What are isometric muscle contractions?

Answer

The University of California San Diego defines an isometric muscle contraction as a contraction in which the muscle is activated and held at a constant length instead of being allowed to lengthen or shorten. An example of an isometric muscle contraction is carrying a heavy object in front of the body, while the object pulls down, the hands and arms oppose the force but do not move up or down.

According to Healthline, isometric exercises can be used as strength training. Because isometric exercises are done in a static position, which means they do not require dynamic movement, they can be performed anywhere without weights or other equipment. It only takes about 10 seconds to successfully complete one isometric exercise. These qualities make isometric muscle contraction an effective way to add strength training into a busy day.

Healthline suggests a series of effective isometric exercises that can be done throughout the day. The first is a palm press. In this exercise, the palms are pressed together as hard as possible for 10 seconds. A second exercise, the core engagement, is performed while sitting in a chair. The stomach muscles are deliberately tightened and feet are held a few inches above the floor. Isometrics are most effective when incorporated into a larger strength-training program.

Q&A Related to "What are isometric muscle contractions?"
Neural impulses and chemical reactions. If you really want to know the physilogical processes involved I suggest you pick yourself up a university grade medical/exercise science text
http://wiki.answers.com/Q/What_causes_isometric_co...
( ¦ī·sə′me·trik kən′trak·shən ) (physiology) A contraction in which muscle tension is increased, but the muscle is not
http://www.answers.com/topic/isometric-contraction
Isometric contraction is when the muscle is activated, but not allowed to lengthen or
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As during any exercise, the more tired you are the less you are focused on proper form. For example, when holding a squat, keep your core tight, butt low, knees at 90 degrees or more
http://www.ehow.com/list_6676298_dangers-isometric...
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During an isometric contraction, the muscle is contracted, but does not shorten, like during a isotonic contraction. In an isometric contraction, the muscles pull ...
Isometric contraction differs from isotonic in a way that the isometric contraction contracts to the length of a muscle fiber remaining in the same place and only ...
Boundless defines an isometric contraction as a contraction against a constant resistance. Basically, this means that the muscle is not changing in length or moving ...
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