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John R. Harry, Leland A. Barker, Jeffrey D. Eggleston, and Janet S. Dufek

Many competitive and recreational sports involve a propulsive vertical jump followed by a landing. An unavoidable occurrence during jump landings is impact with the ground. 1 Typically, the landing phase is evaluated with respect to injury potential due to high-magnitude vertical ground reaction

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Tomomasa Nakamura, Yuriko Yoshida, Hiroshi Churei, Junya Aizawa, Kenji Hirohata, Takehiro Ohmi, Shunsuke Ohji, Toshiyuki Takahashi, Mitsuhiro Enomoto, Toshiaki Ueno, and Kazuyoshi Yagishita

, the subsequent occlusion status (presence and force of teeth clenching) in various sports is also unknown. In this study, we investigated the occlusion status and the effect of teeth clenching on dynamic balance during jump-landing trials. The first question before beginning this study was that the

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Hayley M. Ericksen, Brian Pietrosimone, Phillip A. Gribble, and Abbey C. Thomas

participants performing a jump-landing task, then analyze the participants’ biomechanics. Feedback is then provided to individuals in an effort to change landing biomechanics and reduce injury risk. What can make expert-provided feedback challenging is that it can be difficult to implement with large groups of

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Tracey L. Clissold, Paul W. Winwood, John B. Cronin, and Mary Jane De Souza

program to slow and prevent loss of bone mass. 4 , 5 This emphasis on exercise, specifically jump-landings, provides the focus of this paper. Bilateral vertical jumps, including the countermovement (CMJ) and drop jump (DJ), have been shown to be valid and reliable tests for determining explosive leg

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A. Paige Lane, Sergio L. Molina, DaShae A. Tolleson, Stephen J. Langendorfer, Jacqueline D. Goodway, and David F. Stodden

stages characterized predominantly by take-off actions, but with brief reference to the management of center of gravity during flight and at landing. Major elements of their whole body stages are reflected in subsequently proposed standing long jump landing developmental sequences that used a component

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Hayley M. Ericksen, Caitlin Lefevre, Brittney A. Luc-Harkey, Abbey C. Thomas, Phillip A. Gribble, and Brian Pietrosimone

-extremity by the ground, when initially contacting the ground during a jump landing may be a biomechanical factor linked to ACL injury. 3 – 6 Increased vGRF may negatively affect the muscles ability to adequately attenuate forces around the knee, which may increase the potential for lower-extremity joint

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Jacob T. Hartzell, Kyle B. Kosik, Matthew C. Hoch, and Phillip A. Gribble

decreased sagittal plane knee motion during dynamic activities, such as jump landing. 10 – 12 More importantly, the link between DF ROM, quadriceps strength, and sagittal plane landing kinematics may provide a possible explanation for increased risk of acute knee injury in individuals with a previous

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Cornelius John, Andreas Stotz, Julian Gmachowski, Anna Lina Rahlf, Daniel Hamacher, Karsten Hollander, and Astrid Zech

, in the current study, we aimed to evaluate the efficacy of an elastic external ankle support on static balance, dynamic balance, and jump landing performance among young adults with CAI compared with healthy counterparts. We hypothesized that the elastic ankle support is effective in improving jump

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Kathy Liu and Gary D. Heise

Dynamic stability is often measured by time to stabilization (TTS), which is calculated from the dwindling fluctuations of ground reaction force (GRF) components over time. Common protocols of dynamic stability research have involved forward or vertical jumps, neglecting different jump-landing directions. Therefore, the purpose of the present investigation was to examine the influence of different jump-landing directions on TTS. Twenty healthy participants (9 male, 11 female; age = 28 ± 4 y; body mass = 73.3 ± 21.5 kg; body height = 173.4 ± 10.5 cm) completed the Multi-Directional Dynamic Stability Protocol hopping tasks from four different directions—forward, lateral, medial, and backward—landing single-legged onto the force plate. TTS was calculated for each component of the GRF (ap = anterior-posterior; ml = medial-lateral; v = vertical) and was based on a sequential averaging technique. All TTS measures showed a statistically significant main effect for jump-landing direction. TTSml showed significantly longer times for landings from the medial and lateral directions (medial: 4.10 ± 0.21 s, lateral: 4.24 ± 0.15 s, forward: 1.48 ± 0.59 s, backward: 1.42 ± 0.37 s), whereas TTSap showed significantly longer times for landings from the forward and backward directions (forward: 4.53 ± 0.17 s, backward: 4.34 0.35 s, medial: 1.18 ± 0.49 s, lateral: 1.11 ± 0.43 s). TTSv showed a significantly shorter time for the forward direction compared with all other landing directions (forward: 2.62 ± 0.31 s, backward: 2.82 ± 0.29 s, medial: 2.91 ± 0.31 s, lateral: 2.86 ± 0.32 s). Based on these results, multiple jump-landing directions should be considered when assessing dynamic stability.

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Dustin A. Bruening and James G. Richards

Lower extremity injuries in figure skating have long been linked to skating boot stiffness, and recent increases in jump practice time may be influencing the frequency and seriousness of these injuries. It is hypothesized that stiff boots compromise skaters' abilities to attenuate jump landing forces. Decreasing boot stiffness by adding an articulation at the ankle may reduce the rate and magnitude of landing forces. Prototype articulated figure skating boots were tested in this study to determine their effectiveness in enabling skaters to land with lower peak impact forces. Nine competitive figure skaters, who trained in standard boots and subsequently in articulated boots, performed off-ice jump simulations and on-ice axels, double toe loops, and double axels. Analysis of the off-ice simulations showed decreases in peak heel force and loading rate with use of the articulated boot, although the exact kinematic mechanisms responsible for these decreases are still unclear. Analysis of the on-ice jumps revealed few kinematic differences between boot types, implying that the skaters did not use the articulation. Greater adaptation and training time is likely needed for the results seen off-ice to transfer to difficult on-ice jumps.