Time to skip P.E.? A FIFTH of teenagers have suffered a brain injury while playing sport at school

First large-scale study to measure the number of students' self-reported concussions at school, rather than just hospital-reported cases High figure has shocked researchers because multiple brain injuries can lead to lasting cognitive impairment In Canada, where study was carried out, 50% of injuries that kill and disable young people are caused by brain trauma

By Helen Collis

PUBLISHED: 04:41 EST, 26 June 2013 | UPDATED: 08:19 EST, 26 June 2013

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One in five adolescents has been knocked unconscious while playing sport at school - a figure that has shocked researchers.

Brain injuries measured in the research included cases where children had been unconscious for at least five minutes and those who had needed to be hospitalised over night.

Most previous studies have only recorded hospital cases of children's brain injuries; the addition of self-reported concussion which did not result in hospital treatment has now raised serious concerns in Canada, where the study was carried out.

Risk?: Large-scale Canadian study find s that one in five teenagers has been knocked unconscious during sport at school

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Time to skip P.E.? A FIFTH of teenagers have suffered a brain injury while playing sport at school