Stress Regulation as a Link between Executive Function and Pre-Frailty in Older Adults

Area of Science:

• Gerontology
• Neuroscience
• Psychology

Background:

• Pre-frailty and frailty are associated with diminished executive function (EF) in older adults.
• The underlying mechanisms connecting EF and pre-frailty remain unclear.
• Williams and colleagues' model suggests EF influences health via stress regulation.

Purpose of the Study:

• To investigate stress regulation as a mediator between executive function (EF) and pre-frailty in older adults.
• To test indicators of stress regulation, including perceived stress, heart rate reactivity/recovery, and serum interleukin-6/sleep quality, within the context of EF and pre-frailty.

Main Methods:

• Cross-sectional study involving 690 community-dwelling older adults aged 50 years and above.
• Pre-frailty assessed using a modified Fried Frailty measure.
• Executive function (EF) evaluated through telephone-based neurocognitive assessments; stress indicators measured via perceived stress, heart rate, serum interleukin-6, and sleep quality.

Main Results:

• Of 690 participants, 396 were non-frail and 277 were pre-frail.
• Pre-frail individuals were older, had poorer EF, higher stress exposure, and poorer stress restoration compared to non-frail individuals.
• Poorer EF correlated with increased stress exposure, less reactivity, longer recovery, and poorer restoration; stress exposure and restoration significantly mediated the EF-pre-frailty link.

Conclusions:

• Stress exposure and restoration appear to be significant mediators in the relationship between executive function (EF) and pre-frailty.
• Further longitudinal research is necessary to establish causality and explore stress regulation as an intervention target for preventing EF decline and pre-frailty.