For any paper or thesis, a hypothesis or problem statement needs to be made. The best ones are those that provide the following information:
The population doesn't need to be human. Most often this is a problem or process that needs to be changed in some way.
Current practice, opposing viewpoints, or conditions under which P & I occur
Measuring what worked best
Researchers in most fields are looking for one of two things:
The Why or the How then becomes the I element of the PICO formula.
The P element of the PICO formula is typically the Who or the What
This yielded 9 articles.
Conducting the same search in Sport Discus yielded 1 article.
Using PubMed and the same search yielded 6 articles.
Modifying the search in PubMed with the following terms and filters got better results: