Soccer Study Found No Knee Strength Correlation
New research revealed no robust link between knee strength and postural control in young soccer players.
Updated on Sept. 19, 2026 in Soccer
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A study of 70 youth soccer players found no robust association between knee strength and postural control. Published on September 19, 2026, the research utilized dynamometers to assess athletes aged 9 to 12.
Why it matters
Understanding physical development in young athletes helps in refining injury prevention protocols and training programs. Determining whether specific strength markers correlate with balance is essential for evidence-based coaching.
Researchers tested 70 players aged 9 to 12 years using ForceFrame dynamometers and ForceDecks platforms. While baseline links were not robust, knee-extension force increased by 28.86 N during a second assessment, reflecting a Cohen's d z-value of 0.60.
The players
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The details
The study utilized partial Spearman correlations adjusted for sex, age, and body mass to analyze the relationship between isometric knee-flexion force and postural stability. Findings showed that while extension forces improved during the 5-day camp, these strength gains did not statistically correlate with improved balance outcomes.
Timeline
November 30, 2024: The study was registered on ClinicalTrials.gov.
September 19, 2026: The research article was officially published.
Season Trajectory
This study aligns with broader efforts to standardize youth athletic development research via the clinical trials registration protocol at ClinicalTrials.gov. By clarifying the lack of a direct link between simple strength metrics and balance, it shifts the focus toward more complex neuromuscular training methods.
Coaches and trainers should note that increasing isometric knee-extension force alone does not guarantee improved postural control in players aged 9 to 12. This suggests that balance-specific drills remain a distinct and necessary component of soccer training regimens.
The takeaway
Youth soccer programs should continue to prioritize comprehensive training that addresses both strength and balance independently. The lack of a simple correlation suggests that athletic performance is driven by a more nuanced interplay of physical factors.
Further reading
Explore more training developments in Soccer.
More information
Review the full ClinicalTrials.gov study registration for technical methodology.
Source note: This article includes information reported by Nature.
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Should youth sports programs focus on standardized strength metrics to improve athlete development?
