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Weight Lifting Exercises & Their Affect On Different Muscle Fibers

Weight lifting exercises cause your musclesexercises such as weight lifting exercises
to generate heat and strength. Your musclesthat use heavy weight for very low reps, or
need to be strong, in order to help you move,sprinting.
breathe  and  so  on.
People who seem to be able to build muscle at
This article on weight lifting exercises willwill when performing almost any weight
look at the relationship between thelifting exercises, usually will have an
exercises you use when weight lifting andunusually large number of fast twitch muscle
your  muscles.fibers  in  their  body.
Your actual muscle tissue is made up of 2In the majority of people the muscle fiber
types of muscle fibers, actin, which are amake-up in each muscle group will be
slim fiber and myosin which are substantiallyrelatively equal in most muscle groups.
thicker. Both of these fiber types help toTherefore you need to recruit both slow
give your muscles a striated look about them.twitch and fast twitch fibers at some point
in  your  exercise  program.
When performing any exercises used in weight
lifting the muscle being exercised must beOne exception to the rule of equal types of
able to contract properly. To do this theymuscle fibers is when it comes to your
need to become stimulated by motor neurons.hamstrings. The hamstring muscles in the vast
These  are  simply  nerves.majority of people tend to be made up of
mostly  fast  twitch  muscle  fibers.
One motor neuron and the muscle fibers
stimulated during exercises used duringFor that reason, when performing weight
weight lifting activities are called a motorexercises for your hamstrings, you should try
unit. These motor units or muscle fibers playto use heavier weights for a lower number of
a large part in the force your muscles canreps.
produce  during  a  contraction.
Now, when executing any weight training
The more motor units you can activate duringexercises your muscles will go through a few
your weight lifting exercises the strongerdifferent actions. There are isometric,
the contraction. Meaning you'll be able toeccentric, concentric, and isotonic portions
lift a greater amount of weight for anof  most  weight  lifting  exercises;
increased  number  of  repetitions.
Isometric contractions can best be described
Your muscle fibers are categorized as Type I,as the same stress your muscle would go
Type IIa and Type IIb muscle fibers. The morethrough  when  pushing  against  a  wall.
common term for muscle fibers are "fast" and
"slow"  twitch.The lifting portion of weight training
exercises such as a dumbbell bicep curl is
When performing high rep weight trainingknown as the concentric contraction. Lowering
exercises it's your slow twitch muscle fibersthe dumbbell in a controlled fashion is the
(Type I) that will be recruited to do theeccentric  portion.
majority of the work. Your body uses this
type of muscle fiber when enduranceThe more common terms for this part of weight
activities, aerobic activity or high rep setstraining exercises are positive (concentric)
are  used.and  negative  (eccentric).
Fast twitch muscle fibers (Type IIa and TypeThe fourth type of contraction that can occur
Iib) are used by your body during explosiveduring weight exercises is the isotonic
contractions. It's these fibers that have thecontraction. This can occur more commonly
greatest potential for growth resulting fromduring  plyometric  training.
the  weight  lifting  exercises  you perform.
Patrick Mckeeman has very quick, easy &
Your body will used fast twitch muscle fiberseffective health & fitness solutions for you.
during high-intensity, short-duration



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