Search Results

You are looking at 1 - 10 of 11 items for :

  • "biomechanical methods" x
  • Refine by Access: All Content x
Clear All
Restricted access

Loren Z.F. Chiu and George J. Salem

Sacral marker and pelvis reconstruction methods have been proposed to approximate total body center of mass during relatively low intensity gait and hopping tasks, but not during a maximum effort vertical jumping task. In this study, center of mass displacement was calculated using the pelvic kinematic method and compared with center of mass displacement using the ground-reaction force-impulse method, in experienced athletes (n = 13) performing restricted countermovement vertical jumps. Maximal vertical jumps were performed in a biomechanics laboratory, with data collected using an 8-camera motion analysis system and two force platforms. The pelvis center of mass was reconstructed from retro-reflective markers placed on the pelvis. Jump height was determined from the peak height of the pelvis center of mass minus the standing height. Strong linear relationships were observed between the pelvic kinematic and impulse methods (R 2 = .86; p < .01). The pelvic kinematic method underestimated jump height versus the impulse method, however, the difference was small (CV = 4.34%). This investigation demonstrates concurrent validity for the pelvic kinematic method to determine vertical jump height.

Restricted access

Emmanuel Jacobs, Nathalie Roussel, Ine Van Caekenberghe, Edith Cassiers, Luc Van den Dries, Jonas Rutgeerts, Jan Gielen, and Ann Hallemans

This cross-sectional study aimed at developing a biomechanical method to objectify voluntary and unpredictable movements, using an automated three-dimensional motion capture system and surface electromyography. Fourteen experienced theater performers were tested while executing the old man exercise, wherein they have to walk like an old man, building up a sustained high intensive muscular activity and tremor. Less experienced performed showed a different kinematics of movement, a slower speed of progression and more variable EMG signals at higher intensity. Female performers also differed from males in movement kinematics and muscular activity. The number of the trial only influenced the speed of progression. The performers showed results which could be well placed within the stages of learning and the degrees of freedom problem.

Restricted access

Kajetan J. Słomka, Slobodan Jaric, Grzegorz Sobota, Ryszard Litkowycz, Tomasz Skowronek, Marian Rzepko, and Grzegorz Juras

precisely “the sense of effort,” in psychophysical and motor control studies is typically defined as a judgment made by the subjects on the effort required to generate a certain level of force ( Enoka & Stuart, 1992 ). On the other hand, muscular effort can be estimated using different biomechanical methods

Restricted access

Dustin R. Grooms, Adam W. Kiefer, Michael A. Riley, Jonathan D. Ellis, Staci Thomas, Katie Kitchen, Christopher A. DiCesare, Scott Bonnette, Brooke Gadd, Kim D. Barber Foss, Weihong Yuan, Paula Silva, Ryan Galloway, Jed A. Diekfuss, James Leach, Kate Berz, and Gregory D. Myer

-specific VR assessments were taken prior to and immediately after the completion of the intervention. Although being fully instrumented for 3D motion analysis (see Hewett et al. 11 for more specifics on training and biomechanical methods), participants wore a custom-built, wireless, high-definition head

Open access

Samantha L. Winter, Sarah M. Forrest, Joanne Wallace, and John H. Challis

, eds. Techniques for Measuring Body Composition . Washington, DC : National Academy of Science ; 1961 : 223 – 244 . 19. Forrest SM . The validation of biomechanical methods for ageing and sex: force steadiness and body segment inertial parameters . [PhD Thesis]. Aberystwyth, United Kingdom

Restricted access

Daniel J. Brinkmann, Harald Koerger, Albert Gollhofer, and Dominic Gehring

stiffness could generate new knowledge in their ratio and could provide new insights into the impact on foot biomechanics. Methods Eighteen male athletes playing in the fourth to seventh German men’s amateur soccer league wearing shoe sizes UK 8.5 (n = 9, age: 24.1 [1.8] y, height: 1.79 [0.05] m, weight: 72

Restricted access

Kazumichi Ae, Dave Burke, Takashi Kawamura, and Sekiya Koike

during baseball tee batting motion at different hitting point heights . Jpn J Phys Educ, Health & Sport Sci . 2014 ; 59 ( 2 ): 431 – 452 . doi:10.5432/jjpehss.13067 10.5432/jjpehss.13067 29. Ae M , Muraki Y , Koyama H . A biomechanical method to establish a standard motion and identify

Restricted access

Jihong Park, Kyeongtak Song, and Sae Yong Lee

alterations, 12 , 26 we hypothesized that alterations in lower-extremity movements due to joint cooling would be related to risk factors for single-leg biomechanics. Methods Design This study employed a crossover design with a counterbalanced treatment order. The independent variables were conditions (ankle

Restricted access

Amy Waters, Elissa Phillips, Derek Panchuk, and Andrew Dawson

, 2014 ; Punch, 2014 ). Combining these two commonly used methods provides a more robust understanding of participants’ experiential knowledge of sprinting technique and biomechanics. Methods Survey Participants Fifty-six Australian sprint coaches and 12 International applied sport biomechanists took

Restricted access

Jane E. Clark, Farid Bardid, Nancy Getchell, Leah E. Robinson, Nadja Schott, and Jill Whitall

( Thelen, Fisher, & Ridley-Johnson, 1984 ). Impact Thelen and Fisher’s study represents a turning point in the study of motor development not only in infancy but also across the lifespan. Thelen and Fisher, like others before, used biomechanical methods to observe the infant’s motor behavior, but here they