FOUNDATIONS OF STRENGTH
& CONDITIONING
ES 342—Spring 2010
Today
y
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Syllabus
y
Introductions
Focus of the Course
Goals
NSCA (www.nsca-lift.org)
(
g)
 NSCA-CPT
 CSCS
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What do you remember?
Lecture
What do y
you remember?
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Movements and their primary AGONISTS?
Exercise Types?
Muscle Contraction Types?
Muscle Fiber Types?
E
Energy
Transfer?
T
f ?
 ENERGY
source?
 Primary
Pi
substrates
b
for
f training?
i i ?
Why are these a big deal? How will
you use this information?
What pieces are there to the muscle
puzzle?
l ? What
Wh t makes
k up a muscle?
l ?
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Muscle Tissue
Nervous Tissue
Blood Vessels
Connective Tissue
The Motor Unit
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A motor unit consists of a
motor neuron and the
muscle fibers it innervates.
There are typically
several hundred muscle
fibers in a single motor
unit.
Key
y Point

The discharge of an action potential from a motor
nerve signals the release of calcium from the
sarcoplasmic
p
reticulum into the myofibril,
y
, causing
g
tension development in muscle.
Activation of Muscles

Arrival of the A-P at the nerve terminal causes the
release of acetylcholine
 When
enough acetylcholine is released, an action
potentiall is generated
d at the
h sarcolemma
l
 Sarcolemma carries A-P information throughout the
fiber signaling Ca2+ release
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Control of a muscle depends on the number of
muscle fibers within each MU
 Muscles
that function with great precision
 Muscles that require less precision
Muscle Fiber

Sectional view of a muscle fiber (Figure 1.3)
What are these
little things in
the myofibril?
Myosin
y
and Actin
Sliding-Filament
g
Theory
y States:
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Actin filaments at each
end of the sarcomere
slide inward on myosin
y
filaments
This p
pulls the Z-lines
toward the center of the
sarcomere and shortens
the muscle fiber