Presentation is loading. Please wait.

Presentation is loading. Please wait.

(2) ENERGY PRODUCTION IN EXERCISEKUORMITUKSESSA. 1.Immediate energy stores 2.Anaerobic glykolysis 3.Aerobic energy production.

Similar presentations


Presentation on theme: "(2) ENERGY PRODUCTION IN EXERCISEKUORMITUKSESSA. 1.Immediate energy stores 2.Anaerobic glykolysis 3.Aerobic energy production."— Presentation transcript:

1 (2) ENERGY PRODUCTION IN EXERCISEKUORMITUKSESSA

2 1.Immediate energy stores 2.Anaerobic glykolysis 3.Aerobic energy production

3 = Hi-energy phosphates adenocine-triphosphate (ATP) and creatinephosphate (CP) –stores IMMEDIATE ENERGY STORES ATP:storage in cells g (in muscles about 50%, enough for max. work of 2-3 s ) CP (PCr): stores 4-6 x that of ATP- stores (sufficient for maximal work for 10 s ) -reactions dont reguire oxygen

4 ATP and CP-stores in exercise

5 Recovery of hi-energy phosphates is very quick!

6

7 Creatine loading (creatiinimonohydrate, CrH 2 O) has been shown to enhance performance in short maximal bouts, adds also body weight

8 1. Under 30 s ATP ja KP 2. 30s – 1½ min ATP, CP ja anaero- bic glykolysis 3. 1½-3 min Anaer. ja aer. glykol. 4. Over 3 min Aerobic energy production Maximal bouts of action:

9 ANAEROBIC GLYCOLYSIS Glucose/glycogen pyruvic acid lactic acid - no oxygen needed (anaerobic) - 10 steps - occurs in watery medium of cell - only 2/3 molecules of ATP is formed/glucose/glycogen molecule,also hydrogen is produced to electron transfer chain - activity of glycolysis depends on the amount/activity of regulatory enzymes, amount of oxygen and availability of glucose -end-product is pyruvic acid which is sent to aerobic process Krebs cycle -some of the pyruvic acid is turned into lactic acid

10 2 ATP:tä kuluu - FT-cells contain more PCK (most important regulatory enzyme) - breakdown of muscle glycogen more economical (net result 3 ATP molecules) Glucose from blood into cell In very heavy work all 6 hydrogen ions cannot be transformed with oxygen in electron transfer chain - acidosis

11 -Lactic acid is split into lactate and hydrogen ions -Lactate is moved into bloodstream - even at rest there is some lactate in blood (red blood cells and FT-cells) - used in energy production in muscles,especially heart - gluconeogenesis (Cori cycle in liver) transforms lactate into glucose when enough oxygen is available in less powerful work

12 Cori cycle

13 On the other hand: - lactate is produced in muscles even when there is no lack of oxygen - lactate is also produced in liver,skin and heart - lactate is the most important energy source of heart in heavy work

14 - 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

15 - transfer of lactate from blood is fastest at work rates of % VO 2 max in cycle ergometer work - on treadmill power should be % VO 2 max

16 - 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

17 Minutes

18


Download ppt "(2) ENERGY PRODUCTION IN EXERCISEKUORMITUKSESSA. 1.Immediate energy stores 2.Anaerobic glykolysis 3.Aerobic energy production."

Similar presentations


Ads by Google