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Table 2 Description of included studies/data sets

From: The effect of resistance training interventions on weight status in youth: a meta-analysis

Study

Country

Participant details

Intervention details

Outcome measures

Quality score

N

Age (years ± SD) or range

Pubertal stage (Tanner)

Weight status

% males

Sex of training group

Location

Weeks/× per week (min per session)

Sets/reps /intensity

Exercises

Benson et al. 2008 [33]

New Zealand

EG 37

EG 12.3 ± 1.3

1–5

Mixed

59%

Mixed

Community

8 weeks/× 2

2 sets,8 reps, 80%1RM

Bicep screw curl, tricep extension, one arm dumbbell row, one dumbbell front raise, bench press, standing leg abduction, standing leg curl, calf raise, squat, abdominal crunch, abdominal reverse crunch.

Body mass (kg), body mass index (BMI), body fat (%), fat free mass (kg), fat mass (kg), waist circumference (cm)

2

CG 41

CG 12.2 ± 1.3

Chaouachi 2014 (a) [34]

Tunisia

EG 17

EG 11 ± 1

1–2

Healthy

100%

Males

Community

12 weeks/× 2

1–3 sets, 8–12 reps, /

Squats, lunges, alternate flat and incline chest press, unilateral shoulder flies or presses

Body mass (kg), body fat (%)

2

CG 13

CG 11 ± 1

Chaouachi et al. 2014 (b) [34]

Tunisia

EG 17

EG 11 ± 1

1–2

Healthy

100%

Males

Community

12 weeks/× 2

1–3 sets, 8–12 reps, Max weight, good form

Cleans, snatches, shoulder push press, kettlebell/dumbbell cross body pull.

Body mass (kg), body fat (%)

2

CG 11

CG 11 ± 1

Dos Santos Cunha et al. 2015 [35]

Brazil

EG 9

EG 10.4 ± 0.5

1

Healthy

100%

Males

School

12 weeks/× 3 (60 m)

3 sets, 6–15 reps, 60–80%1RM

Knee extension, elbow flexion, leg curl, bench press, hip adduction, inverse fly, and hip abduction

Body mass (kg), body fat (%), fat free mass (g), fat mass (g)

1

CG 9

CG 10.9 ± 0.7

Davis et al. 2009 [36]

USA

EG 17

EG 15.5 ± 1

4–5

O/W

/

/

Community

16 weeks/× 2 (60 m)

1–3 sets, 3–15 reps, 62–97% 1RM

Session 1 = leg press, deadlift, biceps curl, triceps extension, shoulder press. Session 2 = bench press, lat pull down, leg extension, leg curl, calf raises

Body mass (kg), body mass index (BMI), BMI percentile, BMI z score, fat mass (kg), lean mass (kg)

2

CG 21

CG 15.5 ± 1

Dorgo et al. 2009 [37]

USA

EG 63

EG 16 ± 1.2

/

Healthy

/

/

School

18 weeks/× 3 (80 m)

2–4 sets, 8–14 reps, partner resistance

Squat, seated chest press, bent-over row, seated row, lat pulldown, leg extension, overhead triceps extension, step lunge, shoulder press, seated fly, Romanian deadlift, good-morning, shoulder press, upright row, lying triceps extension, seated back extension, extended arm pressdown, standing biceps curl

Body mass index (BMI), skinfolds (mm)

2

CG 129

CG 15.8 ± 1.1

Faigenbaum et al. 1993 [38]

USA

EG 14

EG 10.8

1–2

Healthy

68%

Mixed

/

8 weeks/× 2 (35 m)

3 sets, 10–15 reps, 50–100%1RM

Leg extension, leg curl, overhead press, bicep curl, chest press

Body mass (kg), skinfolds (mm), waist circumference (cm)

2

CG 10

CG 9.9

Lau et al. 2004 [30]

Hong Kong

EG 21

10–17

/

Obese

68%

Mixed

Community

6 weeks/× 3(60 m)

3 sets > 5reps, 70–75%1RM

Chest press, lat pull down, shoulder press, leg press, leg extension, leg curl, heel raise, bicep curl, tricep extension, adjusted push-up

