Metabolism & Performance: Chapter 3.5 PDF

1   Exercise intensity determines the primary energy system utilized  Higher intensity – demands faster production of ATP  Lower intensity – can use slower, more efficient means of ATP production  At no t...

1   Exercise intensity determines the primary energy system utilized  Higher intensity – demands faster production of ATP  Lower intensity – can use slower, more efficient means of ATP production  At no time, during either exercise or rest, does any single energy system provide the complete supply of energy. Tab. 2.3. Baechle et al. 2008. 2 Essentials of Strength… Human Kinetics   Phosphagens Stored ATP can last for 3‐5 sec, while phosphocreatine (PCr) can decrease markedly (50‐70%) during the first stage (5‐30 seconds) of high‐intensity exercise and can be almost eliminated as a result of very intense exercise to exhaustion. Complete resynthesis of ATP appears to occur within 3 to 5 minutes Complete PCR resynthesis can occur within 8‐10 min. 33   Glycogen The rate of glycogen depletion is related to exercise intensity. At relative intensities of exercise above 60% of maximal oxygen uptake, muscle glycogen becomes an increasingly important energy substrate; the entire glycogen content of some muscle cells can become depleted during exercise. Repletion of muscle glycogen during recovery is related to postexercise carbohydrate ingestion. 44   Recall that high‐intensity exercise can induce metabolic acidosis.  If working at a high‐intensity, then your muscles will make lactate to help get rid of some of that acidity.  A cooldown of low‐intensity exercise will help keep your blood flow up to flush out excess acidity and lactate. 55  3? Do not need to memorize every number, but just need to be able to explain the primary bioenergetic limiting factor for each event. 6Baechle et al. 2008. Essentials of Strength… Human Kinetics  3? How could dietary supplements help? 7Baechle et al. 2008. Essentials of Strength… Human Kinetics Tab. 3.4. Haff et al. 2016. Essentials of Strength… Human Kinetics Table 2.5 This version of the table is from the newest edition of the textbook. It is more complex and I only want you to know the information from the previous slide. 8   What is the appropriate time frame / techniques for recovering your substrates and energy systems?  What are the primary bioenergetics limiting factors for specific sporting events? What specific dietary supplements would be beneficial to mitigate some of these limiting factors? 9   Haff & Triplett. Essentials of Strength Training & Conditioning, 4th edition. Human Kinetics, 2016.  Baechle & Earle. Essentials of Strength & Conditioning, 3rd edition. Human Kinetics, 2009. 10 10