Table 1 Database search strategy

Overtraining

overtrained OR overtraining OR overtrain* OR staleness OR "performance plateau" OR "overtraining syndrome" OR "over reaching" OR "poor recovery" OR "under recovery" OR "over train" OR "over-train" OR "over trained" OR "over-trained" OR "over training syndrome" OR "over-training syndrome"

Cognitive function

“cognitive function" OR cognition OR perception OR memory OR learning OR "decision making" OR "mental abilities" OR "brain function*" OR "working memory" OR memory OR "cognitive flexibility OR "mental operations" OR academic OR "academic success" OR thought OR "though processes" OR intellect* OR conscious* OR "psychological function" OR judgement OR attention OR *conscious* OR mind OR recollection OR remembrance

Endurance athlete

athlete* OR "sports person*" OR "sports people" OR sportsperson OR sportspeople OR sportsm?n OR sportswom?n OR "sports m?n" OR "sports wom?n" OR run* OR swim* or sail* OR triathlon OR triathlete OR row* OR "cross country skiing" OR "physical training" OR "physical activity" OR "endurance training" OR "endurance sport*" OR "endurance athlete*" OR "open water swim*" OR "water polo" OR "ultra marathon" OR football OR soccer OR "endurance training" OR marathon OR “badminton player*” OR baseballer* OR “baseball player*” OR basketballer* OR “basketball player* OR bastm?n OR bobsledder* OR *boxer* OR canoeist* OR cricketer* OR *cyclist* OR “hockey player*” OR kayaker* OR “lacrosse player*” OR *marathoner* OR netballer* OR “netball player*” OR racewalker* OR “race walker*” OR softballer* OR “softball player*” OR “tennis player*” OR volleyballer* OR “volleyball player*” OR aerobic OR "aerobic type" OR "endurance type" OR "aerobic athlete*" OR "aerobic sport" OR sport OR sporting OR exercise