fibre types Flashcards
what is contractile speed
speed at which fibres contract
what is a mitochondria
site of aerobic energy production, provides large amounts of energy using O2
what are capillaries
provide blood to muscles, site of gas exchange (O2 and CO2)
what is myoglobin
O2 carrier/storage in muscle fibre (strong attraction to O2).
what is an aerobic reaction
produces energy with the presence of o2
what is an anaerobic reaction
produces energy without the presence of o2
what are the 3 types of muscle fibres
type 1- slow oxidative
type 2a- fast oxidative glycolytic
type 2b- fast glycolytic
what are the properties of type 1
-Type 1 MF are recruited for sub-maximal aerobic work
-Contract intermittently and produce LOW force
-They recover quickly and are available for recruitment in about 90 secs
-Can be performed daily as fibre damage is minimal
what are the properties of type 2
-Type 2 are recruited in only 2-20 secs, near muscle exhaustion or when maximal effort is required
-It is often accompanied by eccentric muscle fibre damage, causing DOMS.
-DOMS is felt 24-48 hours after exercise
what are the functional variation for slow oxidative fibres
contractile speed- slow
contractile strength-low
fatigue resistance- high
aerobic capacity- high
anaerobic capacity-low
what are the structural variations of slow oxidative fibres
colour- red
size-small
NO of mitochondria- many
NO of capillaries- many
myoglobin conc- high
glycogen stores- low
what are the structural variations of fast oxidative glycolytic
colour- red to pink
size- intermediate
NO of mitochondria- many
NO of capillaries- many
myoglobin conc - high
glycogen stores- intermediate
what are the structural variations of fast glycolytic
colour- white
size- large
NO of mitochondria- few
NO of capillaries- few
myoglobin conc- low
glycogen stores- high
what are the functional variation for fast oxidative glycolytic
contractile speed- fast
contractile strength- intermediate
fatigue resistance- moderate
aerobic capacity- moderate
anaerobic capacity- high
what are the functional variation for fast glycolytic
contractile speed- fast
contractile strength- high
fatigue resistance- low
aerobic capacity- low
anaerobic capacity- high
what sports are slow oxidative fibres best at
endurance events e.g marathon
what sports are fast oxidative glycocidic fibres best at
mix between endurance and power e.g 1500m
what sports are fast glycocidic fibres best at
power events e.g 110m hurdles
