3 m to the right, performed lateral cutting to the left, and moved back to the starting spot with side steps. Conversely, when the right