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Fit & Well Chapter 4
Muscle Strenght and Endurance
29
Fitness
Undergraduate 1
01/29/2010

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Term
muscle fiber
Definition
A single muscle cell, usually classified according to strength, speed of contraction, and energy source.
Term
myofibrils
Definition
Protein structures that make up muscle fibers.
Term
hypertrophy
Definition
An increase in the size of muscle fibers, usually stimulated by muscular overload, as occurs during strength training.
Term
atrophy
Definition
A decrease in the size of muscle fibers.
Term
hyperplasia
Definition
An increase in the number of muscle fibers.
Term
slow-twitch fibers
Definition
Red muscle fibers that are fatigue-resistant but have a slow contraction speed and a lower capacity for tension; usually recruited for endurance activities.
Term
fast-twitch fibers
Definition
White muscle fibers that contract rapidly and forcefully but fatigue quickly; usually recruited for actions requiring strength and power.
Term
power
Definition
The ability to exert force rapidly.
Term
motor unit
Definition
A motor nerve (one that initiates movement) connected to one or more muscle fibers.
Term
muscle learning
Definition
The improvement in the body's ability to recruit motor units, brought about through strength training.
Term
tendon
Definition
A tough band of fibrous tissue that connects a muscle to a bone or other body parts and transmits the force exerted by the muscle.
Term
ligament
Definition
A tough band of tissue that connects the ends of bones to other bones or supports organs in place.
Term
testosterone
Definition
The principal male hormone, responsible for the development of secondary sex characteristics and important in increasing muscle size.
Term
repetition maximum(RM)
Definition
The maximum amount of resistance that can be moved a specified number of times.
Term
repetitions
Definition
The number of times an exercise is performed during one set.
Term
static(isometric) exercise
Definition
Exercise involving a muscle contraction without a change in the length of the muscle.
Term
dynamic(isotonic) exercise
Definition
Exercise involving a muscle contraction with a change in the length of the muscle.
Term
concentric muscle contraction
Definition
A dynamic contraction in which the muscle gets shorter as it contracts.
Term
eccentric contraction
Definition
A dynamic contraction in which the muscle lengthens as it contracts; also called a pliometric contraction.
Term
constant resistance exercise
Definition
A type of dynamic exercise that uses a constant load throughout a joint's entire range of motion.
Term
variable resistance exercise
Definition
A type of dynamic exercise that uses a changing load, providing a maximum load throughout the joint's entire range of motion.
Term
eccentric(pliometric) loading
Definition
Loading the muscle while it is lengthening; sometimes called negatives.
Term
plyometrics
Definition
Rapid stretching of a muscle group that is undergoing eccentric stress, followed by a rapid concentric contraction.
Term
speed loading
Definition
Moving a load as rapidly as possible.
Term
isokinetic
Definition
The application of force at a constant speed against an equal force.
Term
spotter
Definition
A person who assists with a wight training exercise done with free weights.
Term
set
Definition
A group of repetitions followed by a rest period.
Term
agonist
Definition
A muscle in a state of contraction, opposed by the action of another muscle.
Term
antagonist
Definition
A muscle that opposes the action of another muscle.
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