Body mass (kg), Body mass index (BMI), waist circumference (cm), hip circumference (cm), waist to hip ratio, lean mass (kg), fat mass (kg), body fat (%)

2

CG 17

Lillegaard et al. 1997 (a) [39]

USA

EG 20

EG 11.2

1–2

Healthy

100%

Mixed

/

12 weeks/× 3(60 m)

3 sets, 10 reps, 10RM

Barbell curl, tricep extension, leg press, leg curl, lat pulldown, bench press

Skinfolds (mm)

3

CG 18

CG 10.1

Lillegaard et al. 1997 (b) [39]

USA

EG 16

EG 14

3–5

Healthy

100%

Mixed

/

12 weeks/× 3(60 m)

3 sets, 10 reps, 10RM

Barbell curl, tricep extension, leg press, leg curl, lat pulldown, bench press

Skinfolds (mm)

3

CG 10

CG 13.1

Lillegaard et al., 1997 (c) [39]

USA

EG 8

EG 9.5

1–2

Healthy

0%

Mixed

/

12 weeks/× 3 (60 m)

3 sets, 10 reps, 10RM

Barbell curl, tricep extension, leg press, leg curl, lat pulldown, bench press

Skinfolds (mm)

3

CG 6

CG 9.6

Lillegaard et al. 1997 (d) [39]

USA

EG 8

EG 12.6

3–5

Healthy

0%

Mixed

/

12 weeks/× 3 (60 m)

3 sets, 10 reps, 10RM

Barbell curl, tricep extension, leg press, leg curl, lat pulldown, bench press

Skinfolds (mm)

3

CG 5

CG 12.6

Lubans et al. 2010 (a) [40]

Australia

EG 15

EG 14.9 ± 0.6

/

Mixed

0%

Mixed

School—free time

8 weeks/× 2 (50 m)

2 sets, 8–12 reps, max reps

Squat, lunge, calf raise, bent over row, bench press, front raise, biceps curl, triceps extension, crunch and Russian twist

Body mass (kg), waist circumference (cm), body mass index (BMI), fat mass (kg), fat free mass (kg), body fat (%)

2

CG 16

CG 14.5 ± 0.6

Lubans et al. 2010 (b) [40]

Australia

EG 22

EG 15.3 ± 0.8

/

Mixed

100%

Mixed

School—free time

8 weeks/× 2 (50 m)

2 sets, 8–12 reps, max reps

Squat, lunge, calf raise, bent over row, bench press, front raise, biceps curl, triceps extension, crunch and Russian twist

Body mass (kg), waist circumference (cm), body mass index (BMI), fat mass (kg), fat free mass (kg), body fat (%)

2

CG 14

CG 14.8 ± 0.4

Schranz et al. 2014 [41]

Australia

EG 30

EG 14.9 ± 1.4

2+

O/W/ obese

100%

Males

Community

24 weeks/× 3

1–3 sets, 8–12 reps, progress with good form

Bench press, leg press, lat pulldown, leg curl (lying or seated), shoulder press (seated), seated row, biceps curl, triceps pressdown, calf raise (seated) and abdominal crunch.

Body mass (kg), body mass index (BMI), skinfolds (mm), body fat (%), lean mass (kg)

1

CG 26

CG 15.1 ± 1.6

Schwingshandl et al. 1999 [42]

Austria

EG 14

EG 11 ± 2.5

/

Obese

43%

Mixed

Community

12 weeks/× 2 (60 m)

2 sets, 10 reps, 50–100%1RM

Lying leg press; seated leg extensions and leg curls; seated bench press; lat pulldown to the front and long pulley row; seated shoulder press; triceps pushdowns and triceps extension at the dips machine; dumbbell biceps curls; calf raises seated and crunches

Body mass (kg), body mass index (BMI) SDS, fat free mass (kg)

2

CG 16

CG 12.2 ± 2.7

Shaibi et al. 2006 [43]

USA

EG 11

EG 15.1 ± 0.5

3+

O/W

100%

Males

Community

16 weeks/× 2

1–3 sets, 3–15 reps, 52–97%1RM

session 1 = Leg press, dead lift biceps curl, triceps extension, shoulder press, session 2 = bench press, lat pull down, leg extension, leg curl calf raises

