Institute of Interdisciplinary Exercise Science and Sports Medicine, Faculty of Medicine, MSH Medical School Hamburg, 20457 Hamburg, Germany.
Institute of Biomechanics and Orthopedics, German Sport University Cologne, 50933 Cologne, Germany.
Sensors (Basel). 2022 Dec 29;23(1):347. doi: 10.3390/s23010347.
Running stability is the ability to withstand naturally occurring minor perturbations during running. It is susceptible to external and internal running conditions such as footwear or fatigue. However, both its reliable measurability and the extent to which laboratory measurements reflect outdoor running remain unclear. This study aimed to evaluate the intra- and inter-day reliability of the running stability as well as the comparability of different laboratory and outdoor conditions. Competitive runners completed runs on a motorized treadmill in a research laboratory and overground both indoors and outdoors. Running stability was determined as the maximum short-term divergence exponent from the raw gyroscope signals of wearable sensors mounted to four different body locations (sternum, sacrum, tibia, and foot). Sacrum sensor measurements demonstrated the highest reliabilities (good to excellent; ICC = 0.85 to 0.91), while those of the tibia measurements showed the lowest (moderate to good; ICC = 0.55 to 0.89). Treadmill measurements depicted systematically lower values than both overground conditions for all sensor locations (relative bias = -9.8% to -2.9%). The two overground conditions, however, showed high agreement (relative bias = -0.3% to 0.5%; relative limits of agreement = 9.2% to 15.4%). Our results imply moderate to excellent reliability for both overground and treadmill running, which is the foundation of further research on running stability.
跑步稳定性是指在跑步过程中能承受自然发生的小干扰的能力。它易受外部和内部跑步条件的影响，如鞋类或疲劳。然而，其可靠的可测量性以及实验室测量与户外跑步之间的关联程度仍不清楚。本研究旨在评估跑步稳定性的日内和日间可靠性，以及不同实验室和户外条件的可比性。竞技跑步者在研究实验室的电动跑步机上和室内外的地面上完成跑步。跑步稳定性是通过安装在四个不同身体部位（胸骨、骶骨、胫骨和脚）的可穿戴传感器的原始陀螺仪信号的最大短期发散指数来确定的。骶骨传感器测量的可靠性最高（良好到优秀；ICC = 0.85 到 0.91），而胫骨测量的可靠性最低（中等到良好；ICC = 0.55 到 0.89）。对于所有传感器位置，跑步机测量值都系统地低于地面测量值（相对偏差=-9.8% 到-2.9%）。然而，这两种地面条件之间显示出高度的一致性（相对偏差=-0.3% 到 0.5%；相对界限=9.2% 到 15.4%）。我们的结果表明，无论是在户外还是在跑步机上跑步，都具有中等至优秀的可靠性，这是进一步研究跑步稳定性的基础。
