Zhi-de Liang
Meng Zhang
Chuan-zhi Wang
Yang Yuan
Jing-hong Liang- 1Cancer Institute of The Affiliated Hospital of Qingdao University and Qingdao Cancer Institute, Qingdao, China
- 2Postgraduate Department, Xi'an Physical Education University, Xi'an, China
- 3Department of Physical Education, College of Physical Education, Qingdao University, Qingdao, China
- 4Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
Background: Sedentary behavior (SB) and physical activity (PA) are modifiable risk factors for cardiovascular disease (CVD); however, previous research on the effects of PA and SB on CVD has been relatively homogeneous. Our study investigated the association between PA, SB, and CVD-related outcomes.
Methods: A comprehensive search strategy was conducted in the MEDLINE, Embase, Cochrane Library, and Web of Science databases from their inception to September 2022. We identified eligible studies according to PICOS: the populations comprised healthy adults, the interventions or exposures were PA or SB, the outcomes were CVD-related outcomes, and the study designs were randomized controlled trials (RCTs) and longitudinal studies (LS). Outcomes were pooled using fixed or random effects models, and the quality of individual studies was assessed by the Cochrane Risk of Bias Instrument and the Newcastle Ottawa Scale.
Results: A total of 148 RCTs and 36 LS were included, comprising a total of 75,075 participants. The study quality was rated as low to moderate. We found an increased hazard ratio (HR) for CVD in the population with SB (HR = 1.34; 95% confidence interval [CI]: 1.26 to 1.43; I2 = 52.3%; Pheterogeneity < 0.001, random model) and a decreased HR for CVD in those who performed long-term PA (HR = 0.71; 95% CI: 0.66 to 0.77; I2 = 78.0%, Pheterogeneity < 0.001, random model). Long-term PA improved the lipid profiles in healthy adults; participants in this group exhibited increased high-density lipoprotein (weighted mean difference [WMD] = 2.38; 95% CI: 1.00 to 3.76; I2 = 84.7%; Pheterogeneity < 0.001, random model), decreased triglycerides (WMD = −7.27; 95% CI: −9.68 to −4.87; I2 = 0%, Pheterogeneity = 0.670, fixed model), and lower total-cholesterol (WMD = −6.84; 95% CI: −9.15 to −4.52; I2 = 38.4%, Pheterogeneity < 0.001, random model).
Conclusions: Long-term SB increases the risk of CVD in healthy adults, whereas PA reduces the risk of CVD and improves indicators associated with CVD. However, the ability of PA to improve blood lipids appeared to be limited. The detailed association of SB and PA on CVD needs to be further investigated in the future.
Introduction
Cardiovascular disease (CVD) is a general term for a group of cardiovascular disorders, including coronary heart disease (CHD), heart failure (HF), aortic atherosclerosis, cerebrovascular disease, and peripheral artery disease (1). The advancement of medical technology and the dramatic improvement of the health environment have greatly reduced the mortality rate from infectious diseases and substantially increased life expectancy. In developed countries as well as some developing ones, chronic diseases, especially CVD, have become the leading cause of death (2). For example, in China, CVD accounts for 40% of deaths in the Chinese population (3), and the incidence of CVD increased by 14.7% between 1990 and 2016 (4).
The causes of CVD are multifactorial, and many CVD risk factors are not modifiable; these include age, gender, race, and family history of heart disease. However, other risk factors are modifiable; these include smoking, alcohol abuse, obesity, physical inactivity, a sedentary lifestyle, diet, hypertension, diabetes, and dyslipidemia (5, 6). Sedentary behavior (SB) is defined as spending waking hours in a sitting, reclined, or lying position and is characterized by low energy expenditure (≤1.5 metabolic equivalents for task [METs]) (5). Several studies have demonstrated that SB is a major modifiable risk factor for CVD (7–9), and sitting for more than 6 h per day is associated with an increased risk of 12 common chronic diseases. However, replacing sitting time with physical activity (PA) of varying intensities may reduce the risk of these chronic diseases (10). Therefore, PA has been proposed as an alternative strategy to improve quality of life and reduce the risk of CVD (11). The World Health Organization defines PA as “any physical movement produced by skeletal muscle that results in energy expenditure,” and PA can be categorized into different types depending on the exercise mode, intensity, frequency, and duration (12). A meta-analysis comparing the effects of five types of PA on cardiometabolic health in people who were obese or overweight found that all types of PA played a key role in improving cardiometabolic health (13). Another meta-analysis demonstrated that PA reduced fatigue in patients with cancer and those who had received hematopoietic stem cell transplants (14). Other studies have revealed that PA reduces mortality, improves the quality of life of patients with CVD, and protects against damage at the early stages of myocardial infarction (15, 16).
