Grip Strength and Cognitive Abilities: Associations in Old Age

Area of Science:

• Gerontology
• Neuroscience
• Public Health

Background:

• Physical functioning and cognitive abilities are crucial for well-being, particularly in older adults.
• Grip strength is a recognized indicator of overall vitality and may predict cognitive function.
• Limited longitudinal research exists on grip strength's specific impact on diverse cognitive abilities.

Purpose of the Study:

• To investigate the longitudinal relationship between grip strength and cognitive function over 20 years.
• To determine if grip strength predicts changes in specific cognitive abilities (verbal, spatial, processing speed, memory).
• To identify the age at which grip strength and cognitive abilities become stably associated.

Main Methods:

• Utilized data from the Swedish Adoption/Twin Study of Aging (n=708, ages 40-86 at baseline).
• Employed latent growth modeling over 6 waves of data spanning 20 years.
• Treated grip strength and cognitive traits as time-varying covariates to analyze their mutual influence.

Main Results:

• Grip strength demonstrated a significant longitudinal influence on the trajectory of cognitive function.
• The association between grip strength and changes in verbal ability, spatial ability, processing speed, and memory was evident after age 65.
• A stable connection between grip strength and cognitive abilities emerged around age 65.

Conclusions:

• Grip strength is a predictor of cognitive changes in later life, particularly after age 65.
• The findings suggest potential links to lifestyle shifts (e.g., retirement) or accelerated aging processes around this age.
• Maintaining physical strength may be important for preserving cognitive health in aging individuals.