The literature searches (first search and update) yielded a total of 14,429 search results. After de-duplication, 10,222 search results remained for title and abstract screening. Two hundred seventy-two articles were retrieved for full-text assessment, of which 215 were excluded. Reasons for exclusion are given in the PRISMA flow diagramme (figure 1), with the main reason for exclusion being that studies reported adjusted and multivariate statistical models but not their underlying bivariate associations (n=101). Finally included were 57 articles reporting on 54 primary studies (figure 1).
PRISMA 2020 flow diagram for new systematic reviews, including searches of databases and registers only
[insert Figure 1]
Figure 1. PRISMA flow diagram. From: Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ 2021;372:n71. doi: 10.1136/bmj.n71 (36). For more information, visit: http://www.prisma-statement.org/
Study characteristics
Study characteristics are summarised in table 2. The 54 included studies (37–93) were conducted in 23 countries, with the majority from North America (n=22), Europe (n=18) and Asia (n=10). Three studies were conducted in Oceania, one in South America, and there were no studies from African countries. Most studies had either an observational longitudinal design (n=28) or an observational cross-sectional design (n=25). One experimental study was included, from which only usual care control group data was extracted. Individual study sample sizes ranged from 25 to 3,128, with 17,639 study participants included in total. The global distribution of study participants is shown in figure 2.
[insert Figure 2]
Figure 2. Global distribution of study participants
The majority of study participants were male (54.6% to 100% male in 49 studies). The mean age of study samples ranged from 54 to 75 years, except for one study in patients with congenital heart disease with a mean age of 29 years. With regard to cardiac diagnoses, study samples represented either coronary heart disease across various degrees of severity (descriptors coronary heart disease and ascertained heart disease, n=19), specific groups such as bypass surgery, heart valve surgery, or heart transplantation (n=18), or a mix of cardiac conditions (descriptors cardiac rehabilitation and mixed cardiac diagnoses, n=17). The time point of data collection in relation to an acute cardiac event or in relation to a cardiac rehabilitation programme was up to 3 months in 18 studies, 3 to 6 months in 9 studies, 6 to 12 months in 7 studies, 12 to 24 months in 4 studies, over 24 months in 8 studies, and not reported in 8 studies (table 2).
Table 2. Study characteristics
Author
|
Country
|
Study design
|
Study population
|
N
|
Gender (% male)
|
Age (mean, SD)
|
Time-point/follow-upk
|
Ali 2017 (37)
|
Pakistan
|
Cross-sectional
|
Bypass surgery
|
265
|
59.2
|
67.2 (13.4)
|
Mean 5.7 (SD 1.3) weeks post surgery
|
Ali 2017 (38)
Ali 2018 (39)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
411
|
70.1
|
65.0 (10.4)
|
2 years after CR start
|
Alsaleh 2023 (82)
|
Jordan
|
Cross-sectional
|
Coronary heart diseasec
|
400
|
64.7
|
54.3 (8.9)
|
≥4 months after diagnosis
|
Arthur 2013 (78)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
203
|
0.0
|
63.1 (11.0)
|
12 months after CR completion
|
Bernardo 2013 (40)
|
Brazil
|
Cross-sectional
|
Cardiac rehabilitation
|
69
|
71.0
|
67.2 (9.2)
|
At CR start
|
Blanchard 2008 (41)
Blanchard 2009 (42)
|
Canada
|
Longitudinal
|
Ascertained heart diseasea
|
76
|
76.0
|
63.0 (11.0)
|
6 months after CR start
|
Blanchard 2010 (43)
Blanchard 2011 (44)
|
Canada
|
Longitudinal
|
Ascertained heart diseasea
|
280
|
72.5
|
63.0 (11.5)
|
