从实验室到现场:在标准化运行过程中,惯性测量单位衍生的步态参数的有效性和可靠性
Elliot Webber1,2, Cédric Leduc1,2, Stacey Emmonds1
1Centre for Human Performance, Carnegie School of Sport, Leeds Beckett University, Leeds, UK.
Journal of sports sciences
|September 28, 2024
概括
一个可穿戴的惯性测量单元 (IMU) 准确地测量步行步骤时间,长度和频率. 然而,接触时间需要个别偏差校正才能进行可靠的运行分析.
科学领域:
- 生物力学 生物力学
- 体育科学 运动科学 运动科学
- 可穿戴技术可穿戴技术
背景情况:
- 时空步态参数对于性能分析至关重要.
- 惯性测量单元 (IMU) 为步态评估提供了一个便携式解决方案.
- 对基于IMU的步态分析与既定方法进行验证是必不可少的.
研究的目的:
- 为了评估胸部安置IMU的并发有效性,用于步态分析.
- 在实验室和现场设置中确定IMU衍生的步态参数的测试-重试可靠性.
- 评估运行速度和个体差异对IMU准确性的影响.
主要方法:
- 通过将IMU数据与不同速度 (3-7.5m/s) 的光学系统 (OptoJump Next) 进行比较来评估并发有效性.
- 测试重复测试可靠性是使用29名精英足球运动员的数据进行评估的,他们进行了重复运行.
- 使用混合效应建模来分析系统之间的协议和可靠性.
主要成果:
- 通过IMU测量的步骤时间与光学系统在不同速度和个体之间表现出强烈的一致 (<0.3%).
- 接触和飞行时间显示出速度和个体依赖的偏差 (高达40毫秒).
- 步骤时间,长度和频率表现出最高的可靠性 (CV 1.3-1.4%),尽管受运行速度的影响.
结论:
- 胸部放置的IMU提供了可靠的步骤时间,长度和运行频率测量.
- 接触时间测量需要针对个体的偏差校正才能准确使用.
- 建议最低跑步距离为40米,以确保足够的数据可用于可靠的步态分析.
相关概念视频
03:37Uncertainty in Measurement: Accuracy and Precision
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
01:19Testing a Claim about Standard Deviation
A complete procedure to test a claim about population standard deviation or population variance is explained here.
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...
The hypothesis testing for the claim of population standard deviation (or variance) requires the data and samples to be random and unbiased. The population distribution also must be normal. There is no specific requirement on the sample size as the estimation is based on the chi-square distribution.
As a first step, the hypothesis (null and alternative) concerning the claim about...
01:15Data Validation
Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
Key parameters for method validation include:
Key parameters for method validation include:
01:29Measures of Intelligence
Psychologists measure intelligence by using standardized tests that produce a score known as the intelligence quotient or IQ. To understand IQ tests, it's important to recognize the key principles behind their construction: validity, reliability, and standardization.
Validity refers to how well a test measures what it claims to measure. An intelligence test should accurately assess intelligence rather than another characteristic, like anxiety. Criterion validity is one way to evaluate this; it...
Validity refers to how well a test measures what it claims to measure. An intelligence test should accurately assess intelligence rather than another characteristic, like anxiety. Criterion validity is one way to evaluate this; it...