Objective: The present study utilized a population-based sample investigating the following aims: (1) compare the longitudinal course of insomnia in middle-aged and older adults and (2) examine age-related differences on subjective complaint and objective performance in middle-aged and older adults based on the course of insomnia. Methods: 1657 middle-aged adults (48.16% male, mean age. = 55.35. ±. 4.03. years) and 405 older adults (48.40% male, mean age. = 70.13. ±. 3.88. years) from the Korean Genome and Epidemiology Study (KoGES) were classified into 4 groups - no insomnia (NI), single episode insomnia (SEI), remitted persistent insomnia (PI-R), and ongoing persistent insomnia (PI-O) based on their course of insomnia over 5 time points spaced two years apart. Their performance on the psychomotor vigilance task (PVT) and subjective daytime sleepiness were compared across different insomnia groups, and the results were compared between middle-aged adults and older adults. Results: Analysis of covariance indicated that subjective daytime sleepiness was significantly different across the insomnia groups in middle-aged adults based on insomnia group (P. = <. .0001), but, did not affect objective vigilance performance. In contrast, older adults displayed significantly different PVT response time, but not daytime sleepiness, based on insomnia group (P. = 0.03). Conclusion: Insomnia impacts psychomotor performance and subjective sleepiness differently, based on age group. There may be underlying processes associated with the aging that amplifies the impact of insomnia on vigilance performance, yet lessens perceived sleepiness in older adults.
Bibliographical noteFunding Information:
This study was supported by the Korean Center for Disease Control and Prevention and the Korean Ministry for Health and Welfare [Grant 2003-347-6111-221 , Grant 2004-E71001-00 , Grant 2005-E71001-00 , Grant 2006-E71005-00 , Grant 2007-E71001-00 , Grant 2008-E71001-00 , Grant 2009-E71002-00 , Grant 2010-E71001-00 , Grant 2011-E71004-0 , Grant 2012-E71005-00 ] and the National Research Foundation of Korea [ NRF-2012-S1A5BA01 ].
- Daytime performance
ASJC Scopus subject areas
- Clinical Psychology
- Psychiatry and Mental health