Table 2. Characteristics of the included studies.

Author, year	Population	Interventions	Intervention contents	Main outcome
Font-Lladó et al. (2020)	n = 190 boys: 90; girls:100 age: 7.43 ± 0.32yr CG: n = 93, EG: n = 97	12 weeks, 2 times/week EG: 20 min INT warm-up + PE CG: 20 min warm-up + PE	Strength: squat, shoulder bridge, lunge, death lift, pull press Plyometrics: vertical jump, hop, lateral jump Speed and Agility: skip, Zig-zig run, ladder drills Stability: Plank, kneeling balance, bilateral or unilateral balance	motor competence: INT ↑>CG ↑ FMS: INT ↑>CG ↑
Sindic et al. (2021)	n = 72, girls:72 EG: n = 37 age: 8.17 ± 0.31yr CG: n = 35 age: 8.11 ± 0.31 yr	8 weeks, 2 times/week EG: 15 min INT + 30 min PE CG: 3–5 min warm-up + (10 min) stretching and strength exercises + 30 min PE	Strength: squat, lunge Plyometric: squat jump, 90° jump, hop Object control: catch Stability: plank, single leg balance, twist	push-ups: INT ↑>CG ↑ modified pull-ups: only INT ↑ flexed arm hang: only INT ↑ flexibility: both groups ↔ endurance: both groups ↔
Faigenbaum et al. (2011)	n = 40 boys: 16; girls: 24 EG: n = 21 boys:10; girls:11 age: 7.5 ± 0.3 yr CG: n = 19 boys:6 girls:13 age: 7.6 ± 0.3yr	8 weeks, 2 times / week EG: 15 min INT +28 min PE CG: 43 min PE	Strength: squat, chest press Plyometric: squat jump, 90° jump Stability: single leg balance, twist Object control skills: catch	push-ups: only INT ↑ curl-ups: only INT ↑ long-jump: INT ↑>CG ↑ single leg hop: INT ↑>CG ↑ 0.5-mile run: INT ↑>CG ↑ shuttle run: INT ↑ = CG ↑ stork standing: INT ↑ = CG ↑ sit and reach: INT ↑ = CG ↑
Duncan, Eyre & Oxford (2018)	n = 94 boys: 49, girls: 45 EG: n = 53 age: 6.43 ± 0.5 yr CG: n = 41 age: 6.23 ± 0.7 yr	10 weeks, 1 time/week EG: 30–40 min INT class CG: 30–40 min PE class	Strength squat, bear crawl, squat, throw Plyometric: hop, skip, jump Speed and Agility: Zig-zig run, ladder drills Object control skills: catch	FMS: INT ↑>CG ↑ 10 m sprint: only INT ↑ medicine ball throw: INT ↑>CG ↑ countermovement jump: only INT ↑ standing long jump: INT ↑>CG ↑
Duncan, Hames & Eyre (2019)	n = 140 boys: 77; girls: 63 EG 1: n = 50 age: 6.4 ± 0.5 yr EG 2: n = 48 age: 6.0 ± 0.7 yr CG: n = 42 age: 6.2 ± 0.5 yr	10 weeks, 1time/ week EG1 and EG 2: 30–40 min INT class CG: 30–40 min PE class	Strength: squat, bear crawl, squat throw, toss Plyometric: hop, skip, jump Speed and Agility: Zig-zig run, ladder drills Object control skills: catch	total motor competence: INT 2 ↑>INT 1 ↑>CG ↑ locomotor motor competence: both INT s ↑>CG ↑ object control motor competence: INT 2 ↑>INT 1 ↑>CG ↑ 10 m sprint: INT 2 ↑>INT 1 ↑= CG ↑ standing long jump: INT 2 ↑ >INT 1 ↑= CG ↑ seated medicine ball throw: both INTs ↑>CG ↑
Silva-Moya et al. (2022)	n = 45 age: 8–10 yr EG: n = 22 boys: 10 girls:11 CG: n = 23 boys: 10; girls: 13	6 weeks, 2 times/ week EG: 20 min INT + 70 min PE CG: 90 min PE	Plyometric: jump Stability: single leg standing on stable and unstable surface Joint movement: handheld medicine ball performing a figure Object control: throw ball	Balance: only INT ↑
Guzmán-Muñoz et al. (2020)	n = 32 EG: n = 16 boys:7 girls:9 age: 8.40 ± 0.72 yr CG: n = 16, boys:8; girls:9 age: 8.14 ± 0.77 yr	4 weeks, 2 times/ week EG: 5 min warm-up + 15 min INT + 70 min PE CG: 90 min PE	Strength: squat, chest press Plyometric: squat jump, 90° jump Stability: single leg balance, twist Object control skills: catch	Double-leg stance: only INT ↑ mSEBT: only INT ↑

Notes.

↑, significant within-group improvement from pretest to pos t-test; ↔, non-significant within-group change from pretest to pos t-test; >, significant and greater improvement in the former group than the latter group; =, non-significant between-group change after interventions; +, combine with; yr, year; n, number; min, minute; INT, Integrated Neuromuscular Training; EG, experimental group; CG, control group; FMS, Fundamental Movement Skills; PE, Physical Education; EG 1, Locomotor first experimental group; EG 2, Object first experimental group; mSEBT, modified Star Excursion Balance Test.