Faculty of Health, University of Technology Sydney, Sydney, NSW, Australia.
Int J Sports Physiol Perform. 2015 Jan;10(1):106-11. doi: 10.1123/ijspp.2013-0408. Epub 2014 Jun 6.
To investigate the validity and reliability of accelerometry of the SPI-ProX II dual data logger (GPSports, Canberra, Australia).
Controlled laboratory assessments determined the accuracy and reproducibility of raw accelerometer data. Intra- and interdevice reliability assessed the ability of the SPI-ProX II accelerometers to repeatedly measure peak gravitational accelerations (g) during impact-based testing. Static and dynamic validity testing assessed the accuracy of SPI-ProX II accelerometers against a criterion-referenced accelerometer. Dynamic validity was assessed over a range of frequencies from 5 to 15 Hz.
Intradevice reliability found no differences (P < .05) between 4 SPI-ProX II accelerometers, with a low coefficient of variation (1.87-2.21%). SPI-ProX II accelerometers demonstrated small to medium effect-size (ES) differences (0.10-0.44) between groups and excellent interdevice reliability, with no difference found between units (F = 0.826, P = .484). Validity testing revealed significant differences between devices (P = .001), with high percentage differences (27.5-30.5%) and a large ES (>3.44).
SPI-ProX II accelerometers demonstrated excellent intra- and interaccelerometer reliability. However, static and dynamic validity were poor, and caution is recommended when measuring the absolute magnitude of acceleration, particularly for high-frequency movements. Regular assessment of individual devices is advised, particularly for mechanical damage and signal-drift errors. It is recommended that guidelines be provided by the manufacturer on measuring shifts in the base accelerometer signal, including time frames for assessing accelerometer axis, magnitude of errors, and calibration of accelerometers from a stable reference point.
研究 SPI-ProX II 双数据记录仪（GPSports，堪培拉，澳大利亚）加速度计的有效性和可靠性。
控制实验室评估确定了原始加速度计数据的准确性和可重复性。设备内和设备间可靠性评估了 SPI-ProX II 加速度计在基于冲击的测试中重复测量峰值重力加速度（g）的能力。静态和动态有效性测试评估了 SPI-ProX II 加速度计相对于参考标准加速度计的准确性。动态有效性在 5 至 15 Hz 的频率范围内进行评估。
设备内可靠性研究发现，4 个 SPI-ProX II 加速度计之间没有差异（P <.05），变异系数较低（1.87-2.21%）。SPI-ProX II 加速度计在组间显示出较小到中等的效应大小（ES）差异（0.10-0.44），并且设备间具有极好的可靠性，单元之间没有差异（F = 0.826，P =.484）。验证性测试表明设备之间存在显著差异（P =.001），设备间差异百分比高（27.5-30.5%），ES 值大（>3.44）。
SPI-ProX II 加速度计具有极好的设备内和设备间可靠性。然而，静态和动态有效性较差，在测量加速度的绝对值时应谨慎，特别是对于高频运动。建议定期评估各个设备，特别是在出现机械损坏和信号漂移误差时。建议制造商提供关于测量基础加速度计信号偏移的指南，包括评估加速度计轴的时间框架、误差幅度以及从稳定参考点校准加速度计。
