The Interplay of the Energy Systems over Time TIME
10 sec
0 sec
3 min
2 hrs +
AEROBIC SYSTEM
LACTATE SYSTEM
HIGH
ATP-CP SYSTEM
AEROBIC SYSTEM
MEDIUM
LACTATE SYSTEM
ATP-CP SYSTEM
AEROBIC SYSTEM
LOW
LACTATE SYSTEM
ATP-CP SYSTEM
0 sec
10 sec
3 min
2 hrs +
TIME
Lactate System producing lactate to utilise as preferred Aerobic System fuel
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P. J. L. Thompson, 2010, 2011
Glycolysis – Anaerobic and Aerobic Updated diagram with reversible reacFon added, according to research of Dr George A. Brooks. P.J.L. Thompson 1994 Newsholme EA, T Leech & G Duester 1994 www.newintervaltraining.com
Fuel Sources for ATP ProducFon CREATINE PHOSPHATE LACTATE ATP ADP+ P PROTEIN Energy for ContracFon GLYCOGEN FAT “Lactate is now recognised for its important metabolic funcFons and is a key substance used to provide energy, produce blood glucose and liver glycogen and promote survival in stressful situaFons. OxidaFon of lactate is one of our most important energy sources. In highly oxidaFve muscle fibres, lactate is the preferred fuel source.” Brooks GA 1988 www.newintervaltraining.com
The Lactate ShuYle Muscle Tissue
Veins
Fast Twitch
Fibre
Slow Twitch
Fibre
Arteries
Lactate
Mitochondria
Lactate formed in acFve Type IIb muscle fibres can reach adjacent Type I fibres where it is a preferred fuel and can be oxidised in the mitachondria to carbon dioxide and water. Alternately, lactate from Type IIb fibres can reach muscle capillaries and then go into the systemic circulaFon. Brooks GA 1988 www.newintervaltraining.com
Blood Lactate Levels •  Blood lactate levels are only a measure of lactate accumulaFon – not lactate producFon •  Lactate is constantly being added to the blood and at the same Fme being removed Lactate spilling into the blood minus Lactate removed from blood equals Lactate levels in the blood www.newintervaltraining.com