 In high intensity exercise longer than 2 seconds ATP is resynthesized using PC (stored in muscles) CP High energy bond PC stores are limited so ATP.

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Presentation transcript:

 In high intensity exercise longer than 2 seconds ATP is resynthesized using PC (stored in muscles) CP High energy bond PC stores are limited so ATP can only be resynthesized in this way for upto 10 seconds

 This process involves 2 immediate reactions which take place within the muscle cell sarcoplasm.  When PC is broken down energy is released: CP Energy

CP Same energy is then used to resynthesize ATP Energy ADPATPP PC => P + C + Energy (Exothermic Reaction) Energy + ADP + P => ATP (Endothermic Reaction) Enzyme responsible for the breakdown of PC is Creatine Kinase

 When energy produced by one reaction is used in another reaction it is known as a COUPLED REACTION.  Therefore the resynthesis of ATP using PC is a COUPLED REACTION  The breakdown of PC is ANAEROBIC.

 Which of the following activities use the ATP- PC system? (you must be able to justify your choice(s))

 Correct Answers:  Why? – because they all last less than 10 seconds  Wrong Answers:  Why ? – Because they last longer than 10 seconds

 No Oxygen is used and no lactic acid is formed in this system – therefore it is also called the Alactic Anaerobic System  The main advantage of the ATP-PC system = it is a very immediate source of energy

 When hard exercise is longer than 10seconds (beyond ATP-PC threshold) and all PC is used up, ATP then has to be resynthesized by a different system – LACTIC ACID SYSTEM  Therefore the point at which we switch from the ATP-PC System to the Lactic Acid System is known as the ALACTIC-LACTIC THRESHOLD

 Speed endurance and power athletes use anaerobic work in order to delay the onset of the Alactic-Lactic Threshold.  Anaerobic work causes biological adaptations that allow muscle cell sarcoplasm to contain more ATP and creatine so ATP-PC system provides energy for longer at the highest possible rate.  Some athletes use daily Creatine supplements to increase the total muscle creatine.

 Complete the Homework sheet for next lesson.