Society, Sports and Physical Exercise Research Group (GIKAFIT), Department of Physical Education and Sport, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Spain.
Society, Sports and Physical Exercise Research Group (GIKAFIT), Department of Physical Education and Sport, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Spain; Biobara, GIKAFIT, Vitoria-Gasteiz, Basque Country, Spain.
Gait Posture. 2022 Feb;92:277-283. doi: 10.1016/j.gaitpost.2021.11.041. Epub 2021 Dec 3.
The Styrd Power Meter is gaining special interest for on-field gait analyses due to its low-cost and general availability. However, the reliability and validity of the Stryd during walking on positive slopes using different backpack loads have never been investigated.
Is the Stryd Power Meter reliable and valid for quantifying gait mechanics during walking on positive inclines and during level walking incorporating load carriage?
Seventeen participants from a police force rescue team performed 8 submaximal walking trials for 5-min at 3.6 km·h during different positive slope (1%, 10% and 20%) and backpack load (0%, 10%, 20%, 30% and 40% of body mass) conditions. Two Stryd devices were utilized for reliability analyses. Validity of cadence and ground contact time (GCT) were analyzed against a gold standard device (Optojump).
The Stryd demonstrated acceptable reliability [mean bias: < 2.5%; effect size (ES): < 0.25; standard error of the mean: < 1.7%; r: > 0.76] for power, cadence, and GCT. Validity measures (mean bias: <0.8%; ES: <0.07; r: >0.96; Lin's Concordance Coefficient: 0.96; Mean Absolute Percent Error: <1%) for cadence were also found to be acceptable. The Stryd overestimated (P < 0.001; ES: >5.1) GCT in all the walking conditions. A significant systematic positive bias (P < 0.022; r = 0.56-0.76) was found in 7 conditions.
The Stryd Power Meter appears to produce reliable measurements for power output, cadence and GCT. The Stryd produced valid measurements for cadence during walking on positive slopes and during level walking with a loaded backpack. However, the Stryd is not valid for measuring GCT during these walking conditions. This study adds novel data regarding the reliability and validity of this device and might be of particular interest for scientists, practitioners, and first responders seeking reliable devices to quantify gait mechanics during walking.
由于价格低廉且易于获得，Stryd 功率计在现场步态分析中受到了特别关注。然而，Stryd 在使用不同背包负载在正斜坡上行走时的可靠性和有效性从未被研究过。
Stryd 功率计在正斜坡行走和负重行走时，定量步态力学是否可靠和有效？
来自警察救援队的 17 名参与者在不同的正坡（1%、10%和 20%）和背包负载（0%、10%、20%、30%和 40%的体重）条件下，以 3.6km·h 的速度进行了 8 次 5 分钟的亚最大步行试验。使用了两个 Stryd 设备进行可靠性分析。对步态频率和地面接触时间（GCT）的有效性进行了分析，以与黄金标准设备（Optojump）进行对比。
Stryd 对功率、步态频率和 GCT 的可靠性测试表现出可接受的结果[平均偏差：<2.5%；效应量（ES）：<0.25；均数标准差：<1.7%；r：>0.76]。步态频率的有效性测量（平均偏差：<0.8%；ES：<0.07；r：>0.96；Lin's 一致性系数：0.96；平均绝对百分比误差：<1%）也被认为是可接受的。Stryd 在所有行走条件下都高估了 GCT（P<0.001；ES：>5.1）。在 7 种情况下发现了显著的系统正偏差（P<0.022；r=0.56-0.76）。
Stryd 功率计似乎可以为功率输出、步态频率和 GCT 提供可靠的测量结果。Stryd 在正斜坡行走和平地行走时负重时，为步态频率提供了有效的测量结果。然而，Stryd 并不适用于测量这些行走条件下的 GCT。本研究提供了关于该设备可靠性和有效性的新数据，可能对希望在行走时定量步态力学的科学家、从业者和急救人员特别感兴趣。
