1. Introduction
Physical activity (PA) is a vague term that can refer to a broad range of activities with varying levels of intensity and frequency. In the most general sense it is defined as an increase of energy expenditure by moving one’s body [
1,
2]. Some researchers have mentioned the importance of covering different domains of physical activity instead of referring only to sport and exercise. These domains are walking, cycling, leisure time, housework, transportation, and occupational physical activity [
3,
4,
5,
6,
7,
8]. The World Health Organization states that globally, one in four adults do not meet the global recommended levels of physical activity [
9]. Regular physical activity has been proven to help prevent and manage non-communicable diseases such as heart disease, stroke, diabetes, several cancers, hypertension; aid the maintenance of a healthy body weight (normal BMI – body mass index); and can improve mental health, quality of life and well-being [
9,
10,
11,
12,
13,
14]. It was reported as effective as an adjuvant treatment in major depressive disorder [
15], helping improve functioning parameters in depressed patients and lowering depression symptoms. Aerobic exercises were found effective in reducing depression symptoms [
16]. Adding high-intensity exercise to aerobic training was found efficacious in improving mood and depression levels [
17]. Yoga-type, stretching and resistance training exercises were reported as effective coping strategies for reducing levels of anxiety [
18]. They also help maintain cognitive function [
6,
19,
20]. Adequate levels of physical activity have been shown to result in emotional well-being and increased energy [
7].
In different papers physical activity is classified into different levels, most often high (e.g. jogging, swimming, training at a gym, tennis), moderate (e.g. daily walking for at least 1 hour ) and low [
4,
5]. In their position statement on physical activity and exercise intensity terminology, Norton, Norton, and Sadgrove [
10] offered a more distinct designation of physical activity: sedentary, light, moderate, vigorous and high [
10]. The Youth Compendium [
3] provided a list of 196 physical activities categorized by activity types, specific activities, and metabolic costs. For the purpose of our study, we focused on several levels and types of physical activity: (1) medium to high-intensity exercises (running, aerobics, swimming) (PA type 1), (2) low to medium intensity, stretching exercises (e.g. yoga, Tai-Chi, stretching, Pilates, etc.) (PA type 2), and (3) outdoor leisure group sport and other PAs (gardening) (PA type 3). These physical activities were categorized according to the first original article [
21], the aim of which was to explore the emotional state of participants and if different types of PA could play moderate emotional state, for example, PA type 1 could reduce depressive states [
16]; PA type 2 reduced anxiety [
18]; and PA type 3, could do both and also increase life satisfaction [
22].
Several studies have demonstrated the positive impact of high-intensity and medium-intensity sports activity on physical and mental health outcomes [
23,
24,
25,
26,
27]. High-intensity interval training (HIIT) in adolescents (n = 65; mean age = 15.8 ± 0.6 years) for 8 weeks showed improved mean feeling state scores and psychological well-being (in the aerobic group there were small improvements in executive function (mean change (95% CI) -6.69 (-22.03, 8.64), d = -0.32) and psychological well-being (mean change (95% CI) 2.81 (-2.06, 7.68), d = 0.34)) [
23], can reduce ill-being in children and adolescents, and may also enhance self-efficacy (22 studies, small to moderate effects were found for executive function (standardized mean difference [SMD], 0.50, 95% confidence interval [CI], 0.03-0.98; P = 0.038) and affect (SMD, 0.33; 95% CI, 0.05-0.62; P = 0.020), respectively) [
24], and can help reduce anxiety and depression [
25]. HIIT improved cardiorespiratory fitness, anthropometric measures, blood glucose and glycaemic control, arterial compliance and vascular function, cardiac function, heart rate, exercise capacity, increased muscle mass, and reduced inflammatory markers compared to non-active controls [
25]. Both aerobic training and strength/flexibility training appear equally effective for treating depressive and anxiety symptoms [
27]. Light to moderate physical activity that is performed regularly seems to be associated with a more favorable mental health pattern compared with physical inactivity (n=177, 49% male, mean age - 39) [
28].
