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Muscle Contractions

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by

Bemnet Ghebreselassie

on 8 November 2012

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Transcript of Muscle Contractions

Static Contractions A static contraction is when the muscle tension or internal force is exerted against an external load. The internal force is equal to or weaker than the external load. No visible movement occurs. Static: Isometric Contractions Isometric contractions happen when a muscle contracts against an external force. The external force is greater than the force generated by internal force. Isometric Contractions Concentric - Muscles shorten during movement Dynamic Contractions Muscle tension is exerted against an external load
Internal force exerted is greater than the external load Visible movement of the external load occurs Muscle Contractions Examples of sports the require this contraction are sail-boarding, alpine skiing, and shooting events. Other examples of static contractions include the bench press and leg press. Static contractions branch off into Isometric contractions which can be classified as concentric or eccentric Examples of Isometric contractions include pushing against a wall and an arm wrestling match where both opponents are equal strength. It's commonly used in strength training, yoga, and martial arts. Eccentric - Muscles lengthen during movement (Same length) Resistance and strength training; squats Dynamic splits into four different categories Isotonic Change in muscle length occurs Constant tension is achieved Lowering a weight at a slow and constant speed Auxotonic Varied tension within the muscle to manipulate the joint movement speed Tension that is required to move an external load varies Ex: Barbell Curls
(Same Speed) Involves a constant speed contraction against a high resistance High level of tension with all joint angles Plyocentric Hybrid contraction: Muscle Manipulation The muscle performs an isotonic, concentric contraction from a stretched position Pre-stretching initiates the Golgi tendon organ reflex which causes the muscle to contract Ex: Jump Squat Varied Tension Same Tension Isokinetic
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