Table 1 The MEDLINE database search strategy

Population

1.Young Adult/ or Adult/

2. athlet*.mp.

3. 1 or 2

Intervention

4. nordic*.mp.

5. (Nordic adj3 exercise).mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

6. (Nordic adj3 device).mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

7. (Strength adj2 device).mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

8. (Eccentric adj3 device).mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

9. (Eccentric adj3 strength).mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

10. "Measurement device".mp.

11. Nordbord.mp.

12. "handheld dynamomet*".mp.

13. "digital dynamomet*".mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]

14. Lafayette.mp.

15. Myometer.mp.

16. ActivForce.mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]. 17. MicroFET2.mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]. 18. Biodex.mp.

19. Primus.mp.

20. Cybex.mp.

21. KinCom.mp.

22. Isokinetic device.mp.

23. 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20 or 21 or 22.

Outcome

24. Reliability.mp.

25. Agreement.mp.

26. Test-retest.mp

27. Repeated-measures.mp.

28. 24 or 25 or 26 or 27

29. 3 and 23 and 27

30. limit 28 to (English language and humans)