Although previous studies have shown that PA can significantly improve the quality of life of patients with CVD (17, 18), research in this area is still insufficient. First, the results of previous studies on the association between CVD and PA are limited because they have focused primarily on cardiovascular mortality (CVM); few studies have investigated other CVD-related outcomes (19, 20). Therefore, the present study examined the effects of PA on all CVD outcomes to help fill the knowledge gap resulting from the one-sidedness of previous studies, and it aimed to elucidate the different effects of PA on CVM and other CVD outcomes. Second, several studies have found that PA reduces the risk of cardiovascular disease, but they did not distinguish between the age, region, and economic status of the participants (21). Third, the size and diversity of populations investigated in previous studies have been limited, including those with underlying diseases, and further research is needed to ensure that these findings are generalizable to healthy people (22). Fourth, CVD is a chronic disease that requires evidence not only from randomized controlled trials, but also from longitudinal studies, but previous studies have focused on only one of these (23, 24). Therefore, combining these two types of evidence can better analyze the association between PA, SB and CVD. Moreover, the number of published studies on the effects of SB and PA on CVD has increased significantly in recent years (25, 26). However, because of the increased volume of data, updated reviews are needed to provide more reliable evidence. Therefore, we conducted a comprehensive systematic review and meta-analysis of the literature to characterize and quantify the association between PA, SB, and CVD-related outcomes.
Methods
This meta-analysis was conducted following the recommendations of the Cochrane Collaboration Handbook (27) and the framework for meta-analysis of longitudinal studies in epidemiology (28). No ethical approval or patient consent was required because all analyses were performed using data from previous studies.
Search strategies and study selection
To identify publications on PA and SB in healthy adults, an exhaustive, strategic literature search of the MEDLINE, Embase, Cochrane Library, and Web of Science databases was conducted from their inception until September 2, 2022. The search strategy did not include any restrictions and consisted mainly of medical subject headings associated with keywords, free words, and Boolean operators. The detailed search strategy is described in the Appendix (p. 1); in brief, the following search terms were used: “cardiovascular disease,” “sedentary behavior,” “adults,” “exercise,” “training,” “physical activity,” “aerobic exercise,” “triglyceride,” “glucose,” “lipoproteins,” and “randomized controlled trial.”
In addition, a recursive search for relevant publications was conducted by manually searching the bibliographic lists of similar reviews and large professional conferences. At least two investigators (ZM and LZ) performed the study selection and data extraction independently, and discrepancies that arose during the process were resolved by consulting a third investigator (YY). Title and abstract screening was used to eliminate duplicates, reviews, and irrelevant studies. Subsequently, potentially eligible studies were screened, and their full text was downloaded; those that could not be downloaded in full were excluded. The selected citations were independently cross-checked for completeness and accuracy by two investigators. All citations were managed and analyzed with EndNote X9 software (Thompson ISI Research Soft, Clarivate Analytics, Philadelphia, Philadelphia, USA).
Inclusion and exclusion criteria and data abstraction
Studies that met the following eligibility criteria were included.
Population
Participants were healthy adults aged 18 years or older; were physically independent; had no current cardiovascular or other significant medical conditions; had no history of medical conditions preventing them from participating in the exercise intervention; were not currently taking any medications; and had not engaged in regular PA in the past 1–2 years according to a physician report or self-report (obtained through a standard diagnostic interview).
