Immediate source of energy is ?
a) Cori’s cycle
b) HMP
c) ATP
d) TCA cycle
Correct Answer - C
Ans. is ‘c’ i.e., ATP
There are three energy systems to provide energy for muscular
activities.
Immediate energy system : Energy is provided by stored ATP and
creatine phosphate.
Anaerobic glycolytic system (lactic acid system) : Energy is
generated by utilization of glucose or glycogen by anaerobic
glycolysis. This energy is also generated early.
Aerobic or oxidative system : Energy is generated by utilization of
glucose/glycogen, and fatty acids through oxidative pathways, e.g.
TCA cycle.
These three energy systems operate as a continuum; each system
is always functioning, even at rest. o What varies is the relative
contribution each system makes to total ATP production at any given
time.
Substrates
Immediate
energy system
ATP, creatine
phosphate
An erobic
glycolytic system
Glucose or
glycogen
Oxidative (aerobic)
system
Glucose or
glycogen, fatty
acids
Energy production Very
fast Fast Slow
Peak at 0-30 sec. 20-180 sec. >3 min
Limiting
factor
Depletion of CrP,
ATP
Lactic acid as_.
vitiation Glycogen depletion
Activity
example
Powerlifting &
weight Longer sprints Endurance events
lifting, short
sprints
Middle distance
team sports Team sports
Jumping,
throwing
Ball games
(Soccer, rugby)
Ball games (Soccer,
field hockey)