According to some recent research out of Toronto, to be published in the American Journal of Sports Medicine, led by Michael Hutchison this is the case.  Any athlete suffering an injury showed declines in neurocognitive testing, significantly compared to a control group.

In this study both concussed athletes and other injured athletes were compared to a control group of uninjured athletes;

For the current study, researchers at the University of Toronto gave the 20-minute computer test to 72 student-athletes, including football, hockey, and lacrosse players. Eighteen of those athletes had suffered a concussion in the past three days, and another 18 had been taken out recently by a muscle or tendon injury.

The other 36, used for comparison, were uninjured.

We would all suspect that the concussion group would decline Continue reading →