3 months after CR start
|
Bray 2006 (45)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
44
|
63.6
|
59.4 (13.5)
|
6 weeks after CR completion
|
Chien 2014 (46)
|
Taiwan
|
Longitudinal
|
Heart failure
|
111
|
62.2
|
63.2 (11.5)
|
1 month after hospital discharge
|
Crane 2005 (47)
|
USA
|
Cross-sectional
|
Myocardial infarctionb
|
84
|
0.0
|
75.0 (5.8)
|
6-12 months after MI
|
Dąbek 2020 (48)
|
Poland
|
Cross-sectional
|
Coronary heart diseasec
|
217
|
56.7
|
67.4 (8.5)e
|
During hospitalisation
|
de Melo Ghisi 2015 (49)
|
Canada
|
Experimental
|
Cardiac rehabilitation
|
146
|
78.8
|
64.3 (12.0)
|
22-24 weeks after CR start
|
de Melo Ghisi 2015 (50)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
214
|
67.2
|
66.1 (9.3)
|
6 months after CR start
|
Dontje 2014 (51)
|
Netherlands
|
Cross-sectional
|
Heart failure
|
68
|
71.0
|
62.0 (14)
|
Stable outpatients recruited from HF clinicsl
|
Dunn 2018 (52)
|
USA
|
Longitudinal
|
Coronary heart diseasec
|
122
|
65.6
|
65.0 (9.1)
|
During hospitalisation
|
Esnaasharieh 2022 (83)
|
Iran
|
Cross-sectional
|
Heart Failure
|
103
|
59.2
|
55.9 (11.4)
|
Mean 7.2 (SD 5.0) years disease duration
|
Fahmi 2022 (84)
|
Indonesia
|
Cross-sectional
|
Post-treatment AMI
|
150
|
78.8
|
n.r.
|
Patients recruited from a cardiac clinicl
|
Foster 2021 (85)
|
Scotland
|
Cross-sectional
|
Cardiac rehabilitation
|
285
|
75.9
|
68.7 (10.5)
|
Patients referred to CRl
|
Funaki 2023 (86)
|
Japan
|
Longitudinal
|
Ascertained heart diseasea
|
577
|
86.5
|
64 (58 - 68)h
|
1 month after PCI
|
Goodwin 2019 (53)
|
USA
|
Cross-sectional
|
Acute coronary syndrome
|
151
|
69.5
|
64.0 (11.4)
|
35 days after hospital discharge
|
Holahan 2008 (54)
|
USA
|
Cross-sectional
|
Mixed cardiac diagnosesd
|
130
|
49.0
|
60.2 (12.4)
|
Outpatients recruited through medical settingsl
|
Huang 2022 (80)
|
Taiwan
|
Cross-sectional
|
Coronary heart diseasec
|
215
|
62.8
|
68.8 (10.8)
|
Mean 9.4 (SD 6.9) years disease duration
|
Kałka 2021 (87)
|
Poland
|
Cross-sectional
|
Coronary heart diseasec
|
751
|
100
|
59.5 (9.4)
|
After CR completion
|
Kanning 2010 (55)
|
Germany
|
Longitudinal
|
Coronary heart diseasec
|
108
|
91.0
|
55.0 (10.0)
|
6 months after CR completion
|
Kim 2022 (88)
|
USA
|
Longitudinal
|
Cardiac rehabilitation
|
25
|
64.0
|
64.6 (10.5)
|
9 months after CR completion
|
Klompstra 2018 (56)
|
Sweden
|
Cross-sectional
|
Heart Failure
|
100
|
62.0
|
67.0 (13.0)
|
Median 37 (range 2-192) months after diagnosis
|
Knapik 2019 (57)
|
Poland
|
Cross-sectional
|
Coronary heart diseasec
|
135
|
56.3
|
71.9 (4.8)
|
Stable CAD patients recruited from cardiology clinicl
|
Kronish 2006 (58)
|
USA
|
Longitudinal
|
Acute coronary syndrome
|
492
|
58.9
|
60.6 (12.2)
|
3 months after hospital discharge
|
Le Grande 2006 (59)
|
Australia
|
Longitudinal
|
Ascertained heart diseasea
|
200
|
74.0
|
59.0 (10.1)
|
6 months after PCI
|
Le Grande 2015 (60)
|
Australia
|
Longitudinal
|
Ascertained heart diseasea
|
133
|
84.0
|
60.0 (9.3)
|
6 weeks after hospital discharge
|
Liu 2022 (89)
|
China
|
Cross-sectional
|
Ascertained heart diseasea
|
260
|
65.8
|
57.2 (9.6)
|
>1 year after PCI
|
Lund 2016 (61)
|
Denmark
|
Longitudinal
|
Heart valve surgery
|
524
|
64.7
|
70.0f
|
6-12 months after surgery
|
Luszczynska 2006 (62)
|
Poland
|
Longitudinal
|
Myocardial infarctionb
|
114
|
64.0
|
54.3 (7.0)
|
8 months after MI
|
Marques-Sule 2022 (79)
|
Spain
|
Cross-sectional
|
Heart transplantation
|
117
|
56.4
|
56.0 (12.1)
|
Mean 79.5 (SD 65.6) months since transplantation
|
Millen 2008 (63)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
50
|
62.0
|
62.0 (13.0)
|
12 weeks after CR completion
|
Murray 2012 (64)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
