Sportdiscus

In accordance with MECIR standards, we will conduct a comprehensive literature search that includes large databases from the multi-disciplinary sciences and biomedical disciplines, specialist bibliographic databases to encompass the field of behavioural economics and databases with economic-specific evidence [36 ]. We will search the following databases from inception: MEDLINE (Ovid), Embase (Ovid), Cochrane Central Register of Controlled Trials (CENTRAL), the Cumulative Index to Nursing and Allied Health Literature (CINAHL) (EBSCO), Web of Science (Clarivate), Scopus (Elsevier), PsycINFO (Ovid), EconLit (EBSCO), SPORTDiscus (EBSCO) and National Health Service (NHS) Economic Evaluation Database. We will use a combination of free text and indexed terms combined with Boolean operators to search for relevant terms for the population, intervention and outcome components as defined above. We present the search strategy for MEDLINE (Ovid) in the Appendix. We will adapt this strategy for the remaining databases with the help of an academic librarian from the University of Melbourne. The strategy was developed based on terms used within other similar reviews and review protocols [16 (link), 41 ]. The search will be rerun prior to submission for publication and the results screened for potentially eligible new studies.

The electronic databases as follows will be searched from inception to present: CINAHL Complete (EBSCO), Cochrane Central Register of Controlled Trials (CENTRAL) (Wiley), MEDLINE (EBSCO), Scopus (Elsevier), SPORTDiscus (EBSCO), PEDro (The University of Sydney) and PubMed (US National Library of Medicine). Clinical trials will be sought via searches of ClinicalTrials.gov and UK Clinical Trials Gateway. Only English language publications will be sought, and no publication date limitations will be applied.
The search terms will be PCOS or polycystic ovary syndrome and terms relating to exercise or physical activity interventions. These will be adapted for use in other databases.
The PubMed search strategy can be found in the Appendix.

A systematic search of the relevant literature was performed (December 2022) in the electronic databases Web of Science, Scopus, Medline (via EBSCO), and SPORTDiscus (via EBSCO) to identify articles published with no time restrictions. One of the authors (MS) conducted the initial search using keywords with Boolean operators “AND” and “OR” with various combinations in the title and/or abstract and/or full texts. The search requests were as follows: (“focus of attention” OR “attentional focus” OR “attentional foci” OR “external focus” OR “internal focus” OR “external foci” OR “internal foci” OR “attentional strateg*”) AND (“tennis” OR “table tennis” OR “badminton” OR “squash” OR “padel”). We combined the search results and removed duplicates automatically using the management software EndNote X7 (Thomson Reuters, Philadelphia, PA, USA). All grey literature (e.g., conference abstracts, and unpublished data) were excluded from the final analysis. The flow chart of the systematic search process is summarized in Fig 1.