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Associations between physical activity and cognitive functioning among middle-aged and older adults

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The journal of nutrition, health & aging

Abstract

Objectives

To describe aerobic physical activity among middle-aged and older adults by their selfreported cognitive decline and their receipt of informal care for declines in cognitive functioning and most common type of physical activity.

Design

Cross-sectional study using data from the 2011 Behavioral Risk Factor Surveillance System.

Setting

Landline and cellular telephone survey.

Participants

93,082 respondents aged 45 years and older from 21 US states in 2011.

Measurements

Subjective cognitive decline (SCD) was defined as experiencing confusion or memory loss that was happening more often or getting worse during the past 12 months. Regular care was defined as always, usually, or sometimes receiving care from family or friends because of SCD. Using the 2008 Physical Activity Guidelines for Americans, respondents were classified as being inactive, insufficiently active, or sufficiently active based on their reported aerobic exercise. We calculated weighted proportions and used chi-square tests for differences across categories by SCD status and receipt of care. We estimated the prevalence ratio (PR) for being inactive, insufficiently active, and sufficiently active using separate log-binomial regression models, adjusting for covariates.

Results

12.3% of respondents reported SCD and 23.1% of those with SCD received regular care. 29.6% (95%CI: 28.9-30.4) of respondents without SCD were inactive compared to 37.1% (95%CI: 34.7-39.5) of those with SCD who did not receive regular care and 50.2% (95%CI: 45.2-55.1) of those with SCD who received regular care. 52.4% (95%CI: 51.6-53.2) of respondents without SCD were sufficiently active compared to 46.4% (95%CI: 43.8-49.0) of respondents with SCD and received no regular care and 30.6% (95%CI: 26.1-35.6) of respondents with SCD who received regular care. After adjusting for demographic and health status differences, people receiving regular care for SCD had a significantly lower prevalence of meeting aerobic guidelines compared to people without SCD (PR=0.80, 95%CI: 0.69-0.93, p=0.005). The most prevalent physical activity was walking for adults aged ≥ 45 years old (41-52%) regardless of SCD status or receipt of care.

Conclusion

Overall, the prevalence of inactivity was high, especially among people with SCD. These findings suggest a need to increase activity among middle-aged and older adults, particularly those with SCD who receive care. Examining ways to increase walking, potentially by involving informal caregivers, could be a promising way for people with SCD to reduce inactivity and gain the health benefits associated with meeting physical activity guidelines.

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Correspondence to Christina E. Miyawaki.

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Supplementary Table 1

List of categorized aerobic activities, metabolic equivalent (MET) values by activity, and number and weighted percent of respondents aged 45 years and older who reported each activity, by subjective cognitive decline (SCD) status and receipt of regular informal care for SCD†, Behavioral Risk Factor Surveillance System (BRFSS) 2011

Supplementary Table 2

Weighted percentage of respondents aged 45 years and older who met physical activity guidelines for aerobic activity and muscle strengthening activity by subjective cognitive decline (SCD) status and receipt of regular informal care for SCD†, Behavioral Risk Factor Surveillance System (BRFSS) 2011

Supplementary Table 3

Association between subjective cognitive decline (SCD) and receipt of care for SCD with being inactive, insufficiently active, and sufficiently active in adjusted weighted logistic regression models among adults aged 45 years and older, by BMI category*, Behavioral Risk Factor Surveillance System (BRFSS) 2011

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Miyawaki, C.E., Bouldin, E.D., Kumar, G.S. et al. Associations between physical activity and cognitive functioning among middle-aged and older adults. J Nutr Health Aging 21, 637–647 (2017). https://doi.org/10.1007/s12603-016-0835-6

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