129
|
85.3
|
59.5 (10.3)
|
1 month after CR completion
|
Peersen 2020 (65)
|
Norway
|
Cross-sectional
|
Ascertained heart diseasea
|
1101
|
79.2
|
62.0 (10.0)
|
Median 16 (range 2-36) months after cardiac event
|
Peláez 2010 (66)
|
Canada
|
Cross-sectional
|
Coronary heart diseasec
|
756
|
69.0
|
60.0 (10.0)
|
Patients at a tertiary care cardiac centerl
|
Prapavessis 2005 (67)
|
New Zealand
|
Cross-sectional
|
Congenital heart disease
|
64
|
47.0
|
28.8 (9.9)
|
Surgical repair of cardiac defect in childhood
|
Racodon 2020 (68)
|
France
|
Cross-sectional
|
Cardiac rehabilitation
|
100
|
76.0
|
59.9 (10.5)
|
1 year after CR completion
|
Rodgers 2013 (69)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
114
|
78.1
|
57.6 (9.8)
|
1 month after CR completion
|
Russell 2009 (70)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
68
|
86.8
|
64.9 (8.9)
|
6 weeks after CR completion
|
Russell 2010 (71)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
53
|
100
|
62.8 (10.8)
|
2 weeks after CR completion
|
Salman 2019 (72)
|
Scotland
|
Cross-sectional
|
Mixed cardiac diagnosesd
|
3128
|
49.4
|
63.3f
|
Patients recruited by surveyl
|
Schmitz 2022 (90)
|
Germany
|
Longitudinal
|
Psycho-Cardiological rehabilitation
|
164
|
54.6
|
54.6 (7.5)
|
6 months after CR completion
|
Setny 2022 (91)
|
Poland
|
Longitudinal
|
Acute coronary syndrome
|
1003i
|
71.0j
|
64.5g(8.0)e
|
6-24 months after cardiac event
|
Slovinec D'Angelo 2014 (73)
|
Canada
|
Longitudinal
|
Ascertained heart diseasea
|
801
|
75.4
|
61.4 (10.0)
|
12 months after hopitalisation
|
Sweet 2014 (74)
|
Canada
|
Longitudinal
|
Cardiac rehabilitation
|
109
|
68.0
|
62.3 (9.6)
|
4 months after CR start
|
Teleki 2022 (92)
|
Hungary
|
Longitudinal
|
Ascertained heart diseasea
|
117
|
66.0
|
62.5 (6.2)
|
6 months after hospital discharge
|
Tokunaga-Nakawatase 2012 (75)
|
Japan
|
Longitudinal
|
Coronary heart diseasec
|
76
|
100
|
67.0 (7.8)
|
Patients recruited from an outpatient clinicl
|
Van Der Wal 2006 (76)
|
Netherlands
|
Cross-sectional
|
Heart failure
|
501
|
60.0
|
72.0 (11.0)
|
Median 40 (IQR 11-79) months of HF symptoms
|
Wang 2023 (93)
|
China
|
Longitudinal
|
Coronary heart diseasec
|
279
|
63.0
|
64.7 (13.2)
|
1 week after hospital discharge
|
Werren 2022 (81)
|
Italy
|
Cross-sectional
|
Acute coronary syndrome
|
372
|
86.3j
|
65.4gf
|
Median 31 (IQR 24 – 38) months after CR start
|
Zullo 2010 (77)
|
USA
|
Cross-sectional
|
Myocardial infarctionb
|
1374
|
53.0
|
64.4 (12.1)e
|
≤10 years after MI
|
a includes post-myocardial infarction, percutaneous coronary intervention, coronary artery bypass grafting
b includes STEMI and NSTEMI
c includes descriptors coronary artery disease, ischemic heart disease, and stable coronary heart disease
d includes patients with a variety of cardiac diagnoses but not recruited from a cardiac rehabilitation programme
e SD calculated by authors
f SD not reported
g weighted mean calculated by authors
h median reported
i sample size calculated by authors
j percentage calculated by authors
k if a longitudinal study, furthest time point of physical activity measurement chosen
l time since cardiac event not reported
AMI, acute myocardial infarction
MI, myocardial infarction
CR, cardiac rehabilitation
HF, heart failure
CAD, coronary artery disease
PCI, percutaneous coronary intervention
SD, standard deviation
IQR, interquartile range
|
Methodological quality assessment
Twenty nine studies were rated good quality and 25 studies fair quality. There were no study exclusions because of poor methodological quality. Individual quality ratings for all included studies are given in a supplementary table, see Additional file 4.
