1 / 18

(2) ENERGY PRODUCTION IN EXERCISE KUORMITUKSESSA

(2) ENERGY PRODUCTION IN EXERCISE KUORMITUKSESSA. Immediate energy stores Anaerobic glykolysis Aerobic energy production. IMMEDIATE ENERGY STORES. = Hi-energy phosphates adenocine-triphosphate (ATP) and creatinephosphate (CP) – stores.

otto
Download Presentation

(2) ENERGY PRODUCTION IN EXERCISE KUORMITUKSESSA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. (2) ENERGY PRODUCTION IN EXERCISE KUORMITUKSESSA

  2. Immediateenergystores • Anaerobicglykolysis • Aerobic energyproduction

  3. IMMEDIATE ENERGY STORES = Hi-energyphosphatesadenocine-triphosphate (ATP) and creatinephosphate (CP) –stores ATP: storage in cells 80-100 g (in musclesabout 50%, enough for max. work of 2-3 s ) CP (PCr): stores 4-6 x that of ATP-stores (sufficient for maximalwork for 10 s ) -reactionsdon’treguireoxygen

  4. ATP and CP-stores in exercise

  5. Recovery of hi-energyphosphates is veryquick!

  6. Creatineloading (creatiinimonohydrate, CrH2O) hasbeenshown to enhanceperformance in shortmaximalbouts, addsalsobodyweight

  7. Maximalbouts of action: 1. Under 30 s ATP ja KP 2. 30s – 1½ min ATP, CP ja anaero- bicglykolysis 3. 1½-3 min Anaer. ja aer. glykol. 4. Over 3 min Aerobic energyproduction

  8. ANAEROBIC GLYCOLYSIS • Glucose/glycogen→ pyruvicacid→lacticacid • - no oxygenneeded (anaerobic) • 10 steps • occurs in watery medium of cell • only2/3 molecules of ATP is formed/glucose/glycogenmolecule,alsohydrogen is produced to electrontransferchain • activity of glycolysisdepends on the amount/activity of regulatoryenzymes, amount of oxygen and availability of glucose • end-productis pyruvicacidwhich is sent to aerobic processKrebscycle • some of the pyruvicacid is turned into lacticacid

  9. Glucose from blood into cell • breakdown of muscle glycogen more economical (net result 3 ATP molecules) 2 ATP:tä kuluu - FT-cells contain more PCK (most important regulatory enzyme) In very heavy work all 6 hydrogen ions cannot be transformed with oxygen in electron transfer chain - acidosis

  10. Lacticacid is split into lactate and hydrogenions • Lactate is moved into bloodstream • even at restthere is somelactate in blood (redbloodcells and FT-cells) • used in energyproduction in muscles,especiallyheart • gluconeogenesis (Coricycle in liver) transformslactate into glucosewhenenoughoxygen is available in lesspowerfulwork

  11. Cori cycle

  12. On the otherhand: • lactate is produced in musclesevenwhenthere is no lack of oxygen • lactate is alsoproduced in liver,skin and heart • lactate is the mostimportantenergysource of heart in heavy work

  13. use of immediate energy sources and anaerobic glycolysis are parallel energy sources • lactate starts to accumulate in working muscles before hi-energy phosphates are fully used

  14. transfer of lactate from blood is fastest at work rates of 30-45 % VO2max in cycle ergometer work • on treadmill power should be 55-60 % VO2max

  15. muscular exhaustion is not equal to amount of lactate in muscle • - Lactate accumulation and lowering of muscle pH both play a role in muscular exhaustion • diminishing muscle glycogen stores and hi-energy phosphates are also important factors in exhaustion • other apparent reasons are at central nervous system level and in neuromuscular junctions

  16. Minutes

More Related