RE: Sprinters vs Long distance runners
The extreme nature of muscular recruitment and the activity needed to power sprinting is mildly anabolic, provided you are in a state of positive energy balance mind. You wont get this with less vigorous forms of cardio. It can stimulate muscular anabolism without overly influencing mTOR-mediated protein synthesis ( Naoki Kimura, Chiharu Tokunaga, Sushila Dalal, Christine Richardson, Ken-ichi Yoshino, Kenta Hara, Bruce E. Kemp, Lee A. Witters, Osamu Mimura and Kazuyoshi Yonezawa. A possible linkage between AMP-activated protein kinase (AMPK) and mammalian target of rapamycin (mTOR) signalling pathway. J. Biol. Chem. Volume 8, Issue 1 (January 2003) Page 65) And you don't get the same type of DOMS after effects that you can get from standard weight lifting, so it slots neatly into most normal weightlifting routines (given a 3 or 4 day split).