This suggests that collisions-sport athletes are combating cellular dysfunction in the absence of observable external symptoms. Furthermore, this may mean the threshold for brain injury is lower than what was once thought.

Michigan State University

In collision-sport athletes, brain metabolism is negatively impacted throughout the course of a season due to mild head injuries even if a concussion is not known to have occurred. 

Neurometabolic Changes and Concussions

Bari, S., Svaldi, D.O., Jang, I. et al. Dependence on subconcussive impacts of brain metabolism in collision sport athletes: an MR spectroscopic study. Brain Imaging and Behavior 13, 735–749 (2019). https://doi.org/10.1007/s11682-018-9861-9

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