Exercise Metabolism

Exercise Metabolism

1. Muscle fibers

   • Type 1 or "slow-twitch"
   • Type 2 or "Fast Twitch"

2. energy source

   • ATP produced pathway
     • ATP-PC systems
     • Glycogen-lactate syatem
     • aerobic metabolism
   • ATP
     • immediate source of energy
   • phosphocreatine
     • high amount of phosphate bonds
     • 3-8 times for than ATP
   • at rest
     • almost 100% - aerobic metabolism
     • lactate level low
   • during exercise
     • alactic anaerobic source
     • lactic anaerobic source
     • aerobic source

3. Energy transition

   • ATP production immediately
   • O uptake
   • iniatial ATP production
     • anaerobic pathway
   • O deficit
     • Lag O uptake in the beginning of exercise

4. VO max

   • max. ability of the body to deliver & utilize O and its related to ability to perform prolonged exercise
   • factors affecting
     • age
     • gender
     • altitude

5. O uptake during recovery

   • EPOC
     • recovery period after exercise
   • excess O os used to
     • light exercise
       • resynthesis of PC
       • replenish muscles & blood O stores
     • heavy exercise
       • conversion of lactic acid - glucose
       • AMP & ADP - ATP
       • HR & RR
       • body temp.
       • hormones

6. Exercise intensity & fuel selection

   • low intensity(primary)
     • fats
   • high intensity (primary)
     • carbohydrate
   • "crossover" concept
     • shift (fat-CHO) metabolism
       • increase
         • recruitment of fast muscle fibres
         • blood level of epinephrine

7. muscle fatigue

   • transient in performance capacity of muscles
   • caused by
     • O def.
     • accumulation of metabolites
   • cardic muscle (no fatigue)
     • built in mechanism ( rhythmical contraction independently)
     • striated & multinucleated (control by ANS & continously contracts)
     • blood supply (rich in O )
     • many more mitochondria ( produce more ATP)