نتایج جستجو برای: drop height

تعداد نتایج: 145537  

Journal: :British journal of sports medicine 2010
D A Harris I R Spears

OBJECTIVE The introduction of shoulder pads has coincided with a rise in shoulder impact injuries in the game of rugby. In this study, the effect of shoulder pads on impact force attenuation was quantified. DESIGN Four different commercially available shoulder pads were tested for material properties. Hard and soft objects were dropped from predetermined heights onto a force plate imparting p...

1998
E. D. Montalbano M. J. McCready

Laminar Newtonian flow through a 2-dimensional channel with one sinusoidal wall is studied for wavelengths comparable to, or much larger than, the channel height. In the long wave limit which is solved analytically, the pressure is in phase with the wave slope and the shear stress is in phase with the wave height. As the wavelength is reduced, the shear stress maximum moves upstream of the peak...

Journal: :Forensic science international 2013
N Kabaliuk M C Jermy K Morison T Stotesbury M C Taylor E Williams

Passive dripping, the slow dripping of blood under gravity, is responsible for some bloodstains found at crime scenes, particularly drip trails left by a person moving through the scene. Previous work by other authors has established relationships, under ideal conditions, between the size of the stain, the number of spines and satellite stains, the roughness of the surface, the size of the bloo...

Journal: :Acta of bioengineering and biomechanics 2010
Henryk Król Władysław Mynarski

In this study, we attempt to answer the following question: To what degree the higher muscular activity determined by increased load in the extension phase (eccentric muscle action) of vertical jump affects its efficiency? Ten high performance acrobats participated in this investigation. The acrobats performed tests that consisted of five single "maximal" standing vertical jumps (counter moveme...

Journal: :Journal of strength and conditioning research 2005
John B Cronin Keir T Hansen

For many sporting activities, initial speed rather than maximal speed would be considered of greater importance to successful performance. The purpose of this study was to identify the relationship between strength and power and measures of first-step quickness (5-m time), acceleration (10-m time), and maximal speed (30-m time). The maximal strength (3 repetition maximum [3RM]), power (30-kg ju...

Journal: :Journal of applied biomechanics 2006
Harald Böhm Gerald K Cole Gert-Peter Brüggemann Hanns Ruder

The contribution of muscle in-series compliance on maximum performance of the muscle tendon complex was investigated using a forward dynamic computer simulation. The model of the human body contains 8 Hill-type muscles of the lower extremities. Muscle activation is optimized as a function of time, so that maximum drop jump height is achieved by the model. It is shown that the muscle series elas...

Journal: :Journal of applied biomechanics 2010
Joshua T Weinhandl Mukta Joshi Kristian M O'Connor

The increased number of women participating in sports has led to a higher knee injury rate in women compared with men. Among these injuries, those occurring to the ACL are commonly observed during landing maneuvers. The purpose of this study was to determine gender differences in landing strategies during unilateral and bilateral landings. Sixteen male and 17 female recreational athletes were r...

2017
Peter Grunert Yu Moriguchi Brian P Grossbard Rodolfo J Ricart Arbona Lawrence J Bonassar Roger Härtl

BACKGROUND Discectomies are a common surgical treatment for disc herniations in the canine spine. However, the effect of these procedures on intervertebral disc tissue is not fully understood. The objective of this study was to assess degenerative changes of cervical spinal segments undergoing discectomy procedures, in vivo. RESULTS Discectomies led to a 60% drop in disc height and 24% drop i...

Journal: :Lab on a chip 2011
Céline Bottier Chiara Gabella Benoît Vianay Lara Buscemi Ivo F Sbalzarini Jean-Jacques Meister Alexander B Verkhovsky

We propose a new technique to measure the volume of adherent migrating cells. The method is based on a negative staining where a fluorescent, non-cell-permeant dye is added to the extracellular medium. The specimen is observed with a conventional fluorescence microscope in a chamber of uniform height. Given that the fluorescence signal depends on the thickness of the emitting layer, the objects...

2015
E. Kara A. C. Fabian A. M. Lohfink M. L. Parker D. J. Walton S. E. Boggs F. E. Christensen C. J. Hailey F. A. Harrison G. Matt C. S. Reynolds W. W. Zhang

The Narrow-line Seyfert I galaxy, 1H0707-495, has been well observed in the 0.3– 10 keV band, revealing a dramatic drop in flux in the iron Kα band, a strong soft excess, and short timescale reverberation lags associated with these spectral features. In this paper, we present the first results of a deep 250 ks NuSTAR observation of 1H0707-495, which includes the first sensitive observations abo...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید