Table 3

Study characteristics.

Study	Population			Training programme
	Country	Age (years)	Sample analysed	Frequency_^a	Duration (min)	No. of exercises	Components
	Country	Age (years)	Sample analysed	Frequency_^a	Duration (min)	No. of exercises	R	B	S	A	P
Achenbach et al. (2018)	Germany	IG: 14,9 ± 0,9^b CG: 15,1 ± 1,0^b	N = 174 GI: n = 98 GC: n = 76	PRE: 2/3 SEAS: 1	15	5	✘	✔︎	✔︎	✘	✔︎
Myklebust et al. (2003)	Norway	21 – 22	Season 1: n = 855 (58 teams) Season 2: n = 850 (52 teams)	PRE: 3 SEAS: 1	15	3	✘	✔︎	✘	✔︎	✔︎
Olsen et al. (2005)	Norway	IG: 16,3 ± 0,6^b CG: 16,2 ± 0,6^b	N = 1586 IG: n = 808 CG: n = 778	PRE: 3 SEAS: 1	15 – 20	4	✔︎	✔︎	✔︎	✔︎	✔︎
Petersen et al. (2005)	Germany	IG: 19,8 CG: 19,4	N = 276 IG: n = 134 (10 teams) CG: n = 142 (10 teams)	PRE: 3 SEAS: 1	10	4	✘	✔︎	✘	✘	✔︎
Wedderkopp et al. (1999)	Denmark	16 – 18	N = 237 IG: n = 111 CG: n = 126	SEAS: all	10 – 15	3	✘	✔︎	✘	✘	✘
Zebis et al. (2016)	Denmark	IG: 15,9 ± 0,4^c CG: 15,6 ± 0,5c	N = 40 IG: n = 20 CG: n = 20	PRE: 3 (12 weeks)	15	3	✔︎	✔︎	✔︎	✔︎	✔︎
Note. R: running; B: balance; S: strength; A: agility; P: plyometric; IG: intervention group; CG: control group; PRE: preseason; SEAS: season. ^aIn sessions per week. ^bThe study included men and women. ^cThe study included football and handball.