1 23 European Journal of Applied Physiology ISSN 1439-6319 Eur J Appl Physiol DOI 10.1007/s00421-012-2357-1 Energetics of running in top-level marathon runners from Kenya Enrico Tam, Huber Rossi, Christian Moia, Claudio Berardelli, Gabriele Rosa, Carlo Capelli & Guido Ferretti