17. Cardoso de Araujo M, Baumgart C, Jansen CT, Freiwald J, Hoppe MW: Sex differences in physical capacities of German Bundesliga soccer players. J Strength Cond Res 2018

18. Carling C, Bloomfield J, Nelsen L, Reilly T: The role of motion analysis in elite soccer: contemporary performance measurement techniques and work rate data. Sports Med 2008; 38: 839–62

19. Carling C, Reilly T, Williams AM: Performance assessment for field sports. 1. Aufl., New York: Routledge, 2009

20. David S, Komnik I, Peters M, Funken J, Potthast W: Identification and risk estimation of movement strategies during cutting maneuvers. J Sci Med Sport 2017; 20: 1075–80

21. De Ste Croix MB, Priestley AM, Lloyd RS, Oliver JL: ACL injury risk in elite female youth soccer: changes in neuromuscular control of the knee following soccer-specific fatigue. Scand J Med Sci Sports 2015; 25: 531–8

22. di Prampero PE: GPEXE – The power tracker. www.gpexe.comteam/: 29.10.2017

23. Di Salvo V, Gregson W, Atkinson G, Tordoff P, Drust B: Analysis of high intensity activity in Premier League soccer. Int J Sports Med 2009; 30: 205–12

24. FIdF A: Approval of electronic performance and tracking system (EPTS) devices. Zurich: Federation Internationale de Football Association, 2015

25. Freiwald J, Baumgart C, Hoppe M, Jansen C, Cardoso M, Schneider U: Ressourcenmodell, Leistungsdiagnostik und Training der konditionellen Fähigkeiten im Frauen- und Männerfußball. SportOrthoTrauma 2011; 27: 27–34

26. Freiwald J, Baumgart C, Hoppe MW et al.: Return to Sport nach Verletzungen im Hochleistungsfußball – was ist dazu notwendig? Sport Orthop. Traumatol. 2013; 29: 4–12

27. Freiwald J, Brexendorf B, Pieper S, Baumgart C, Slomka M, Papadopoulos C: Leistungs- und Funktionsdiagnostik im Hochleistungsfußball – Präventives Screeningverfahren für Über- und Fehlbelastungen sowie Übertraining. SportOrthoTrauma 2008; 24: 20–30

28. Gabbett TJ: The training-injury prevention paradox: should athletes be training smarter and harder? Br J Sports Med 2016; 50: 273–80

29. Gaudino P, Alberti G, Iaia FM: Estimated metabolic and mechanical demands during different small-sided games in elite soccer players. Hum Mov Sci 2014; 36: 123–33

30. Gokeler A, Dingenen B, Mouton C, Seil R: Clinical course and recommendations for patients after anterior cruciate ligament injury and subsequent reconstruction: a narrative review. EFORT Open Rev 2017; 2: 410–20

31. Gregson W, Drust B, Atkinson G, Salvo VD: Match-to-match variability of high-speed activities in premier league soccer. Int J Sports Med 2010; 31: 237–42

32. Halson SL: Monitoring training load to understand fatigue in athletes. Sports Med 2014; 44: 139–47

33. Hoff J, Helgerud J: Endurance and strength training for soccer players: physiological considerations. Sports Med 2004; 34: 165–80

34. Hoff J, Wisloff U, Engen LC, Kemi OJ, Helgerud J: Soccer specific aerobic endurance training. Br J Sports Med 2002; 36: 218–21

35. Hoppe MW, Baumgart C, Freiwald J: Do running activities of adolescent and adult tennis players differ during play? Int J Sports Physiol Perform 2016; 11: 793–801

36. Hoppe MW, Baumgart C, Freiwald J: Estimating external loads and internal demands by positioning systems and innovative data processing approaches during intermittent running activities in team and racquet sports. Sport Orthop. Traumatol. 2018; 34: 3–14

37. Hoppe MW, Baumgart C, Polglaze T, Freiwald J: Validity and reliability of GPS and LPS for measuring distances covered and sprint mechanical properties in team sports. PLoS One 2018; 13: e0192708

38. Hoppe MW, Baumgart C, Slomka M, Polglaze T, Freiwald J: Variability of metabolic power data in elite soccer players during pre-season matches. J Hum Kinet 2017; 58: 233–45

39. Hoppe MW, Baumgart C, Sperlich B et al.: Comparison between three different endurance tests in professional soccer players. J Strength Cond Res 2013; 27: 31–7

40. Hoppe MW, Freiwald J, Baumgart C, Born DP, Reed JL, Sperlich B: Relationship between core strength and key variables of performance in elite rink hockey players. J Sports Med Phys Fitness 2015; 55: 150–7

41. Hoppe MW, Slomka M, Baumgart C, Weber H, Freiwald J: Match running performance and success across a season in German Bundesliga soccer teams. Int J Sports Med 2015; 36: 563–6

42. Krustrup P, Bradley PS, Christensen JF et al.: The yo-yo IE2 test: physiological response for untrained men versus trained soccer players. Med Sci Sports Exerc 2015; 47: 100–8

43. Krustrup P, Mohr M, Amstrup T et al.: The yo-yo intermittent recovery test: physiological response, reliability, and validity. Med Sci Sports Exerc 2003; 35: 697–705

44. Leger LA, Lambert J: A maximal multistage 20-m shuttle run test to predict VO2 max. Eur J Appl Physiol Occup Physiol 1982; 49: 1–12

45. Lemmink KA, Visscher C: The relationship between the interval shuttle run test and maximal oxygen uptake in soccer players. J Hum Mov Stud 2003; 45: 219–32

46. Linke D, Link D, Lames M: Validation of electronic performance and tracking systems EPTS under field conditions. PLoS One 2018; 13: e0199519

47. Maud PJ, Foster C: Physiological assessment of human fitness. 2. Aufl., Champaign: Human Kinetics, 2006