It is notable that for the majority of studies a statistical sample size justification was not conducted (n=34) or not reported (n=5), which lowers statistical confidence in accuracy of parameter estimates being taken into account during study design. A large number of studies did not measure the exposure (determinant) prior to the outcome (n=22) or more than once over time (n=24). For some types of determinants this might weaken the interpretation of direction of causality, but not necessarily for all types of determinants (e.g., for modifiable cognitive factors such as self-efficacy a concurrent temporal association is appropriate). The assessment item concerning measurement and statistical adjustment for potential confounding variables was considered not applicable throughout, because this systematic review sought to extract bivariate (unadjusted) association data only.
With regard to risk of bias, it is noted that 26 studies did not report on the participation rate of eligible persons, and 13 studies reported a loss to follow-up of more than 20%, which raises the possibility of selection bias in these studies. Masking of outcome assessors was not conducted in 16 studies in which masking would have been feasible within their study designs, indicating the possibility of observer bias in these studies.
Physical activity behaviour
The majority of studies measured PA behaviour based on self-reported questionnaires (n=49), one study (75) employed both a self-reported questionnaire and a wearable sensor device (pedometer), and four studies (51,53,86,88) used wearable sensor devices (accelerometers) only.
Of those studies using self-reported questionnaires, eleven studies (48,61,68,75,79,82,84,85,89,90,93) employed the International Physical Activity Questionnaire (IPAQ) (94), thirteen studies (38,39,41–44,50,64,67,69,73,74,78) the Godin Leisure-Time Exercise Questionnaire (GLTEQ) (95), three studies (66,70,71) the 7-Day Physical Activity Recall (PAR) (96,97), and three studies (45,63,80) the Physical Activity Scale for the Elderly (PASE) (98).The following questionnaires were used in one study each: the Baecke Physical Activity Questionnaire (40), the Active Australia Survey (60), a revised version of the Heart Failure Compliance Scale (76), the Allied Dunbar National Fitness Survey (72), the Nord-Trøndelag Health Study questionnaire (65), the Behavioural Risk Factor Surveillance questionnaire (47), the German Freiburger questionnaire (55), the Rapid Asssessment of Physical Activity (RAPA) questionnaire (83), the Health Action Process Approach Scale (92), and the Daily Activity Questionnaire in Heart Failure Scale (DAQIHF)(46). Thirteen studies (37,49,52,54,56–59,62,77,81,87,91) collected PA data from self-designed or adapted questionnaires.
Collectively, these different methods of measuring the outcome PA behaviour capture activities such as walking, cycling, housework, gardeninig, exercise and training, including indoors, outdoors, leisure and work-related physical activities. The units of measurements include amount of light, moderate, and/or vigorous PA (minutes and hours per week), metabolic equivalents of tasks (METs), weekly frequency of exercise, step counts, or instrument-specific scores. In several studies, participants were dichotomised into those meeting the PA recommendations versus those not meeting the PA recommendations. The specific units of measurement for each included study are given in a supplementary file, see Additional File 5.
Determinants of physical activity behaviour
The 54 studies included in this review yielded 545 bivariate association statistics between various determinants and PA behaviour. Most determinants were self-reported, except for clinical measurements and demographic determinants which were mainly extracted from medical records. Determinants represent 17 overarching categories (factors) and 51 sub-categories mapped to the OPTImAL ontology (table 3). Most data were mapped to the overarching determinant categories cognitive factors (27.3%), demographic factors (18.2%), and psychological factors (12.0%). All other overarching determinant categories inlcude between 0.2% and 7.0% of data. The sub-categories for which most data could be extracted were self-efficacy (12.5%), social support (6.1%), exercise behaviour (5.7%), motivation (5.1%), age (5.1%), comorbidity (4.8%), emotion (4.8%), gender (4.4%), education (4.0%), and psychological wellbeing (4.0%), with all other sub-categories ranging between 0.2% and 2.9% (table 3).
Table 3. Categories of the OPTImAL ontology for which bivariate association statistics (N=543) were extracted.
Overarching category (factor)
|
Number of extracted association statistics (n, %)
|
Sub-category (determinant)
|
Number of extracted association statistics (n, %)
|
Anthropometric factors
|
13 (2.4%)
|
Body mass index
|
13 (2.4%)
|
Cardiovascular disease factors
|
17 (3.1%)
|
Cardiovascular risk score
|
4 (0.7%)
|
|
|
NYHA class
|
7 (1.3%)
|
|
|
History of heart disease
|
6 (1.1%)
|
Cognitive factors
|
148 (27.2%)
|
Self-efficacy
|
68 (12.5%)
|
|
|
Self-regulation / monitoring
|
6 (1.1%)
|
|
|
Motivation / exercise motivation
|
28 (5.1%)
|
|
|
Life attitude
|
13 (2.4%)
|
|
|
Subjective norm
|
5 (0.9%)
|
|
|
Intention
|
10 (1.8%)
|
|
|
Illness perception
|
5 (0.9%)
|
|
|
Health belief
|
2 (0.4%)
|
|
|
Exercise belief
|
11 (2.0%)
|
Morbidity factors
|
26 (4.8%)
|
Comorbidity
|
26 (4.8%)
|
Demographic factors
|
99 (18.2%)
|
Age
|
28 (5.1%)
|
|
|
Education
|
22 (4.0%)
|
|
|
Ethnicity
|
7 (1.3%)
|
|
|
Gender
|
24 (4.4%)
|
|
|
Marital status
|
13 (2.4%)
|
|
|
Socioeconomic status
|
5 (0.9%)
|
Environment factors
|
27 (5.3%)
|
Physical environment
|
4 (0.7%)
|
|
|
Weather
|
8 (1.5%)
|
|
|
Residence
|
3 (0.6%)
|
|
|
Transport
|
4 (0.7%)
|
|
|
Living arrangements
|
9 (1.7%)
|
|
|
Home exercise equipment
|
1 (0.2%)
|
Health behaviour factors
|
38 (7.0%)
|
Exercise behaviour
|
31 (5.7%)
|
|
|
Habit formation
|
6 (1.1%)
|
|
|
Patient activation
|
1 (0.2%)
|
Healthcare service factors
|
20 (3.7%)
|
Exercise recommendation
|
2 (0.4%)
|
|
|
Cardiac rehabilitation attendance
|
15 (2.8%)
|
|
|
Access to care
|
1 (0.2%)
|
|
|
Treatment
|
2 (0.4%)
|
Health literacy factors
|
8 (1.5%)
|
Knowledge / information
|
8 (1.5%)
|
Insurance factors
|
1 (0.2%)
|
Insurance
|
1 (0.2%)
|
Lab test
|
2 (0.4%)
|
Lipid profile
|
2 (0.4%)
|
Lifestyle factors
|
11 (2.0%)
|
Smoking
|
7 (1.3%)
|
|
|
Alcohol
|
1 (0.2%)
|
|
|
Stress
|
1 (0.2%)
|
|
|
Lack of time
|
2 (0.4%)
|
Patient physiology factors
|
8 (1.5%)
|
Arterial hypertension
|
2 (0.4%)
|
|
|
Left ventriular ejection fraction
|
6 (1.1%)
|
Symptom factors
|
9 (1.7%)
|
Fatigue / sleepiness
|
9 (1.7%)
|
Social support factors
|
33 (6.1%)
|
Social support
|
33 (6.1%)
|
Psychological factors
|
65 (11.9%)
|
Loneliness
|
1 (0.2%)
|
|
|
Emotion
|
26 (4.8%)
|
|
|
Depression
|
16 (2.9%)
|
|
|
Psychological well-being
|
22 (4.0%)
|
Social environment factors
|
18 (3.3%)
|
Family circumstances
|
4 (0.7%)
|
|
|
Dog ownership / dog walking
|
2 (0.4%)
|
|
|
Employment
|
12 (2.2%)
|
Details of all extracted association statistics are given in online supplement, under Additional File 5. Figure 3 presents a descriptive graphical summary of all bivariate association statistics. For each determinant sub-category, this allows a visual comparison of the relative amount of data (number of bivariate association statistics and number of studies from which these were extracted) and the directions and strengths of associations (excluding those associations which were categorised as 'none').
Out of the 51 determinant sub-categories, 26 (51.0%) showed predominantly positive associations with PA behaviour, 11 (21.7%) showed predominantly negative associations, 8 (15.7%) showed mixed positive and negative associations, and for 6 (11.8%) determinant sub-categories all associations were categorised as 'none'.
Out of those determinants which were associated predominantly positively with PA behaviour, self-efficacy, life attitude, intention for PA, exercise belief, education, weather, (prior) exercise behaviour, habit formation, social support, psychological wellbeing and employment provide the strongest indicators, based on the number of respective association statistics and the distribution of strengths of associations. Self-efficacy represents by far the strongest indicator (30 weak, 29 moderate, 3 strong and 1 very strong positive associations as compared to only 5 associations which were categorised as 'none'), followed by exercise behaviour (9 weak, 14 moderate, 3 strong, and 2 very strong positive associations as compared to only 3 associations which were categorised as 'none') and social support (16 weak, 6 moderate, and 1 strong positive associations as compared to 2 weak negative associations and 8 associations which were categorised as 'none'). The remaining determinants which were also associated positively with PA behaviour were self-regulation, subjective norm, illness perception, health belief, socioeconomic status, physical environment, transport (i.e., availability of transportation), home exercise equipment, patient activation, treatment, knowledge, insurance, lipid profile, occurrence of CVD in the family, and dog ownership (figure 3).
The determinants which were associated predominantly negatively with PA behaviour are New York Heart Association (NYHA) class, history of heart disease, comorbidity, age, smoking, alcohol, lack of time, fatigue, loneliness, emotion and depression. Out of these, the strongest indicators were age (12 weak, 5 moderate, 1 strong, and 1 very strong negative associations as compared to 1 weak positive association and 8 associations which were categorised as 'none'), emotion (6 weak, 3 moderate, 6 strong and 1 very strong negative associations as compared to 10 associations which were categorised as 'none'), and comorbidity (15 weak negative associations as compared to 2 weak positive associations and 9 associations which were categorised as 'none'); followed by NYHA class (5 weak, 1 moderate, and 1 strong negative associations), depression (5 weak, 2 moderate and 1 strong negative associations as compared to 1 moderate positive association and 7 associations which were categorised as 'none'), and fatigue (3 weak, 2 moderate and 1 strong negative associations as compared to 3 associations which were categorised as 'none') (figure 3).
The determinants which showed mixed associations were body mass index, motivation, ethnicity, gender, marital status, living arrangements, cardiac rehabilitation attendance, and left ventricular ejection fraction. The determinants for which all associations were categorised as 'none' include cardiovascular risk score, residence, exercise recommendation, access to care, stress, and arterial hypertension (figure 3).
[insert Figure 3]
Figure 3. Associations for 51 determinants of physical activity behaviour. Shown are the number, direction and strength of associations, and the number of studies from which association statistics were extracted for each determinant.