What has science discovered about sub-concussive (below full concussions) blows to the head?

Science has discovered that sub-concussive blows to the head are causing as much neurological damage as a full on concussion. ... The discovery of this knowledge brought a new light to how even though athletes are not showing signs of full blown concussions, the average hits they take on are causing repetitive damage.

Explanation:

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ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j