Decline in physical activity often starts as early as age 7

Summary: The amount of physical activity children participate in starts to decline at age seven. The study reveals four-fifths of adolescents, and one-third of adults do not meet recommendations of physical activity.

Source: University of Jyväskylä

Overall physical activity starts to decline already around the age of school entry. While the proportion of physically inactive individuals rises with age there still are groups of people who manage to increase their physical activity level in adulthood and old age.

While the level of physical activity varies between individuals, it can also vary within individuals during the life course. A recent study, carried out in collaboration between the University of Jyväskylä and LIKES Research Centre for Physical Activity and Health, systematically reviewed scientific articles identifying distinct subgroups of physical activity and the factors related to these subgroups in the general population in different countries during different life phases.

The proportion of decreasingly active individuals was exceptionally high during childhood and adolescence. Drop-out from sport participation was prevalent in adolescence while the overall physical activity started to decline already around the age of school entry among highly, moderately and low active children. The studies using self-reported measures of physical activity reported the decline of physical activity to be initiated around the age of ten while studies using modern, objective measures of physical activity found the corresponding age to be as early as seven years of age.

“However, it seems that the physical activity level of those decreasing their physical activity does not approximate to the level of the inactive ones before reaching mid-age or old age,” says PhD student Irinja Lounassalo from the Faculty of Sport and Health Sciences at the University of Jyväskylä. “Thus, despite the common declining tendency of physical activity throughout the life course, being physically active in childhood and adolescence may be of high importance since it can postpone the time of becoming inactive later on.”

The results support previous findings of the relatively high proportion of persistently inactive individuals at all ages, with this proportion increasing with age. Interestingly, subgroups of increasingly active participants were observed among adults and older adults.

“In the future, special attention should be paid to these individuals who increase their physical activity, because it is important to understand how potential lifelong inactivity could be turned into activity,” Lounassalo suggests.

Having parental support for an active lifestyle was associated with increasing physical activity among children and adolescents, low television viewing time with persistent activity among adolescents, smoking cessation with increased activity among adults, and no chronic illnesses, a low mortality rate and good physical functioning with persistent activity among older adults. Generally, male gender, being Caucasian and having higher socioeconomic status were associated with persistent activity.

“Since physical activity behavior stabilizes with age and inactivity is more persistent behavior than activity, interventions should be targeted at children early in life before their habits become stable,” emphasizes Lounassalo. “Additionally, supporting schools and sport clubs is crucial for promoting an active lifestyle for all children. Since parents may have an effect on activating their children, parents would need support for finding ways to do that. Building publically available sport facilities and safe bicycling and walkways might help in increasing opportunities for being active regardless of age, nationality, gender or educational level.”

This shows a young boy sitting on a skate board
The results support previous findings of the relatively high proportion of persistently inactive individuals at all ages, with this proportion increasing with age. Interestingly, subgroups of increasingly active participants were observed among adults and older adults. The image is in the public domain.

Twenty-seven articles published between 2004 and 2018 were included in this systematic review. All of the included studies used the so-called trajectory approach for identifying the distinct subgroups (i.e. trajectory classes) from the data at hand.

“Only in recent years has the number of studies identifying distinct physical activity trajectory classes increased,” Lounassalo explains. “In trajectory studies, the target behavior of individuals in the same trajectory class is expected to be similar, while it differs from that of the individuals in the other classes. The studies included in this review most commonly reported three or four physical activity subgroups describing either persistent, increasing or decreasing activity or inactivity.”

About this neuroscience research article

University of Jyväskylä
Media Contacts:
Irinja Lounassalo – University of Jyväskylä
Image Source:
The image is in the public domain.

Original Research: Open access.
Lounassalo, I., Salin, K., Kankaanpää, A., Hirvensalo, M., Palomäki, S., Tolvanen, A., Yang, X. & Tammelin, T. H. 2019. “Distinct trajectories of physical activity and related factors during the life course in the general population: a systematic review”. BMC Public Health, Article number: 19:271. doi:10.1186/s12889-019-6513-y


Distinct trajectories of physical activity and related factors during the life course in the general population: a systematic review

In recent years, researchers have begun applying a trajectory approach to identify homogeneous subgroups of physical activity (PA) in heterogeneous populations. This study systematically reviewed the articles identifying longitudinal PA trajectory classes and the related factors (e.g., determinants, predictors, and outcomes) in the general population during different life phases.

The included studies used finite mixture models for identifying trajectories of PA, exercise, or sport participation. Three electronic databases, PubMed (Medline), Web of Science, and CINAHL, were searched from the year 2000 to 13 February 2018. The study was conducted according to the PRISMA recommendations.

Twenty-seven articles were included and organized into three age group: youngest (eleven articles), middle (eight articles), and oldest (eight articles). The youngest group consisted mainly of youth, the middle group of adults and the oldest group of late middle-aged and older adults. Most commonly, three or four trajectory classes were reported. Several trajectories describing a decline in PA were reported, especially in the youngest group, whereas trajectories of consistently increasing PA were observed in the middle and oldest group. While the proportion of persistently physically inactive individuals increased with age, the proportion was relatively high at all ages. Generally, male gender, being Caucasian, non-smoking, having low television viewing time, higher socioeconomic status, no chronic illnesses, and family support for PA were associated either with persistent or increasing PA.

The reviewed articles identified various PA subgroups, indicating that finite mixture modeling can yield new information on the complexity of PA behavior compared to studying population mean PA level only. The studies also provided novel information how different factors relate to changes in PA during life course. The recognition of the PA subgroups and their determinants is important for the more precise targeting of PA promotion and PA interventions.

Trial registration
PROSPERO registration number: CRD42018088120

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