Interventions and exposure
Studies on PA interventions in healthy adults were included. All participants received the PA intervention at least twice a week for at least 8 weeks, as recommended by the American College of Sports Medicine Guidelines (29). PA was defined as any type of body activity that resulted in energy expenditure (12). The specific breakdown of PA types was as follows (30, 31): (1) Aerobic exercise (AE), defined as exercise to improve cardiovascular health, including walking, running, and cycling. (2) Resistance exercise (RE), defined as exercise to increase muscle strength, such as using elastic bands and dumbbells. (3) Multicomponent exercise (ME), defined as a combination of at least two exercise types, such as AE, RE, and balance training; and (4) Mind–body exercise (MBE), defined as exercise to improve participants' physical and mental coordination through awareness exercises, such as Tai chi, yoga, and dance. In the interventions described above, PA was performed with and without supervision.
In addition, longitudinal studies on SB and PA in healthy adults were included to investigate the association between PA, SB, and CVD events (fatal or non-fatal). SB was defined as waking behavior characterized by low energy expenditure (≤1.5 METs) (5), including sitting or reclining at leisure, at work, in traffic, and at home. SB and PA time was obtained by a standardized questionnaire or self-report. If more than two PA or SB levels were present in a study, they were categorized into two groups—high PA or SB and low PA or SB—and the low PA or SB group was considered the reference category.
Comparators
The comparators included a non-exercise control group, a health education group, and a group that maintained their current lifestyle.
Outcomes
The primary outcomes of randomized controlled trials (RCTs) were lipid levels (triglycerides [TGs], total cholesterol [TC], high-density lipoprotein [HDL], and low-density lipoprotein [LDL]), and various clinical measures were used to assess changes in these metrics from baseline to endpoint. The secondary outcomes were other indicators related to CVD risk factors, namely body mass index (BMI), systolic blood pressure (SBP), diastolic blood pressure (DBP), and blood glucose.
For longitudinal studies, any type of CVD incidence or mortality was selected as the primary outcome; this indicator was included in most studies and was considered an appropriate choice for acceptability.
Study design
Our study included all types of randomized controlled trials (RCTs), and to further explore the effect of SB and PA on CVD incidence, population-based longitudinal studies (including any type of prospective cohort or retrospective cohort study) were also included; no restrictions were placed on publication date, race, or region. Studies were excluded if (1) the study type was a systematic review, meta-analysis, or protocol; (2) the full text of the data analysis or data details were not available; or (3) the intervention method was a combination of PA and other methods.
Outcome measurement and quality assessment
The following key information was extracted: first author; year of publication; source; intervention or follow-up time; intervention dose; study type; sample size; and baseline characteristics of the participants, such as age and gender. If the baseline data were not available in the text, they were obtained by contacting the corresponding author.
The quality of the RCT was independently assessed by two reviewers (ZM and ZD) according to the Cochrane Risk of Bias tool (32), which consists of seven items: random sequence generation; allocation concealment; participant and personnel blinding; outcome assessment blinding; incomplete outcome data; selective reporting and other biases; and items judged as having high risk, low risk, and unclear risk.
All prospective and retrospective studies were evaluated by the Newcastle–Ottawa Scale (NOS), which consists of three main items: patient selection, comparability of the intervention and observation groups, and assessment of outcomes. Studies with NOS scores ≥7 were considered high-quality (33, 34). Two reviewers scored each study independently, and in cases of disagreement, a third reviewer reviewed their assessments.
Statistical analyses
A traditional paired meta-analysis was conducted for the trials that satisfied the inclusion criteria (27). For the results of continuous variables, baseline and terminal mean differences and standard deviation (SD) were extracted; if they were not provided, different methods were used to convert the data to a standard format (35, 36). If the study was a multi-arm RCT, all PA and control group data were extracted. A quantitative pooled analysis was performed according to a fixed-effects model (inverse variance), and forest plots were constructed to derive the weighted mean difference (WMD) and 95% confidence interval (CI); if heterogeneity existed, a random effects model was used (D-L heterogeneity approach) (27). Hazard ratios (HRs) and their 95% CIs were included as pooled effects for the longitudinal studies. Because such variables must be symmetric and follow a normal distribution, logarithmic transformation was performed, and a random effects model was then used to explain the effects of between-study heterogeneity (37).
