Association Between Physical Function and Neighborhood Environment in Healthy, Older Adults: An Exploratory Study Using Regression Tree Analysis

The mediating role of step counts in the relationship between diverse neighbourhood destinations and older adults' physical function

Research has shown that access to activity-supportive neighbourhood destinations is associated with physical activity levels and physical functioning in older adults. However, the relative importance of different destinations and the mechanisms underlying these relationships remain unclear. We investigated (i) the relationships between the availability of diverse neighbourhood destinations and physical functioning in Taiwanese older adults and (ii) whether step counts mediated these relationships. Data were analysed from 206 participants aged 65 years or above, recruited from geriatrics outpatient clinics or check-up services at a medical centre in Taipei, Taiwan. Geographic information system technology was used to assess the availability of utilitarian destinations, public transport stations, parks, schools, and sports facilities based on geocoded addresses. Physical functioning was evaluated through on-site examinations. Logistic and linear regression models were used to investigate the relationships and joint-significance tests were used to examine mediation effects. The participants (52.4% women) were generally healthy, with no severe comorbidities, good cognitive function, and a low risk of depression. Adjusted models showed that greater park availability was associated with better physical functioning, including upper and lower limb strength and mobility. The relationship appeared to be partially mediated by increased step counts. Some evidence suggested that walking steps also mediated the relationship between the availability of public transport stations and physical functioning. However, no direct relationhips were found between public transport station availability and physical functioning, suggesting potential offseting factors. These findings suggest strategic allocation of neighbourhood resources, such as parks, to promote walking behaviour and enhance physical functioning in older adults. Future research should explore park design, usage patterns, and other potential mediators related to public transport stations to refine strategies for maintaining and improving physical functioning in ageing populations.

Associations between the urban neighbourhood built and social environment characteristics with physical functioning among mid- and older-aged adults: A systematic review

There is growing recognition of the association between neighbourhood factors and individuals' health. This systematic review examines the associations between urban neighbourhood built and social environment characteristics with different measures of physical functioning among mid- and older-aged adults over 45 years, focusing on cross-sectional and longitudinal study designs. It responds to the increase in publications on this topic following the COVID-19 pandemic. The systematic review included 25 studies written in English from 2018 onwards sourced from 8 databases. Studies were imported into Covidence and reviewed following the 'Preferred Reporting Items for Systematic Reviews and Meta-Analysis' (PRISMA) protocols. Findings were assessed according to 13 neighbourhood environment variables: aesthetics, crime safety, greenness and parks, land use mix and destinations, neighbourhood disadvantage, pedestrian/street infrastructure, public transport, residential density, social environment, street connectivity, traffic safety, walkability, and composite variables. Significant associations in the expected direction were found for land use mix and destinations, walkability, crime safety, greenness and parks, social environment, and neighbourhood disadvantage with physical functioning in mid- and older-aged adults. Weaker evidence of expected associations was found for residential density and aesthetics. Future research avenues on this topic include investigating built and social neighbourhood environments in diverse geographies and populations, considering housing status and length of exposure to the neighbourhood environment, using longitudinal surveys over longer time periods and objective measurements.

An in-person survey of the influence of the COVID-19 pandemic on physical function, functional capacity, cognitive function, and mental health among community-dwelling older adults in Japan from 2016 to 2022

BACKGROUND

The COVID-19 outbreak might have had several effects on older adults; however, much of the previous research only included self-report, cross-sectional, and online-survey data in the early stage of the pandemic. We conducted a face-to-face survey before and after the COVID-19 pandemic and investigated the influence of the pandemic on several functions to distinguish between changes due to aging and changes due to the pandemic using a linear mixed model.

METHODS

A total of 8 longitudinal surveys were conducted from 2016 to 2022. Physical function was assessed by weight, body mass index, body fat percentage, skeletal muscle mass index, calf circumference, grip strength, knee extension strength, the 5-times chair stand test, the timed up & go test and 5-m walking test. Functional capacity was measured using the Tokyo Metropolitan Institute of Gerontology index of competence, cognitive function was measured using the Trail Making Test - A, and mental health was measured using the Geriatric Depression Scale.

RESULTS

Of a total of 73 participants, 51 (69.9%) were female. The mean age at first participation was 71.82 years (SD = 4.64). The results of the linear mixed model showed that lower-limb muscle strength and body fat percentage and cognitive function changed significantly before and after the pandemic, while grip strength, functional capacity, and mental health did not.

CONCLUSIONS

The changes in these functions between before and after the pandemic might be attributed to the diminished opportunities for the independent older individuals to go out and engage in activities. Although functional capacity did not change, lower-limb muscle strength is important for functional independence. This decline might influence the functional capacity of these individuals in the future.

The Effects of Neighborhood Physical and Social Environment on Physical Function among Japanese Community-Dwelling Older Adults: A One-Year Longitudinal Study

Previous studies have shown a relationship between physical and social aspects of the neighborhood environment (e.g., built environment, safety) and physical function in older adults. However, these associations are unclear in older Asian adults because longitudinal studies are lacking. This study examined the effects of neighborhood physical and social environment on longitudinal changes in physical function among Japanese older adults. We analyzed 299 Japanese community-dwelling adults aged ≥65 years. Neighborhood environment was assessed using the International Physical Activity Questionnaire Environment Module. Physical function was assessed using handgrip strength, knee extension muscle strength, 5-m walking time, and a timed up-and-go test (TUG) in baseline and follow-up surveys. Changes in physical function over one year were calculated and classified into decline or maintenance groups based on minimal detectable changes. Multiple logistic regression analysis showed that even after adjusting for confounding factors, good access to recreational facilities affected the maintenance of 5-m walking time (odds ratio [OR] = 2.31, 95% confidence interval [CI]: 1.02–5.21) and good crime safety affected the maintenance of TUG (OR = 1.87, 95%CI: 1.06–3.33). Therefore, it is important to assess both physical and social environmental neighborhood resources in predicting decline in physical function among Japanese older adults.