School of Chiropractic and Sports Science, Murdoch University, Australia. j.peiff
Int J Sports Med. 2011 May;32(5):353-6. doi: 10.1055/s-0031-1271772. Epub 2011 Mar 4.
This study examined the reliability/validity of power output measured using the Fortius Virtual Reality cycle trainer. 10 cyclists (age: 28±6 years; V˙O (2)max: 60.9±7.2 ml · kg (-1) · min (-1); peak power: 393±82 W) completed three 20 km time trials on a Fortius cycle trainer. During each time trial, power output was measured at 1 Hz using the Fortius internal software and a PowerTap power monitor. Validity calculated for the Fortius trainer; Pearson correlation coefficient (r=0.99; 95% CI: 0.98-0.99; p<0.01) and typical error of estimate (3.5%; 95% CI: 3.2-3.9%), was similar to other established laboratory ergometers. No differences (F (2,16)=0.32; p=0.73) in mean 20 km power were observed between trial 1 (253±46 W), 2 (258±49 W), or 3 (255±50 W). Test-retest reliability (intraclass correlation coefficient (ICC) and coefficient of variation (CV)) was better between trial 2 and 3 (ICC=1.00 (CI: 0.98-1.00); CV: 1.6% (CI: 1.1-3.3%)) compared with trial 1 and 2 (ICC=0.98 (CI: 0.91-1.00); CV: 3.3% (CI: 2.2-6.4%)). The Fortius cycle trainer is a valid and reliable device for the measurement of power output in cyclists, thus providing an alternative to larger more expensive laboratory ergometers.
这项研究旨在检验使用 Fortius 虚拟现实自行车训练器测量的输出功率的可靠性/有效性。10 名自行车运动员（年龄：28±6 岁；最大摄氧量（V˙O (2)max）：60.9±7.2 ml·kg(-1)·min(-1)；最大功率：393±82 W）在 Fortius 自行车训练器上完成了三次 20 公里计时赛。在每次计时赛中，使用 Fortius 内部软件和 PowerTap 功率计以 1 Hz 的频率测量功率输出。Fortius 训练器的有效性计算；Pearson 相关系数（r=0.99；95%CI：0.98-0.99；p<0.01）和估计的典型误差（3.5%；95%CI：3.2-3.9%）与其他已建立的实验室测功计相似。在第一次（253±46 W）、第二次（258±49 W）或第三次（255±50 W）试验中，平均 20 公里功率没有差异（F (2,16)=0.32；p=0.73）。试验间可靠性（组内相关系数（ICC）和变异系数（CV））在第二次和第三次试验（ICC=1.00（CI：0.98-1.00）；CV：1.6%（CI：1.1-3.3%））之间优于第一次和第二次试验（ICC=0.98（CI：0.91-1.00）；CV：3.3%（CI：2.2-6.4%））。Fortius 自行车训练器是一种用于测量自行车运动员输出功率的有效且可靠的设备，因此提供了一种替代更大、更昂贵的实验室测功计的方法。
