What is the difference between a "semi-contracted" muscle and a "contracted" muscle? I read on < > Muscle tension refers to the condition in which muscles of the body remain **semi-contracted** for an extended period. What is the difference between a "semi-contracted" muscle and a "contracted" muscle?

If you consider the length of a muscle can vary from resting length to shortest length, my guess is that semi-contracted is somewhere in between. I believe that spine-health.com isn't being entirely clear with their definitions.