What specific physiological adaptations occur during zone 4 training that contribute to improvements in anaerobic threshold, and how do these changes enable cyclists to sustain higher intensities for longer periods of time without accumulating excessive fatigue.
Is it the increased mitochondrial density, enhanced buffering capacity, or improved lactate clearance that plays the most significant role in this process, and what is the optimal duration and frequency of zone 4 training to induce these adaptations.
Can zone 4 training be effectively combined with other training zones to maximize anaerobic threshold gains, or is it more beneficial to focus on this specific zone exclusively during certain periods of the training cycle.
Is it the increased mitochondrial density, enhanced buffering capacity, or improved lactate clearance that plays the most significant role in this process, and what is the optimal duration and frequency of zone 4 training to induce these adaptations.
Can zone 4 training be effectively combined with other training zones to maximize anaerobic threshold gains, or is it more beneficial to focus on this specific zone exclusively during certain periods of the training cycle.