neuromuscular system Flashcards
slow twitch muscle fibres are also known as
type 1 muscle fibres
type 2 a are also known as
fast oxidative glycolytic fibres
type 2 b are also known as
fast glycolytic
what are the 6/7 things to remember when describing muscles fibres
how fast they contract
aerobic or anaerobic
blood cells and colour
myoglobin+ mitochondria levels
fatigue?
sporting examples
type 1- slow twitch muscle fibres
contract slowly
produce small power
do not fatigue quickly
aerobically powered
high rbc content that carries o2
high myoglobin + mitochondria
long dist, endurance events eg walking and marathon
type 2a - fast twitch
contract quickly and with power- mid
anaerobically powered but do use small percentage of oxygen
fatigue fairly quickly
limited red blood cells and appear pink
fewer myoglobin and mitochondria than type 1
quick events that involve prolonging power, speed and explosive qualities (1-2 mins) eg 400m and 800m running
type 2b - fast twitch
contract the quickest and with the most power
powered anaerobically
have minimal o2 supply and use ATP/PC energy system
they are white as they have few to zero rbcs
have no myoglobin and mitochondria
fatigue very quickly
fast explosive events 100m sprint, shot, discus
major storage fuel for type 1 fibres
triglycerides
major storage fuel for type 2a
glycogen
major storage fuel for type 2b
PC
myosin ATPase levels for type 1
low
myosin ATPase for type 2a
intermediate
myosin ATPase for type 2b
high
glycogen stores for type 2a
high
glycogen stores for type 1
low
glycolytic capacity for type 1
low
glycogen stores for type 2b
very high
glycolytic capacity for type 2a
high