Transcript Muscle movement and exercise - Kleins

Muscle movements
•
Types of muscle contractions
We have said so far that
muscles will contract or
shorten via the sliding
filament theory
•
This is true, however
shortening does not
always occur
•
Because of this fact we
have two types of
contractions
•
Types of muscle contractions
•
The two types of muscle
contractions that we can
experience are:
•
Isotonic contractions -“same tone”
•
Isometric contractions -“same measurement”
Isotonic Contractions
•
Isotonic contractions are
contractions that are
most familiar to us
•
This occurs when the
myofilaments are
successful in their sliding
movements
Isometric contractions
•
In Isometric movements
the muscles are rapidly
gaining tension but not
moving
•
This type of contraction
would occur if you tried to
lift a car with out the aid
of any tools.
Muscle tone
•
Muscle tone is an aspect
of skeletal muscle activity
that cannot be controlled
consciously.
•
Muscle tone is the state
of continuous partial
contractions.
Muscle tone
•
Muscle tone is the result
of different motor units,
which are scattered
through the muscle,
being stimulated by the
nervous system in a
systematic way
•
If muscle tone does not
occur, a muscle can be
come flaccid and even
atrophy
•
This is common in people
who are paralyzed.
The effect of exercise on
muscles
•
Muscles health follows a
simple pattern; “use it or
loose it”
•
If we do not use our
muscles they will get
weaker and atrophy
•
Regular exercise will
increase muscle size,
strength, and endurance.
Muscle Exercise
•
Aerobic or endurance
types of exercise such as
jogging, biking, running,
etc will result in stronger
more flexible muscles
with a greater resistance
to fatigue.
Aerobic Exercise
•
Aerobic exercise
strengthens muscles
mainly because we are
increasing the supply of
oxygen to the muscles
•
Increased oxygen means
more mitochondria for
more ATP creation
Aerobic exercise
•
Aerobic exercise will also
cause the hear to enlarge
so that more blood is
pumped, increase
metabolism, improve
digestion, and clear fats
from the bloodstream
•
Aerobic exercise will not
cause muscles to
increase in size
Resistance and isometric
exercise
•
The bulging muscles of a
body builder are the
result of resistance or
isometric exercises
•
In isometric exercise you
are increasing resistance
while the muscles are
forced to not contract
Resistance and isometric
exercise
• This isometric exercising
causes muscles to
increase due to
enlargement of individual
muscle cells ( the cells
make more contractile
filaments), instead of
increase in their number.
•
The amount of
connective tissue that
reinforces the muscle
also increases to keep up