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相关概念视频

Variability: Analysis01:11

Variability: Analysis

128
Measures of variability are statistical metrics that reveal the dispersion pattern within a dataset. They are pivotal in biostatistics, providing insights into the heterogeneity within health and biological data. Variability signifies the degree to which data points diverge from one another, helping researchers understand the potential range of values and associated uncertainty within the data.
The range is a simple measure of variability, indicating the difference between the highest and...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Coefficient of Correlation01:12

Coefficient of Correlation

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The correlation coefficient, r, developed by Karl Pearson in the early 1900s, is numerical and provides a measure of strength and direction of the linear association between the independent variable x and the dependent variable y.
If you suspect a linear relationship between x and y, then r can measure how strong the linear relationship is.
What the VALUE of r tells us:
The value of r is always between –1 and +1: –1 ≤ r ≤ 1.
The size of the correlation r indicates the...
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Variation01:19

Variation

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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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. 
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相关实验视频

Updated: Jun 10, 2025

Clinical Assessment of Spatiotemporal Gait Parameters in Patients and Older Adults
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脚步时间变化,规律性和长距离相关性的重复性.

Patrick Slattery1, Jon Wheat2, L Eduardo Cofré Lizama3

  • 1Sport, Performance, and Nutrition Research Group, School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Victoria 3083, Australia.

Gait & posture
|October 20, 2024
PubMed
概括

像DFA和SE这样的步态分析措施的可重复性在不同负载和速度下的士兵中是差到中等的. 尽管重复率很低,但临床上有意义的步态变化仍然可以检测到.

关键词:
货运车辆 - 货运车辆规律性 规律性 规律性可靠性 可靠性可靠性可重复性 可重复性一步一脚的步伐测试-重新测试 测试-重新测试可变性的变化.

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科学领域:

  • 生物力学 生物力学
  • 军事医学 军事医学
  • 步态分析 步态分析

背景情况:

  • 测量波动分析 (DFA) 和样本 (SE) 评估步行的复杂性和规律性.
  • 这些非线性测量对步行障碍敏感,显示了军事伤害风险识别的潜力.
  • 在军事背景下,DFA和SE的气象学属性需要建立.

研究的目的:

  • 为了确定DFA,SE的重复性,以及步行时间的线性步态变化度 (SD,CV).
  • 为了评估这些措施在不同的负载 (0kg,23kg) 和速度 (自选,5.5公里/小时) 条件下.
  • 确定步态分析的可靠性,以识别受伤风险的士兵.

主要方法:

  • 14名澳大利亚陆军学员在两周内接受了三次测试.
  • 参与者在不同的负载和速度条件下在仪器化跑步机上完成了行走试验.
  • 类内相关系数 (ICC 2.1) 评估了线性 (SD,CV) 和非线性 (DFA,SE) 步态测量的会话间重复性.

主要成果:

  • 对于标准偏差 (SD) (ICC:0.357-0.545) 和变化系数 (CV) (ICC:0.371-0.529) 观察到差到中等的重复性.
  • 抑止波动分析 (DFA) 显示重复性差至中等 (ICC:0.013-0.504).
  • 样本 (SE) 的重复性很差 (ICC:0.133-0.226).

结论:

  • 在不同条件下的士兵的步态分析中,DFA,SE,SD和CV的重复性是有限的.
  • 尽管重复性很低,但检测临床上显著的步态变化的潜力仍然存在.
  • 需要进一步的研究来完善用于军事应用的步态分析协议.