Aging affects sleep and sleep problems are common in older individuals. However, the relationship between objective and subjective tools for analysing sleep and psycho-geriatric variables have not been tested in institutionalised older individuals. This work analyses sleep quality by using actigraphy as an objective tool and validates the Athens and Oviedo sleep questionnaires in octogenarian elderly individuals as subjective scales of sleep perception. All patients wore an actigraph device for one week and then completed the Athens and Oviedo clinical sleep-evaluation questionnaires. Morning cortisol levels in blood plasma and saliva samples were also measured to assess the association between objective and reported sleep patterns. Age, gender, and psycho-geriatric evaluations, including Barthel, Tinetti, and Mini-Mental scale measurements were analysed as variables with the potential to confound the strength of any such associations. There was a significant inverse correlation between the number of awakenings and the time spent awake during night assessed by actigraphy and the total Oviedo questionnaire score, but no significant associations for the other parameters. The blood cortisol concentration appears to be a marker of insomnia related to sleep times of less than four hours and diagnosis of insomnia based on Athens scale and thus, represents a potential marker for sleep interventions.
Keywords: Actigraphy; Athens questionnaire; Cortisol; Elderly people; Oviedo questionnaire; Sleep.
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