To the Editor: The article by Dr Matser and
colleagues1 is the latest in an increasingly
worrisome series of studies documenting subtle brain injury among longtime
soccer players. Brain atrophy,2 electroencephalographic
changes,3 and deficits in memory, concentration,
and alertness4 have been documented in veteran
professional soccer players. Matser et al found that amateur soccer players
performed significantly worse in tests of memory and planning than did control
runners and swimmers, and that the degree of cognitive impairment correlated
with the number of concussions previously incurred, leading to chronic traumatic
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