Int J Sports Physiol Perform. 2022 Jan 1;17(1):120-125. doi: 10.1123/ijspp.2021-0137. Epub 2021 Jun 29.
To examine the reproducibility (intradevice and interdevice agreement) of the Rotor 2INpower device under a wide range of cycling conditions.
Twelve highly trained male cyclists and triathletes completed 5 cycling tests, including graded exercise tests at different cadences (70-100 rpm), workloads (100-650 W), pedaling positions (seated and standing), and vibration conditions (20-40 Hz) and an 8-second maximal sprint (>1000 W). An intradevice analysis included a comparison between the power output registered by 3 units of Rotor 2INpower, whereas the power output provided by each one of these units and the gold-standard SRM crankset were compared for the interdevice analysis. Among others, statistical calculations included the standard error of measurement, expressed in absolute (in watts) and relative terms as the coefficient of variation (CV).
Except for the graded exercise test seated at 100 rpm/100 W (CV = 10.2%), the intradevice analysis showed an acceptable magnitude of error (CV ≤ 6.9%, standard error of measurement ≤ 12.3 W) between the 3 Rotor 2INpower. Similarly, these 3 units showed an acceptable agreement with the gold standard in all graded exercise test situations (CV ≤ 4.0%, standard error of measurement ≤ 13.1 W). On the other hand, both the intradevice and interdevice agreements proved to be slightly reduced under high cadences (intradevice: CV ≤ 10.2%; interdevice: CV ≤ 4.0%) and vibration (intradevice: CV ≤ 4.0%; interdevice: CV ≤ 3.6%), as well as during standing pedaling (intradevice: CV ≤ 4.1%; interdevice: CV ≤ 2.5%). Although within the limits of an acceptable agreement, measurement errors increased during the sprint tests (CV ≤ 7.4%).
Based on these results, the Rotor 2INpower could be considered a reproducible tool to monitor power output in most cycling situations.
在广泛的循环条件下，检查 Rotor 2INpower 设备的可重复性（设备内和设备间的一致性）。
12 名训练有素的男性自行车运动员和三项全能运动员完成了 5 项骑行测试，包括不同踏频（70-100rpm）、工作量（100-650W）、踩踏位置（坐姿和站立）和振动条件（20-40Hz）下的分级运动测试以及 8 秒最大冲刺（>1000W）。设备内分析包括比较 3 个 Rotor 2INpower 设备记录的功率输出，而设备间分析则比较每个设备与黄金标准 SRM 曲柄组提供的功率输出。统计计算包括测量误差的标准误差，以瓦特为单位表示绝对值（以瓦特为单位）和相对值（变异系数[CV]）。
除了 100rpm/100W 的坐姿分级运动测试（CV=10.2%）外，设备内分析显示 3 个 Rotor 2INpower 之间的误差幅度可接受（CV≤6.9%，测量误差标准误差≤12.3W）。同样，在所有分级运动测试情况下，这 3 个设备与黄金标准的一致性也令人满意（CV≤4.0%，测量误差标准误差≤13.1W）。另一方面，在高踏频（设备内：CV≤10.2%；设备间：CV≤4.0%）和振动（设备内：CV≤4.0%；设备间：CV≤3.6%）以及站立踩踏时，设备内和设备间的一致性都略有降低（设备内：CV≤4.1%；设备间：CV≤2.5%）。尽管在可接受的一致性范围内，但在冲刺测试期间，测量误差会增加（CV≤7.4%）。
根据这些结果，Rotor 2INpower 可被视为一种在大多数骑行情况下监测功率输出的可重复工具。
