1. Effects of long sleep time and irregular sleep–wake rhythm on cognitive function in older people
- Author
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Masato Okuda, Akiko Noda, Kunihiro Iwamoto, Honoka Nakashima, Kozue Takeda, Seiko Miyata, Fumihiko Yasuma, Norio Ozaki, and Akito Shimouchi
- Subjects
Medicine ,Science - Abstract
Abstract Sleep disturbances and cognitive decline are common in older adults. We aimed to investigate the effects of the total sleep time (TST) and sleep–wake rhythm on executive function and working memory in older adults. In 63 older participants, we measured the TST, wake after sleep onset (WASO), and sleep timing (midpoint between bedtime and wake-up time) using actigraphy. Executive function was evaluated with the trail making test B (TMT-B) and Wisconsin card sorting test (WCST). The number of back task (N-back task) was used to measure working memory. Participants with a TST ≥ 8 h had a significantly lower percentage of correct answers (% correct) on the 1-back task than those with a TST
- Published
- 2021
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