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According to the study, published in the journal Neurology, in the current fighters, the volume loss was in areas of the brain that suggest it is a result of the injury, when nerve fibers are torn as the brain shifts inside the skull.Among the retired fighters, the volume loss was in areas of the brain that suggest it is due to the progressive disease process seen in neurodegenerative diseases such as chronic traumatic encephalopathy (CTE) or Alzheimer's disease, the research added.CTE is a rare brain disease found in athletes and others with a history of repeated head traumas. Symptoms include memory loss and thinking problems as well as emotional and behavioural changes such as aggression."More research is needed to confirm these findings and to see if this pattern of loss of brain volume continues over a longer time period, but the results suggest that people with repeated head impacts may experience different processes in the brain at different times," said study author Charles Bernick, member of the American Academy of Neurology in the US.The study involved 50 current boxers with an average age of 29 and an average of five fights; 23 retired boxers with an average age of 45 and an average of 38 fights; and 100 mixed martial arts fighters with an average age of 29 and an average of eight fights.They were compared to 31 non-fighters with an average age of 31 who had no history of head trauma, military service or participation at the high school level or higher in a sport in which head trauma can often occur, such as football or soccer.The participants had brain scans and took tests of memory and thinking skills at the beginning of the study and again each year for at least two years.Compared to the non-fighters, the current boxers had a greater average yearly rate of loss of brain volume in the areas of the left thalamus, the mid-anterior corpus callosum and the central corpus callosum.In the MMA fighters, a similar pattern was seen, but to a slightly lesser extent, in the left thalamus and the central corpus callosum, the study said.For the left thalamus area of the brain, the average volume at the beginning of the study was 3,773 cubic millimetres.The current boxers lost an average of 145 cubic millimetres (mm3) in volume per year, compared to a loss of 100 mm3 for the MMA fighters and a gain of 43 mm3 for the non-fighters, the study said.The retired boxers did not show changes in those areas of the brain. Instead, they showed brain volume loss in the areas of the left and right amygdala and the right hippocampus.These are areas of the brain that are affected in diseases such as Alzheimer's and CTE.Overall, the researchers found no significant differences in the scores on the thinking and memory tests among the groups of current and retired fighters and non-fighters.However, when they divided the current fighters into those who had brain volume loss and those without, they found that those with brain volume loss had worse scores on two of the thinking tests for processing speed.( With inputs from IANS )

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Health :Boxers, MMA fighters show distinct brain injury patterns

Active professional fighters showed different patterns of brain volume loss than retired fighters, a new research has found. ...