Results 41 to 50 of about 6,027,929 (265)

Optimal Reactive Strength Index

, 2018
This study aimed to compare the effects of drop-jump training using a fixed drop-box height (i.e., 30-cm [FIXED]) vs. an optimal (OPT) drop-box height (i.e., 10-cm to 40-cm: generating an OPT reactive strength index [RSI]) in youth soccer players' physical fitness.
Ramirez-Campillo, Rodrigo (PhD), Alvarez, Cristian, Garcia-Pinillos, Felipe, Sanchez-Sanchez, Javier, Yanci, Javier, Castillo, Daniel, Loturco, Irineu, Chaabene, Helmi (Prof. Dr.), Moran, Jason (PhD), Izquierdo, Mikel (Dr.)   +9 more
openaire   +3 more sources

Relationships between reactive agility movement time and unilateral vertical, horizontal, and lateral jumps [PDF]

, 2016
Henry, GJ, Dawson, B, Lay, BS, and Young, WB. Relationships between reactive agility movement time and unilateral vertical, horizontal, and lateral jumps. J Strength Cond Res 30(9): 2514-2521, 2016 - This study compared reactive agility movement time and
Brian Dawson, Young, Warren, Greg J. Henry, Brendan S. Lay, Dawson, Brian, Warren B. Young, Lay, Brendan, Henry, Greg   +7 more
core   +1 more source

Biomechanical Determinants of the Reactive Strength Index During Drop Jumps

International Journal of Sports Physiology and Performance, 2018
The Reactive Strength Index (RSI) is often used to quantify drop-jump (DJ) performance; however, not much is known about its biomechanical determinants. The purpose of this study was to investigate the correlations between the RSI and several biomechanical variables calculated from DJ performed with different initial drop heights.
Kipp, Kristof, Kiely, Michael T., Giordanelli, Matthew D., Malloy, Philip, Geiser, Christopher   +4 more
openaire   +3 more sources

The validity and reliability of the my jump 2 app for measuring the reactive strength index and drop jump performance. [PDF]

, 2019
BACKGROUND: This is the first study to independently assess the concurrent validity and reliability of the My Jump 2 app for measuring drop jump performance. It is also the first to evaluate the app's ability to measure the reactive strength index (RSI).
Brazier, Jon, Antrobus, M, Bishop, Chris, Bishop, C, Haynes, T, Haynes, Tom, Haynes, Thomas, Antrobus, Mark   +7 more
core   +1 more source

Validity and reliability of the Output sport device for assessing drop jump performance

Frontiers in Bioengineering and Biotechnology, 2022
The devices for measuring plyometric exercise in field conditions are becoming increasingly prevalent in applied research and practice. However, before the use of a device in an applied setting, the validity and reliability of such an instrument must be ...
Raynier Montoro-Bombú, Adam Field, Amândio Cúpido Santos, Luis Rama, Luis Rama   +4 more
doaj   +1 more source

Body mass index, muscle strength and physical performance in older adults from eight cohort studies: the HALCyon programme. [PDF]

, 2013
Objective To investigate the associations of body mass index (BMI) and grip strength with objective measures of physical performance (chair rise time, walking speed and balance) including an assessment of sex differences and non-linearity.
Hardy, R, John M. Starr (107707), McNeill Geraldine, Cooper, R, Kuh Diana, Rachel Cooper, Gallacher, John, Holly Syddall, Geraldine McNeill, Starr, John M., John Gallacher, Starr, John M, Yoav Ben-Shlomo, Aihie Sayer, Avan, McNeill, G, Ben-Shlomo, Y, Cyrus Cooper (141250), Panayotes Demakakos (196562), John Gallacher (196569), Martin, Richard M, Syddall Holly, Cyrus Cooper, Cooper Cyrus, Martin, RM, Hardy, Rebecca, Steptoe Andrew, McNeill, Geraldine, Demakakos, Panayotes, Demakakos Panayotes, Starr, JM, Syddall, H, Steptoe, A, ?, ?, John M Starr, HALCyon study team, Avan Aihie Sayer, Geraldine McNeill (107695), Cooper, Rachel, Deary, IJ, Ben-Shlomo, Yoav, Ian J. Deary (107724), Cooper Rachel, Avan Aihie Sayer (188916), Rebecca Hardy, Hardy Rebecca, Deary, Ian J., Martin, Richard M., Ian J Deary, Cooper, Cyrus, Holly Syddall (231862), Syddall, Holly, Richard M. Martin (176602), Sayer, Avan Aihie, Kuh, Diana, Rebecca Hardy (188906), Gallacher, J, Deary, Ian J, Panayotes Demakakos, Martin Richard M., Demakakos, P, Richard M Martin, Yoav Ben-Shlomo (95286), Andrew Steptoe, Diana Kuh, Gallacher John, Kuh, D, Starr John M., Andrew Steptoe (36331), Deary Ian J., Aihie Sayer, A, Cooper, C, Aihie Sayer Avan, Steptoe, Andrew, Ben-Shlomo Yoav, Diana Kuh (188923), Rachel Cooper (188902)   +75 more
core   +1 more source

Influence of the Reactive Strength Index Modified on Force– and Power–Time Curves

International Journal of Sports Physiology and Performance, 2018
The Reactive Strength Index Modified (RSImod) has been recently identified and validated as a method of monitoring countermovement-jump (CMJ) performance. The kinetic and kinematic mechanisms that optimize a higher RSImod score are, however, currently unknown.
McMahon, JJ, Jones, PA, Suchomel, TJ, Lake, J, Comfort, P   +4 more
openaire   +3 more sources

Discussion: Remoulded shear strength at plastic and semi-solid states [PDF]

, 2013
The undrained shear strength of remoulded soils is of great concern in geotechnical engineering applications. This study aims to develop a reliable approach for determining the undrained shear strength of remoulded fine-grained soils, through the use of ...
Vardanega, Paul Joseph, Sridharan, A, Haigh, Stuart, Vinod, P., Haigh, S, Deepa, K. A., Deepa, KA, ,, Vardanega, PJ, Vinod, P, Sridharan, A.   +10 more
core   +1 more source

A Brief Review of Selected Biomechanical Variables for Sport Performance Monitoring and Training Optimization

Applied Mechanics, 2022
Traditional neuromuscular tests (e.g., jumping and sprinting tasks) are useful to assess athletic performance, but the basic outcomes (e.g., jump height, sprint time) offer only a limited amount of information, warranting a more detailed approach to ...
Jernej Pleša, Žiga Kozinc, Nejc Šarabon   +2 more
doaj   +1 more source

Converting DAE models to ODE models: application to reactive Rayleigh distillation [PDF]

, 2013
This paper illustrates the application of an index reduction method to some differential algebraic equations (DAE) modelling the reactive Rayleigh distillation.
Monfreda, Fabien, Belaud, Jean-Pierre, Théry Hétreux, Raphaële, Alloula, Karim   +3 more
core   +2 more sources