This type of activity (medium-to high intensity) has also been shown to have positive effects on the BMI reduction (25 articles, single-component (84%) or a hybrid-type, multi-component (16%) HIIT protocol and involving 930 participants) [
26]. For high-intensity sports, the reviewed studies suggest that participation in sport is associated with higher levels of alcohol consumption, but lower levels of cigarette smoking and illegal drug use (based on 34 peer-reviewed studies) [
29].
Several studies have also showed the positive role of low-to-moderate-intensity physical activity (e.g. yoga, Tai-Chi, stretching, Pilates, etc.) for physical [
30] and mental health [
31] outcomes. In a study involving participants with chronic major depressive disorder or bipolar disorder, the inclusion of 11 weeks of hatha yoga classes in their therapy showed a significant reduction in depression and anxiety scales (n=14, median depression scales decreased by 38% and median anxiety scales decreased by 50%) [
32]. Additionally, the positive effects of this type of activity, specifically Thai Yoga, have been demonstrated in overweight/obese older women [
33].
In our study, PA type 3 is related to outdoor leisure group sport and other PA (gardening). It is generally noted that low-intensity physical activity is more common among older adults [
34,
35]. In the work of Takiguchi et al. [
34] a relationship was shown between leisure activities and reduction of depression when resilience played role as a mediator (n=300, Japanese participants). In a study by Sala et al (n=809, age – 72-74, Japanese), engaging in leisure activities was positively associated with all three indicators of successful aging: preservation of cognitive function, physical function, and mental health [
35]. Several studies have shown a positive correlation between leisure activities and various aspects of mental health and well-being. Ponde & Santana (n=552, Brazil) [
36] demonstrated that participation in leisure activities may help maintain mental health under adverse life conditions. In a study by Müllersdor et al. (n=39 995, Swedish participants) [
37], a positive correlation was shown between pet ownership and leisure activities (interest in nature and gardening), pet owners also showed better overall health than those without pets. However, these individuals were more likely to suffer from mental disorders than non-pet owners. An inverse relationship between leisure activity and general practitioner (GP) visits was demonstrated in a study by Martin et al. (n = 1000, 75.32 +/- 6.72 years old) [
38]. Several studies have shown that more active older adults demonstrate better health outcomes and are less likely to visit doctors [
39,
40,
41]. Fisher et al. [
39] examined the relationship between leisure time physical activity and health services utilization (n=56 652, Canadian, 48% male; mean age 63.5 ± 10.2 years). They showed that active 50-65-year-old individuals were 27% less likely to report any GP consultations (ORadj = 0.73; P < 0.001) and had 8% fewer GP consultations annually (IRRadj = 0.92; P < 0.01) than their inactive peers.
Several studies have demonstrated the role of time spent outdoors and physical activity in promoting mental health [
42,
43,
44,
45,
46]. Such physical activity impacted self-esteem, self-motivation, willpower, and readiness to solve complex tasks [
47,
48,
49]. In a study by Jackson et al. (N = 624, ages 10–18, United States) [
50], it was shown that adolescents who engaged in outdoor activity more frequently reported less decline in subjective well-being during the COVID-19 Pandemic, indicating the important role of being outdoors in increasing resilience to stress.
In a study by Johnson et al [
51], a six-week intervention involving outdoor exercise resulted in average decreases in body weight (-1.08%) and fat percentage (-7.58%) compared to baseline measures. In a cohort study by Cleland et al, adolescents who spent more time outdoors had 27-41% lower rates of obesity. Similarly, Deforche et al [
52] also demonstrated the positive role of physical activity in reducing obesity among adolescents.
Smoking alone is related to a range of health problems, including mood and anxiety disorders [
1], earlier aging and death [
6]. Along with physical activity it is seen as one of the most important lifestyle factors in terms of preventing chronic diseases [
6,
9]. The interdependence of smoking and physical activity is controversial.
