当你睡觉的时候，身体会产生一种人体生长激素(HgH)，它不仅促进肌肉生长，还刺激你的骨髓，而免疫细胞正是在这里产生的。

When you sleep, your body produces human growth hormone (HgH), which not only builds muscle, but also stimulates your bone marrow, where immune cells are created.

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研究人员发现了一些人已经发生了极少量的基因变异，这种变异减少了细胞对某种生长激素（即，胰岛素样生长因子1（IGF1)）的使用。

Researchers have discovered that some people have a rare genetic mutation that decreases their cells' use of a particular growth hormone: insulin-like growth factor 1 (IGF1).

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人体生长激素能促进身体健康成长，细胞修复和再生，这对肌肉的发育是非常有必要的。

HGH stimulates healthy growth, cell repair and the regeneration which is necessary for muscle development.

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