Rampinini E, Alberti G, Fiorenza M, Riggio M, Sassi R, Borges T O, Coutts A J
S. S. MAPEI srl, Human Performance Laboratory, Olgiate Olona, Italy.
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milano, Italy.
Int J Sports Med. 2015 Jan;36(1):49-53. doi: 10.1055/s-0034-1385866. Epub 2014 Sep 25.
We compared the accuracy of 2 GPS systems with different sampling rates for the determination of distances covered at high-speed and metabolic power derived from a combination of running speed and acceleration. 8 participants performed 56 bouts of shuttle intermittent running wearing 2 portable GPS devices (SPI-Pro, GPS-5 Hz and MinimaxX, GPS-10 Hz). The GPS systems were compared with a radar system as a criterion measure. The variables investigated were: total distance (TD), high-speed distance (HSR>4.17 m·s(-1)), very high-speed distance (VHSR>5.56 m·s(-1)), mean power (Pmean), high metabolic power (HMP>20 W·kg(-1)) and very high metabolic power (VHMP>25 W·kg(-1)). GPS-5 Hz had low error for TD (2.8%) and Pmean (4.5%), while the errors for the other variables ranged from moderate to high (7.5-23.2%). GPS-10 Hz demonstrated a low error for TD (1.9%), HSR (4.7%), Pmean (2.4%) and HMP (4.5%), whereas the errors for VHSR (10.5%) and VHMP (6.2%) were moderate. In general, GPS accuracy increased with a higher sampling rate, but decreased with increasing speed of movement. Both systems could be used for calculating TD and Pmean, but they cannot be used interchangeably. Only GPS-10 Hz demonstrated a sufficient level of accuracy for quantifying distance covered at higher speeds or time spent at very high power.
我们比较了两种具有不同采样率的全球定位系统（GPS）在确定高速跑距离以及结合跑步速度和加速度得出的代谢功率方面的准确性。8名参与者佩戴2台便携式GPS设备（SPI-Pro，GPS采样率为5Hz；MinimaxX，GPS采样率为10Hz）进行了56次穿梭间歇跑。将GPS系统与作为标准测量的雷达系统进行比较。所研究的变量包括：总距离（TD）、高速距离（HSR>4.17米·秒⁻¹）、极高速距离（VHSR>5.56米·秒⁻¹）、平均功率（Pmean）、高代谢功率（HMP>20瓦·千克⁻¹）和极高高代谢功率（VHMP>25瓦·千克⁻¹）。GPS-5Hz在TD（2.8%）和Pmean（4.5%）方面误差较低，而其他变量的误差从中等至较高（7.5 - 23.2%）。GPS-10Hz在TD（1.9%）、HSR（4.7%）、Pmean（2.4%）和HMP（4.5%）方面显示出较低误差，而VHSR（10.5%）和VHMP（6.2%）的误差为中等。总体而言，GPS准确性随着采样率提高而增加，但随着运动速度增加而降低。两种系统都可用于计算TD和Pmean，但不能互换使用。只有GPS-10Hz在量化更高速度下跑过的距离或极高高功率下花费的时间方面显示出足够的准确性水平。
