TITLE

The Effects of Repetitive Drop Jumps on Impact Phase Joint Kinematics and Kinetics

AUTHOR(S)
Weinhandl, Joshua T.; Smith, Jeremy D.; Dugan, Eric L.
PUB. DATE
May 2011
SOURCE
Journal of Applied Biomechanics;May2011, Vol. 27 Issue 2, p108
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The purpose of the study was to investigate the effects of fatigue on lower extremity joint kinematics, and kinetics during repetitive drop jumps. Twelve recreationally active males (n = 6) and females (n = 6) (nine used for analysis) performed repetitive drop jumps until they could no longer reach 80% of their initial drop jump height. Kinematic and kinetic variables were assessed during the impact phase (100 ms) of all jumps. Fatigued landings were performed with increased knee extension, and ankle plantar flexion at initial contact, as well as increased ankle range of motion during the impact phase. Fatigue also resulted in increased peak ankle power absorption and increased energy absorption at the ankle. This was accompanied by an approximately equal reduction in energy absorption at the knee. While the knee extensors were the muscle group primarily responsible for absorbing the impact, individuals compensated for increased knee extension when fatigued by an increased use of the ankle plantar flexors to help absorb the forces during impact. Thus, as fatigue set in and individuals landed with more extended lower extremities, they adopted a landing strategy that shifted a greater burden to the ankle for absorbing the kinetic energy of the impact.
ACCESSION #
61794038

 

Related Articles

  • Comparison of Knee Mechanics Among Risky Athletic Motions for Noncontact Anterior Cruciate Ligament Injury. Hidenori Tanikawa; Hideo Matsumoto; Ikki Komiyama; Yoshimori Kiriyama; Yoshiaki Toyama; Takeo Nagur // Journal of Applied Biomechanics;Dec2013, Vol. 29 Issue 6, p749 

    It has been suggested that noncontact anterior cruciate ligament injury commonly occurs during sports requiring acute deceleration or landing motion and that female athletes are more likely to sustain the injury than male athletes. The purpose of this study was to make task-to-task and...

  • Biomechanics of Counterweighted One-Legged Cycling. Elmer, Steven J.; McDaniel, John; Martin, James C. // Journal of Applied Biomechanics;Feb2016, Vol. 32 Issue 1, p78 

    One-legged cycling has served as a valuable research tool and as a training and rehabilitation modality. Biomechanics of one-legged cycling are unnatural because the individual must actively lift the leg during flexion, which can be difficult to coordinate and cause premature fatigue. We...

  • Different Sagittal Angles and Moments of Lower Extremity Joints during Single-leg Jump Landing among Various Directions in Basketball and Volleyball Athletes. SINSURIN, KOMSAK; VACHALATHITI, ROONGTIWA; JALAYONDEJA, WATTANA; LIMROONGREUNGRAT, WEERAWAT // Journal of Physical Therapy Science;2013, Vol. 25 Issue 9, p1109 

    [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...

  • Kinematic and Kinetic Synergies of the Lower Extremities During the Pull in Olympic Weightlifting. Kipp, Kristof; Redden, Josh; Sabick, Michelle; Harris, Chad // Journal of Applied Biomechanics;Jul2012, Vol. 28 Issue 3, p271 

    The purpose of this study was to identify multijoint lower extremity kinematic and kinetic synergies in weightlifting and compare these synergies between joints and across different external loads. Subjects completed sets of the clean exercise at loads equal to 65, 75, and 85% of their estimated...

  • Kinematic Analysis of the Lower Extremities of Subjects with Flat Feet at Different Gait Speeds. MYOUNG-KWON KIM; YUN-SEOP LEE // Journal of Physical Therapy Science;May2013, Vol. 25 Issue 5, p531 

    The article discusses a study to determine the difference between flat feet and normal feet of humans at different gait velocities with the help of electromyography (EMG) and foot pressure analysis. It mentions that muscle activity data and foot pressure were collected and analyzed for the...

  • The Effects of a Lateral Wedge Insole on Knee and Ankle Joints During Slope Walking. Yuki Uto; Tetsuo Maeda; Ryoji Kiyama; Masayuki Kawada; Ken Tokunaga; Akihiko Ohwatashi; Kiyohiro Fukudome; Tadasu Ohshige; Yoichi Yoshimoto; Kazunori Yone // Journal of Applied Biomechanics;Dec2015, Vol. 31 Issue 6, p476 

    The purpose of this study was to determine whether a lateral wedge insole reduces the external knee adduction moment during slope walking. Twenty young, healthy subjects participated in this study. Subjects walked up and down a slope using 2 different insoles: a control flat insole and a 7°...

  • Medial Compressible Forefoot Sole Elements Reduce Ankle Inversion in Lateral SSC Jumps. Fleischmann, Jana; Mornieux, Guillaume; Gehring, Dominic; Gollhofer, Albert // Journal of Applied Biomechanics;Jun2013, Vol. 29 Issue 3, p346 

    Sideward movements are associated with high incidences of lateral ankle sprains. Special shoe constructions might be able to reduce these injuries during lateral movements. The purpose of this study was to investigate whether medial compressible forefoot sole elements can reduce ankle inversion...

  • Electromyographic preactivation pattern of the gluteus medius during weight-bearing functional tasks in women with and without anterior knee pain. Nakagawa, Theresa H.; Muniz, Thiago B.; Baldon, Rodrigo M.; Maciel, Carlos D.; Amorim, César F.; Serrão, Fábio V. // Brazilian Journal of Physical Therapy / Revista Brasileira de Fi;ene/feb2011, Vol. 15 Issue 1, p59 

    Background: Proximal factors have been proposed to influence the biomechanics of the patellofemoral joint. A delayed or diminished gluteus medius (GM) activation, before the foot contact on the ground during functional activities could lead to excessive femur adduction and internal rotation and...

  • Kinematic and Kinetic Analysis of the Fouetté Turn in Classical Ballet. Imura, Akiko; Iino, Yoichi; Kojima, Takeji // Journal of Applied Biomechanics;Nov2010, Vol. 26 Issue 4, p484 

    The fouetté turn in classical ballet dancing is a continuous turn with the whipping of the gesture leg and the arms and the bending and stretching of the supporting leg. The knowledge of the movement intensities of both legs for the turn would be favorable for the conditioning of the dancer's...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics