Different Sagittal Angles and Moments of Lower Extremity Joints during Single-leg Jump Landing among Various Directions in Basketball and Volleyball Athletes.
Bottom Line: The data were analyzed with one-way repeated measures ANOVA. [Results] The results showed that knee joint flexion increased and hip joint flexion decreased at foot contact.In peak angle during landing, increasing ankle dorsiflexion and decreasing hip flexion were noted.Decreasing hip flexion during landing is associated with a stiff landing.
Affiliation: Faculty of Physical Therapy, Mahidol University.
[Purpose] The purpose of this study was to assess the sagittal angles and moments of lower extremity joints during single-leg jump landing in various directions. [Subjects] Eighteen male athletes participated in the study. [Methods] Participants were asked to perform single-leg jump-landing tests in four directions. Angles and net joint moments of lower extremity joints in the sagittal plane were investigated during jump-landing tests from a 30-cm-high platform with a Vicon™ motion system. The data were analyzed with one-way repeated measures ANOVA. [Results] The results showed that knee joint flexion increased and hip joint flexion decreased at foot contact. In peak angle during landing, increasing ankle dorsiflexion and decreasing hip flexion were noted. In addition, an increase in ankle plantarflexor moment occurred. [Conclusion] Adjusting the dorsiflexion angle and plantarflexor moment during landing might be the dominant strategy of athletes responding to different directions of jump landing. Decreasing hip flexion during landing is associated with a stiff landing. Sport clinicians and athletes should focus on increasing knee and hip flexion angles, a soft landing technique, in diagonal and lateral directions to reduce risk of injury.
No MeSH data available.
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Mentions: Participants were allowed to practice jump landing 3 to 5 times in each direction inorder to get accustomed the test. Participants were asked to perform the one-legjump-landing tests from a 30-cm-high platform in four directions; forward (0°), diagonalat 30°, diagonal at 60°, and lateral (90°) directions (Fig. 1). The platform was placed 70 cm from the center of the force plate. Theorder of testing was selected randomly. The participants were instructed to stand with thedominant leg on a wooden platform and flex the left knee approximately 90 degrees withneutral hip position. Both hands were placed on the waist in order to eliminatevariability in jumping mechanics due to arm swing. Each subject was instructed tocarefully jump off the wooden platform without an upward jump action. They were instructedto jump and land while always facing and looking forward during jump-landing tests. If thesubject was not able to maintain balance, land on the center of the force plate, maintainthe hands on the waist, or moved off the force plate, the trial was consideredunsuccessful. Unsuccessful trials were excluded and recollected. Three successful trialsin each direction of jump landing were analyzed. Participants were allowed to rest fiveminutes between directions and to rest at least thirty seconds between trials.
No MeSH data available.