37 KB

K.2.S1.C.1b
Muscle Fibre Types
Type
Characteristics
Slow-Twitch
Muscle Fibre
Type I
(SO—slow oxidative)
Fast-Twitch
Muscle Fibre
Type IIA
(FOG—fast oxidative
glycolytic)
Fast-Twitch
Muscle Fibre
Type IIB
(FG—fast glycolytic)
Colour
red
pale red to white
white
Fatigue resistance
high
moderate
low
Myoglobin
concentration
(delivery of oxygen
to the muscles)
high
moderately high
low
Glycolytic capacity
(release of glycogen
within the muscles)
low
intermediate to high
high
Contractile speed
slow
fast
very fast
Aerobic capacity
high
moderate
low
Anaerobic capacity
low
high
high
Strength and power
low motor unit
strength;
low power output
high motor unit
strength;
high power output
high motor unit
strength;
high power output
Most active during
long distance
running/swimming/
cycling
weight lifting
short sprints;
explosive jumping
References:
Temertzoglou, Ted, and Paul Challen. Exercise Science: An Introduction to Health and Physical Education. Toronto,
ON: Thompson Educational Publishing, Inc., 2003.
Wilmore, Jack H., and David L. Costill. Physiology of Sport and Exercise. 3rd ed. Windsor, ON: Human Kinetics, 2004.
RM
S1-1