An American research team tested if short-term, work-matched continuous (CONT) versus interval (INT) exercise training improves glucose tolerance in part by reducing insulin resistance and increasing metabolic flexibility independent of clinically meaningful fat loss in adults with prediabetes. They found that CONT and INT training improved VO2peak and glucose tolerance and reduced fasting respiratory exchange ratio (RER), as well as whole-body and adipose insulin resistance with no effect on body fat.
Med Sci Sports Exerc. 2018 May 14. doi: 10.1249/MSS.0000000000001667