Abstract
ObjectivesTo determine the inter-rater and intra-rater reliability of frontal and sagittal plane landing kinematic measures during drop jump (DVJ) and tuck jump (TJA) tasks in male youth soccer players, to assess the concurrent validity between DVJ and TJA tests, and to evaluate the ability of both tasks to detect differences between players’ stage of maturation. DesignCross-sectional study. Participants223 male youth soccer players. Main outcome measuresFrontal plane knee projection angles (FPPA), and hip (HF), knee (KF) and ankle (AF) flexion angles at initial contact (IC) and peak flexion (PF) (i.e., the deepest landing position) in the sagittal plane were assessed. ResultsGood-to-excellent inter- and intra-rater reliability (ICC > 0.75; TEMST < 0.3; CVTE < 5%) for the FPPA, HF and KF during DVJ and TJA tasks were found. A low concurrent validity between DVJ and TJA measures was reported. Differences by maturity status (BF10 > 10; error < 10; δ > 0.6) were only identified for the TJA. Pre-PHV group reported higher FPPA, HF-IC, HF-PF, and KF-IC values, as well as lower AF-IC than post-PHV. Pre-PHV also displayed greater HF-IC and KF-IC than circa-PHV group. ConclusionsAlthough both tests are reliable, the TJA might be viewed as a more informative tool given it shows greater FPPA and can also detect differences by maturity status.
Highlights
Young team sport players are at risk of knee and ankle injuries (Jones et al, 2019; Owoeye et al, 2020)
The main findings of this study revealed that the 2D landing video analysis was a reliable tool for assessing the knee frontal plane projection angle (FPPA) as well as the HF and KF angles during Drop vertical jump (DVJ) and tuck jump assessment (TJA) tasks by experienced single or different testers
Both tests have been used to examine landing technique previously, the results of this research showed a low relationship between DVJ and TJA kinematic measures, demonstrating significant higher FPPA and lower HF-peak flexion (PF) and KF-PF values during the TJA test
Summary
Young team sport players are at risk of knee and ankle injuries (Jones et al, 2019; Owoeye et al, 2020). It has been suggested that the appearance of dynamic knee valgus might be influenced by deficits in sagittal plane motions (Dingenen et al, 2015; Pollard et al, 2010). Knee and ankle flexion patterns may contribute to knee valgus as a compensatory strategy that modulates the greater ground reaction forces derived from a stiffer landing posture
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