The Anaerobic Energy Systems 7
High-intensity Exercise Research
· Bogdanis et al. (1995) 30 s sprint
PCr = 19.7 and ATP = 70.5% of the resting values,
muscle lactate was 11.9 mmol and muscle pH was
6.72.
· 1.5 minutes of recovery, PCr increased to 65% of
resting levels, but reached only 85% with 6 min
recovery.
· No change in ATP or glycogen after 6 min
· After 6 min of recovery peak W, speed and mean
power were all lower than the original sprint
Bogdanis et al.
Cont...
· Gaitanos and colleagues (1993) examined
the effects of 10 x 6 s maximal sprints on
muscle metabolism.
· Energy for 1st sprint from PCr degradation
and anaerobic glycolysis, reflected in a 57%
depletion of PCr, and a significant increase
in lactate concentration.
· After 10th sprint there was:
a decrease in mean power output by 23%,
no increase in lactate,
and a fall in PCr levels from 43% pre-bout to 16%
post sprint, accounting for 90% of ATP production.
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