Sportverletz Sportschaden 2022; 36(02): 92-99
DOI: 10.1055/a-1349-5605
Originalarbeit

Development of a modified cross-over hop test to reduce measurement errors in return-to-competition testing

Entwicklung eines modifizierten Cross-over Hop for Distance zur Reduzierung von Messfehlern
Christophe Lambert
1   Department of Trauma and Orthopedic Surgery, University of Witten/Herdecke, Universität Witten/Herdecke
,
Maxime Lambert
2   University of Witten/Herdecke, Universität Witten/Herdecke
,
Andree Ellermann
3   ARCUS Sports Hospital, ARCUS Sportklinik
,
Arasch Wafaisade
2   University of Witten/Herdecke, Universität Witten/Herdecke
,
Christian Buse
4   German Armed Forces, Bundeswehr
,
Nicholas Peters
5   University of Colorado Boulder
,
Christoph Centner
6   University of Freiburg im Breisgau, Albert-Ludwigs-Universität Freiburg
,
Erich Klinspon
7   RWTH University Aachen Centre of Process Engineering, Rheinisch-Westfälische Technische Hochschule Aachen, Aachener Verfahrenstechnik
› Author Affiliations

Abstract

Context Hop tests play an important role in the rehabilitation process after injuries. A comparison of the jumping distances of both extremities allows for an evaluation of the injured limb. In the conventional cross-over hop test for distance, the jump width (medial vs. lateral) that the athlete has to cross during the jump is not standardised and therefore highly variable. This affects the absolute jump length in each jump series.

Hypothesis Modifying the test may reduce the jump length variance between test series of an athlete as well as the test-dependent variations in the cross-over hop for distance.

Methods N = 47 athletes from the German and French national Judo youth teams were included in the study (age: 15.3 years ± 13–17). A modified version of the cross-over hop for distance was developed with a cross-over width of 50 cm and a fixed landing zone of 10 cm. The jump lengths of the conventional test and the modified test were documented. The change in jump length variations of the two sexes were compared.

Results The mean value of the coefficient of variation decreased significantly from 4.09 % to 2.83 % (p < 0.01) due to the test modification. This resulted in an absolute improvement in accuracy of 1.26 % and a relative improvement of 30.8 %. A comparison of the limb symmetry index between the conventional and the modified cross-over hop for distance revealed no significant differences.

Conclusion The modified cross-over hop for distance showed a significantly lower variation in jump lengths compared with the conventional cross-over hop for distance. As a result, more accurate statements can be made regarding the patient’s return-to-competition progress.

Zusammenfassung

Kontext Hop-Tests spielen eine wichtige Rolle im Rehabilitationsprozess nach Verletzungen. Der Vergleich der Sprunglänge beider Extremitäten erlaubt eine adäquate Funktionseinschätzung der verletzten Extremität. Beim konventionellen Cross-over Hop for Distance ist die Sprungbreite (medial vs. lateral), die der Sportler beim Sprung überkreuzen muss, variabel. Dadurch wird die absolute Sprunglänge in jeder Sprungserie beeinflusst.

Hypothese Durch Modifikation des Tests werden die Sprunglängenvarianz zwischen den Testserien eines Probanden und somit auch die testabhängigen Schwankungen beim Cross-over Hop for Distance verringert.

Methoden n = 47 Athleten der deutschen und französischen Judo-Jugendnationalmannschaften wurden untersucht (Alter: 15,3 Jahre ± 13–17 Jahre). Eine modifizierte Version des Cross-over Hop for Distance wurde entwickelt und eine standardisierte Sprungbreite (50 cm) und Landezone (10 cm) implementiert. Die Sprunglängen des konventionellen und des modifizierten Tests wurden dokumentiert. Die Veränderung der Sprunglängenvarianzen der beiden Geschlechter wurde verglichen.

Ergebnisse Der Mittelwert des Variationskoeffizienten konnte durch die Modifikation von 4,09 % auf 2,83 % (p < 0,01) signifikant gesenkt werden. Daraus ergibt sich eine absolute Verbesserung der Genauigkeit um 1,26 % und eine relative Verbesserung um 30,8 %. Ein Vergleich des Limb-Symmetry-Index zwischen dem Cross-over Hop for Distance und dem modifizierten Cross-over Hop for Distance zeigte keine signifikanten Unterschiede.

Schlussfolgerung Der modifizierte Cross-over Hop for Distance zeigte im Vergleich zum konventionellen Cross-over Hop for Distance eine signifikant geringere Variation zwischen den Sprunglängen einzelner Testserien. Dadurch können genauere Aussagen über die Fortschritte im Rehabilitationsprozesses des Athleten gemacht werden und eine sicherere Rückkehr in den Wettkampf und ein geringeres Risiko einer erneuten Verletzung für den Athleten erreicht werden.



Publication History

Article published online:
19 May 2021

© 2021. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 
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