Paper Type

Master's Thesis


Brooks College of Health

Degree Name

Master of Science in Health: Kinesiology (MSH)


Clinical & Applied Movement Sciences

NACO controlled Corporate Body

University of North Florida. Department of Clinical & Applied Movement Sciences

First Advisor

Dr. M. Ryan Richardson

Second Advisor

Dr. James R. Churilla

Third Advisor

Dr. Marcelo Bigliassi

Department Chair

Dr. Joel Beam

College Dean

Dr. Mei Zhao


Background: Examining the joint effects of cognitive function (CF) and sedentary time (ST) may provide insight into the complex mechanisms underlying mortality risk within older adults. This study examines the joint effects of CF and ST on mortality risk in older adults.

Methods: Sample included 2,230 older adults (≥ 60 years of age) participants in the 2011-2014 National Health and Nutrition Examination Survey. The Digit Symbol Substitution Test (DSST), Consortium to Establish a Registry for Alzheimer's Disease (CERAD) subtests, and Animal Fluency (AF) were used to assess CF. Average daily sitting and television time represented ST. Quartiles of CF and ST were combined for analysis.

Results: Significant (p < 0.05) increases in mortality risk for participants in the lowest quartile of CF and highest quartile of ST. A 2.8, 3.9, 2.8, and 2.5-fold increased risk for all-cause mortality for the DSST, CERAD-IL, CERAD-DL, and AF test, respectively, were observed. Our analysis also revealed a 3.8, 3.2, 3.5, and 2.7-fold increased risk for cardiovascular disease-related mortality for the DSST, CERAD-IL, CERAD-DL, and AF test, respectively

Conclusion: The combination of CF scores with ST has been shown to be strongly associated with increased risks of both all-cause and cardiovascular disease-related mortality.