P.E Chapter 9-Chronic Adaptation to Training Muscular System

• Increase o2 utilisation
• Increased muscle fuel stores
• Increased oxidisation of glucose and fats
• Adaption of heart muscle fibres

• The muscles have an increased ability to attacrt and use o2 in the cell
• Due to increase in the size and number of mitochondria and myoglobin stores in muscle
• Decrease in anaerobic glycolysis usage

Aerobic training leads to increase in muscle fuels such as glycogen, triglycerides and PC as well as the enzymes needed to break them down

• Due to training there is an increase in the ability of the aerobic system to metabolise fuels
• Glucose sparring due to body being more efficient at metabolising fats

Many fast twicth fibres in skeletal muscle switch to slow twitch with extended endurance training

• Type 1A Slow twitch
• Type 2A Fast twicth
• Type 2B fast twitch

• Red in colour
• Capable of high levels of aerobic ATP production
• They spilt ATP at a slow rate- good for endurance
• Hence slow contraction and very fatigue resistant

• Red in colour
• Produce high levels of aerobic ATP
• Split ATP rapidly- explosive movements
• Hence fast contraction
• Fatigue resistant

• White in colour
• ATP ceate through anaerobic processes
• Fast splitting of ATP- power movements
• Hence fast contraction
• Low fatigue resistance