Share this. Generally, pins and needles is not a big deal. That prickling, numbing, burning feeling â which is known as paraesthesia in medical circles â is often nothing to be concerned about. In the majority of cases, a pins and needles sensation is just your nerves telling you that you need to get more blood to that part of your body. [Read more: More than half of Brits suffer from this condition]
Static contractions with no change in the length of the muscle partial or complete contraction, isometric contraction occurs when tension is developed within the muscle but the joint angle remains constant, resulting in no appreciable change in length.
shortening contraction a muscle contraction in which the ends of the muscle move closer together, as when a flexed limb is extended. tetanic contraction sustained muscular contraction without intervals of relaxation.tonic contraction tetanic c. twitch contraction twitch.ourglass contraction contraction of an organ, as the stomach or uterus, at or near the middle. isometric contraction muscle contraction without appreciable shortening or change in distance between its origin and insertion. Isotonic (A) and isometric (B) contraction.