A published report says the genetic changes could be linked to stress levels during this method of giving birth.

VOA: special.2009.11.24

And if we lower our expectations, we lower our stress levels and we will enjoy life more.

如果能降低期望，降低压力水平，我们会更享受生活。

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As a result,those babies can have higher stress levels than those born without the help of the operation.

VOA: special.2009.11.24

High stress levels have been found to cause asthma attacks that make it difficult to breathe.

VOA: special.2009.03.24

Talking leads to the release of the brain hormone oxytocin, which lowers her stress levels.

VOA: special.2009.03.24

The study found that stress levels dropped sharply after people reached their fifties.

VOA: special.2010.08.03

His team found that levels of stress were highest among adults between the ages of twenty-two and twenty-five.

VOA: special.2010.08.03

Mister Gray says studies have linked a rise in testosterone levels to reduced stress in men.

VOA: special.2009.03.24

Studies also show that chronic stress reduces the levels of the hormone estrogen in women.

VOA: special.2009.03.24

The device might also reduce stress because patients will know if their fluids are at the right levels.

VOA: standard.2010.06.04