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Is there such thing as a balance score?
No, too complex to have a single score. Multifunctional skill.
In a passive system, if the COM is pushed outside of the base of support, what happens?
it falls over
When a person initiates gait, the COM moves outside the BOS, why don't they fall?
the step to move the COM forward
Three mechanical reasons humans are unstable
COM is high, BoS is small, leg joints can lead to vertical collapse
Four behavioral properties of a musculotendinous unit
extensibility, elasticity, irritability, ability to develop tension/force
when a person initiates a forceful stretch of a muscle group immediately before contracting that muscle group
what are the four roles of assumed by muscles during movement?
agonist, antagonist, stabilizer, neutralizer
cannot stretch full range of motion due to tightness of stretched multi-joint muscle on opposite side
what factors affect muscular force generation
fiber type, muscle size, # of fibers, and pennation angle
when body temp. increases, what 5 changes occur?
increase speed of nerve conduction, muscle function, oxygen supply, and waste removal. decrease in the number of motor units needed to sustain Cx
Law of Inertia
A body will maintain a state of rest or constant velocity unless acted on by an external force that changes the state
Law of Acceleration
An applied force causes an acceleration of the body:
1.with a magnitude proportional to the force,
2.in the direction of the force, and
3.inversely proportional to the mass.
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