The researchers identified 2,231 people with an average age of 49 who were free of dementia. At the beginning of the study, each participant had a psychological exam and assessments for memory and thinking skills. Their memory and thinking skills were tested again an average of eight years later.
研究人员确定了2231名受试者,他们平均年龄49岁,不患有痴呆症。研究初期,每位受试者都进行了心理测试以及记忆力和思维能力评估测试。平均8年后,研究员再一次对他们的记忆力和思维能力进行测试。
Participants also provided a blood sample, taken in the morning after a period of fasting. Researchers measured cortisol levels in the blood and then divided participants into low, middle and high groups. A total of 2,018 participants also had an MRI brain scan to measure brain volume, according to the study.
受试者还提供了禁食一段时间之后的血液样本。研究人员测量了血液中的皮质醇水平,而后将受试者分为低水平、中间水平和高水平群组。研究表示,共计2018位受试者进行了磁共振成像脑部扫描以测量脑容量。
After adjusting for age, sex, smoking, and body mass index, researchers found that people with high levels of cortisol had lower scores on tests of memory and thinking skills than those with normal levels of cortisol.
在调整年龄、性别、吸烟情况和身体质量指数之后,研究员发现:相比皮质醇水平正常的受试者,皮质醇水平高的受试者在记忆力和思维能力测试中的得分更低。
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