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49-2 Effects of Aging on muscles - Coggle Diagram
49-2
Effects of Aging on muscles
Fiber number and
fiber type changes
Skeletal muscle strength decreases
as a result of Sarcopenia
Sarcopenia is a condition characterized by loss of skeletal muscle mass and function. Although it is primarily a disease of the elderly, its development may be associated with conditions that are not exclusively seen in older persons
Loss of muscle fibers
Decrease in size of existing fibers
Proportion of type I and type II fibers
remains constant
Gradual decrease
in the no and size of
type II fibers
for those who are- inactive
Meaning that
relatively type I fibers will be more
Decrease in the number of motor units
Higher number of fibers per motor unit
Connective tissue changes in skeletal muscles
Amount of connective tissues within the extracellular matrix increases
Decrease ROM
Increased muscle stiffness
Decreased muscle strength
and loss in muscle power
(ability to contract the muscles
with high force and high velocity)
A cause for frequent fall in elderly
Effects of resistance training on aging muscles
Positive effects
Increase in the size of muscle fibers
Increase in strength and
functional performance
Response to resistance training is
limited compared to young people