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Table S1. Systematic literature review search terms and strategy
Search terms for PubMed
#1 ("motor Activity" [Mesh] OR "exercise" [Mesh] OR "physical activity"
[Title/Abstract] OR "physical activities" [Title/Abstract] OR "exercise"
[Title/Abstract] OR "exercises" [Title/Abstract])
#2 ("Cohort Studies"[Mesh] OR cohort [Title/Abstract] OR prospective
[Title/Abstract] OR longitudinal [Title/Abstract])
#3 ("Metabolic Syndrome X"[Mesh] OR “metabolic syndrome” [Title/Abstract] OR
“syndrome X” [Title/Abstract] OR “insulin resistance syndrome” [Title/Abstract]
OR MetS [Title/Abstract])
#1 AND #2 AND #3
Search terms for Embase
#1 exercise/ OR physical activity/ OR "physical activity" mp. OR "physical
activities" mp. OR "exercise" mp. OR "exercises" mp.
#2 cohort analysis/ OR prospective study/ OR longitudinal study/ OR cohort mp.
OR prospective mp. OR longitudinal mp.
#3 metabolic syndrome X/ OR “Metabolic Syndrome X” mp. OR “metabolic
syndrome” mp. OR “syndrome X” mp. OR “insulin resistance syndrome” mp. OR
MetS mp.
#1 AND #2 AND #3
Table S2. Meta-analysis of leisure-time physical activity (LTPA) and metabolic
syndrome: list of excluded studies and exclusion reason
Exclusion reason Reference number
Cross-sectional study or trials (n=19) [1-19]
Not relevant exposure (n=64) [20-83]
Not relevant outcome (n=8) [84-91]
Repeated publication on already included cohort (n=1) [92]
Insufficiently defined PA exposure categories (n=6) [93-98]
Could not obtain the full text (n=3) [99-101]
Could not obtain the required data (n=16) [102-117]
Reviews or meta-analysis (n=5) [118-122]
Other language (n=3) [123-125]
conference article or abstract (n=2) [126, 127]
Table S3. Summary of metabolic equivalent of task (MET) h/week dose-assignment calculations for the cohort studies included in the
dose–response meta-analysis
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
Kim et al. Non-exerciser (0 kcal/kg/wk) 0 Conversion from EE/ wk to
MET h/wk according to the
following formula: LTPA
EE/wk/weight (kg)=LTPA
MET h/wk
Low-moderate (15 kcal/kg/wk) 7.5
High (>15 kcal/kg/wk) 22.5
Kuwahara et al. No exercise (0 MET h/wk) 0
Very low (0-3.75 MET h/wk) 1.875
Low (3.75-7.5 MET h/wk) 5.625
Medium (7.5-16.5 MET h/wk) 12
High (16.5-25.5 MET h/wk) 21
Very high (≥25.5 MET h/wk) 30
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
Pham et al. Low (<10 MET h/wk)
Moderate (10-20 MET h/wk)
5
15
High (>20 MET h/wk) 25
Chen et al. No exercise: 0 At least 30 min (45
min/session)
MVPA=4.5 MET 0
Insufficient: 0-3
times/wk (1.5)
5.0625
Recommended: ≥3
times/wk (4.5)
15.1875
Bell et al. Low (0-1.50 h/wk)
(0.75)
≥3 MET (4.5 MET) 3.375
Intermediate (1.56-
4.25 h/wk) (2.905)
13.0725
High (4.27-20.56
h/wk) (12.415)
55.8675
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
Wennberg et al. Daily (7x/wk) 45 min/session MVPA=4.5 MET 23.625
Several times/wk
(3.5x/wk)
11.8125
Once a week (1x/wk) 3.375
Several times/month or
less (0.5x/wk)
1.6875
Laursen et al. Sedentary: sedentary
or LPA (eg, slow
walking/biking, light
gardening work) <2
h/wk (1 h)
LPA=3 MET
3
Light: LPA 2–4 h/wk
(3 h)
LPA=3MET 9
Moderate+high:
moderate: LPA>4
MPA=4 MET 20
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
h/wk or 2–4 h/wk of
vigorous PA; high:
more than 4 h/wk of
moderate PA or
regular heavy
exercise or
competitive sports
several times per
week (5 h)
Puustinen et al. Low activity: 1–2
times/month (0.5x/wk)
at least 30 min per
session (45
min/session)
MVPA=4.5 MET 1.6875
Moderate activity: 1–3
times/wk (2x/wk)
6.75
High activity: >3 16.875
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
times/wk (5x/wk)
Ingelsson et al. Sedentary: spend most
of reading, or engaging
in other mostly
sedentary activities
0 Physical activity information
source:[128]
Moderate: often go
walking or cycling for
pleasure (4x/wk)
45 min/session MPA=4 MET 12
Regular: engage in any
active recreational
sports for at least 3 h
every week
at least 3 h every
week (4.5 h)
MVPA=4.5 MET 20.25
Athletic: regularly
engage in hard physical
training or competitive
45 min/session VPA=8 MET 24
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
sport (4x/wk)
Hsiao et al. None/mild: < 1 h of
exercise/wk
(0.5 h/wk)
MVPA = 4.5 MET 2.25
Moderate: 1–3 h of
exercise/wk (2 h/wk)
9
Vigorous: > 3 h of
exercise/wk (4 h/wk)
18
Wilsgaard et al. Sedentary: reading or
other sedentary
activity
0 0 Physical activity information
source:
[http://tromsoundersokelsen.u
it.no/tromso/]
Moderate: walking,
cycling at least 4 h a
week?
