University of Groningen, University Medical Center Groningen, Department of Rehabilitation Medicine, Groningen, the Netherlands; University of Tehran, Faculty of Physical Education and Sport Sciences, Department of Health and Sport Medicine, Tehran, Iran.
University of Groningen, University Medical Center Groningen, Department of Rehabilitation Medicine, Groningen, the Netherlands.
Phys Ther Sport. 2020 May;43:27-35. doi: 10.1016/j.ptsp.2020.02.003. Epub 2020 Feb 8.
To investigate the validity and reliability of a smartphone application for selected lower-limb kinematics during treadmill running.
Validity and reliability study.
Biomechanics laboratory.
Twenty healthy female runners.
MAIN OUTCOME MEASURE(S): Sagittal-plane hip, knee, and ankle angle and rearfoot eversion were assessed using the Coach's Eye Smartphone application and a 3D motion capture system. Paired t-test and intraclass correlation coefficients (ICC) established criterion validity of Coach's Eye; ICC determined test-retest and intrarater/interrater reliability. Standard error of measurement (SEM) and minimal detectable change (MDC) were also reported.
Significant differences were found between Coach's Eye and 3D measurements for ankle angle at touchdown and knee angle at toe-off (p < 0.05). ICCs for validity of Coach's Eye were excellent for rearfoot eversion at touchdown (ICC = 0.79) and fair-to-good for the other kinematics (range 0.51-0.74), except for hip at touchdown, which was poor (ICC = 0.36). Test-retest (range 0.80-0.92), intrarater (range 0.95-0.99) and interrater (range 0.87-0.94) ICC results were excellent for all selected kinematics.
Coach's Eye can be used as a surrogate for 3D measures of knee and rearfoot in/eversion at touchdown, and hip, ankle, and rearfoot in/eversion at toe-off, but not for hip and ankle at touchdown or knee at toe-off. Reliable running kinematics were obtained using Coach's Eye, making it suitable for repeated measures.
研究一种用于跑步机跑步时下肢运动学的智能手机应用的有效性和可靠性。
有效性和可靠性研究。
生物力学实验室。
20 名健康的女性跑步者。
矢状面髋关节、膝关节和踝关节角度以及后足外翻使用 Coach's Eye 智能手机应用程序和 3D 运动捕捉系统进行评估。配对 t 检验和组内相关系数（ICC）确定了 Coach's Eye 的标准效度；ICC 确定了测试-重测和组内/组间可靠性。还报告了测量误差（SEM）和最小可检测变化（MDC）。
在着地时的踝关节角度和离地时的膝关节角度方面，Coach's Eye 与 3D 测量值之间存在显著差异（p<0.05）。Coach's Eye 的有效性的 ICC 对于着地时的后足外翻非常好（ICC=0.79），对于其他运动学的 ICC 为良好到中等（范围为 0.51-0.74），除了着地时的髋关节，其 ICC 为差（ICC=0.36）。测试-重测（范围为 0.80-0.92）、组内（范围为 0.95-0.99）和组间（范围为 0.87-0.94）ICC 结果对于所有选定的运动学都是优秀的。
Coach's Eye 可用于替代 3D 测量在着地时的膝关节和后足内外翻，以及在离地时的髋关节、踝关节和后足内外翻，但不能用于在着地时的髋关节和踝关节或在离地时的膝关节。使用 Coach's Eye 获得了可靠的跑步运动学数据，使其适合重复测量。