Martinez-Gonzalez et al. [
53] showed that higher levels of education were positively associated with a greater tendency to increase leisure-time physical activity for both men and women. The authors also revealed an inverse relationship between body mass index and low-intensity physical activity. Kim et al [
54] revealed that higher life satisfaction was associated with fewer doctor’s visits, and that factors such as physical activity may influence increased life satisfaction. A positive association between physical activity and fewer visits to doctors was also confirmed in Kim et al. [
54].
A face-to-face interview of 16,230 respondents was conducted by Eurobarometer in 2002 [
53] to access physical activity in the 15 member states of the European Union. It was revealed that different European countries differ greatly in the level and nature of physical activity. Finland was the most active (92%), while Portugal was the least active (41%). Belgium occupied a middle position (62%) [
53]. European countries also differed greatly in other indicators, such as days of vigorous and moderate physical activity, days of walking, and metabolic equivalence estimates [
55]. Hence, it is more fitting to scrutinize epidemiological data that pertains to a specific country, rather than relying on a broad European sample. This study, for instance, focuses on analyzing the epidemiological data of the Belgian population.
This study's main strengths were having a large representative sample from the general population and simple categories defining physical activity, making them easier for the public to identify. Our findings add experimental evidence in support of extant research [
56] to suggest a positive influence of physical activity on reducing the frequency of doctor’s visits. This data is needed to better tailor further interventions. It is important to know more about the association between healthy lifestyle behaviors and physical activity in order to better formulate public health strategies. The novelty of this study is in the investigation of the relationships of frequency of different types of physical activities with public health (physical and mental). The preliminary results of this study were presented at the ISEE (International Society for Environmental Epidemiology) conference [
57].
1.1. General aim of this study:
To investigate if the frequency of practicing three different types of physical activity (PA) (dependent variables) is associated with healthy life styles, consumption habits (smoking and alcohol), BMI, level of study, age, sex and the number of visits of all doctors (except of psychiatrists) and psychiatrists (physical and mental health indicators), obtained retrospectively from the health registries of the 10 years preceding the rest of data collection (independent variables).
1.2. Main hypotheses:
A higher frequency PA type 1 (H1), type 2 (H2) and type 3 (H3) is positively associated with:
1.2.1. Health indicators:
a) better physical health (namely with a lower number visits to all doctors except psychiatrists);
b) better mental health (with less visits to psychiatrists);
1.2.2. Healthy life style:
c) lower BMI;
d) higher alcohol consumption, and
e) less tobacco consumption.
Additionally, we would like to explore the associations of the frequency of engaging in the three types of PA with age and sex due to contradictory data in the literature.
3. Results
The descriptive statistics of the study variables are presented in
Table 1.
The descriptive statistics for sex subgroups are represented in Annex 3 (Table A3.1 for women, Table A3.2 for men). All study variables differed for both sex subgroups at a statistically significant level p<.001 (except PA type 1 -intensive to medium sport exercises-, where the p-value was .015, but also significant) measured as per bivariate analysis (chi-square).
Multinomial logistic regression analysis was performed in order to observe where (and in which magnitude) a significant relationship between the three types of physical activities and observed variables of a healthy life style (BMI, health indicators and substance consumption habits – smoking and alcohol) exists. For general (physical) health indicators, the sum of the number of all doctor’s visits, except psychiatrists and for mental health, the sum of number of visits to psychiatrists from the clinical histories were used as proxies. The results, expressed in terms of Relative Risk Ratios (RRR) and 95% confident intervals (CI), are shown for the total group, and for women and men analyses for each type of physical activity: PA type 1 –
Table 2; PA type 2 –
Table 3; and PA type 3 –
Table 4.
Additional regression analysis also showed that the physical health indicators of the participants of this study have a statistically significant (p<.05) direct relationship with their age and an inverse relationship with the level of education. In contrast, mental health indicators have a statistically significant (p<.05) inverse relationship with the age of the participants and a direct relationship with the level of education.
Age was directly associated at the statistically significant level with practicing PA type 1 only in women (
Table 2), meaning that with increasing age, more frequent engagement in such physical activities was reported by the study participants. Men were more prone to practice such sport activities at the “almost always” level compared to women due to direct relationship between variable sex (men were coded with a higher number, see Annex 2) compared to women (
Table 2). BMI was reversely associated with practicing PA type 1 (more frequent practicing– lower BMI) (
Table 2).
