|Run first, lift second to end your workouts on an anabolic tune.|
A reduction / reduced increase of testosterone and or IGF, of which Rosa et al. state that they are the "most important anabolic hormonal indicators associated with muscle hypertrophy" would be one of the many potential reasons for said interference.
Accordingly, the aim of the Portuguese scientists was to investigate and compare the hormonal responses (testosterone, cortisol, growth hormone, and IGFBP-3) to different intra-session endurance and strength training order in concurrently trained men.
|Figure 1: Anaerobic and aerobic performance markers of the study participants (Rosa. 2014).|
The protocol of the strength training sessions was designed in order to consider an appropriate and efficient manipulation of several training variables which have been associated in the literature with higher energy expenditure during and after the exercise(s), namely: multiple sets; exercises recruiting large-muscle mass; movement speed; number of repetitions ; the intensity and volume of the workload; resting time between sets ; and the execution order of the resistance exercises. If you feel hypo after the workouts, that's the way to go... well, at least if you want to maximize your growth hormone production. Hypoglycemia, which is characterized by low blood sugar levels, is after all a potent stimulus to secretion of growth hormone (Roth. 1963). Needless to say that your blood glucose levels will be lower if you do cardio first, if this is going to be more anabolic is a whole different question, though.