Not that I know of. But the positive effect of sparring is well known, and you can even find scientific papers https://www.ncbi.nlm.nih.gov/pubmed/21088118. But repeatedly heavy punches to the head has been linked to Parkinsons, so the role of boxing and PD is Janus-faced:)
interesting do you know if any aspect of grappling training was researched ?
Not that I know of. But the positive effect of sparring is well known, and you can even find scientific papers https://www.ncbi.nlm.nih.gov/pubmed/21088118. But repeatedly heavy punches to the head has been linked to Parkinsons, so the role of boxing and PD is Janus-faced:)
I wonder if it might benefit to limit sparring to body blows
for Parkinsons I mean