Eight studies were included in the review (over 275 participants; sample size not reported for one study). There were two randomised studies (86 participants) and five quasi-experimental studies (189 participants); the design of one study was not reported. No studies that examined children with developmental coordination disorder, low motor competence, or low motor proficiency were identified.
All eight studies were judged as being of low quality (scored 3 to 6 out of 10 points).
Five of six studies that assessed the ability to jump found statistically significant improvements after plyometric training; three reported a large effect size.
Four studies that assessed running velocity found statistically significant improvements after plyometric training.
Two of three studies that assessed strength and power reported statistically significant improvements.
One study each assessed throwing ability, agility, kicking and balance; there was a statistically significant improvement after plyometric training for agility, kicking and balance.
Two studies reported that there were no injuries or complaints of muscle soreness.