Laboratory of Sport, Expertise and Performance (INSEP), French Institute of Sport, Expertise and Performance, Paris, France.
French Cycling Federation, Saint Quentin en Yvelines, France.
J Strength Cond Res. 2020 Dec;34(12):3554-3559. doi: 10.1519/JSC.0000000000002189.
Granier, C, Hausswirth, C, Dorel, S, and Le Meur, Y. Validity and reliability of the stages cycling power meter. J Strength Cond Res 34(12): 3554-3559, 2020-This study aimed to determine the validity and the reliability of the Stages power meter crank system (Boulder, United States) during several laboratory cycling tasks. Eleven trained subjects completed laboratory cycling trials on an indoor cycle fitted with SRM Professional and Stages systems. The trials consisted of an incremental test at 100 W, 200 W, 300 W, 400 W, and four 7-s sprints. The level of pedaling asymmetry was determined for each cycling intensity during a similar protocol completed on a Lode Excalibur Sport ergometer. The reliability of Stages and SRM power meters was compared by repeating the incremental test during a test-retest protocol on a Cyclus 2 ergometer. Over power ranges of 100-1,250 W, the Stages system produced trivial to small differences compared with the SRM (standardized typical error values of 0.06, 0.24, and 0.08 for the incremental, sprint, and combined trials, respectively). A large correlation was reported between the difference in power output (PO) between the 2 systems and the level of pedaling asymmetry (r = 0.58, p < 0.001). Recalculating PO of the Stages system according to the level of pedaling asymmetry provided only marginal improvements in PO measures. The reliability of the Stages power meter at the submaximal intensities was similar to the SRM Professional model (coefficient of variation: 2.1 and 1.3% for Stages and SRM, respectively). The Stages system is a suitable device for PO measurements, except when a typical error of measurement <3.0% over power ranges of 100-1,250 W is expected.
格兰尼尔、豪斯沃思、德尔和勒梅尔。《Stages 功率计曲柄系统的有效性和可靠性》。《力量与调节研究杂志》34（12）：3554-3559，2020。本研究旨在确定 Stages 功率计曲柄系统（美国博尔德）在几个实验室自行车任务中的有效性和可靠性。11 名经过训练的受试者在配备 SRM 专业型和 Stages 系统的室内自行车上完成实验室自行车测试。测试包括在 100W、200W、300W、400W 下进行递增测试，以及四个 7 秒冲刺。在 Lode Excalibur Sport 测功计上完成类似方案时，确定了每个骑行强度的蹬踏不对称程度。通过在 Cyclus 2 测功计上进行重复测试的测试-再测试方案，比较了 Stages 和 SRM 功率计的可靠性。在 100-1250W 的功率范围内，Stages 系统与 SRM 相比产生了微不足道到较小的差异（递增测试、冲刺测试和组合测试的标准化典型误差值分别为 0.06、0.24 和 0.08）。报告了 2 个系统之间的输出功率（PO）差异与蹬踏不对称程度之间的大相关性（r = 0.58，p <0.001）。根据蹬踏不对称程度重新计算 Stages 系统的 PO 仅提供了 PO 测量的边际改善。在亚最大强度下，Stages 功率计的可靠性与 SRM Professional 模型相似（Stages 和 SRM 的变异系数分别为 2.1%和 1.3%）。Stages 系统是一种适合测量 PO 的设备，除非在 100-1250W 的功率范围内预计测量误差<3.0%。