The presence of heterogeneity was determined by examining the forest plots and I2 statistics according to the latest version of the Cochrane Handbook (27). I2 statistics were used to assess statistical heterogeneity, with estimates of 25, 50, and 75% indicating mild, moderate, and high heterogeneity, respectively; a P-value of < 0.1 was considered statistically significant (38, 39). Sensitivity analyses and a series of subgroup analyses were performed to identify the sources of heterogeneity by statistical methods, and the literature-by-deletion method was employed to analyze sensitivity. Funnel plots were used to check for publication bias, which mainly arises from publication bias, selective reporting, or other sources. Finally, Egger's tests were carried out to quantitatively evaluate whether the studies had publication bias, and P < 0.05 indicated the absence of publication bias (40). To explore the sources of heterogeneity and the relationships of primary outcomes in different conditions, a subgroup analysis was performed; variables of interest included the region (the U.S. vs. other countries; developed vs. developing countries), the intervention time or follow-up time (≤12 weeks vs. >12 weeks or ≤10 years vs. >10 years, respectively), age ( ≤60 years vs. >60 years), quality of the literature (NOS <7 vs. NOS ≥7), gender distribution (male ≥ female vs. male < female), sample size (≤10000 vs. >10000), CVD outcomes (fatal vs. non-fatal), year of publication (≤2015 vs. >2015; ≤2016 vs. >2016), SB vs. no SB, and PA type (AE, RE, ME, and MBE). The above analyses were performed in STATA software version 15.1 (Stata, Corp, College Station, Texas, USA).
Results
Study selection and characteristics of the included studies
We obtained 75,075 studies from the database and identified 42 studies through other sources; of these, 4,544 studies were excluded because of duplication, and 70,184 were excluded on the basis of their titles and abstracts. After full-text screening of the remaining 347 studies, a total of 163 publications were excluded for the following reasons: 37 studies did not meet the study type criteria; 56 studies did not have appropriate outcomes or did not provide data that could be analyzed; 46 studies included participants that did not satisfy the inclusion and exclusion criteria (patients with underlying diseases, younger than 18 years, or currently taking medication); and 24 studies included interventions other than PA. Ultimately, we included 184 studies, of which 148 were RCTs and 36 were longitudinal studies (Supplementary Table S1). Three longitudinal studies assessed both PA and SB. The study selection process is shown in Figure 1.
Figure 1. Literature review flowchart. LS, Longitudinal studies; PA, physical activity; RCT, randomized controlled trial; SB, sedentary behavior; WOS, web of science.
A total of 1,011,473 participants aged between 18 and 100 years old were recruited in the 184 included studies; 8,166 and 1,003,307 participants were included in the RCTs and the longitudinal studies, respectively. The proportion of male participants was lower than that of female participants (males in RCTs: 2,686 [32.9%]; males in longitudinal studies: 412,519 [41.1%]). The intervention duration in the RCTs ranged between 8 weeks and 24 months, and the mean follow-up time in the longitudinal studies was 11.4 years. Participants were mainly recruited in Europe (N = 61, 33.2%) and North America (N = 55, 31.5%). We extracted several indicators related to CVD risk from the RCTs, including BMI (N = 89), blood pressure (SBP: N = 65, DBP: N = 63), blood lipids (TGs: N = 76, TC: N = 79, HDL: N = 84, LDL: N = 78), and blood glucose (N = 65). The demographic characteristics of the included studies are summarized in Supplementary Table S1. Subgroup analyses of the main outcomes are shown in Table 1.
Table 1. Outcomes and subgroup analysis based on indicators related to CVD.
And the forest plots and funnel plots of all outcomes will be presented in the Appendix (p. 23–37).
Quality of the included studies
Of the 148 RCTs, 36 had a low risk of bias in random sequence generation, 17 had a low risk of selection bias, 18 had a low risk of performance bias, and 27 had a low risk of detection bias. Only six studies had a high risk of abrasion bias, and most studies had a low risk of reporting bias (143/148, 97.3%). The detailed assessment process is shown in Supplementary Figures S1, S2.
Of the 36 longitudinal studies, 29 received a score of 7 and were considered high-quality according to the NOS criteria; the detailed assessment process is shown in Supplementary Figure S3.
