The acceleration dependent validity and reliability of 10 Hz GPS
The acceleration dependent validity and reliability of 10 Hz GPS
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DOI：
10.1016/j.jsams.2013.08.005
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发表时间：
2014-09-01
影响因子：
4
通讯作者：
Hayes, Philip R.
中科院分区：
文献类型：
--
作者：
Akenhead, Richard;French, Duncan;Hayes, Philip R.
目的：要检查的有效性和10 Hz的GPS测量瞬时速度在最大accelerations.Design：Experimental.Methods：两个10 Hz的GPS设备固定到一个滑动平台上安装在定制的单轨牵引，而最大超过10米冲刺的可靠性。使用2000赫兹的激光采样测量了全球定位系统装置的位移，从中得出速度和平均加速度。根据平均加速度将速度数据合并到加速度阈值中。使用最小二乘线性回归和Bland-Altman一致性限（LOA）检查激光和GPS测量的瞬时速度在每个加速度阈值内的一致性。单位间信度表示为典型误差（TE）和Pearson相关系数。0-0.99 m s（-2）加速度期间的平均偏差+/- 95% LOA为0.12 +/- 0.27 m s（-1），在加速度>4 m s（-2）期间，降低至-0.40 +/- 0.67 m s（-1）。在加速度0- 10 m s（-2）期间，估计值的标准误差+/- 95% CI（SEE）从0.12 +/- 0.02 m s（-1）增加在加速度>4 m s（-2）时，0.99 m s（-2）至032 +/- 0.06 m s（-1）。在0 ~ 0.99m·s（-2）和>4 m·s（-2）的加速度范围内，TE分别从0.05 ± 0.01增加到0.12 ± 0.01m·s（-1）。结论：10 Hz GPS测量瞬时速度的有效性和可靠性与加速度呈负相关。使用10 Hz GPS的人应该知道，在超过4 m s（-2）的加速度期间，精度会受到影响。(C)2013年澳大利亚运动医学。由爱思唯尔有限公司出版。保留所有权利。
Objectives: To examine the validity and inter-unit reliability of 10 Hz GPS for measuring instantaneous velocity during maximal accelerations.Design: Experimental.Methods: Two 10 Hz GPS devices secured to a sliding platform mounted on a custom built monorail were towed whilst sprinting maximally over 10 m. Displacement of GPS devices was measured using a laser sampling at 2000 Hz, from which velocity and mean acceleration were derived. Velocity data was pooled into acceleration thresholds according to mean acceleration. Agreement between laser and GPS measures of instantaneous velocity within each acceleration threshold was examined using least squares linear regression and Bland-Altman limits of agreement (LOA). Inter-unit reliability was expressed as typical error (TE) and a Pearson correlation coefficient.Results: Mean bias +/- 95% LOA during accelerations of 0-0.99 m s(-2) was 0.12 +/- 0.27 m s(-1), decreasing to -0.40 +/- 0.67 m s(-1) during accelerations >4 m s(-2) Standard error of the estimate +/- 95% CI (SEE) increased from 0.12 +/- 0.02 m s(-1) during accelerations of 0-0.99 m s(-2) to 032 +/- 0.06 m s(-1) during accelerations >4 m s(-2). TE increased from 0.05 +/- 0.01 to 0.12 +/- 0.01 m s(-1) during accelerations of 0-0.99 m s(-2) and >4 m s(-2) respectively.Conclusion: The validity and reliability of 10 Hz GPS for the measurement of instantaneous velocity has been shown to be inversely related to acceleration. Those using 10 Hz GPS should be aware that during accelerations of over 4 m s(-2), accuracy is compromised. (C) 2013 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.