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Muscle Contrxns

Types of Muscle Contractions

Contraction is when tension is developed in a muscle as result of a stim Used to: Cause Control Prevent Accelerate mvmnt Deccelerate mvmnt
Types of Muscle Contraction Isometric Isotonic
Isometric ContrXn Tension is developed, but angle doesn't change Static contraction significant amnt of T may be developed to maintain joint angle Prevents mvmnt by external F
Isotonic ContrXn Tension is developed, angle changes Dynamic contractions Varying degrees of T in muscles result in joint angles changing Cause or control joint mvmnt
Concentric type of isotonic contraction Muscle develops tension as it shortens Muscle developes enough F to overcome Resistance Against gravity Positive
Eccentric Muscle gradually lessens T to control descent of resistance Muscle lengthens under T Resistance overcome muscle contraction but muscle can still control Mvmnt with gravity F of muscle < R Negative Decelerates body mvmnt
Isokinetics Exercise using Concentric and/or Eccentric contractions V of mvmnt is constant Contraction occurs throughout the mvmnt NOT another type of contraction Ex- Biodex, Cybex, Lido
Agonist Muscles Primary moves Cause joint motion thru specified plane when contracting concentrically
Assistant movers or Assisters Agonist muscles that contribute sig. less to the joint motion
Antagonist located on opp side of joint from agonist Opposite concentric contraction "Contralateral muscles" Work in coop w/ agonist by relaxing and allowing mvmnt Concentric contraction performs opposite joint motion of agonist
Synergist Assist agonists "Guiding Muscles" Refine mvmnt & Rule out undesired motion
Neutralizers Prevent undesirable movements like inappropriate muscle substitutions Contract to resist specific actions of other muscles. Ex- when only sup. of biceps brachii is desired, triceps brachii contracts to neutralize flexion action of the biceps brachii
Stablizers Surround joint contract to fixate or stabilize area to enable another limb to move known as FIXATORS estab. firm base for more distal joints to work Ex: muscles of scap and gleno contract to stabilize shoulder and humerus in bicep curl
Force Couples Two or more F are pulling in diff. directions on an object causing the object to rotate about its axis. More efficient movement Steering wheel
Created by: jmgibson1