Sir, we will write this article but I would notice that "Performance enhancement " ,from my standpoint , can be discussed in a ''performance event" time barriers only... we can talk about recovery between sets, strength during this current performance(set,rep), work capacity of this current workout.
So we can speak about specific adaptation and special training.
...the most useful advice in sports I ever had, like a Zen Buddhist Koans its so wise that you will rediscover its hidden meaning every time you will think about it... is : "If you want to jump higher you should jump more as high as you can."
Performance enhancement means improving upon the way you currently perform. It doesn't necessarily mean that you are doing something wrong or performing inappropriately. It means that you'd like to increase your knowledge, mood, emotional side, motivation and skills to improve what you currently do. For example, you are really good at recognizing your pre-performance anxiety and have found that taking three deep breaths upon that recognition helps decrease your anxiety level. Performance enhancement helps enhance that level of knowledge and understanding.
Weightlifters, for example, have a detailed picture of the movement in their head before performing , feel calm and confident, after long training and analysis of technique with a trainer, of course. Some athletes have problems with performing at competitions - they show excellent results in training, but absolutely burn out during important events.
So probably I didn't get your question right, you can specify, and it would be interesting to know about your research also, sir