I was going to post this in Technical but decided on this forum instead. I'm not giving this away for free, you're going to have to wade through the research paper.
The Effects of Concurrent Activation Potentiation on Bat Swing Velocity of Division II College Softball Athletes
As an ethical and practical ergogenic strategy, concurrent activation potentiation (CAP), achieved by remote voluntary contractions (RVC) such as jaw clenching, has been proposed to acutely enhance muscular and athletic performance characteristics. The ...
www.ncbi.nlm.nih.gov