Body mass (kg), body mass index (BMI) percentile, fat mass (kg), lean mass (kg), body fat %

1

CG 11

CG 15.6 ± 0.5

Siegel et al. 1989 (a) [44]

USA

EG 26

EG 8.4

/

Healthy

100%

Mixed

School—free time

12 weeks/× 3 (30)

30 s work, 15 s rest, progress to 45 s work circuit training, body weights and weights up to 4.5lbs

Upper body self-supported locomotor movements (i.e., wheelbarrow, seal walk, crabwalk, etc.). A choreographed weight routine used tennis ball cans or detergent bottles filled with sand. Weights of 2.5, 3.0, 3.5, 4.0, and 4.5 lb. were offered. The third format was circuit training using various types of accessories as resistance, tennis balls for squeezing, and strips of rubber tire to pull

Body mass (kg), skinfolds (mm), body fat (%)

1

CG 30

CG 8.6

Siegel et al. 1989 (b) [44]

USA

EG 24

EG 8.7

/

Healthy

0%

Mixed

School—free time

12 weeks/× 3(30)

30 s work, 15 s rest, progress to 45 s work, circuit training, body weights and weights up to 4.5lbs

Upper body self-supported locomotor movements (i.e., wheelbarrow, seal walk, crabwalk, etc.). A choreographed weight routine used tennis ball cans or detergent bottles filled with sand. Weights of 2.5, 3.0, 3.5, 4.0, and 4.5 lb. were offered. The third format was circuit training using various types of accessories as resistance, tennis balls for squeezing, and strips of rubber tire to pull

Body mass (kg), skinfolds (mm), body fat (%)

1

CG 16

CG 8.4

Sigal et al. 2014 [29]

Canada

EG 78

EG 15.9 ± 1.5

4–5

Obese

31%

Mixed

Community

24 weeks/× 4

2–3 sets, 6–15 reps, moderate for 15 reps then 8RM

1: Bench press, chest fly lateral raise, shoulder, shrugs, bicep curl, tricep press, abdominal crunches. 2: Incline bench press, incline chest fly, shoulder press, front raise, preacher curl, assisted tricep dips, sit-ups. 3: Squat, leg curl, front lat pull down, seated row, lunge straight leg raise, abdominal crunches. 4: Leg press, leg extension, dumbbell pullover, seated row, lying knee extensions

Body mass (kg), body mass index (BMI), waist circumference (cm), body fat (%), fat mass (kg), lean mass (kg)

1

CG 76

CG 15.6 ± 1.3

Takai et al. 2013 [45]

Japan

EG 36

EG 13.6 ± 0.6

/

Healthy

100%

males

School—free time

8 weeks/× 4–6 (> 10 m)

100 reps, body weight

Squats

Body mass (kg), body mass index (BMI), body fat %, lean mass (kg)

1

CG 58

CG 13.8 ± 0.5

Treuth et al. 1998 [27]

USA

EG 11

EG 8.7 ± 0.7

1–2

Obese

0%

Females

School—free time

20 weeks/× 3 (20 m)

2 sets, 12–15 reps, 50%1RM

Bench press, military press, lat pull down, bicep curl, tricep extension, ab curls, leg press

Body mass (kg), body fat (%), fat mass (kg), lean mass (kg), fat free mass (kg)

1

CG 11

CG 8.4 ± 0.9

Velez et al. 2010 [46]

USA

EG 13

EG 16.1 ± 0.2

/

Mixed

57%

Mixed

School

12 weeks/× 3 (90 m)

2–3 sets, 10–15 reps, 80% 10RM

Bench press, seated row, shoulder press, lat pulldowns, flies, bicep curls, and tricep pushdowns or lower body exercises including squats, Romanian dead lift, leg extensions, leg curls, lunges, and calf raises.

Body fat (%), lean mass (kg), fat mass (kg), body mass index (BMI)

2

CG 15

Yoshimoto et al. 2016 [47]

Japan

EG 27

EG 13.8 ± 0.6

1–5

Healthy

0%

Females

School—free time

8 weeks/× 4–6 (> 10 m)

100 reps, body weight

Squats

Body mass (kg), Body mass index (BMI), body fat %, lean mass (kg)

1

CG 20

CG 13.8 ± 0.5