• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Orthopaedic Journal of Sports Medicine >Effects of Game Pitch Count and Body Mass Index on Pitching Biomechanics in 9- to 10-Year-Old Baseball Athletes
【24h】

Effects of Game Pitch Count and Body Mass Index on Pitching Biomechanics in 9- to 10-Year-Old Baseball Athletes

机译：比赛场数和体重指数对9至10岁棒球运动员投球生物力学的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Background: Pitching while fatigued and body composition may increase the injury risk in youth and adult pitchers. However, the relationships between game pitch count, biomechanics, and body composition have not been reported for a study group restricted to 9- to 10-year-old athletes. Hypothesis: During a simulated game with 9- to 10-year-old athletes, (1) participants will experience biomechanical signs of fatigue, and (2) shoulder and elbow kinetics will correlate with body mass index (BMI). Study Design: Descriptive laboratory study. Methods: Thirteen 9- to 10-year-old youth baseball players pitched a simulated game (75 pitches). Range of motion and muscular output tests were conducted before and after the simulated game to quantify fatigue. Kinematic parameters at foot contact, maximum external rotation, and maximum internal rotation velocity (MIRV), as well as maximum shoulder and elbow kinetics between foot contact and MIRV were compared at pitches 1-5, 34-38, and 71-75. Multivariate analyses of variance were used to test the first hypothesis, and linear regressions were used to test the second hypothesis. Results: MIRV increased from pitches 1-5 to 71-75 ( P = .007), and head flexion at MIRV decreased from pitches 1-5 to 34-38 ( P = .022). Maximum shoulder horizontal adduction, external rotation, and internal rotation torques increased from pitches 34-38 to 71-75 ( P = .031, .023, and .021, respectively). Shoulder compression force increased from pitches 1-5 to 71-75 ( P = .011). Correlations of joint torque/force with BMI were found at every pitch period: for example, shoulder internal rotation ( R ~(2)= 0.93, P < .001) and elbow varus ( R ~(2)= 0.57, P = .003) torques at pitches 1-5. Conclusion: Several results differed from those of previous studies with adult pitchers: (1) pitch speed remained steady, (2) shoulder MIRV increased, and (3) shoulder kinetics increased during a simulated game. The strong correlations between joint kinetics and BMI reinforce previous findings that select body composition measures may be correlated with pitching arm joint kinetics for youth baseball pitchers. Clinical Relevance: The results improve our understanding of pitching biomechanics for 9- to 10-year-old baseball pitchers and may be used in future studies to improve evidence-based injury prevention guidelines.
机译：背景：疲劳时投球和身体成分可能会增加青少年和成人投手受伤的风险。但是，尚未报道仅限于9至10岁运动员的研究小组的比赛音高计数，生物力学和身体成分之间的关​​系。假设：在与9至10岁的运动员进行的模拟比赛中，（1）参与者将经历疲劳的生物力学迹象，（2）肩膀和肘部动力学与体重指数（BMI）相关。研究设计：描述性实验室研究。方法：13名9至10岁的青少年棒球运动员投了一场模拟比赛（75场）。在模拟游戏之前和之后进行了运动范围和肌肉输出测试，以量化疲劳。在螺距1-5、34-38和71-75处比较了脚部接触，最大外部旋转和最大内部旋转速度（MIRV）的运动学参数，以及脚部接触和MIRV之间的最大肩膀和肘部动力学。使用方差的多变量分析来检验第一个假设，并使用线性回归来检验第二个假设。结果：MIRV从1-5音调增加到71-75（P = .007），而MIRV的头部屈曲从1-5音调减小到34-38（P = .022）。最大肩部水平内收，外部旋转和内部旋转扭矩从节距34-38增加到71-75（分别为P = .031，.023和.021）。肩部压缩力从1-5螺距增加到71-75（P = 0.011）。在每个俯仰周期都发现关节扭矩/力与BMI的关系：例如，肩部内旋（R〜（2）= 0.93，P <.001）和肘内翻（R〜（2）= 0.57，P =。 003）螺距为1-5时的扭矩。结论：与以前对成人投手的研究结果有些不同：（1）在模拟比赛中，俯仰速度保持稳定;（2）肩部MIRV增加;（3）肩部动力学增加。关节动力学与BMI之间的强相关性加强了先前的发现，即选择身体成分测量值可能与青年棒球投手的俯仰臂关节动力学相关。临床意义：研究结果增进了我们对9至10岁棒球投手投球生物力学的理解，可用于将来的研究中以改进循证伤害预防准则。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号