Plyometric training Flashcards
What is plyometrics?
A pre-stretch (countermovement) followed by a forceful contraction
What are 2 reasons for increased force?
Both mechanical and neural
What happens at the ‘parallel elastic component’?
A passive force is exerted with unstimulated muscle stretch
What body parts are involved in the parallel elastic component?
Epimysium, perimysium, endomysium and sarcolemma
What happens at the contractile component?
Primary source of muscle force during concentric action
What happens at the series elastic component?
When stretched, acts as a spring and stores elastic energy that increases force production
If a concentric action does not follow the stretch, what is the energy released as?
Heat energy
How long does the concentric action have following the eccentric action?
1 second
What happens when muscle spindles are stimulated?
Stretch reflex is released, sending input via the spinal chord to Type 1 nerve fibres
What is another name for type 1 nerve fibres?
Afferent nerves
What is the stretch reflex?
Involuntary response to an external stimulus that stretches the muscle
What are the 3 phases of plyometric action?
Eccentric phase, amortisation phase and concentric phase
What is another name for amortisation phase?
Electromechanical delay
What is stretched during the eccentric phase?
Muscle agonist
What happens to the muscle spindles during the eccentric phase?
They stretch
