Introduction
Well-being, while often equated to a single construct, is multifaceted.1 A more complete picture considers both subjective and eudaimonic well-being.2 How one evaluates their life (ie, life satisfaction) and their emotional experiences (ie, positive and negative affect) is conceptualised as subjective well-being,3 while broader aspects of ‘doing well’, such as life purpose, reflect eudaimonic well-being.2
Holistically, positive well-being has been linked to numerous health benefits, including decreased mortality risk,4 improved productivity and social behaviour4 and reduced odds of future depression.5 Indeed, people desire greater well-being, willing to trade-off income and career success for increased well-being.6 However, many factors influence overall well-being, such as age and physical activity (PA). For instance, low life satisfaction and high worry accompanies middle adulthood, with these improving into older age.3 Physical activity appears positively related to evaluative well-being (eg, life satisfaction) and positive affect (eg, happiness), but not negative affect (eg, stress).7 8 In addition to well-being directly, PA is positively related to how one perceives their overall health (self-rated health),9 which in turn has been identified to influence well-being.10
One’s sex also impacts well-being, as men report lower life satisfaction11 and purpose in life12 compared with women. In addition, men are less likely to seek physical and mental health support and use preventative health services compared with women.13 14 Despite this lack of help-seeking, PA has shown promise to engage men in health promotion,15 and thus is an important tool to promote well-being in men.
While PA may be beneficial for the health and well-being of men, we do not know which type of PA is best. As Ekkekakis and Backhouse discuss,16 individuals do not partake in PA in a vacuum, and therefore it is important to contextualise PA. Few studies have compared the effect of PA type on well-being outcomes. There is some evidence however that different types of PA are related differently to mental health,17 well-being18 19 and self-rated health.19 For example, Kekalainen et al19 identified walking in nature, but not other exercise modes assessed, to positively relate to the subjective well-being of 50-year-old men. Further, Werneck et al18 identified participation in team sport or jogging/running, but not other types of leisure-time PA, to be associated with higher future mental well-being among middle-aged men. Despite some evidence of differential effects, prior literature has either clustered PA types (eg, by combining group fitness and team sport) that may have different influences on men’s health and well-being19 or consisted of small sample sizes with limited types of activity examined.20
Evaluating and comparing different PA types can be challenging, as individuals seldom participate in only one type of PA. While traditional single effects models offer insights into the relationship between increased time spent in a specific PA type and the health outcome of interest, they can overlook the potential influence of concurrent participation in other PA types. It is important to consider that increasing time spent in one physical behaviour needs to come at the expense of time spent engaged in another behaviour, and therefore modelling to assess how such substitutions can influence health is becoming common.21 Isotemporal substitution modelling explores the associations between time spent doing one behaviour and replacing it with another, while holding total time constant.22 As this statistical approach provides some insight into the superiority of a particular behaviour compared with another on the outcome of interest, its application to assessing time spent in different types of PA is of interest. For instance, the seminal work from Mekary et al22 revealed distinct associations between substituting different intensities of walking and jogging/running with weight gain in premenopausal women. More recently, Ortola et al23 identified that substituting time spent doing physically active housework or gardening with walking or cycling and sports was associated with healthier ageing in older adults, whereas substituting walking with cycling and playing sports was not.23 To our knowledge, no other studies have used isotemporal substitution with a wider variety of PA types to evaluate influences on the well-being of middle-aged and older men.
Therefore, the present study examined how changing time spent doing different types of PA could influence subjective and eudaimonic well-being, as well as self-rated health, in middle-aged and older men.