Additional approaches include using behavioral modification techniques, such as physical exercise and exposure to an enriching environment, that are known to stimulate proliferation of stem cells.

其他的方法还包括已有的行为修饰技术刺激干细胞的增值，例如物理练习和环境暴露。

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Other triggers can include cold air, extreme emotional arousal such as anger or fear, and physical exercise.

其他诱因可能包括冷空气、愤怒或恐惧等极端情绪激发以及体育锻炼。

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At each visit volunteers will be monitored as they undertake a series of physical activities such as light stepping exercise.

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Later in life, factors such as higher education, income and mental and physical exercise could play a part, she said.

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