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Nathan Millikan, Dustin R. Grooms, Brett Hoffman, and Janet E. Simon

runs, vertical jumps, hop tests, and balance tests. 5 – 11 This form of testing provides an indication of an athlete’s physical capability regarding rehabilitation progress or return to play readiness. However, isolated physical performance is only 1 aspect of function that must be restored after

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Jessica Ferreira, André Bebiano, Daniel Raro, João Martins, and Anabela G. Silva

are warranted. This study aims to compare the effects of neural sliding and neural tensioning immediately after the intervention and at 30-minute follow-up on (1) unipedal postural control of both the dominant and nondominant limbs and (2) hop testing of both the dominant and nondominant limbs of

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Laurie D. Booher, Karla M. Hench, Teddy W. Worrell, and Jill Stikeleather

Traditionally, lower extremity strength assessment has been performed in an open kinetic chain. Several authors, however, recommend closed kinetic chain assessment of lower extremity performance. Reliability of closed kinetic chain tests is not available. Therefore, the purpose of this study was to determine the reliability of the following single-leg hop tests: hop for distance, 6-m hop for time, and 30-m agility hop. Eighteen subjects (4 males and 14 females) participated in this study. An ANOVA repeated measures analysis revealed significant differences between the test trials within and between sessions for all dependent variables. However, when the mean of two test trials was analyzed, the three single-leg hop tests values were stable, that is, intraclass correlation coefficient (ICC 2,1) ranged from 0.77 to 0.99. Results demonstrate that these three single-leg hop tests were reliable as used in this study. Future research is needed to determine the sensitivity of these tests in the assessment of lower extremity performance following injury and following rehabilitation procedures.

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Dai Sugimoto, Benton E. Heyworth, Jeff J. Brodeur, Dennis E. Kramer, Mininder S. Kocher, and Lyle J. Micheli

. Such a comparison of dynamic balance and functional hop test performance based on graft types may enhance our understanding of the true functional deficits that may arise or persist in post-ACLR patients. Therefore, the purpose of this study was to investigate post-ACLR functional performance including

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Konstantinos Vassis, Savvas Spanos, Panagiotis Trigkas, Georgios Paras, and Ioannis Poulis

efficient dynamic knee stability during various activities, and are proposed for preparing the patient or the athlete to return to these activities. 16 , 17 Hop tests are the preferred and commonly used type of functional tests. 18 Until now, researchers have only examined the correlation between

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Hannah W. Tucker, Emily R. Tobin, and Matthew F. Moran

discriminative ability of forward, medial and rotational single-leg hop tests . Knee . 2019 ; 26 ( 5 ): 978 – 987 . PubMed ID: 31431339 doi:10.1016/j.knee.2019.06.010 31431339 10.1016/j.knee.2019.06.010 3. Forner-Cordero A , Mateu-Arce M , Forner-Cordero I , Alcántara E , Moreno JC , Pons JL

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Paige Guild, Monica R. Lininger, and Meghan Warren

injury mitigation interventions. Hopping for distance tests (single, triple, and crossover) or timed hopping tests is the most commonly utilized functional performance test in making return-to-sport decisions after ACL injury. 11 Differences between injured and uninjured limbs (ie, asymmetry) are also

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Luca Ruggiero, Susan Dewhurst, and Theodoros M. Bampouras

Leg stiffness is an important performance determinant in several sporting activities. This study evaluated the criterion-related validity and reliability of 2 field-based leg stiffness devices, Optojump Next® (Optojump) and Myotest Pro® (Myotest) in different testing approaches. Thirty-four males performed, on 2 separate sessions, 3 trials of 7 maximal hops, synchronously recorded from a force platform (FP), Optojump and Myotest. Validity (Pearson’s correlation coefficient, r; relative mean bias; 95% limits of agreement, 95%LoA) and reliability (coefficient of variation, CV; intraclass correlation coefficient, ICC; standard error of measurement, SEM) were calculated for first attempt, maximal attempt, and average across 3 trials. For all 3 methods, Optojump correlated highly to the FP (range r = .98–.99) with small bias (range 0.91–0.92, 95%LoA 0.86–0.98). Myotest demonstrated high correlation to FP (range r = .81–.86) with larger bias (range 1.92–1.93, 95%LoA 1.63–2.23). Optojump yielded a low CV (range 5.9% to 6.8%), high ICC (range 0.82–0.86), and SEM ranging 1.8–2.1 kN/m. Myotest had a larger CV (range 8.9% to 13.0%), moderate ICC (range 0.64–0.79), and SEM ranging from 6.3 to 8.9 kN/m. The findings present important information for these devices and support the use of a time-efficient single trial to assess leg stiffness in the field.

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Damien Murphy, Quinette A. Louw, Colum Moloney, Dominique Leibbrandt, and Amanda M. Clifford

procedure and clinical outcomes improve following rehabilitation, athletes often fail to achieve optimal functional recovery, 3 and up to 30% of reconstructed athletes sustain a second ACL rupture within 2 years of return to sport. 4 Single-leg hop tests are the gold standard for measuring functional

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Xiaoyue Hu, Jingxian Li, and Lin Wang

conduct of this study. Outcome Measures Square-hop test The square-hop test is a functional multidirectional test of the lower extremity ( Ros, Holm, Fridén, & Annette, 2013 ). In the square-hop test, the participants should stand with their hands behind their back. A 40 cm × 40 cm square with a 1-cm