Fit-Fat Index is better associated with heart rate variability compared to fitness and fatness alone as indicators of cardiometabolic human health.
Ginés Navarro-LomasAbel Plaza-FloridoAlejandro De-la-OManuel J CastilloFrancisco José Amaro-GahetePublished in: American journal of human biology : the official journal of the Human Biology Council (2023)
was the best index in terms of its association to HRV.