Results 21 to 30 of about 5,387,813 (292)

Financial asset returns, direction-of-change forecasting, and volatility dynamics [PDF]

open access: yes, 2003
We consider three sets of phenomena that feature prominently - and separately - in the financial economics literature: conditional mean dependence (or lack thereof) in asset returns, dependence (and hence forecastability) in asset return signs, and ...
Christoffersen, Peter F.   +1 more
core   +2 more sources

The influence of age and sex on speed–strength performance in children between 10 and 14 years of age

open access: yesFrontiers in Physiology, 2023
Introduction: Speed-strength performance is important during human movements such as jumping, sprinting, and change of direction (COD) tasks, which are a substantial part of sports practice.
Konstantin Warneke   +6 more
doaj   +1 more source

Hydrodynamics and direction change of tumbling bacteria.

open access: yesPLoS ONE, 2021
The bacterium Escherichia coli (E. coli) swims in viscous fluids by rotating several helical flagellar filaments, which are gathered in a bundle behind the cell during 'runs' wherein the cell moves steadily forward.
Mariia Dvoriashyna, Eric Lauga
doaj   +1 more source

Agreement, Accuracy, and Reliability of a New Algorithm for the Detection of Change of Direction Angle Based on Integrating Inertial Data from Inertial Sensors

open access: yesAlgorithms, 2023
The development of algorithms applied to new technologies allows a better understanding of many of the movements in team sports. The purpose of this work was to analyze the validity, precision, and reproducibility of an algorithm to detect angulation of ...
Roberto Avilés   +3 more
doaj   +1 more source

Validity and Reliability of a Test Battery to Assess Change of Directions with Ball Dribbling in Para-footballers with Cerebral Palsy

open access: yesBrain Sciences, 2020
The purpose of this study was to evaluate the content and construct validity and between-sessions reliability of four agility tests requiring ball dribbling in football players with cerebral palsy (CP) with implications for classification and training. A
Lucas Felippe Daniel   +4 more
doaj   +1 more source

Determinants of Y-Shaped Agility Test in Basketball Players

open access: yesApplied Sciences, 2022
Y-shaped agility test is a reactive agility test that includes both sensory and motor components. However, there is a lack of information about the contribution of these components to reactive agility in basketball players.
Henrieta Horníková, Erika Zemková
doaj   +1 more source

The effect of high-intensity plyometric training on anaerobic performance parameters: a pilot study in U17 elite A league [PDF]

open access: yesPeerJ
The aim of this study was to examine the effects of high-intensity plyometric training (HIPT) on some parameters in elite soccer players in the U17. Volunteer soccer players were randomly divided into two groups according to their positions: the regular ...
Mehmet Söyler   +8 more
doaj   +2 more sources

Do maturation, anthropometrics and leg muscle qualities influence repeated change of direction performance in adolescent boys and girls?

open access: yesBiology of Sport, 2023
The ability to change direction rapidly is a key fitness quality especially in invasive sports where young players perform approximately 300 changes of direction in a game. There iscurrently limited understanding of how anthropometric characteristics and
Matteo Giuriato   +5 more
doaj   +1 more source

John Wheeler, relativity, and quantum information [PDF]

open access: yes, 2009
In spring 1952, as John Wheeler neared the end of design work for the first thermonuclear explosion, he plotted a radical change of research direction: from particles and atomic nuclei to general ...
Misner, Charles W.   +2 more
core   +1 more source

Are change of direction and small-sided game practises distinctive factors in regional amateur league football players?

open access: yesRevista Brasileira de Futsal e Futebol, 2023
The purpose of this study was to reveal whether change of direction and small-sided game practises are distinctive factors in regional amateur football players.
Mehmet Söyler, Raif Zileli
doaj  

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