An impulse that goes to or comes from the brain to execute or inhibit a motor action travels through the nerve fibers at speeds ranging between 2.5 and 430 km / h. This maximum is reached by the myelin fibers that control skeletal muscle contraction; And it's the same for everyone from a super athlete to a recalcitrant sedentary person. Now, the type of fibers that make up the musculature at the individual level, that is, the proportion of fast and slow fibers of each muscle – a peculiarity that is genetically determined – together with regular training, notably optimize the response time in an exercise. However, there is an insurmountable response threshold. For example, sprinters spend at least 0.1 seconds from when they hear the shot until they react: the sound takes 0.04 seconds to reach the brain and the brain takes 0.01 seconds to generate a nerve impulse that travels through the spinal cord in 0.03 seconds. The muscles thus excited respond in 0.02 seconds.
How fast are the reflexes?
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