Chapter 14 & 18 Plyometrics and Flexibility

What happens to elastic energy in the musculotendinous components during a rapid stretch?

• It decreases and dissipates.

• It remains constant.

• It is increased and stored.

• It is converted to heat.

What occurs if a concentric muscle action follows immediately after a stretch?

• The energy is lost.

• The total force production decreases.

• The stored energy is released, increasing total force production.

• The muscle relaxes.

What is the role of the series elastic component (SEC) in muscle action?

• It dissipates energy.

• It stores elastic energy that increases the force produced.

• It reduces muscle tension.

• It prevents muscle contraction.

Which component is the primary source of muscle force during concentric muscle action?

• Series elastic component (SEC)

• Parallel elastic component (PEC)

• Contractile component (CC)

• Musculotendinous component

What does the parallel elastic component (PEC) exert during unstimulated muscle stretch?

• Active force

• No force

• Passive force

• Elastic force

What comprises the parallel elastic component?

• Cartilage and synovial fluid.
• Nervous tissue and blood vessels.
• Muscle fibers and adipose tissue.
• Connective tissues (epimysium,
  perimysium, endomysium, and sarcolemma).

What comprises the series elastic component?

• Muscles and ligaments
• Cartilage and synovial fluid
• Nerves and blood vessels
• the contractile component and the parallel elastic component

What does the neurophysiological model of plyometric exercise involve?

• Relaxation of muscles

• Potentiation of muscle contractile components

• Decrease in muscle velocity

• Inhibition of stretch reflex

What is the stretch reflex?

• Voluntary muscle contraction

• Involuntary response to muscle stretch

• Conscious muscle relaxation

• Deliberate muscle tension

What happens when muscle spindles are stimulated?

• Muscles relax

• Stretch reflex is inhibited

• Stretch reflex is stimulated, sending input to the spinal cord triggering reflexing muscle action

• Muscles contract voluntarily