7 Flashcards
What is the imaginary line that bisects the body into right and left halves?
Sagittal
(flexion / extension)
What is the imaginary line that bisects the body into anterior and posterior halves?
Frontal
(abduction / adduction)
What is the imaginary line that bisects the body into superior and inferior halves?
Transverse
(rotation)
Concentric muscle action
Muscle shortens, think acceleration.
Example: Lifting a weight during a bicep curl.
Eccentric muscle action
Muscles lengthen (stronger eccentrically), think negatives in the gym.
Example: Lowering a weight during a bicep curl.
Isometric muscle action
Muscle stays the same length, think plank.
Example: Holding a plank position.
Isokinetic muscle action
Speed of movement is fixed (high-end piece of equipment.)
Feed-forward activation
STABILZATION FACT, certain muscles automatically activate in anticipation of a movement.
Open kinetic chain exercise
Distal segment is moving i.e. leg curl / bench press / lat pull-down
Closed kinetic chain exercise
Distal segment is fixed i.e. squats / pull-ups / lunges
Altered Reciprocal Inhibition
Agonist receives signal functional antagonist receives inhibitory signal allowing it to lengthen.
Stretch Shortening Cycle
Loading of a muscle eccentrically to prep for a rapid contraction (jumping, NOT TINKERBELL JUMPS) the energy is stored in the series elastic component (tendon) and the transition between the eccentric and concentric portion is rapid and termed amortization.
Force velocity curve
As the velocity of a concentric action increases, its ability to produce force DECREASES; during an eccentric action, as velocity increase, the ability to develop force also INCREASES.
First Class Lever
Nodding the head
Second Class Lever
Plantarflexion / push-up.
Third Class Lever
Biceps Curl. Most limbs in the body are these (hamstring curl)
Agonist, synergist, stabilizer
⬆️⬇️
Always rotator cuff for upper, transverse abs for lower
