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Muscle Contrxns
Types of Muscle Contractions
| Question | Answer |
|---|---|
| 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
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