体力活动（Physical Activity，PA）的概念很广，并且易与其它概念混淆。已经被普遍接受的是Caspersen等人的定义：“任何由骨骼肌收缩引起的导致能量消耗的身体运动”。
网络释义专业释义
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physical activity - 引用次数：83
There were 4 pregnant women who had never joined in anymoderate physical activity during pregnancy.
有4人孕期未从事任何中度及以上体力活动。
参考来源 - 孕期体力活动对妊娠结局和婴儿生长发育影响的研究 -
physical activity - 引用次数：12
The dose-response relationship between physical activity level and health has been proven, so the measurements of physical activity are concerned by researcher.
体力活动水平与健康之间存在着剂量反应，如何准确测量体力活动水平是研究人员关心的问题。
参考来源 - 体力活动测量方法研究进展—《体育与科学》—2008年第6期—龙源期刊网
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双语例句原声例句
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在一次艰苦的锻炼或一整天体力活动后，肌肉酸痛是很常见的。
After a tough workout or a day full of physical activity, it's common to find your muscles aching.
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我应该维持何种程度的体力活动？
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考虑下游览、娱乐或其他体力活动。
Consider making pleasure trips or participating in entertainment that will require energy.
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It used to be a lot easier to be physically active then it is today, and we'll discuss this later in the class, but energy saving devices all over the place.
在过去,人们比现在从事更多的体力活动,这一点我们以后再讲,帮助你省力的装置,如今随处可见
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