Energy System Development.

I am not clear as to what you are asking.

Are you asking if a person can train a certain way to develop energy systems?

By cyclic Energy System Development I assume you mean an interval that follows a complex (repeating or changing) pattern of movements to develop the anaerobic or aerobic energy systems. If this is what you are saying then I prefer the cyclic training because it allows you to incorporate more movements, giving you more recovery from each seperate movement. With cycles you can maintain strong form with each rep, get better hormonal response from training more muscle groups, and get your heart rate going more than steady state training or alternating intervals. That being said the aerobic energy system responds well to steady state training so if I'm training someone for a marathon or a primarily aerobic activity I won't use intervals as often.

ESD can be done using any mode of cardio/circuit training. It is based off of Levels (heart zone).

Here's a link on ESD by the creator Mark Verstegen.

http://www.coreperformance.com/knowledge/training/energy-system-developm...