Primary outcomes
RCTs
Of the RCTs, 76 studies (4,658 participants) explored the effects of long-term PA on TGs, 79 studies (4,512 participants) described the effects of PA on TC, 84 studies (5,018 participants) investigated the effect of PA on HDL, and 78 studies (4,757 participants) described the effects of PA on LDL (Table 1). Most studies reported fasting lipids; only two studies (41, 42) reported non-fasting lipids. We pooled the WMD effect sizes according to a fixed model or a random model. The results showed that long-term PA significantly increased HDL levels (P < 0.001) and decreased TGs (P < 0.001), TC (P < 0.001), and LDL (P < 0.001). The pooled results for TG levels were as follows: WMD = −7.27; 95% CI: −9.68 to −4.87; I2 = 0%, Pheterogeneity = 0.670 (fixed model); TC: (WMD = −6.84; 95% CI: −9.15 to −4.52; I2 = 38.4%, Pheterogeneity < 0.001, random model); HDL: (WMD = 2.38; 95% CI: 1.00 to 3.76; I2 = 84.7%; Pheterogeneity < 0.001, random model); LDL: (WMD = −5.80; 95% CI: −8.04 to −3.57; I2 = 65.5%, Pheterogeneity < 0.001, random model). Among the four lipid indices, only the funnel plot for TC showed symmetry; the rest of the indices did not show symmetry (Supplementary Figures S17–S20). The Egger's test results were as follows: TGs, P < 0.05; TC, P = 0.937; HDL, P = 0.240; and LDL, P < 0.05.
To explore possible sources of heterogeneity, subgroup analyses of lipid outcomes were performed, grouping participants according to intervention time, region, age of participants, year of publication, male/female ratio, previous SB or no previous SB, and PA type. Some of the subgroup analyses were consistent; however, when studies were divided according to their male/female ratios, less heterogeneity was observed in the combined effect of long-term PA on TC in the studies with more males (WMD = −8.47; 95% CI: −2.38 to −4.56; I2 = 20.4%, P = 0.164, random model). Similarly, when studies were divided according to the type of PA, less heterogeneity was observed in studies on the effect of ME on LDL (WMD = −4.47; 95% CI: −7.04 to −1.90; I2 = 20.4%, P = 0.164, random model). In addition, PA was associated with a significant improvement in HDL only if participants were younger than 60 years old (P < 0.001), the intervention duration was longer than 12 weeks (P < 0.01), the study was conducted in people without previous SB habits, or the study assessed AE (P < 0.01) or RE (P < 0.01). The detailed subgroup analyses are presented in Table 1.
Longitudinal studies
Eighteen studies analyzed the effect of SB on CVD (Table 1). The results showed that people with SB had a significantly increased risk of CVD (P < 0.001), both fatal and non-fatal, with a pooled effect size (HR) of 1.34 (95% CI: 1.26 to 1.43) and relatively high heterogeneity (I2 = 52.3%, Pheterogeneity < 0.001, random model). The funnel plot was asymmetric, and the publication bias was high (PEgger′s test < 0.05) (Supplementary Figure S22).
Twenty-one studies explored the effect of PA on CVD (Table 1). The results showed that long-term PA was associated with a significantly lower risk of CVD compared with low levels of PA (P < 0.001), with a pooled effect size (HR) of 0.71 (95% CI: 0.66 to 0.77) and high heterogeneity (I2 = 78.0%, Pheterogeneity < 0.001, random model). The funnel plot was also asymmetric, showing potential publication bias (PEgger′s test = 0.605) (Supplementary Figure S23).
We performed subgroup analyses by dividing the studies according to several variables of interest (region, year of publication, male/female ratio, number of participants, follow-up time, quality of literature, and type of CVD), and some subsets of these subgroup analyses revealed sources of heterogeneity. For example, in the SB and CVD studies, heterogeneity was significantly lower in studies with population sizes under 10,000 (HR = 1.56; 95% CI: 1.37 to 1.77; I2 = 21.2%, P = 0.255, random model) than in studies with population sizes greater than 10,000 (HR = 0.28; 95% CI:1.20 to 1.36; I2 = 49.1%, P = 0.033, random model). Other sources of heterogeneity are detailed in Table 1.
