Notes on the onset of blood lactate accumulation (OBLA) for A2 Physical Education, Exercise Physiology module.

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  • Created by: Anonymous
  • Created on: 10-01-08 13:01
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There is a certain point where the aerobic system cannot supply the
energy quickly enough and out body has to switch to anaerobic processes.
Taking a blood sample and measuring the concentration of lactic acid can
readily measure this point. A normal value during rest or aerobic exercise would
be anywhere between 12 mmol of lactic acid per litre of blood. Once this value
goes about 4 mmol or the point where there is a rapid increase in this value, the
Onset of Blood Lactate Accumulation has been reached. This point will vary
depending on the aerobic fitness of the performer. If untrained individuals, this
may occur at about 50 percent of their VO2 max, whereas highly trained
individuals, this may occur at about 85 percent of the VO2 max. This is due to
their increased ability to remove waste products and supply oxygen to working
The onset of blood lactate accumulation is a point during progressive exercise when
the blood lactate concentration suddenly increases.


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