MPA = 4.0 MET 20
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
(5 h/wk)
Regular training:
participation in
recreational sports,
(duration of activity
at least 4 hr/wk (5
h/wk)
MVPA = 4.5 MET 22.5
Hard training:
participation in hard
training, regularly
several times a week?
(4 times/wk)
45 min/session VPA=8 MET 24
Holme et al. Sedentary: reading,
or other sedentary
activity
0 0
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
Moderate: walking,
cycling, or other
forms of exercise at
least 4 h a week? (5
h/wk)
MPA = 4.0 MET 20
Moderately vigorous:
exercise, sports,
heavy gardening and
similar activities
totaling at least 4
h/wk
(5 h/wk)
MVPA = 4.5 MET 22.5
Vigorous: hard training
or sports competitions,
regularly several times
45 min/session VPA=8 MET 24
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
a week? (4 times/wk)
Carnethon et al. 5 sessions of 300 kcal of
energy expenditure weekly
19.69 Conversion from EE/wk to
MET h/wk according to the
following formula:
LTPA EE/wk/76.19=LTPA
MET h/wk
weight information source:
[129]
Palaniappan et
al.
2,709 kcal /kg/year 52 Physical activity information
source: [130]
Laaksonen et al. <270 min/wk (162
min/wk)
6 MET 16.2
270-486 min/wk
(378 min/wk)
37.8
≥487 min/wk (595 59.5
Study Frequency Duration Intensity Assigned
MET h/wk
Additional information
min/wk)
MET h/wk doses were assigned from descriptions identified within the individual studies.
wk, week; EE: energy expenditure (in kcal); MET: metabolic equivalent of task; MET unit accounting for the individual basal metabolic rate;
LPA: light physical activity; MPA: moderate physical activity; MVPA: moderate to vigorous physical activity; VPA: vigorous physical activity;
Black font: Reported PA duration, frequency or intensity; Red: Assumed; Green: Calculated; Blue: Data received upon correspondence with the
authors.
Table S4 Summary of sensitivity analysis dose-assignment calculations for the prospective cohort studies included
in the dose-response meta-analysis
AuthorScenario A: Assigned
MET h/week
Scenario B: Assigned
MMET h/week
Scenario C: Assigned
MET h/week
Scenario D: Assigned
MMET h/week
Hidalgo-Santamaria
et al.17.3 13.46 17.3 13.46
32 24.89 32 24.89
49.4 38.42 49.4 38.42
76 59.11 76 59.11
Kim et al. 0 0 0 0
7.5 5.83 7.5 5.83
22.5 17.5 22.5 17.5
Kuwahara et al. 0 0 0 0
1.875 1.46 1.875 1.46
5.625 4.375 5.625 4.375
12 9.33 12 9.33
21 16.33 21 16.33
Pham et al. 5 3.89 5 3.89
15 11.67 15 11.67
25 19.44 25 19.44
Chen et al. 0 0 0 0
5.0625 3.9375 5.0625 3.9375
15.1875 11.8125 15.1875 11.8125
Bell et al. 3.375 2.625 3.375 2.625
13.0725 10.1675 13.0725 10.1675
55.8675 43.4525 55.8675 43.4525
Wennberg et al. 23.625 18.375 15.75 12.25
11.8125 9.1875 7.875 6.125
3.375 2.625 2.25 1.75
1.6875 1.3125 1.125 0.875
Laursen et al. 3 2 3 2
9 6 9 6
20 15 20 15
Puustinen et al. 1.6875 1.3125 1.6875 1.3125
6.75 5.25 6.75 5.25
16.875 13.125 16.875 13.125
Ingelsson et al. 0 0 0 0
12 9 8 6
20.25 15.75 20.25 15.75
24 21 16 14
Hsiao et al. 2.25 1.75 2.25 1.75
9 7 9 7
18 14 18 14
Wilsgaard et al. 0 0 0 0
20 15 20 15
22.5 17.5 22.5 17.5
24 21 16 14
Holme et al. 0 0 0 0
20 15 20 15
22.5 17.5 22.5 17.5
24 21 16 14
Carnethon et al 19.69 15.31 19.69 15.31
Palaniappan et al. 52 40.44 52 40.44
Laaksonen et al. 0 0 0 0
12 9 8 6
20.25 15.75 20.25 15.75
24 21 16 14
Scenario A: Session duration: 45 min Intensity: LPA= 3 MET/h; MPA=4 MET/h; MVPA = 4.5 MET/h; VPA= 8 MET/hScenario B: Session duration: 45 min Intensity: LPA= 2 MMET/h; MPA=3 MMET/h; MVPA = 3.5 MMET/h; VPA= 7 MMET/hScenario C: Session duration: 30 min Intensity: LPA= 3 MET/h; MPA=4 MET/h; MVPA = 4.5 MET/h; VPA= 8 MET/hScenario D: Session duration: 30 min Intensity: LPA= 2 MMET/h; MPA=3 MMET/h; MVPA = 3.5 MMET/h; VPA= 7 MMET/hMET: metabolic equivalent of task; MMET unit of marginalized PA (by subtracting the individual basal metabolic rate); LPA: light physical
activity; MPA: moderate physical activity; MVPA: moderate to vigorous physical activity; VPA: vigorous physical activity; Green: Calculated;
Blue: Data received upon correspondence with the authors.
Table S5. Summary of the characteristics of included studies investigating the association of level of LTPA and incident MetS
Author, year,
country/region
Follow-up
(year)
Sex Age
(years)
Cohort
size
PA exposure (dose*
in MET h/week)
ORs/RRs/HRs Covariates NOS
Hidalgo-
Santamaria et al,
2016, Spain
6 M/W 36.4 10114 Q1 (17.3)
Q2 (32.0)
Q3 (49.4)
Q4 (76.0)
1
0.79 (0.59-1.06)
0.80 (0.59-1.08)
0.63 (0.44-0.89)
age, sex, smoking, baseline
BMI, total energy intake,
adherence to the Mediterranean
diet, following any special diet,
snacking, sugar-sweetened soda
consumption, alcohol, French
fries consumption, fast-food
consumption, education,
computer use, TV watching,
house chores, sleeping, napping,
physical activity at work,
prevalence of cardiovascular
disease and cancer
8
Kim et al, 2016, 4 W 45.01 1228 non-exercise (0) 1.55 (1.14-2.13) study point, age, education, 7
Korea (3.02) low, moderate (7.5)
high (22.5)
1.02 (0.70-1.50)
1
religion, marital status,
employment, monthly income,
BMI, alcohol, ever smoking,
indirect smoking, exercise level,
eats breakfast, menopausal status
Kuwahara et al,
2016, Japan
4.1 M/W 45.1 22383 no exercise (0)
very low (1.875)
low (5.625)
medium (12)
high (21)
very high (30)
1
1.01 (0.91-1.13)
0.94 (0.85-1.04)
0.91 (0.84-0.99)
0.88 (0.77-1.00)
0.88 (0.77-1.01)
age, sex, shift work, sleep
duration, alcohol consumption,
smoking, occupational activity,
walking for commuting to and
from work, and BMI (category)
9
Pham et al, 2015,
Canada
1.1 M/W 51 (15) 4821 low (5)
moderate (15)
high (25)
1
0.79 (0.65–0.97)
0.57 (0.45–0.71)
sex, age, baseline 25(OHD),
changes in 25(OH)D during
follow up compared with
baseline, baseline metabolic
syndrome, season at baseline,
season at follow up, tobacco
4
smoking status, alcohol drinking
status, physical activity change
during follow up
Chen et al, 2015,
China
1 M/W > 65 388 no exercise (0)
insufficient (5.0625)
recommended
(15.1875)
1.84 (0.96-3.52)
0.84 (0.50-1.43)
1
age group, smoke, alcohol,
insomnia, sedentary time,
exercise, body fatness, balance,
hand grip strength, waist
circumference, SBP/DBP, HDL-
C, FG, TG at baseline.
