Abstract：
UNASSIGNED: Multiple studies have analyzed pitching kinematics using motion analysis technology, but lower extremity drive leg impulse (DLI) and drive leg slope (DLS) are not as well characterized. The purpose of this study was to investigate associations between DLI and DLS and pitch velocity as well as angular velocity of the pelvis, trunk, and humerus.
UNASSIGNED: Increased DLI and DLS will be correlated positively with pitch velocity and associated with increased angular velocities in the humerus, trunk, and pelvis.
UNASSIGNED: Retrospective case series.
UNASSIGNED: Level 4.
UNASSIGNED: Three-dimensional motion analyses data from 174 pitchers (age, 17.0 ± 1.0 years; height, 1.82 ± 0.07 m; weight, 80.0 ± 11.3 kg) throwing combined 613 fastball pitches were included. Pitchers threw 2 to 5 pitches, and the variables collected between pitches were averaged and recorded. Statistical analysis was performed using linear regressions to determine the association between DLS as well as DLI and pitch velocity and angular velocities of the pelvis, trunk, and humerus.
UNASSIGNED: Pitchers with higher DLI were associated with lower pitch velocities (β = -22.32; 95% CI, -32.75 to -11.88, P < 0.01). There were no significant associations for DLS and velocity (β = -0.60; 95% CI, -1.48 to 0.29, P = 0.18) or DLS and DLI with rotational velocities except for DLI and trunk kinematics (β = -0.60; 95% CI, -1.48 to 0.29, P = 0.18).
UNASSIGNED: In the combined cohort, DLI correlated negatively with pitch velocity, although this relationship does not exist in the subgroup analysis. Higher DLS was found in pitchers with slower pitch velocities in the elite, high school, and youth groups, although not statistically significant. No associations were found with DLS and any angular velocities between any level of play analyzed in this study, suggesting no consistent association regardless of playing level.
UNASSIGNED: Increased DLI and DLS will be correlated positively with pitch velocity and associated with increased angular velocities in the humerus, trunk, and pelvis.
UNASSIGNED: Retrospective case series.
UNASSIGNED: Level 4.
UNASSIGNED: Three-dimensional motion analyses data from 174 pitchers (age, 17.0 ± 1.0 years; height, 1.82 ± 0.07 m; weight, 80.0 ± 11.3 kg) throwing combined 613 fastball pitches were included. Pitchers threw 2 to 5 pitches, and the variables collected between pitches were averaged and recorded. Statistical analysis was performed using linear regressions to determine the association between DLS as well as DLI and pitch velocity and angular velocities of the pelvis, trunk, and humerus.
UNASSIGNED: Pitchers with higher DLI were associated with lower pitch velocities (β = -22.32; 95% CI, -32.75 to -11.88, P < 0.01). There were no significant associations for DLS and velocity (β = -0.60; 95% CI, -1.48 to 0.29, P = 0.18) or DLS and DLI with rotational velocities except for DLI and trunk kinematics (β = -0.60; 95% CI, -1.48 to 0.29, P = 0.18).
UNASSIGNED: In the combined cohort, DLI correlated negatively with pitch velocity, although this relationship does not exist in the subgroup analysis. Higher DLS was found in pitchers with slower pitch velocities in the elite, high school, and youth groups, although not statistically significant. No associations were found with DLS and any angular velocities between any level of play analyzed in this study, suggesting no consistent association regardless of playing level.
摘要：
■多项研究使用运动分析技术分析了俯仰运动学，但下肢驱动腿冲量(DLI)和驱动腿斜度(DLS)没有很好的表征。这项研究的目的是调查DLI和DLS与俯仰速度以及骨盆角速度之间的关系。树干,还有肱骨.
■增加的DLI和DLS将与俯仰速度呈正相关，并与肱骨中角速度的增加相关。树干,还有骨盆.
■回顾性病例系列。
■4级。
■来自174个投手的三维运动分析数据（年龄，17.0±1.0年；身高，1.82±0.07m；重量，包括80.0±11.3公斤）的投掷组合613个快球投球。投手投了2到5个投球，并且在音高之间收集的变量被平均并记录。使用线性回归进行统计分析，以确定DLS以及DLI与骨盆的俯仰速度和角速度之间的关联。树干,还有肱骨.
■具有较高DLI的投手与较低的投球速度相关（β=-22.32；95％CI，-32.75至-11.88，P<0.01）。除DLI和躯干运动学外，DLS和速度（β=-0.60；95％CI，-1.48至0.29，P=0.18）或DLS和DLI与旋转速度没有显着关联（β=-0.60；95％CI，-1.48至0.29，P=0.18）。
■在合并队列中，DLI与俯仰速度负相关，尽管这种关系在亚组分析中不存在。在精英投球速度较慢的投手中发现了较高的DLS，高中,和青年团体，虽然没有统计学意义。在这项研究中，没有发现DLS和任何水平的游戏之间的任何角速度之间的关联。无论比赛水平如何，都没有一致的联系。
■增加的DLI和DLS将与俯仰速度呈正相关，并与肱骨中角速度的增加相关。树干,还有骨盆.
■回顾性病例系列。
■4级。
■来自174个投手的三维运动分析数据（年龄，17.0±1.0年；身高，1.82±0.07m；重量，包括80.0±11.3公斤）的投掷组合613个快球投球。投手投了2到5个投球，并且在音高之间收集的变量被平均并记录。使用线性回归进行统计分析，以确定DLS以及DLI与骨盆的俯仰速度和角速度之间的关联。树干,还有肱骨.
■具有较高DLI的投手与较低的投球速度相关（β=-22.32；95％CI，-32.75至-11.88，P<0.01）。除DLI和躯干运动学外，DLS和速度（β=-0.60；95％CI，-1.48至0.29，P=0.18）或DLS和DLI与旋转速度没有显着关联（β=-0.60；95％CI，-1.48至0.29，P=0.18）。
■在合并队列中，DLI与俯仰速度负相关，尽管这种关系在亚组分析中不存在。在精英投球速度较慢的投手中发现了较高的DLS，高中,和青年团体，虽然没有统计学意义。在这项研究中，没有发现DLS和任何水平的游戏之间的任何角速度之间的关联。无论比赛水平如何，都没有一致的联系。
