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相关概念视频

Average Acceleration01:30

Average Acceleration

The importance of understanding acceleration spans our day-to-day experiences, as well as the vast reaches of outer space and the tiny world of subatomic physics. In everyday conversation, to accelerate means to speed up. For instance, we are familiar with the acceleration of our car; the harder we apply our foot to the gas pedal, the faster we accelerate. The greater the acceleration, the greater the change in velocity over a given time. Acceleration is widely seen in experimental physics. In...
Gyroscope01:02

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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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Measuring Acceleration Due to Gravity

Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
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The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
Field Application of Global Positioning System01:28

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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
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Trajectory Data Analyses for Pedestrian Space-time Activity Study
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青少年的学前体育活动模式,使用加速度计和GPS数据.

James Woodforde1, Sjaan Gomersall2, Anna Timperio3

  • 1School of Human Movement and Nutrition Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia.

Health & place
|March 8, 2024
PubMed
概括

大多数青少年不符合体育活动指南. 学前活动,特别是远离家和学校的活动,对青少年的每日中度至强度体力活动 (MVPA) 有着显著的贡献.

关键词:
青少年 青少年 青少年在学前教育.相关联 相关联 相关联位置 位置 位置身体活动 身体活动

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科学领域:

  • 青少年健康 青少年健康
  • 身体活动研究 身体活动研究
  • 行为科学 行为科学

背景情况:

  • 青少年经常未能满足推的体育活动 (PA) 准则.
  • 在上学前的时间为体育活动干预提供了一个潜在的窗口.
  • 需要对学前阶段的体育活动模式进行上下文理解.

研究的目的:

  • 分析青少年在不同地点的学前体育活动 (PA) 水平.
  • 确定学前PA对日常活动和准则遵守的贡献.
  • 确定与特定地点学前PA相关的因素.

主要方法:

  • 使用加速仪和GPS数据对148名青少年 (平均年龄14.7岁) 进行横截面研究.
  • 在学前阶段 (上午6点到上学开始) 对体力活动强度和位置的客观测量.

主要成果:

  • 青少年平均累计9.7分钟的学前中度至强度体力活动 (MVPA).
  • 大多数学前MVPA发生在远离家园和学校的地点.
  • 学前PA的关键相关性包括分段持续时间,年龄,社会经济地位和自我效能.

结论:

  • 学前体力活动 (PA) 对青少年的日常中度至强度体力活动 (MVPA) 水平作出了有意义的贡献.
  • 干预策略应考虑青少年在学前最活跃的背景和地点.
  • 了解年龄和自我效能等相关因素,可以为有针对性的干预措施提供信息,以促进青少年PA.