2. 职称英语
  3. Earlier studies have tied chronic sleep disorders and low levels of sleep to

Earlier studies have tied chronic sleep disorders and low levels of sleep to

游客2023-08-20  43
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. [br] 【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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