WIe stehst Du denn zu diesen Erklärungen. Verständlich?
"According to Dr. Iñigo San Millán, Ph.D., Director of the Exercise Physiology and Human Performance Lab at the University Of Colorado School Of Medicine,
the purpose of Zone 2 endurance training is to improve lactate clearance “by increasing the number of mitochondria to clear lactate mainly in slow twitch muscle fibers as well as by increasing the number of MCT-1 and mLDH [lactate-specific transporters which transport lactate away from muscle fibers].”
The key point is that lactate is cleared mainly by
slow twitch muscle fibers, not
fast twitch muscle fibers. So, training at a high intensity will not exactly improve your aerobic threshold or your body’s ability to clear lactate because high-intensity exercise targets fast twitch muscle fibers. Instead, you need to train your slow twitch muscle fibers at low intensities (i.e., Zone 2) in order to improve your aerobic threshold."