In 2018, South Korea (hereafter “Korea”) became an aging society. As of 2023, people aged 65 years or older (hereafter “older adults”) are approximately 18.4% of the total population (51,558,030). Korea is expected to become a super-aged society by 2025, with older adultsaccounting for 20.6% of the population [1].
Such a dramatic change in Korea's demographic structure has sparked greater interest in the healthy lives of older people. At the personal level, older adults’ health significantly impacts their quality of life and happiness. Healthy people can enjoy free and abundant leisure time without pain due to a healthy lifestyle. At the macro level, the health of older adults is closely related to national finances. According to the 2022 National Health Insurance Statistical Yearbook [2], the number of people aged 65 years and older covered by health insurance in 2022 rose to 8.75 million, accounting for 17.0% of the total population. Consequently, total medical expenses for older adults also increased 1.4 times that in 2018, reaching US$ 333.95 billion in 2022.
Physical activity is recommended for the health of older adults. Undoubtedly, regular exercise positively affects their health and effectively reduces the country’s medical costs [3]. However, two out of three Korean older adults do not comply with the World Health Organization’s aerobic physical activity guidelines, and four out of five do not adhere to the strength exercise guidelines [4, 27].
Older men's physical activity participation status is lower than that of their female counterparts. According to the 2023 Korea National Sports Participation Survey (KNSPS), 15.2% of older women do not participate in physical activities, while 17.6% of older men also do not participate, resulting in a high non-participation rate of about 2.6% [3]. By contrast, the proportion of older women actively participating in physical activities was 11.1%, approximately 5.4% higher than that of older men at 5.7%. Consequently, older men's physical activity is lower than their counterparts.
Examining the differences in physical activity levels between older men and women is essential because older adults’ aging and progression differ depending on sex. According to a study by Heo [5], men have poorer health on average than women. Specifically, aging becomes noticeable mainly around 50–55 years for men and 70–75 years for women, and men show faster aging than women until the age of 65 years [5]. In other words, because the aging characteristics of men and women differ depending on the stage of life, physical activity levels and factors affecting them should be analyzed differently [6, 7]. Recently, it has been argued that gender-specific strategies should be developed to increase physical activity participation rates [8]. Studying the aging characteristics of older people is to avoid viewing them as a single group. In other words, factors such as sex, age group, health status, and social stratification based on economic status must be considered.
Several studies have used Bronfenbrenner’s ecological model to multidimensionally analyze systems affecting physical activity in older adults [9, 10, 11, 12, 13, 14]. Bronfenbrenner’s ecological model assumes that human development is influenced by a series of interconnected environmental systems, ranging from the immediate surroundings (e.g., family and friends) to broad societal structures (e.g., culture) [14]. These systems include the microsystem, mesosystem, exosystem, and macrosystem, each influencing different levels of an individual’s growth and development. Microsystems include the individual’s most immediate relationships and environments. For example, older people’s family, friends, and neighbors are part of their microsystem, and the interaction with these people directly influences development. A mesosystem is an interaction between different microsystems, such as immediate family and school and/or work settings. The exosystem includes formal and informal social structures such as government policies, mass media, and community resources. For example, cuts to sports funding from local and central governments can affect older people’s exposure to sports and leisure enrichment. Macrosystems refer to the cultural ideologies, belief systems, and knowledge that affect human development [14]. For example, beliefs about gender roles establish norms and values that permeate an older man or woman’s participation in physical activity.
Previous studies have examined the physical activity of older people as a single group without distinguishing important characteristics such as gender, using Bronfenbrenner's ecological model, which can explain everything from personal to social domains. However, little research has been conducted to empirically analyze whether there are differences in ecological systems that affect physical activity between older men and women.
Therefore, this research aims to examine ecological systems influencing the physical activity of older males and females differently, drawing upon Bronfenbrenner’s ecological model. Following a short introduction, the research is divided into five sections. First, the paper provides a brief outline of Bronfenbrenner’s ecological model and reviews previous research that applied the model. Second, we outline the quantitative method used. Third, analyzing collected data, we look at the differences in ecological systems influencing physical activity between older men and women. Fourth, we discuss the analysis within the socio-cultural context, and finally, we offer a conclusion and considerations for future research.
Theoretical Framework: Bronfenbrenner's ecological model and physical activity of Older adults
Bronfenbrenner's ecological model explains how human development and behavior are influenced by interactions between systems, such as psychological, family, cultural, socioeconomic, and political domains, which ultimately shape our behavior, life decisions, and wellness over a lifetime. In other words, this model of human development connects disparate research fields to explain how individuals and the interplay of their environments contribute to their development [15, 16]. This model asserts that human development is an evolving complex reciprocal interaction frequently occurring over time between individuals, objects, and symbols in their environments. These environmental interactions are referred to as proximal processes, found when one learns new skills or performs complex tasks. Proximal processes aim to explain how individual characteristics and the immediate and distal environments in which the processes unfold result in desired or undesired developmental outcomes. For example, when individuals access and use technology to improve their health, they inevitably depend on the environmental context, such as WiFi accessibility and education or socioeconomic factors. However, they can be further influenced by age and level of computer self-efficacy [17].
Bronfenbrenner's ecological model's basis resides in environmental influences that put the individual at the innermost nested level and expand outward toward larger social systems of influence. The first level of influence involves microsystems. Microsystems include interpersonal interactions among family members, friends, teachers, and colleagues. The second level of influence, mesosystems, comprises the relationships and processes between two or more microsystems, such as interactions between home and school, peer groups and home, and work and home [15]. The next level of influence, exosystems, is the more extensive social system that comprises two or more settings, including direct and indirect components (e.g., politics, economics, and culture). The final level, macrosystems, consists of overarching cultural and subcultural characteristics that influence all other levels, such as belief systems, knowledge, resources, and lifestyle factors.
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Research that applies the ecological model in the context of sport illustrates how different systems in Bronfenbrenner's ecological model influence an individual’s participation in physical activities. For instance, a study by Zheng et al. [18] found that health inequality exists among older adults in China. More specifically, the lower the income and the worse the community-built environment, the worse the health. The community-built environment plays a vital role in the health of older adults. Moreover, the community-built environment influenced the health of older adults through the intermediary role of outdoor activities and social participation. Kim [9, 10] examined that barriers to physical activity among older people include chronic diseases, a lack of support from social significance such as family members, friends, and colleagues, a lack of sports facilities, and a lack of opportunities to participate in physical activities. These barriers can be categorized into different systems in the ecological model. Backonja et al. [19] asserted that participation in physical activity and intention to continue physical activity among older people involves a wide range of stakeholders: older adults and their families and friends, communities, health services agencies, and government agencies. These involved match the different systems in the ecological model: individual, microsystem, mesosystem, exosystem, and macrosystem. Individuals within each system and in other systems are interconnected. These connections can represent flows of information from local and/or central government agencies (exosystem and macrosystem) about how older adults (individuals) can participate in physical activity and how they create a social network of individuals (mesosystem and microsystem) who share information in choosing a different physical activity.
Bronfenbrenner's ecological model is well-suited to understand older adults' behaviors and attitudes toward participation in physical activities in a super-aging society like Korea. Understanding older people and environmental level factors, interactions, and limitations can guide researchers in designing applications that meet specific personal needs. The study provides a better understanding of ecological systems that affect the physical activity level of older adults by sex and, in turn, contributes to establishing policies on the health and welfare of older adults.