Secondary outcomes
RCTs
BMI
According to the pooled combined effects of BMI using a fixed effects model, 89 RCTs (6,220 participants) revealed a significant effect regarding BMI reduction (WMD = −0.36; 95% CI: −0.43 to −0.30; I2 = 0%, Pheterogeneity = 0.998, fixed model) (Table 1); however, the asymmetry of the funnel plot of BMI indicators suggested potential publication bias (PEgger′s test = 0.051) (Supplementary Figure S14).
Blood pressure
A total of 65 RCTs (3,500 participants) explored the effects of PA on SBP, and 63 (3,373 participants) investigated the effects of PA on DBP (Table 1). The resting blood pressure in both sitting and supine positions was included. The combined effect showed a significant reduction in SBP (WMD = −3.63; 95% CI: −4.62 to −2.64; I2 = 58.0%, Pheterogeneity < 0.001, random model) with some heterogeneity. DBP also decreased significantly by a small margin (WMD = −2.25; 95% CI: −2.94 to −1.56; I2 = 51.3%, Pheterogeneity < 0.001, random model), and heterogeneity was observed. The forest plots for both indicators were asymmetric, and publication bias was detected (SBP: P = 0.261, DBP: P < 0.001) (Supplementary Figures S15, S16).
Blood glucose
A random effects model was used to pool glucose from 65 RCTs (3,413 participants) (Table 1), all of which required participants to fast for 8–14 h; the model revealed that PA was associated with a significant improvement in fasting glucose (P < 0.001) with high heterogeneity (WMD = −4.40; 95% CI: −5.44 to −3.36; I2 = 86.5%; Pheterogeneity < 0.001, random model). The asymmetry of the forest plot suggested high publication bias (PEgger′s test = 0.838) (Supplementary Figure S21).
Sensitivity analyses
Sensitivity analysis showed that all outcomes were stable for PA and SB.
Discussion
This is the first meta-analysis to combine randomized controlled trials and longitudinal studies to assess the association between SB, PA, and CVD. The analysis of 148 RCTs and 36 longitudinal studies indicated that long-term PA improved indicators related to CVD risk in healthy adults and directly reduced the risk of CVD. Conversely, long-term SB increased the risk of CVD in healthy people, regardless of the study region, the gender of participants, and follow-up time. In addition, long-term PA was not associated with a large improvement in HDL in studies on older adult populations, studies on previously sedentary populations, studies with short-term interventions, or studies that assessed ME.
SB has been identified as a risk factor for CVD in several previous studies (43, 44). Our meta-analysis confirmed the association between SB and CVD (HR:1.34; 95% CI: 1.26 to 1.43; I2 = 52.3, P < 0.01; random model), suggesting a 34% increase in the risk of CVD (including non-fatal CHD, HF, and fatal myocardial infarction events) in people with frequent SB compared with those without SB. Evidence suggests that of the factors associated with all causes of CVD mortality, SB has the strongest association (8), and several other studies have reported strong, consistent results supporting this association. A prospective cohort study on 134,596 Americans found that the risk of death from CVD rose with increased sitting time, particularly while viewing television, and this finding was consistent across people of different weights, genders, and races; similar results were found in our study (45). A lack of PA due to SB leads to the decreased turnover of endogenous energy stores, myogenic glycogen, and intracellular lipids; in turn, these changes lead to skeletal muscle insulin resistance. When hyperinsulinism occurs, adipogenesis increases, promoting the production of very low-density lipoproteins and lower HDL levels in the liver. This results in the development of metabolic syndrome, which may contribute to the development of CVD. Similarly, steatosis may cause hyperglycemia, which not only causes diabetes but also potentially increases the risk of CVD (46, 47). In conclusion, the mechanisms through which SB causes CVD are complex and multifaceted.
