Comparison of Single Modes of Exercise Training and Concurrent Training. (A) Simplified schematic diagram of phenotypic adaptive responses obtained from single modes of exercise training (endurance-based exercise training (ET) or resistance-based exercise training (RT)) with interrupted adaptive response in concurrent exercise training (CT) is presented. Interference in adaptive response between ET and RT was also indicated in CT although this is still controversial. (B) Hypothetical and speculative time course of adaptive responses in ET, RT and CT from an untrained state to a highly trained state. Interference in adaptive response becomes more evident as training periods are prolonged between single modes of exercise training (ET or RT) and concurrent exercise training (CT) (Adapted from (Coffey and Hawley, 2017)).