6
Bell et al, 2014,
Britain
10 M/W 55.5 (6) 2254 low (3.375)
intermediate
(13.0725)
High (55.8675)
1
0.76 (0.60-0.95)
0.85 (0.67-1.07)
age, sex, ethnicity, occupational
position, frequency of fruit and
vegetable consumption, smoking
status, alcohol consumption and
the presence of a long-standing
illness, leisure time sitting level
7
Wennberg et al,
2013, Sweden
27 M/W 43 869 daily (23.625)
several times/week
1
1.32 (0.67–1.59)
TV viewing, sex, socioeconomic
disadvantage, family history of
9
(11.8125)
once a week (3.375)
several times/month
or less (1.6875)
1.55 (0.77–3.12)
1.82 (0.88–3.77)
diabetes, BMI, intake of
sweets/pastries, alcohol
consumption, smoking, and TV
viewing at age 16 years, physical
activity at age 43 years
Laursen et al, 2012,
Denmark
10 M/W 51.9 3968 sedentary (3)
light (9)
moderate+high (20)
1
0.99 (0.71-1.38)
0.71 (0.50-1.01)
jogging, walking speed and
volume, alcohol, smoking,
income, duration of schooling,
education, cohabitation and age
8
Puustinen et al,
2011, Finland
6.4 M/W 45.6 466 low (1.6875)
moderate (6.75)
high (16.875)
0.97 (0.44–2.14)
1.26 (0.75–2.13)
1
psychological distress, age,
gender, socioeconomic status,
smoking, use of alcohol, leisure
time physical activity, high-
sensitivity C-reactive protein
8
Ingelsson et al,
2009, Sweden
20 M 50 862 sedentary (0)
moderate (12)
regular (20.25)
1
0.60 (0.31–1.19)
0.65 (0.34–1.25)
BMI, age at baseline and follow-
up examinations, triglycerides,
systolic and diastolic blood
9
athletic (24) 0.45 (0.13–1.57) pressure, hypertension treatment,
fasting glucose, and erythrocyte
sedimentation rate, and HDL
cholesterol and HOMA-IR
Hsiao et al, 2010,
China
2 M/W 43.3 450 none/mild (2.25)
moderate (9)
vigorous (18)
3.41(1.03-11.32)
2.07 (0.53-8.11)
1
age, sex, BMI, FEV1, alcohol
drinking, smoking
7
Wilsgaard et al,
2008, Norway
13.8 M NA 8536 sedentary (0)
moderate (20)
regular training
(22.5)
hard training (24)
1
0.93 (0.79, 1.09)
0.75 (0.62, 0.90)
0.58 (0.41, 0.82)
age, baseline examination,
alcohol, coffee consumption,
smoking, education
7
Wilsgaard et al,
2008, Norway
13.8 W NA 8463 sedentary (0)
moderate (20)
regular training
(22.5)
hard training (24)
1
0.97 (0.82, 1.15)
0.68 (0.51, 0.90)
0.51 (0.16, 1.60)
age, baseline examination,
alcohol, coffee consumption,
smoking, education
7
Holme et al, 2007,
Norway
28 M 40-49 6379 sedentary (0)
moderate (20)
moderately vigorous
(22.5)
vigorous (24)
1
0.98 (0.83–1.17)
0.83 (0.67–1.02)
0.73 (0.44–1.22)
age, education, smoking,
glucose, triglycerides, body
mass index, treated hypertension
and systolic blood pressure
8
Carnethon et al,
2004, America
13.6 M 24.83 1869 per 297 EU (19.69) 0.95 (0.84, 1.09) age, race, education, BMI,
smoking, alcohol, carbohydrate
intake, crude fiber, total fat
intake
9
Carnethon et al,
2004, America
13.6 W 24.94 2323 per 298 EU (19.69) 1.02 (0.87, 1.20) age, race, education, BMI,
smoking, alcohol, carbohydrate
intake, crude fiber, total fat
intake
9
Palaniappan et al,
2004, America
