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MONDAY, Sept. 21, 2020 (HealthDay News) — There is an inverted U-shaped association between sleep duration and global cognitive decline, according to a study published online Sept. 21 in JAMA Network Open<\/i>.<\/p>\n
Yanjun Ma, from the Peking University First Hospital in Beijing, and colleagues examined the association between sleep duration and cognitive decline by a pooled analysis of two nationally representative cohorts. Data were obtained from waves 4 to 8 of the English Longitudinal Study of Ageing (9,254 individuals; \u226550 years) and waves 1 to 3 of the China Health and Retirement Longitudinal Study (10,811 individuals; \u226545 years).<\/p>\n
The researchers found that after adjustment for a number of covariates, during 100,000 person-years of follow-up, the global cognitive z-scores declined faster for individuals with four hours or less (pooled \u03b2 = \u22120.022) and 10 hours or more (pooled \u03b2 = \u22120.033) of sleep per night compared with the reference group (seven hours per night). There was also an inverted U-shaped association for sleep duration and global cognitive decline.<\/p>\n
“The inverted U-shaped association indicates that cognitive function should be monitored in middle-aged and older individuals with insufficient or excessive sleep duration. Future mechanism studies and intervention studies examining the association between sleep duration and cognitive decline are needed,” the authors write.<\/p>\n
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