在8-13岁儿童中确定Move4加速度计的切线点
Franziska Beck1, Isabel Marzi2, Alina Eisenreich3
1Department of Sport Science and Sport, Friedrich-Alexander-Universität Erlangen-Nürnberg, Gebbertstraße 123b, 91058, Erlangen, Germany. franzi.beck@fau.de.
BMC sports science, medicine & rehabilitation
|November 29, 2023
概括
这项研究对8至13岁儿童的Move4加速度计进行了校准,确定了身体活动水平的切断点. 传感器位置对结果产生影响,需要仔细选择研究准确性.
科学领域:
- 生物医学工程 生物医学工程
- 儿科运动科学 儿科运动科学
- 可穿戴技术可穿戴技术
背景情况:
- 对体力活动 (PA) 的客观评估需要经过验证的加速度计.
- 儿童和成年人的运动方式不同,因此需要根据年龄进行特定的校准.
- 对于8-13岁的儿童,Move4加速度计需要验证.
研究的目的:
- 为8-13岁儿童校准和验证Move4加速计.
- 使用加速度计指标,确定不同体力活动强度的截止点.
- 评估传感器位置对测量准确性的影响.
主要方法:
- 53名儿童 (8-13岁) 在四个身体位置 (大腿,部,手腕,胸部) 佩戴Move4传感器.
- 参与者完成了四个强度级别的九项活动 (从久坐到充满活力的).
- 使用了平均幅度偏差 (MAD) 和运动加速强度 (MAI) 度量,通过心率验证,并通过分类和回归树 (CART) 确定截止点.
主要成果:
- 加速度计指标 (MAD/MAI) 在活动强度和身体位置上显示了不同的值.
- 在加速指标和心率之间发现了强烈的相关性 (MAD:0.595,MAI:0.611,p<0.01).
- 对于每一个传感器位置,确定了静止行为-轻度PA,轻度PA-中度PA和中度PA-强度PA的具体切断点.
结论:
- 这项研究提供了第一个研究加速仪切断点的儿童使用原始的MAD/MAI指标在四个传感器位置.
- 对所有测试的传感器位置观察到良好的灵敏度和特异性.
- 传感器位置的选择至关重要,并且由于不同的指标值,应与具体的研究问题保持一致.
相关概念视频
01:12Average Velocity
To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...
01:24Absolute Motion Analysis- General Plane Motion
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
01:24Relative Motion Analysis - Velocity
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
01:10Relative Motion Analysis - Acceleration
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
01:18Velocity of an Object
Understanding how an object moves along a path requires distinguishing between motion over a time span and motion at a precise moment. A useful example is a vehicle traveling along a straight and level path, where its position at any given time is known. The initial step in analyzing this motion is to measure how far the vehicle travels over a fixed time period. This measurement, called average velocity, is computed by dividing the total change in position by the duration over which the change...
01:29Evaluating Limits by Direct Substitution
In the analysis of functions that represent continuous physical phenomena, it is often necessary to determine the output value as the input approaches a specific point. When a combination of algebraic terms defines the function and exhibits no discontinuities or abrupt changes near the point of interest, the limit of the function can be evaluated directly. This process, known as direct substitution, involves replacing the variable in the expression with the value it approaches.Direct...