Tavernite Jake P, Moran Matthew F
Sacred Heart University, College of Health Professions, Department of Physical Therapy & Human Movement Science, Motion Analysis Laboratory. 5151 Park Avenue. Fairfield, USA.
J Hum Kinet. 2020 Jan 31;71:69-77. doi: 10.2478/hukin-2019-0075. eCollection 2020 Jan.
Previous evidence has suggested that there is a relationship between leg stiffness and improved running performance. The purpose of this investigation was to determine how leg stiffness of runners was influenced in the 24 and 48 hour period following a cross country race. Twenty-two collegiate cross-country runners (13 males, 9 females, 19.5 ± 1.4 yr) were recruited and participated in the study. Leg stiffness was assessed 24 hours before and after a race as well as 48 hours post-race. Three jumping protocols were conducted: 1) a static jump, 2) a countermovement jump, and 3) a vertical hopping test. Two embedded force plates (1000 Hz) were utilized to measure ground reaction forces for each test and a metronome was utilized to maintain hopping frequency (2.2 Hz). A significant main effect was found for a static jump, a countermovement jump and leg stiffness. Leg stiffness was significantly reduced 24 hours post-race (pre-race 36.84 kN·m, 24h post 33.11 kN·m, p < 0.05), but not 48 hours post-race (36.30 kN·m). No significant differences were found in post-hoc analysis for the squat jump, countermovement jump height and the eccentric utilization ratio. Following a cross-country race, leg stiffness significantly declined in a group of collegiate runners in the immediate 24 hours post-race, but returned to baseline 48 hours post-race. Sport scientists and running coaches may be able to monitor leg stiffness as a metric to properly prescribe training regiments.
先前的证据表明，腿部僵硬度与跑步成绩的提高之间存在关联。本研究的目的是确定越野赛后24小时和48小时内跑步者的腿部僵硬度是如何受到影响的。招募了22名大学越野跑运动员（13名男性，9名女性，年龄19.5±1.4岁）参与该研究。在比赛前24小时、比赛后24小时以及比赛后48小时对腿部僵硬度进行评估。进行了三种跳跃方案：1）静态跳跃，2）反向运动跳跃，3）垂直单脚跳测试。使用两个嵌入式测力板（1000赫兹）测量每次测试的地面反作用力，并使用节拍器保持单脚跳频率（2.2赫兹）。发现静态跳跃、反向运动跳跃和腿部僵硬度存在显著的主效应。赛后24小时腿部僵硬度显著降低（赛前36.84千牛·米，赛后24小时33.11千牛·米，p<0.05），但赛后48小时没有降低（36.30千牛·米）。深蹲跳、反向运动跳跃高度和离心利用率的事后分析未发现显著差异。越野赛后，一组大学跑步者的腿部僵硬度在赛后立即的24小时内显著下降，但在赛后48小时恢复到基线水平。运动科学家和跑步教练或许能够将监测腿部僵硬度作为一项指标，以便合理安排训练计划。
