Journal of Korean Academy of Nursing

Research Paper

Influences of Autonomic Function, Salivary Cortisol and Physical Activity on Cognitive Functions in Institutionalized Older Adults with Mild Cognitive Impairment: Based on Neurovisceral Integration Model: Suh, Minhee; J Korean Acad Nurs 2021;51(3):294-304. Published online June 30, 2021; DOI: https://doi.org/10.4040/jkan.20282

Purpose
This study aimed to investigate objectively measured physical activity (PA) in institutionalized older adults with mild cognitive impairment (MCI) and to elucidate the influence of autonomic nervous function, salivary cortisol, and PA on cognitive functions based on neurovisceral integration model.
Methods
Overall cognitive function was evaluated using the mini-mental state examination (MMSE) and executive function was evaluated using semantic verbal fluency test and clock drawing test. Actigraph for PA, HRV and sAA for autonomous function, and the geriatric depression scale for depression were used. Saliva specimens were collected in the morning for sAA and cortisol.
Results
Ninety-eight older adults from four regional geriatric hospitals participated in the study. They took 4,499 steps per day on average. They spent 753.93 minutes and 23.12 minutes on average in sedentary and moderate-to-vigorous activity, respectively. In the multiple regression analysis, lower salivary cortisol level (β = - .33, p = .041) and greater step counts (β = .37, p = .029) significantly improved MMSE score. Greater step count (β = .27, p = .016) also exerted a significant influence on verbal fluency, and greater sAA (β = .35, p = .026) was significantly associated with a better clock drawing test result.
Conclusion
Salivary cortisol, sAA and physical activity were significantly associated with cognitive functions. To prevent older adults from developing dementia, strategies are needed to increase their overall PA amount by decreasing sedentary time and to decrease salivary cortisol for cognitive function, and to maintain their sympathetic nervous activity for executive function.

Citations

Citations to this article as recorded by

Rest-activity circadian rhythm in hospitalized older adults with mild cognitive impairment in Korea and its relationship with salivary alpha amylase: an exploratory study
Minhee Suh, Jihye Choi
Journal of Korean Biological Nursing Science.2023; 25(4): 306. CrossRef
Circadian Rhythm Changes in Healthy Aging and Mild Cognitive Impairment
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Advanced Biology.2023;[Epub] CrossRef
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Frontiers in Physiology.2023;[Epub] CrossRef

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