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Aerobic high-intensity intervals improve VO2max more than moderate training.
Helgerud J, Høydal K, Wang E, Karlsen T, Berg P, Bjerkaas M, Simonsen T, Helgesen C, Hjorth N, Bach R, Hoff J. Helgerud J, et al. Among authors: bjerkaas m. Med Sci Sports Exerc. 2007 Apr;39(4):665-71. doi: 10.1249/mss.0b013e3180304570. Med Sci Sports Exerc. 2007. PMID: 17414804 Clinical Trial.