We investigated the effects of long-term PA on CVD and several CVD risk indicators and found that long-term PA not only reduced the HR of CVD events (HR = 0.71; 95%CI: 0.66 to 0.77; I2 = 78.0%, Pheterogeneity < 0.001, random model) but also improved several CVD risk indicators. The cardioprotective effects of long-term PA have been confirmed by several studies. For example, an American cohort study that analyzed the effects of long-term PA in 88,140 adults found that the risk of CVD-specific death was 37 and 33% lower in participants who performed PA for 150–299 min and 1,500 min or more per week, respectively, compared with those who were inactive (48). Because of its large sample size, this study provides strong evidence supporting our meta-analysis results. For the mechanism by which PA reduces cardiovascular risk, one study suggests that PA improves cardiovascular health through the efficient use of energy-releasing raw materials (e.g., oxygen, fat, and glucose) and other resources, combined with autonomous skeletal muscle contraction that enhances metabolism and neural coordination (44). Furthermore, a large meta-analysis of RCTs showed that long-term PA significantly improved cardiopulmonary function and several CVD biomarkers (e.g., lipids) in healthy adults, which in turn reduced the incidence of CVD and improved cardiovascular health. To further explore the reasons for PA's effects on the risk of CVD, our study began by analyzing lipids because abnormalities in the lipoprotein–lipid profile account for 50% of the total risk of CVD (46); moreover, the assessment of lipid levels is the most common method to identify individuals at high risk of CVD (49). According to our study, long-term PA significantly reduced total TC, TGs, and LDL levels and significantly improved HDL levels. Other studies have shown that adults who engage in long-term PA have lower TC and LDL levels compared with those who are inactive (50, 51), these findings are consistent with our meta-analysis results. Furthermore, two longitudinal studies have demonstrated that TG levels are lower and HDL levels are higher in endurance athletes and in those with long-term aerobic training (52, 53). The more favorable lipid profiles in these populations may be due to an increase in lipoprotein lipase (LPL) mRNA, LPL mass, total LPL activity, and heparin-releasable LPL activity in the skeletal muscle after long-term PA (54). When the LPL concentration increases, the composition of lipoproteins changes in vivo, and apolipoprotein-E is redistributed. This change decreases plasma TG levels, LDL levels, and TC/HDL ratio and increases HDL concentrations (55, 56), thereby reducing the risk of CVD.
Furthermore, our study revealed significant improvements in BMI, blood pressure, and blood glucose in healthy adults who performed long-term PA, and these results have been widely confirmed. Several large RCTs have found that after more than 8 weeks of PA intervention, all participants had lower weight, blood pressure, and fasting glucose, and these effects were consistent for participants with different genders and weights as well as different types and intensities of PA (57–60). These improvements may be related to omentin-1, an adipokine that promotes insulin sensitivity; studies have shown that after long-term PA intervention, participants showed improvements in BMI, waist circumference, body fat, and blood glucose with a corresponding increase in their omentin-1 concentrations (61). Omentin-1 was present at lower concentrations in the obese population and was negatively correlated with BMI, fasting glucose, and blood pressure (62, 63). The concentration of omentin-1 in the body may have increased after the PA intervention, improving CVD-related outcomes.
In the subgroup analysis, we found that PA only significantly improved HDL when the intervention duration was longer than 12 weeks or the participants who were under 60 years of age. Shorter interventions may be insufficient to achieve observable improvements; moreover, the PA intensity may not reach the level needed for improvement in older adults because of their low exercise levels. In a previous study, a significant improvement in HDL was reported only after PA reached a certain intensity (64). We also observed a significant effect on HDL when people chose to perform AE or RE. Evidence shows that AE or RE alone can increase HDL levels (65), and the combination of AE and RE in ME can have the same effect (66); however, ME was not associated with significant changes in our study. This is likely because ME was mixed with other forms of exercise, such as balance exercises, and less evidence supports improvement in HDL with these forms of exercise; thus, the overall results may have been affected. Moreover, no significant differences were observed in terms of the effect of PA on HDL in the group with SB. This suggests that the beneficial effects of PA may be limited in people with SB; furthermore, a previous study showed that the effects of PA and SB were independent of each other (9). These findings warrant further investigation of the details of the interaction between PA and SB in future studies. In all other subgroup analyses, we obtained consistent results, indicating that the overall improvement in lipids levels was superior in participants who performed PA.
