Problem Areas Flashcards
Pronation
Ankle is turned inwards
Supination
Ankle is turned outwards
Dorsiflexion
Foot flexed (pointed toward ceiling)
Plantarflexion
Foot pointed (ex: calf raise)
Closed movement
Hands/feet are in a fixed position
Ex: Push-up
Open movement
Hands/feet are NOT in a fixed position and can move freely
Ex: Bicep curl
Isometric
Movement in which muscle length does not change
Ex: Iso-abs (Plank)
Isotonic
Movement consisting of concentric and eccentric muscle actions
Ex: Squat
Isokinetic
Movement at a constant speed
Note: typically can only be completed using expensive equipment typically found in rehab clinics
Length-tension Relationship
Optimal length = Optimal force
Too long or short = less force production capabilities
Sliding Filament Theory
Thick myosin heads slide along thin actin filaments
Shortening of filaments results in concentric muscle action
Reciprocal Inhibition
When an agonist contracts, the antagonists receives a signal to relax
Altered reciprocal inhibition
Increased neural drive to an overactive agonist results in excessive decreased neural drive to the antagonist
Ex: Droopy glute syndrome - tight psoas leads to underactive glutes
Synergistic Dominance
Synergist takes over a movement to compensate for a weak prime mover
Ex: Hamstrings take over for weakened glutes during a squat
Force-Velocity Curve
As velocity increases, concentric force decreases and eccentric force increases
Force-Couple Relationship
Muscles working together (moving in different directions) to produce a movement
Ex: Deltoid-Rotator Cuff Couple
Scapular Elevation
Upward motion towards sky
Prime mover: Levator Scapulae and Upper Traps
Scapular Depression
Downwards motion towards ground
Prime mover: Lower Traps
Scapular Retraction
Adduction toward spine
Prime mover: Middle Traps and Rhomboids
Scapular Protraction
Abduction (inflated lat syndrome)
Prime mover: Serratus Anterior
Concentric Movement
Against resistance
AKA Force production
Ex: upwards motion of bicep curl