Measurement Error in Estimates of Sprint Velocity from a Laser Displacement Measurement Device
Measurement Error in Estimates of Sprint Velocity from a Laser Displacement Measurement Device
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DOI：
10.1055/s-0031-1301313
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发表时间：
2012-06-01
影响因子：
2.5
通讯作者：
Trewartha, G.
中科院分区：
文献类型：
--
作者：
Bezodis, N. E.;Salo, A. I. T.;Trewartha, G.
本研究的目的是确定测量误差与估计的速度从基于激光的设备在不同阶段的最大运动短跑。基于激光的位移数据从10名短跑运动员完成了总共89个短跑，并与五阶多项式函数进行了微分，以获得瞬时速度数据。使用Bland-Altman分析将这些速度估计值与1、5、10、30或50 m处的标准高速视频速度进行比较，以评估偏倚和随机误差。偏差在1 m处最高（+0.41 m/s），并随着测量距离的增加而趋于降低，在30和50 m处的值小于+0.10 m/s。距离之间的随机误差更一致，在10 m处达到最小值（+/-0.11 m/s）。激光设备提供了一种潜在有用的时间有效的工具，用于从中间加速和最大速度阶段（即，在10 m及以上），尽管只有超过0.22-0.30 m/s的差异才应被视为真实的。然而，激光数据不应在短跑的前5米使用，并且可能在评估单个训练期间受试者内表现变化时使用有限。
This study aimed to determine the measurement error associated with estimates of velocity from a laser-based device during different phases of a maximal athletic sprint. Laser-based displacement data were obtained from 10 sprinters completing a total of 89 sprints and were fitted with a fifth-order polynomial function which was differentiated to obtain instantaneous velocity data. These velocity estimates were compared against criterion high-speed video velocities at either 1, 5, 10, 30 or 50 m using a Bland-Altman analysis to assess bias and random error. Bias was highest at 1 m (+0.41 m/s) and tended to decrease as the measurement distance increased, with values less than +0.10 m/s at 30 and 50 m. Random error was more consistent between distances, and reached a minimum value (+/-0.11 m/s) at 10 m. Laser devices off er a potentially useful time-efficient tool for assessing between-subject or between-session performance from the mid-acceleration and maximum velocity phases (i.e., at 10 m and beyond), although only differences exceeding 0.22-0.30 m/s should be considered genuine. However, laser data should not be used during the first 5 m of a sprint, and are likely of limited use for assessing within-subject variation in performance during a single session.