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Physiology Lab Notes and Revision Questions
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  • Course
  • Exercise Physiology (18PSB211)
  • Institution
  • Loughborough University (LU)

Lab notes to give you a better understanding of: - The force velocity relationship - Finding out peak power - 2 models to explain the stretch shortening cycle (Neurophysiological and Mechanical) - the effect of increasing non-contractile mass. Includes diagrams, charts, and revision questions.

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Document information

  • April 27, 2020
  • 6
  • 2019/2020
  • Class notes
  • Unknown
  • All classes

Subjects

  • exercise physiology
  • physiology lab
  • finding out peak power
  • stretch shortening cycle
  • countermovement jump
  • wingate tests
  • neurophysiological model
  • the force velocity relationship
  • non contractile mass

Written for

  • Loughborough University (LU)
  • Sport and Exercise Physiology
  • Exercise Physiology (18PSB211)
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Lab Session 1

Power-velocity relationships during sprint cycling and Wingate Tests

Strength: Maximum force generated by a muscle
 Low velocities
 High forces

Speed: Maximum velocity
 High velocities, low forces

Power = Force (N) x Velocity
 Strength x speed

Measuring Force and Contraction Velocity in an Isolated Muscle


You can attach a muscle to a force transducer at one end
and a fulcrum with weight at the other. The weight will
stretch the muscle, and then by stimulating the muscle
electrically you can measure the force and velocity of the
muscle.


The Force Velocity Relationship

When force is high velocity is low and when velocity is high force is low.

This is because with a very high velocity
contraction less myosin heads are attached
to actin at a time because as they pull actin
across they have to release in order to keep
actin sliding across.

Whereas in order to produce a high force
you need more myosin attached to actin
and therefore you cannot contract quickly.


When you calculate power you create
an inverted u shaped curve and your

Maximum power is at about a third of
your maximum contraction velocity

Shape of force velocity curve is
dependent on fibre type in the muscle

– Fast twitch fibres are able to express
not only higher peak tensions but also
higher forces at higher velocities

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