Influence of Strength Training Variables on Neuromuscular and Morphological Adaptations in Prepubertal Children: A Systematic Review.

Researchers pulled together 22 studies involving around 600 prepubertal children (averaging 10 years old) to see what actually happens when kids do strength training. The children had no prior experience with this type of training, which made them a good group to watch for genuine adaptations. The results were pretty consistent across the board: every single study that measured muscle strength found increases, kids got better at jumping and sprinting, and their body composition shifted toward less fat and more lean muscle.

The gender breakdown revealed something worth noting though—boys showed clearer improvements in overall sport skills and physical abilities compared to girls, though the researchers were cautious about this finding since far fewer studies included girls. This systematic review essentially confirms that strength training does produce real physical changes in prepubertal children, though the exact recipe of how to structure these programs still has some loose ends.

If you're a parent wondering whether strength training is safe or useful for your child before puberty, here's what the research currently shows. When kids engaged in strength training programs, they reliably got stronger, jumped higher, ran faster, and their muscles grew while fat decreased.

These changes happened across the board in the studies reviewed, so the effects appear consistent rather than being a fluke. However, the research has some important gaps.

The studies included far fewer girls than boys, so it's harder to say whether girls respond differently to this type of training or whether the programs just weren't tailored for them. The takeaway is that strength training does produce measurable physical changes in kids, but parents and coaches should think carefully about how these programs are designed and delivered.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This systematic review synthesises evidence on an increasingly common clinical question: what training variables trigger adaptations in prepubertal children without prior strength training experience. Across 22 studies (PEDro-assessed, so reasonably rigorous), the neuromuscular findings were uniform—every included study showed strength gains, and jumping and sprint performance improved in most cases (29 and 13 studies respectively).

Morphological adaptations were also consistent, with reductions in body fat percentage and increases in lean mass appearing across multiple studies. The gender signal deserves caution though.

Although boys showed clearer gains in general sport skills, the evidence base for girls was sparse, making it hard to determine whether this reflects genuine sex-related differences in adaptation or simply reflects sampling and program design bias in the existing literature. From a practice perspective, this confirms that prepubertal strength training does produce real adaptations, but clinicians would benefit from more granular data on dose-response relationships and whether current program structures actually suit girls as well as boys.