Antagonistic Muscle Action Flashcards
What is an agonist?
(Prime Mover)
> The contracting muscle that is responsible for the movement taking place.
What is an antagonist?
> The muscle that relaxes to allow the movement to take place.
(by opposing the agonist to prevent overstretching).
What is a fixator?
(Stabiliser)
> The muscle that stabilises a joint by eliminating any unwanted movement at the joint.
What is a synergist?
(Helper)
> Works with the agonist by supporting its action - (by neutralising any unwanted movement at the joint, and assisting to agonist to perform the desired movement.
What are the agonist and antagonist during flexion of the arm at the elbow?
Agonist = Bicep Brachii
Antagonist = Tricep Brachii
e.g. Upwards phase of a bicep curl
What are the agonist and antagonist during extension of the arm at the elbow?
Agonist = Tricep Brachii
Antagonist = Bicep Brachii
e.g. Downwards phase of a bicep curl
What are the agonist and antagonist during flexion of the leg at the knee?
Agonist = Hamstring Group
Antagonist = Quadricep group
e.g. Preparing to kick a football
What are the agonist and antagonist during extension of the leg at the knee?
Agonist = Quadricep Group
Antagonist = Hamstring Group
e.g. Follow through after kicking a football
What are the agonist and antagonist during flexion of the leg at the hip?
Agonist = Psoas Major
Antagonist = Gluteus
e.g. Long jump (flight phase)
What are the agonist and antagonist during extension of the leg at the hip?
Agonist = Gluteus
Antagonist = Psoas Major
e.g. Preparing to kick a football
What are the agonist and antagonist during dorsi-flexion of the foot at the ankle?
Agonist = Tibialis Anterior
Antagonist = Gastrocnemius
e.g. Leading foot in hurdles
What are the agonist and antagonist during planter-flexion of the foot at the ankle?
Agonist = Gastrocnemius
Antagonist = Tibialis Anterior
e.g. Pike jump in trampolining
What is the agonist during horizontal flexion of the arm at the shoulder?
Agonist = Pectoralis
e.g. Release phase of a discus throw
What is the agonist during horizontal extension of the arm at the shoulder?
Agonist = Trapezius
e.g. Preparation phase of a discus throw
What is the agonist during abduction of the arm at the shoulder?
Agonist = Deltoid
e.g. Outward movement of a star jump/breaststroke
What is the agonist during adduction of the arm at the shoulder?
Agonist = Latissimus Dorsi
e.g. Inward movement of a star jump/breaststroke
