Chapter 5 - Energy Systems Flashcards
what is the fuel for the ATP-PC system?
PC
where is PC stored and how does it break down?
stored in muscle and breaks down anaerobically
what is the yield and rate of ATP resynthesis in ATP-PC system?
yield is low (o.7-1), rate is fastest
ATP-PC system is used for what intensity and timeframe?
very high intensity (95-100% max HR), 0 to 5-15 secondss
how much ATP is already stored in the muscle?
very limited amount, only enough for about 1 or 2 contractions
where are ATP molecules stored?
muscle fibres
how does the ATP-PC system produce energy for muscular contractions?
- bond between second and third phosphate breaks, releasing energy for muscular contraction
- the breakdown of PC provides energy for the resynthesis of ADP and Pi to become ATP
what is the fuel for the anaerobic glycolysis system?
carbohydrates (glucose stored as glycogen in muscle and liver)
what is the yield and rate of ATP production in anaerobic glycolysis system?
yield is low (2-3), rate is fast
anaerobic glycolysis system is used for what intensity and timeframe?
high intensity (85-95% max HR), short duration of 15 up to 30-60 seconds
what is the by-product of this system?
lactic acid (lactate and H+ ions)
how does the anaerobic glycolysis system produce energy for muscular contractions?
the breakdown of glucose produces ATP for muscular contractions
what is the fuel for the aerobic system?
carbs, fats and proteins (in extreme circumstances)
what is the yield and rate of ATP production in the aerobic system?
yield is high (38), rate is slowest
aerobic system is used for what intensity and time frame?
activities at sub-max intensity 80% max HR, long duration from 90 seconds
what is the preferred fuel source ?
glucose/glycogen
what are high GI foods?
those which are rapidly digested and absorbed and are often most useful as a dietary recovery strategy. Impacts blood glucose levels quickly
what are low GI foods?
slowly digested and absorbed and are most useful to provides extended/endurance activity with on-going energy sources. Impact blood glucose level slower and more controlled
when should low GI foods be consumed?
pre-event
when should high GI foods be consumed?
during event and post event during recovery
what is glycogen sparing?
a long term adaptation that allows fats to be used more readily and earlier during performance, this results in less use of the anaerobic glycolysis system and allows glycogen to be used much later in performance
how does the aerobic system produce energy for muscular contractions?
glucose is broken down to pyruvate and in the presence of sufficient oxygen it is further broken down to produce 38 ATP
