2. Module 1. Applied Physiology- Performance and Endurance Flashcards
I need to prepare an abstract for this topic, what is it about?
Dependencies of muscle force and power
What is the aim of this module?
Review core Physiological components and expand beyond textbook level using private study
What is meant by the length tension relationships in muscle
Demonstrates at what sarcomeric size the force produced by muscle fibre.
What is passive vs active force production
Passive- Unconcious- produces less elongation
Active- Conscious, produces greater elongation
What is the curve of isometric maxima
A curve we should know quite well!
For any given sarcomeric length. am isometric (non shortening) is produced
The produced force is charted as force over length
What is a sarcomere?
Unit of muscle
What is an isotonic contraction?
When muscle is activated the force production of the muscle increases until the load is met.
The muscle will contract to life the weight
What is an isometric contraction?
The muscle will again activate to produce force, however this time the opposing force cannot be overcome
The muscle will not contract.
What components contribute to contraction of skeletal muscle
Contractile elements (active contraction)
Passive elements (spring force of muscles)
Tendon elasticity
First bit of homework.
How is a muscle able to produce passive stretching
Which elements of the muscle are responsible for passive force
What causes the optimal force zone in the length tension relationship?
Cross bridging.
At low lengths there are not enough available binding sites as they are too close together
The reverse is true at high lengths, as the fibres are too far apart and will not join
What described in the Hill equation of force velocity?
The speed of contracting muscle and its relationship to force and power (force times velocity)
What do we know about the relationship between force and velocity in terms of the hill equation
When the force is greatest velocity will be zero.
Concurrently when force is zero the velocity will be the greatest
(muscles contract quickest when they are not required to output force)
How can we use the hill equation to infer the relationship between force, velocity and power?
If we say power is work over time
we can also say work is equal to force x distance
Therefore power is equal to force times velocity
