“Increased cardiorespiratory fitness was independently associated with enhanced beta cell function. This study provides evidence that equal, if not more attention should be dedicated to cardiorespiratory fitness improvement relative to fat-loss for favourable pancreatic beta cell function and thus a possible reduction in cardiovascular risk in individuals with Metabolic Syndrome.”
Cardiorespiratory fitness is positively associated with increased pancreatic beta cell function independent of fatness in individuals with the metabolic syndrome: Fitness versus fatness.
Ramos JS, Dalleck LC2, Borrani F3, Fassett RG4, Coombes JS5 J Sci Med Sport. 2017.
This study shows that there is a correlation between aerobic fitness and enhanced beta cell function, but not between percentage body fat and beta cell function. So the conclusion from this paper is that clients who have a risk of Cardiovascular Disease may be better to concentrate on cardiovascular training rather than reducing % body fat.