Midgley et al 2006 performed a review of the literature analyzing various proposed methods for increasing the maximal oxygen uptake, VdotO(2max) in trained distance runners who had exhausted conventional adaptation. Numerous programs were found that extolled the benefits of training at 40-50%, 60-70%, above 80% and above 95% of VdotO(2max). However, upon completing the review, results indicate that the best type of training for elite runners would include a significant portion of training at 95-100% of VdotO(2max). This supports the idea that high intensity training is one of the few methods those who are already well adapted to a method can continue to adapt to it. This reinforces the message that if you are already well adapted to a method of training, manipulating intensity and rest variables will continue to get you results.