Table 1.

Search terms and following keywords for screening procedures.

Search Term		Keywords
Football (population)	1	(“football” OR “soccer” OR “association football”)
Training load (dependent variable)	2	(“training load” OR “external training load” OR “workload” OR “internal training load” OR “external load” OR “internal load”)
Periodization (independent variables)	3	(“periodization” OR “schedule” OR “distribution” OR “week” OR “microcycle” OR “mesocycle” OR “season phase”) AND (“in-season” OR “pre-season” OR “preparation” OR “off-season” OR “post-season”)
Boolean search phrase (final search)	4	1 AND (2 OR 3)