Heading Football and Head Impacts 'Change Blood Patterns in Brain'

Repeated heading and accidental head impacts in football cause changes to blood patterns in the brain, potentially interfering with signalling pathways, according to a study of players in Norway. From a report: The peer-reviewed research, published in the Brain Injury journal, is the latest item in a growing body of evidence pointing to the dangers of heading. It discovered "specific alterations" in levels of microRNAs in the brain upon analysing blood samples from 89 professional players in the country's top flight. MicroRNAs are molecules that help to regulate gene expression, through which DNA instructions are converted into products such as proteins, in bodily fluids. The findings suggest that, given the change in levels, they may be able to be used as biomarkers to detect brain injury. Blood samples were taken from players after accidental head impacts in matches and after specifically designed training sessions. Forty-eight of the players, drawn from three teams, took part in a session that included repetitive heading drills from set pieces and similar scenarios; they also undertook one that involved other high-intensity exercise, with no head contact allowed. The results found specific changes in certain microRNA levels whose numbers were unaffected by the other high-intensity exercise.

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