研究发现，在年龄低于40岁的研究对象中，晚间平均睡眠工夫不超过5小时的腹部脂肪增加量高于6至7小时平均睡眠的研究对象。 Among participants younger than 40, the study found, those who said they slept for five hours or less each night gained more belly fat than those who averaged six or seven hours of sleep.
前者的内脏脂肪增加32%，在6至7小时之间的增加13%，不低于8小时的增加22%。 On average, short sleepers showed a 32 percent gain in visceral fat, versus a 13 percent gain among those who slept six or seven hours per night, and a 22 percent increase among men and women who got at least eight hours of sleep each night.
皮下脂肪变化情形类似。 A similar pattern was seen with superficial abdominal fat.
美国北卡罗来纳州韦克福雷斯特大学医学院研究负责人克里斯滕·G·海尔斯通表示，该研究证明了睡眠习惯能够影响人们的体重和健康状况。“睡眠对你的身体健康很重要--并不仅在白天劳累的时分才有效。”她说。 The findings, according to lead researcher Dr. Kristen G. Hairston, of Wake Forest University School of Medicine in Winston-Salem, North Carolina, support the belief that sleep habits affect weight, and health in general. "Sleep is an important part of your overall health - not just in whether you're tired during the day," she said.
关于睡眠工夫关乎腹部脂肪增加，有很多理论基础。 As for why sleep duration might affect abdominal-fat gain, there are several theories.
首先，睡眠工夫可能间接影响脂肪增加：睡眠少可能使人感到倦怠，导致日间无力锻炼身体;与睡眠工夫居中者相比，睡眠较多者花在运动上的工夫少一些，因而脂肪增加多一些。 There may be indirect effects; people who get too little sleep may be too tired during the day to exercise, while those who spend a lot of time in bed may spend less time being active, relative to people who sleep fewer hours.
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