Laboratory of Instrumentation, Center of Health and Sport Sciences, Santa Catarina State University, Florianópolis-SC, Brazil.
J Strength Cond Res. 2011 Jul;25(7):2034-9. doi: 10.1519/JSC.0b013e3181e73f6e.
The objectives of this study were (a) to determine the concurrent validity of the flight time (FT) and double integration of vertical reaction force (DIF) methods in the estimation of vertical jump height with the video method (VID) as reference; (b) to verify the degree of agreement among the 3 methods; (c) to propose regression equations to predict the jump height using the FT and DIF. Twenty healthy male and female nonathlete college students participated in this study. The experiment involved positioning a contact mat (CTM) on the force platform (FP), with a video camera 3 m from the FP and perpendicular to the sagittal plane of the subject being assessed. Each participant performed 15 countermovement jumps with 60-second intervals between the trials. Significant differences were found between the jump height obtained by VID and the results with FT (p ≤ 0.01) and DIF (p ≤ 0.01), showing that the methods are not valid. Additionally, the DIF showed a greater degree of agreement with the reference method than the FT did, and both presented a systematic error. From the linear regression test was determined the prediction equations with a high degree of linearity between the methods VID vs. DIF (R = 0.988) and VID vs. FT (R = 0.979). Therefore, the prediction equations suggested may allow coaches to measure the vertical jump performance of athletes by the FT and DIF, using a CTM or an FP, which represents more practical and viable approaches in the sports field; comparisons can then be made with the results of other athletes evaluated by VID.
(a) 以视频法（VID）为参考，确定飞行时间（FT）和垂直反作用力双重积分（DIF）法在估计垂直跳跃高度方面与 VID 的同时效度；(b) 验证这 3 种方法之间的一致性程度；(c) 提出使用 FT 和 DIF 预测跳跃高度的回归方程。20 名健康的男女非运动员大学生参与了本研究。实验涉及在力台（FP）上放置接触垫（CTM），使用距离 FP 3 米且垂直于评估对象矢状面的摄像机。每位参与者进行 15 次反向跳跃，每次跳跃之间间隔 60 秒。VID 获得的跳跃高度与 FT（p≤0.01）和 DIF（p≤0.01）的结果之间存在显著差异，表明这些方法无效。此外，DIF 与参考方法的一致性程度大于 FT，且两者均存在系统误差。通过线性回归测试，确定了 VID 与 DIF（R=0.988）和 VID 与 FT（R=0.979）之间具有高度线性关系的预测方程。因此，建议的预测方程可使教练通过 CTM 或 FP 使用 FT 和 DIF 测量运动员的垂直跳跃表现，这在运动领域代表了更实用且可行的方法；然后可以将这些结果与通过 VID 评估的其他运动员的结果进行比较。
