Types of Muscle Contractions A REALLY bad Cramp Pushing the Wall Bicep Curl Landing from a high place How Muscles Generate Force

Twitch Contractions A quick, jerky response to a stimulus –Play a minimal role in normal muscle activity

Tetanic Contraction Produced by a series of stimuli bombarding the muscle in rapid succession Contractions melt together and result in a sustained contraction or tetanus A BAD Cramp

Isometric The muscle if fired against a load, but DOES NOT Shorten or Lengthen Fires at a constant Length Carrying an object in front of you without dropping it

Concentric ShortensA muscle firing against a load Shortens causing movement at the joint Isotonic –R–R–R–Resistance through most of the ROM –R–R–R–Resistance decreases after a certain point –G–G–G–Gravity Assists Isokinetic –R–R–R–Resistance through the full ROM

Eccentric Muscle fibers are lengthening WHILE they are firingMuscle fibers are lengthening WHILE they are firing Controlling MovementControlling Movement Lowering a heavy weightLowering a heavy weight Landing from a jumpLanding from a jump DeceleratingDecelerating