Just moved this here as it seemed best place.
I get you. On that, using anabolics and HGH will allow one to recover better but that includes connective tissues so that stress fractures are less likely to happen. But as I mentioned before, stress fractures are not due to absolute volume but too quick a change in volume (including intensity). Under eating could also be a contributory factor in stress fractures. Using anabolics and EPO or synthetic O2 carriers allow athletes to train with more intensity and recover more quickly and absorb those adaptations. It would then make them faster in a race. For race day itself, if one’s haematocrit is artificially high, either by blood doping and or using EPO and or a synthetic O2 carrier then one will be faster.