I recently received an e-mail from a “Training Expert” on Oxygen debt and lactic acid build up as the reason for fatigue during speed endurance training.
Lactic acid accumulation in the muscles are known factors in speed endurance training fatigue. It’s true. However, when speed endurance training, independent of muscle fiber fatigue during fast and powerful activities, fatigue may occur first at the neural muscular junction, when there is a depletion of the chemical transmitter Ach, acetycholine , which stimulates “action potential” from the motor neurons to the muscle fiber types they innervate.
So coaches and athletes, on some training days or in competition, fatigue does not necessarily point to being an endurance issue due to poor cardio-vascular conditioning.
FYI:
Lactic acid levels return to their normal levels within one to two hours after training. The “old myth” that lactic acid is responsible for muscle soreness after a workout is just that, a myth. It is transient damage to muscle fibers and connective tissue, that creates muscle soreness. That is why rest and proper nutrition are as critical to improvement as is the training itself!
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