Energy Supply

Energy supply

a. ATP à ADP + energy

b. Creatine phosphate + ADP à creatine + ATP (anaerobic , alactic)

c. Glucose + ADP à lactic + ATP (anaerobic, lactic)

d. Glucose + oxygen + ADP à carbon dioxide + ATP + water (aerobic, alactic)

e. Fat + oxygen + ADP à carbon dioxide + ATP + water (aerobic, alactic)

Classification of maximum activity of various duration together with energy – supplying system for this activity
duration	Classification (aerobic/ anaerobic)	Enrtgy supplied by	Observations
1-4 sec	Anaerobic, alactic	ATP
4-20 sec	Anaerobic, alactic	ATP +CP
20 – 45 sec	Anaerobic, alactic	ATP + CP +	High lactate production
	+ anaerobic, lactic	Muscle glycogen
45-120 sec	Anaerobic, alactic	Muscle glycogen	with increasing
			duration,
			decreasing lactate
			production
120- 140 sec	Aerobic + anaerobic,	Muscle glycogen	ditto
	lactic
240-600 sec	Aerobic	Muscle glycogen	With increasing
		+ fatty acids	Duration higher
Etc			Share of fats

Various substrates for energy supply and their characteristics
Substrate	breakdown	availability	Speed of energy production
Creatine phosphate (CP)	Anaerobic, alactic	Very limited	Very fast
Glycogen or glucose	Anaerobic, lactic	limited	fast
Glucose or glycogen	Aerobic, alactic	limited	slow
Fatty acids	Aerobic, alactic	unlimited	sluggish

Reference:

Training Lactate Pulse-Rate by Peter GJM Janssen