Level of study played a significant relationship with PA type 1, indicating the direct relationship between level of study and the frequency of practicing PA type 1 (
Table 2).
A higher frequency of all doctors’ visits except psychiatrists (indicator of physical health) was significantly associated with less frequent practice of PA type 1. A weaker and inverse relationship was shown with the frequency of psychiatrist visits (indicator of mental health) with this PA. In the reverse direction, higher frequency of РА type 1 was associated with higher physical health indicators (i.e., fewer visits to doctors except psychiatrists) and higher mental health scores (i.e., fewer visits to psychiatrists), but only at the level of group values if compare “almost always” with a baseline – “almost never” (p=.046) (
Table 2).
As for consumption habits, more frequent smoking was associated with less frequent PA type 1; whereas no significant relationship was observed with alcohol consumption, on the exception of a weak direct relationship (more frequent alcohol consumption was associated with more frequent practicing PA type 1) observed in women (RRR=1.12; p=.045) (
Table 2).
Similar to the PA type 1 results, the trends in BMI (reverse); age, and educational level (direct) were observed in the relationship with physical activity type 2 -Sport (stretching exercises, low to medium intensity - Yoga type) (
Table 3). The sex variable showed the inverse to the frequency of PA type 1 association, indicating more frequent practice in women compared to men (
Table 3).
A weak relationship with the indicator of mental health (sum of number of visits to psychiatrists) was observed at the whole group level when comparing “sometimes” practicing PA type 2 to baseline or “almost never”. When split by sex subgroups this relationship was shown at marginal p-levels (p<.10) (
Table 3). More frequent smoking was associated with less frequent practicing of stretching and relaxation exercises in both men and women (
Table 3).
Finally, for PA type 3 - Outdoor leisure group sport and other physical activities (gardening) showed similar trends to PA type 1 in the relationship with sex (men were more prone to practice it more frequently); age and educational level (direct: with higher age, more frequent practice and reverse relationships with BMI and smoking (
Table 4).
Both proxies of general and mental health indicators are associated with higher frequencies of practicing PA type 3 since a reverse relationship is observed between N of doctors’ visits and frequency of practice for the whole group, as well as separately for men and women (Tables 4).
As per the factors role association in our study, we found that a higher frequency of practicing PA type 1 was primarily linked to lower BMI (a protective factor; 47% probability of occurrence if practicing “almost always” and 24% for “sometimes” compared to the baseline – “almost never” practicing) and less or non-smoking behavior (a protective factor; 41% probability of occurrence with practicing “almost always” and 29% for “sometimes” compared to the baseline – “almost never”). Other important factors included having a higher level of education (a protective factor; 14% and 7% probability of occurrence with practicing “almost always” and “sometimes” respectively), and better physical health (measured by the number of all doctor’s visits, excluding psychiatrists) (a risk factor, 13% and 9% of occurrence for the categories with practicing PA 1 “almost always” and “sometimes”); mental health, expressed inversely by the sum of the number of visits to psychiatrists (a risk factor, 9% of occurrence of having more visits and only significant with practicing PA type 1 “almost always vs. the baseline “almost never”); higher alcohol consumption (7% occurrence, but it had a marginal association (p<0.10) for the whole group and practicing “almost always“, and was significant only in the women subgroup for the “almost always” category) (
Table 2).
A higher frequency of type 3 PA was also found to be associated with similar factors, firstly, a greater likelihood of a lower BMI, the second most significant factor was older age, the 3rd most significant factor was non-smoking behavior, and the fourth most significant factor was physical and mental health (
Table 4).
Frequency of PA type 2 was not found to be associated with physical health, but positively correlated with poor mental health (
Table 3). Moreover, while men showed a greater preference for practicing PA type 3 and 1 more than women, women showed a greater trend to practice PA type 2 more frequently (
Table 2,
Table 3 and
Table 4).