Our study has several implications in clinical practice and can provide guidance for practitioners. First, our findings support the American Heart Association (AHA) guidelines recommending long-term PA as a first-line treatment for improving dyslipidemia and reducing the risk of CVD (67). Therefore, 40 min of moderate to vigorous intensity aerobic exercise for three to four times per week is recommended to lower LDL and increase HDL (68). Second, our study found that PA also improved blood pressure levels, and according to the AHA guidelines, performing aerobic exercise three to four times a week for an average of 40 min per session for at least 12 weeks is a typical recommendation for improving blood pressure in adults (68). Third, according to our subgroup analysis, resistance training can also reduce the risk of CVD when performed at a recommended weekly training intensity of 500–1000 METs (69). In summary, patients should regularly engage in PA, and to maximize health benefits, they should perform at least 150 minutes of moderate-intensity aerobic exercise or 75 min of high-intensity aerobic exercise as well as two resistance training sessions per week (30).
Strengths and limitations
This study is the first to combine RCTs and longitudinal studies to examine the association between PA, SB, and CVD, contributing new medical evidence to the literature. We not only distinguished the population but also considered factors such as economic status, year of publication, and the number of participants, making this a more in-depth study than previous work. Because the volume of literature included in the previous meta-analysis was not very large, we collected studies from larger databases, resulting in a larger sample size meeting the inclusion criteria. The results of this study may provide more treatment options to policymakers, clinicians, and caregivers, and the findings may help guide decision-making and facilitate more in-depth research in the future.
The present study also has several limitations. First, the uneven quality of the literature on RCTs may have impacted the overall quality of the studies, and the high risk of outcome assessment blinding created some heterogeneity and imprecision in the study results. In addition, the inclusion of longitudinal studies and RCTs may have resulted in inconsistent results. Furthermore, we did not analyze certain confounding factors, such as diet, smoking, and obesity, because of inconsistencies in implementation criteria, dosing criteria, and rubrics, which may have contributed to limitations in the outcomes. Considering the above limitations, the study results should be interpreted with caution.
Conclusions
In conclusion, long-term SB increased the risk of CVD in healthy adults, whereas regular PA reduced the risk of CVD and improved indicators associated with CVD risk. However, improvement was limited in patients with SB, select ME and older age groups. Therefore, patients should be encouraged to limit their daily sitting time and increase their PA levels to reduce their risk of CVD. More detailed studies are needed to demonstrate and clarify the effects of PA and SB on CVD.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding authors.
Author contributions
Z-dL served as principal author and had full access to all the data in the study, takes responsibility for the accuracy of the data analysis, and the integrity of the data. Z-dL and MZ contributed to the conception, design, and drafting the manuscript. Z-dL, MZ, and C-zW contributed to data acquisition and interpretation. YY and J-hL contributed to revise of the article and final approval. All authors contributed to the article and approved the submitted version.
Funding
The work was supported by the National Natural Science Youth Foundation of China (No. 32000830) and the Special funding in China Postdoctoral Fund Station (No. 2021T140356).
Acknowledgments
We affirm that the work submitted for publication is original and has not been published other than as an abstract or preprint in any language or format and has not been submitted elsewhere for print or electronic publication consideration. We affirm that each person listed as authors participated in the Work in a substantive manner, in accordance with ICMJE authorship guidelines, and is prepared to take public responsibility for it. All authors consent to the investigation of any improprieties that may be alleged regarding the work. We appreciate the linguistic assistance provided by TopEdit (www.topeditsci.com) during the preparation of this manuscript.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Keywords: physical activity, meta-analysis, healthy adult, cardiovascular disease(s), sedentary behavior
Citation: Liang Z-d, Zhang M, Wang C-z, Yuan Y and Liang J-h (2022) Association between sedentary behavior, physical activity, and cardiovascular disease-related outcomes in adults—A meta-analysis and systematic review. Front. Public Health 10:1018460. doi: 10.3389/fpubh.2022.1018460
Received: 13 August 2022; Accepted: 26 September 2022;
Published: 19 October 2022.
Edited by:
Bojan Masanovic, University of Montenegro, MontenegroReviewed by:
Amir Reza Moravejolahkami, Isfahan University of Medical Sciences, IranMihnea-Alexandru Găman, Carol Davila University of Medicine and Pharmacy, Romania
Copyright © 2022 Liang, Zhang, Wang, Yuan and Liang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yang Yuan, yuanyangofficial@yeah.net; Jing-hong Liang, Liangjh78@mail2.sysu.edu.cn