5 M/W 54.4 714 per 2709kcal/kg/year
(52)
1.0 (0.8–1.2) age, sex, study site, ethnicity,
and IGT status
8
Laaksonen et al,
2002, Finland
4 M 51.2 612 <270 min/week
(16.2)
1
0.83 (0.45-1.52)
age, BMI, waist-to-hip ratio, use
of antihypertensive medications,
9
270-486 min/week
(37.8)
≥487 min/week
(59.5)
0.54 (0.28-1.04) systolic and diastolic blood
pressure, HDL, triglycerides,
insulin, glucose levels, and
family history of diabetes*Full details of MET h dose assignment are in Table S3;
PA: physical activity; LTPA: leisure-time physical activity; MET h/wk: metabolic equivalent of task (MET) h/week; M: men; W: women; NA:
not applicable; OR: odds ratio; RR: relative risk; HR: hazard ratio; NOS: Newcastle-Ottawa Scale; BMI, body mass index; FG, fasting glucose;
SBP, systolic blood pressure; DBP, diastolic blood pressure; TG, triglycerides; HDL, high-density lipoprotein; IGT, impaired glucose tolerance;
HOMA-IR, homeostasis model assessment insulin resistance index
Table S6. Quality assessment of the included cohort studies
Author
(Publication Year)
Newcastle-Ottawa Scale
Selection Comparability OutcomeTotal
1a 2b 3c 4d 5e 6f 7g 8h 9i
Hidalgo-Santamaria et al. (2016) 1 1 1 1 1 1 0 1 1 8
Kim et al. (2016) 0 1 1 0 1 1 1 1 1 7
Kuwahara et al. (2016) 1 1 1 1 1 1 1 1 1 9
Pham et al. (2015) 0 1 1 0 1 0 1 0 0 4
Chen et al. (2015) 0 1 1 1 1 0 1 0 1 6
Bell et al. (2014) 0 1 1 1 1 0 1 1 1 7
Wennberg et al. (2013) 1 1 1 1 1 1 1 1 1 9
Laursen et al. (2012) 1 1 1 1 1 0 1 1 1 8
Puustinen et al. (2011) 1 1 1 1 1 0 1 1 1 8
Hsiao et al. (2010) 0 1 1 1 1 1 1 0 1 7
Author
(Publication Year)
Newcastle-Ottawa Scale
Selection Comparability OutcomeTotal
1a 2b 3c 4d 5e 6f 7g 8h 9i
Ingelsson et al. (2009) 1 1 1 1 1 1 1 1 1 9
Wilsgaard et al. (2008) 1 1 0 1 1 0 1 1 1 7
Holme et al. (2007) 1 1 1 0 1 1 1 1 1 8
Carnethon et al. (2004) 1 1 1 1 1 1 1 1 1 9
Palaniappan et al. (2004) 1 1 1 1 1 0 1 1 1 8
Laaksonen et al. (2002) 1 1 1 1 1 1 1 1 1 9
a Representativeness of the exposed cohort
b Selection of the non-exposed cohort
c Ascertainment of exposure
d Demonstration that outcome of interest was not present at start of study
e Comparability of cohorts on the basis of the design or analysis (adjusted for age)
f Comparability of cohorts on the basis of the design or analysis (adjusted for any other factor)
g Assessment of outcome
h Was follow-up long enough for outcomes to occur
i Adequacy of follow-up of cohorts
Figure S1. Leisure-time physical activity (LTPA) and risk of metabolic syndrome
(MetS) (high/low)
Figure S2. Association of LTPA and MetS risk, dose-response analyses (A, LTPA
and MetS risk with BMI adjustment, per 10 MET h/week; B, LTPA and MetS risk
without BMI adjustment, per 10 MET h/week; C, LTPA and MetS risk with BMI
adjustment, dose–response analysis; D, LTPA and MetS risk without BMI
adjustment, dose–response analysis)
Figure S3. Funnel plot of LTPA and MetS risk (Begg’s test for publication bias: P =
0.025)
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