Nerve activity linked to jaw muscle stiffness in bruxism study

This study looked at 89 people — some with bruxism (teeth grinding) and some healthy — to see if there is a connection between the body's 'automatic' nervous system and the tightness, stiffness, and elasticity of the chewing muscles. Participants wore a chest strap to measure heart activity and had their jaw muscles tested with a device. The goal was simply to understand these relationships better, not to test a treatment.