Cycling economy following a 3-wk natural altitude training camp ( 2700) in nationally competitive cyclists - Martin, D. T.; Quod, M.; Garvican, L. A.; Etxebarria, N.; Stephens, B.; Impellizzeri, F. M.; Rampinini, E.; Sassi, A.; Gore, C. J. (Medicine & Science in Sports & Exercise, 2008)