AUTHOR=Huang Jian , Wang Xinping , Zhu Hao , Huang Dong , Li Weiwang , Wang Jing , Liu Zhirong 

TITLE=Association between grip strength and cognitive impairment in older American adults

JOURNAL=Frontiers in Molecular Neuroscience

VOLUME=Volume 15 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2022.973700

DOI=10.3389/fnmol.2022.973700

ISSN=1662-5099

ABSTRACT=Abstract  
Background and Aims: Exponential population ageing has led to increased prevalence of cognitive impairment worldwide. Hand grip strength, which may associate with physical activity may be a useful predictor of cognitive impairment. However, few studies have reported the association, if any, between hand grip strength and cognitive function.
Methods: We used data obtained from the National Health and Nutrition Examination Survey between 2011–2012 and 2013–2014 to investigate the association between hand grip strength and cognitive impairment. Cognitive impairment was assessed using the Consortium to Establish a Registry for Alzheimer’s Disease (CERAD), Animal Fluency (AF), and Digit Symbol Substitution Test (DSST) scores. Cutoff values of CERAD<5, AF<14, and DSST<34 were used to defined cognitive impairment. In this cross-sectional study, we used odds ratios to determine the potential usefulness of hand grip strength for prediction of cognitive impairment.
Results: The study included 2623 participants aged ≥60 years. The DSST results showed that hand grip strength was associated with a low risk of cognitive impairment and that subgroup analysis showed that male sex, age 60–69 years, and the NH (NH) White, NH Black, and Asian was associated with a significantly low risk of cognitive impairment. The CERAD test results showed that age 70–79 years and the NH White was significantly associated with a low risk of cognitive impairment. Following full adjustment, we did not observe statistically significant differences between hand grip strength and cognitive impairment based on CERAD test. The AF test results showed that age >80 years, female sex, and the NH White was associated with a significantly low risk of cognitive impairment. The most important finding is that a linear association between grip strength and cognitive impairment, as well as a sex-based linear association. Machine learning of the XGBoost model suggests that grip strength is one of the top two importance negative predicator variables.
Conclusions: We observed an inverse relationship between hand grip strength and cognitive impairment, which might suggests a shared underlie mechanism that needs to be further investigated using a large-scale prospective clinical trial to validate our findings.