responses to incremental exercise

what is maximum steady state

boundary between heavy and severe domains

what happens when you go above maximum steady state

exercise is no longer sustainable so muscles fatigue

• Above this point aerobic systems can't produce ATP fast enough to maintain the intensity

• The shortfall in the rate of ATP production is met by the anaerobic system

• The anaerobic system supplements the aerobic system

• No switch over from aerobic to anaerobic - they work together

what is the severe domain exercise

• No steady state

• During constant intensity exercise

  • VO2 continues to rise during until it reaches VO2 max

  • Progressive build-up of metabolic waste products e.g. lactate and hydrogen ions (more hydrogen ions makes more acidic so enzymes work slower)

  • Exercise intensity can't be maintained for long borrowed time

  • Progressive recruitment of muscle fibres

• Fatigue is reached when anaerobic capacity is depleted

 

what is the extreme domain

• No steady state

• Exercise above VO2 max

• Fatigue occurs rapidly usually less than 2 mins

• During constant exercise

  • VO2 continues to rise but doesn't reach VO2 max

  • Rapid build-up of metabolic waste products

  • Progressive recruitment of muscle fibres

  • Loss of force production

  • Possible failure of excitation-contraction coupling

endurance time in moderate domain

more than 4 hours

endurance time for heavy domain

40 mins to 3-4 hours

endurance time for severe domain

2-40 mins

endurance time for extreme domain

less than 2 mins