If your surgical wound becomes infected, the area is more likely to become weak. You may also get a hernia next to a stoma. A stoma is an opening in your abdomen that drains stool from your bowels. Muscle strain: Heavy lifting and pregnancy can strain the muscles in your abdomen.
WHAT THEY DO... Active trigger points cause muscle pain. Latent trigger point can cause stiffness in a muscle. Triggers are created by a protective mechanism in your body - a message that tells a muscle to tighten up to prevent further damage.
TTL triggers are triggers that are capable of communicating the hotshoe protocol so that features aside from syncing can be sent from the camera's hotshoe to the remote flash foot. If you look at the flash foot or the camera hotshoe, the pin/contact that's in the center of the square is the sync signal. That's the signal that tells the flash when to fire so that it's in sync with the camera shutters and that the light from the flash will be used for the exposure.