Sport Specialization, Physical Performance and Injury History in Canadian Junior High School Students.
Chris Whatman, Carla van den Berg, Luz Palacios-Derflingher and 1 others
PMID 34909261WHAT IT FOUND
Sport specialization was not linked to higher injury odds or worse physical performance in Canadian junior high students.
However, girls and students with more total sports hours had higher odds of reporting a previous injury, regardless of specialization level.
Key findings
01Being highly or moderately specialized did not increase the odds of reporting a history of injury compared to low specialization.
02There were no significant differences in vertical jump height, aerobic capacity, or balance performance between high or moderate specialization groups and the low specialization group.
03Girls and students with higher total yearly sports hours had significantly higher odds of reporting a previous injury.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample size is relatively small (238 students), and the proportion of highly specialized students (18%) may not be generalizable to all junior high populations. Injury data was retrospective, relying on student/parent recall from the previous 12 months, which introduces potential bias. The study pooled many different sports, so it cannot determine if specialization is risky in specific sports (e.g., volleyball vs. soccer). The specialization rating relied on self-report questions, which may have underestimated specialization for students who had only ever played one sport (and thus could not have 'quit' others). The cross-sectional design means causality cannot be established; we do not know if specialization preceded the injuries or if performance levels influenced specialization choices.
Declared interests
The authors declare no conflict of interest. The study was funded by Alberta Innovates, with support from the International Olympic Committee Research Centre Award and the Alberta Children’s Hospital Foundation.
The easy way to misread this
Do not conclude that sport specialization is safe for all youth. This study found no link between specialization and injury in a specific junior high age group (11-16), but it does not rule out risks in older adolescents or in specific sports with high repetitive loads. The finding that total sports hours increased injury odds suggests that volume, not just specialization, is a critical risk factor.