When a hockey player suffers a concussion, he becomes more sensitive to injuries from damage from subsequent blows to the head. And the effect is cumulative: the more hits, the greater the risk of permanent injuries.
It is a long-standing tradition in the United States (though not universally observed) that high school football games are played on Friday, college games on Saturday, and professional games on Sunday. In recent years, weekday-night games have become more common, however.
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