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Physical and Chemical Properties of Matter02:57

Physical and Chemical Properties of Matter

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The characteristics that enable us to distinguish one substance from another are called properties.
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Classifying Matter by Composition03:35

Classifying Matter by Composition

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or...
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Classifying Matter by State02:49

Classifying Matter by State

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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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The Atomic Theory of Matter02:59

The Atomic Theory of Matter

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The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
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What is Matter?01:13

What is Matter?

103.8K
The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of...
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States of Matter01:20

States of Matter

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Solids, liquids, and gases are the three states of matter commonly found on Earth. A solid is rigid and possesses a definite shape. A liquid flows and takes the shape of its container, except it forms a flat or slightly curved upper surface when acted upon by gravity. Both liquid and solid samples have volumes nearly independent of pressure. A gas takes both the shape and volume of its container.
Scientists have discovered a fourth state of matter, plasma, that occurs naturally in the interiors...
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Updated: Feb 12, 2026

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
08:45

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

601

テキストメッセージによる身体活動の促進：アドバイザーのパーソナライゼーションは重要か？

Michael F Royer1, Maria I Campero2, Dulce Garcia2

  • 1Stanford Prevention Research Center, Stanford University School of Medicine, Palo Alto, CA, USA.

American journal of health promotion : AJHP
|February 11, 2026
PubMed
まとめ

パーソナライズされたテキストメッセージアドバイザーは、高齢のラテン系成人における身体活動（PA）を有意に増加させた。非パーソナライズおよび性別選択メッセージングは、12ヶ月で最大の適度から活発な身体活動（MVPA）の増加を示した。

キーワード:
アドバイスラテン系パーソナライゼーション身体活動テキストメッセージ

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関連する実験動画

Last Updated: Feb 12, 2026

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科学分野:

  • 公衆衛生
  • 老年医学
  • デジタルヘルス

背景:

  • 身体活動（PA）は、中年および高齢者の健康にとって非常に重要である。
  • ラテン系成人は、特有の健康課題に直面している増加中の人口集団である。
  • デジタル介入は、PAを促進するためのスケーラブルなソリューションを提供する。

研究 の 目的:

  • 3つのSMSベースPAアドバイザーのパーソナライゼーション戦略の効果を比較すること。
  • 身体活動が不十分な中年および高齢のラテン系成人における身体活動を促進すること。
  • 多様な集団に最適なデジタルメッセージングアプローチを特定すること。

主な方法:

  • ランダム化比較試験内試験（SWAT）デザイン。
  • 141人の参加者がSMSベースのPAコーチングを受けた。
  • 非パーソナライズ、性別一致、または性別選択アドバイザーの条件にランダムに割り当てられた。
  • CHAMPS instrumentを使用してPAを12ヶ月間評価した。

主要な成果:

  • すべてのSMS条件で12ヶ月間にPAを有意に増加させた。
  • 非パーソナライズおよび性別選択アドバイザーは、性別一致よりもMVPAの増加が大きかった。
  • 性別特異的分析では、非パーソナライズおよび性別選択の両方の条件で男性のMVPAが増加した。
  • 女性については、性別一致よりも有意にMVPAが増加したのは非パーソナライズ条件のみであった。

結論:

  • 非パーソナライズおよび性別選択SMSアドバイザーは、この集団におけるMVPAを増加させるのに効果的である。
  • デジタルメッセージングを参加者の好みに合わせて調整することで、介入の効果を高めることができる。
  • この結果は、資源の少ないコミュニティにおけるデジタルPA介入のスケーラビリティを支持する。