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  3. Earlier studies have tied chronic sleep disorders and low levels of sleep to greater risks of heart disease and obesity, and eve

Earlier studies have tied chronic sleep disorders and low levels of sleep to greater risks of heart disease and obesity, and eve

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问题     Earlier studies have tied chronic sleep disorders and low levels of sleep to greater risks of heart disease and obesity, and even【B1】_____life span. But the new study, published in the journal Hypertension, is one of the first to find that it’s not just how much you sleep, but the【B2】_____of your nightly slumber that can affect your risk for high blood pressure. The goal of the study,【B3】_____by researchers at Harvard Medical School and elsewhere, was to look specifically at the slow-wave stages of sleep, which【B4】_____about 90 minutes to two hours of a normal night’s rest and【B5】_____the deepest hours of sleep. To study the effect of deep sleep on health, the scientists followed 784 healthy men who were part of an【B6】_____sleep study and did not have signs of high blood pressure at the start of the research. During the three-and-a-half year study, the men had their blood pressure checked at various times, and their levels of slow-wave sleep were 【B7】_____at home by a machine. After controlling for a number of【B8】_____, the researchers found that the men who spent the least time in slow-wave or deep sleep were the most likely to develop high blood pressure. Although a night of normal sleep should【B9】______about 25 percent slow-wave sleep, the men in the study who were at highest risk for hypertension managed to enjoy deep sleep for no more than 4 percent of their total sleep each night. The researchers found that the men with the least deep sleep were more likely to have sleep apnea and【B10】______sleep less over all.
【B8】
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答案variables
解析 根据空格所在位置可知，空格处应填入名词(词组)。结合录音可填入variables，意为“可变因素”。
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