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Feasibility of the duration of actigraphy data to illustrate circadian rhythm among cognitively intact older people in nursing home: cosinor analysis

  • Ilknur DoluEmail author
  • Nursen O. Nahcivan
Original Article
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Abstract

Assessment of sleep is an important determinant of health. Moreover, sleep assessment is quite difficult in elderly people; getting consent for participation in the study, spending more time due to cognitive and communicative disruptions, having difficulties in accessing to individuals, and higher withdrawal rate of elderly people than adults occur as additional difficulties. The objective of the study was to determine whether 1-day measurement could be enough to determine the circadian rhythm of cognitively intact older adults in nursing home. A sample of the study consisted of individuals living in three nursing homes with similar environmental conditions and who were independent in daily living activities. The exclusion criteria were severe health problems, severe neurological and mental diseases, and severe hearing loss and cognitive impairment. Continuous actigraphy monitoring was performed in 52 older adults who met the sampling criteria over a 4-day period. Cycle mesor, amplitude, acrophase, and R2, calculated using 1 to 4 days of data and each day of data, were compared. For amplitude, acrophase and R2 parameters, there was no statistically significant difference between 4-day measurement and 1-day measurement (p > 0.05). However, for mesor parameter, there was no significant difference between 1-day, 2-day, and 3-day measurements, and differentiation was observed in 4-day measurements. A daily measurement could be used to determine the circadian rhythm of actigraphy in cognitively intact older adults in nursing home. However, further studies are required to better understand and support our findings.

Keywords

Circadian parameters Log transformed Activity count Method 
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Notes

Acknowledgements

The authors thank the older adults for participating in this study. The authors also thank Assist. Prof. Dr. Irmak Hurmeric Altunsoz for permitting the use of the actigraph.

Author contributions

All authors contributed to study design. ID contributed to data management and analysis. ID and NON contributed to drafting and preparing the manuscript for publication. All authors approved the final manuscript.

Compliance with ethical standards

Conflict of interest

None of the authors have any conflicts of interest to disclose.

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Copyright information

© Japanese Society of Sleep Research 2019

Authors and Affiliations

  1. 1.Health Science FacultyBartin University, Agdaci CampusBartinTurkey
  2. 2.Public Health Nursing Department, Florence Nightingale Nursing FacultyIstanbul University-CerrahpasaIstanbulTurkey

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