Scientific journals most commonly publish research articles and review articles. Research articles are written by and for scholars in order to share their research findings. Review articles compile the results of many different studies on a topic into an overview of that field. Most scientific journals go thru the process of peer-review in which they send the drafts of articles submitted to them to a group of scholars in the discipline prior to publication.
Swimming by Airman Magazine
Remember these search tips when using databases
Quotation marks = search for phrases (two or more words): "supplementary aids"
Wildcard* = search for variations of the term: nutri* will give you results for nutrition, nutritian, nutrients, nutritional
OR = more. Combine synonyms or similar terms to increase the number of results: (vegetarian diet) OR (plant based diet)
AND = narrow your results. Combine different concepts to narrow your search: (young athletes) AND (nutri*)
NOT = excludes terms from your search: (adult athletes) NOT (young adult athletes)