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"Reactive strength index modified"

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https://www.readbyqxmd.com/read/26439787/reactive-strength-index-modified-is-a-valid-measure-of-explosiveness-in-collegiate-female-volleyball-players
#1
Kristof Kipp, Michael T Kiely, Christopher F Geiser
The purpose of this study was to investigate the validity of the reactive strength index modified (RSImod) as a measure of lower body explosiveness. Fifteen female, National Collegiate Athletic Association Division I volleyball players performed vertical countermovement jumps (CMJs) while standing on a force plate. Each player performed 3 CMJs. The vertical ground reaction forces collected during each jump were used to calculate jump height, time to take-off, time to peak force, peak force, peak rate of force development, and peak power; the latter 3 variables were all normalized to body mass...
May 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26200196/comparison-of-methods-that-assess-lower-body-stretch-shortening-cycle-utilization
#2
COMPARATIVE STUDY
Timothy J Suchomel, Christopher J Sole, Michael H Stone
The purpose of this study was to compare 4 methods that assess the lower-body stretch-shortening cycle (SSC) utilization of athletes. Eighty-six National Collegiate Athletic Association Division I athletes from 6 different sports performed 2 squat jumps and 2 countermovement jumps on a force platform. Pre-stretch augmentation percentage (PSAP), eccentric utilization ratio (EUR), and reactive strength (RS) for jump height (JH) and peak power (PP) magnitudes, and reactive strength index-modified (RSImod) were calculated for each team...
February 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25436634/a-comparison-of-reactive-strength-index-modified-between-six-u-s-collegiate-athletic-teams
#3
COMPARATIVE STUDY
Timothy J Suchomel, Christopher J Sole, Christopher A Bailey, Jacob L Grazer, George K Beckham
The purpose of this study was to examine the differences in reactive strength index-modified (RSImod), jump height (JH), and time to takeoff (TTT) between 6 U.S. collegiate sport teams. One hundred six male and female Division I collegiate athletes performed unloaded (<1 kg) and loaded (20 kg) countermovement jumps as part of an ongoing athlete monitoring program. Reactive strength index-modified, JH, and TTT values for each team were compared using 1-way analysis of variance. Statistically significant differences in RSImod (p < 0...
May 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25426515/using-reactive-strength-index-modified-as-an-explosive-performance-measurement-tool-in-division-i-athletes
#4
Timothy J Suchomel, Christopher A Bailey, Christopher J Sole, Jacob L Grazer, George K Beckham
The purposes of this study included examining the reliability of reactive strength index-modified (RSImod), the relationships between RSImod and force-time variables, and the differences in RSImod between male and female collegiate athletes. One hundred six Division I collegiate athletes performed unloaded and loaded countermovement jumps (CMJs). Intraclass correlation coefficients and typical error expressed as a coefficient of variation were used to establish the relative and absolute reliability of RSImod, respectively...
April 2015: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/20634740/using-the-reactive-strength-index-modified-to-evaluate-plyometric-performance
#5
William P Ebben, Erich J Petushek
The ability to develop force quickly is a requisite ability in most sports. The reactive strength index (RSI) has been developed as a measure of explosive strength and is derived by evaluating jump height divided by ground contact time during the depth jump (DJ). At present, the RSI is typically used to evaluate DJ performance, because it is the only plyometric exercise with an identifiable ground contact time. The purpose of this study was to introduce a modification of the RSI (RSImod) that can be used to evaluate the explosive power of any vertical plyometric exercise...
August 2010: Journal of Strength and Conditioning Research
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