This one just keeps hanging on. Even many running experts continue to believe that lactic acid is a fatigue inducing waste product. Nearly every running event I watch on TV has a running commentator telling us how lactic acid build up is causing the runners to go into “oxygen debt” and slow down. Nothing could be further from the truth. Lactic acid is not a waste product. It’s a valuable compound, produced at all times, that is used to produce energy to fuel your running. It doesn’t cause fatigue – recent research has even suggested that lactic acid acts to prevent fatigue caused by a reduction in cellular potassium.
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