Biomechanical stretch and strain can be mimicked in this device by rhythmic contractions of the flexible membrane. (mdibl.org)
Diarrhea upsets the normal rhythmic contractions and sensations of the GI tract, causing your dog or kitty to feel the constant need to eliminate. (healthypets.mercola.com)
The uterus will make rhythmic contractions and she will feel them. (kidsinthehouse.com)