Yes—lots. Here are a few readings to get you started:

• The Tabata study.
• Lydiard A, Running To The Top, Meyers and Meyers Sport, 1995, pgs. 41, 78, & 105
• Maffetone P, Training for Endurance; Guide for Triathletes, Runners, & Cyclists David Barmore Productions, 1996, pg 78
• Burgomaster K, Hughes S, Heigenhauser G, Bradwell S, Gibala M. Six sessions of sprint interval training increases muscle oxidation potential and cycle endurance capacity in humans J Appl Physiol 98: 1985-1990, 2005
• Coyle, E. Very intense exercise-training is extremely potent and time efficient: a reminder J Appl Physiol 98: 1983-1984, 2005
• Guglielmo L G A, Greco C C, Denadai B S. Effects of strength training on running economy Internal Journal of Sports Medicine 30: 27-32, 2009
• Storen Oyvind, Helgurud Jan, Stoa Eva Maria, Hoff Jan. Maximal strength training improves running economy in distance runners Medicine & Science in Sports & Exercise, ACSM 40: 1087-1092, 2008
• Rae Dale E, et al. Skeletal muscle telomere length in healthy, experienced, endurance runners European Journal of Applied Physiology 109: 1439-6319, May 2010
• Schwartz J, et al. Does longterm endurance running enhance or inhibit coronary artery plaque formation? A prospective multidetector CTA study of men completing marathons for least 25 consecutive years Journal of American College of Cardiology: 2010, abstract 1271-330
• Runners Train Less and Be Faster: http://www.sciencedaily.com/releases/2009/11/091111122026.htm