Fibre Type
Contraction speed (mS) Size of motor neuronResistance to fatigue Activity Used for Efficiency Number of Mitochondria Capillary density Oxidative capacity Myoglobin content Glycolytic capacity ATPase levels |
Type I fibres
Slow (90-140 ms)Large small high Endurance type activities High High High High High Low Low |
Type II A fibres
Fast (50-100 ms) Large Intermidiate Short high intensityactivities Medim Medium Intermidiate Intermidate Medium High Intermidiate |
Type II B fibres
Very Fast (40-90 ms) Very Large Low Very short maximal intensity Activites Low Low Low Intermidate Low High High |