TY - GEN A1 - Prill, Robert A1 - Michel, Sven A1 - Schulz, Robert A1 - Appell Coriolano, Hans-Joachim T1 - Body Composition and Strength Parameters in Elite Judo Athletes 5 Years after Anterior Cruciate Ligament Reconstruction T2 - International Journal of Sports Medicine N2 - The purpose of this study was to investigate if there are still deficits in muscle mass or strength capabilities in elite judo athletes with a history of anterior cruciate ligament reconstruction (ACLR) after their return to the sport. Therefore, bioimpedance analysis, 3D-laser thigh circumference measurement and isokinetic dynamometry in a closed kinetic chain were used. The side-to-side differences were investigated in a group of judo athletes 5 years after ACLR (n=17) and compared with a group of healthy judo athletes (n=27). Neither thigh circumferences, nor muscle masses of the lower extremities differed in formerly injured judo athletes compared to healthy judo athletes. In contrast, isokinetic strength testing showed a significantly larger side-to-side difference of peak muscle force in formerly injured judo athletes (p=0.021). They provided significantly lower peak forces with the formerly injured leg than with the non-injured leg (p<0.001). The authors conclude that strength capabilities, but not body composition, remains altered in recovered judo athletes in mean 5 years after ACLR and definitely after their return to sports. This indicates that the focus of rehabilitation protocols and return to sports assessments should focus more on maximum strength capabilities. KW - ACLR KW - back to competition KW - strength KW - body composition Y1 - 2019 U6 - https://doi.org/10.1055/a-0787-1420 SN - 1439-3964 SN - 0172-4622 VL - 40 IS - 1 SP - 38 EP - 42 ER - TY - CHAP A1 - Prill, Robert A1 - Michel, Sven A1 - Martin, Titus A1 - Braun, Alexander A1 - Kirschner, Jana T1 - The validity and reliability of a single-leg hop test to assess the postural control of Judokas 5 years after anterior cruciate ligament rupture T2 - Międzynarodowy Dzień Inwalidy, XXIV- Edycja, Życie bez bólu, Zdrowe Dzieci-Zdrowa Europa, Zgorzelec, 15-17 marca 2018 N2 - Anterior cruciate ligament rupture with subsequent reconstruction (ACLR) is a common and serious injury in Judo. Athletes rarely return to the peak of performance or are limited in their ability to perform their sport. Performance tests for ACLR are still immature and often unspecific. In Judo, the ability to stand on one's feet is an essential prerequisite for many situations. An unstable standing position also promotes knee injuries. In order to check the stability of the single leg stand, a controlled test-re-test design is used in the present study. Two groups are included: A (n=27): Judoka without anamnestically relevant injuries of the lower extremities or the back and B (n=17): Judoka 5.06 ± 1.06 years after ACLR. A one-legged hop test up on a piezoelectric force plate is examined for reliability with respect to the test repetition and validity with regard to the predicted identification of deficits in a side-by-side comparison. In this test, the test person jumps with one leg on the force plate at a defined distance and tries to stand as still as possible, which means that hardly any horizontal force is generated. Both tests are carried out one after the other with both legs and with sufficient break twice each. In group A, there were no significant differences (p>0.05) between the subjectively better leg and the subjectively worse leg, or the leg in the front and rear of the kumi-kata in Judo. In group B, in the first experiment with the ACLR leg, the test persons generate a significantly higher horizontal force in a 95% confidence interval of the bilateral coefficient of CI=[0.16-0.76] compared to the side not affected (p=0.017). In the test repetition, Group B generates with the affected leg significantly less horizontal force surges than in the first attempt. No significant differences in lateral comparison could be measured, although there is a reliability coefficient of r=0.89 for the ACLR leg, but only r=0.35 for the unaffected leg and r=0.53 for group A. It is concluded that the test for asymptomatic judokas cannot be regarded as sufficiently selective due to the low requirement. In group B, in the second experiment, a feed-forward model including pre-activation based on empirical values from the first experiment could explain the improvement, which has led to no significant differences between legs. KW - Validty KW - back to competition KW - knee KW - Anterior cruciate ligament Y1 - 2018 UR - http://mdi-online.net/MDI/images/Streszczenia_Abstracts_MDI_2018_WEB.pdf SN - 978-83-88380-76-1 SP - S. 81 PB - Obrzeża Oficyna Wydawnicza CY - Zgorzelec ER -