By Randall L. Wilber, in BBC Sport
As elite athletes prepare for the 2012 London Olympics, many will be seeking to maximise their impact with training sessions at high altitudes.
A popular destination is the Great Rift Valley in Kenya, where athletes arrive from around the world, swelling the local population in peak season.
Altitude training has been used by endurance athletes for many years but there is growing evidence that the conventional wisdom should be challenged.
Training at altitude – where the oxygen level is considerably lower – allows athletes to increase their red blood cell count. This enables them to compete more effectively at sea level because more oxygen is delivered to the muscles.
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