Aerobic interval training versus continuous moderate exercise as a treatment for the metabolic syndrome: a pilot study - Tjonna, A E; Lee, S J; Rognmo, O; Stolen, T O; Bye, A; Haram, P M; Loennechen, J P; Al-Share, Q Y; Skogvoll, E; Slordahl, S A; Kemi, O J; Najjar, S M; Wisloff, U (Circulation, 2008)