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"Jump squat" force-velocity

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https://www.readbyqxmd.com/read/27632577/the-neuromuscular-qualities-of-higher-and-lower-level-mixed-martial-arts-competitors
#1
Lachlan P James, Emma M Beckman, Vincent G Kelly, G Gregory Haff
PURPOSE: To determine whether the maximal strength, impulse and power characteristics of competitive mixed martial arts (MMA) athletes differ according to competition level. METHODS: Twenty-nine male semi-professional and amateur MMA competitors were stratified into either higher-level (HL) or lower-level (LL) performers on the basis of competition grade and success. The one-repetition maximum (1RM) squat was used to assess lower body dynamic strength, while a spectrum of impulse, power, force and velocity variables were evaluated during an incremental load jump squat...
September 15, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27210829/bar-velocities-capable-of-optimising-the-muscle-power-in-strength-power-exercises
#2
Irineu Loturco, Lucas Adriano Pereira, Cesar Cavinato Cal Abad, Facundo Tabares, José Eduardo Moraes, Ronaldo Kobal, Katia Kitamura, Fabio Yuzo Nakamura
This study aimed at testing whether there are mean propulsive velocities (MPVs) capable of maximising the mean propulsive power (MPP) during the execution of bench press (BP), bench throw (BT), half squat (HS) and jump squat (JS). Additionally, we assessed the differences in MPP/MPV between ballistic and traditional exercises. Seventeen male rugby sevens players performed MPP tests in BP, BT, HS and JS and maximum isometric force (MIF) tests in HS and BP. The JS presented higher MPP (977.4 ± 156.2 W) than the HS (897...
May 21, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/24345969/regression-models-of-sprint-vertical-jump-and-change-of-direction-performance
#3
Paul A Swinton, Ray Lloyd, Justin W L Keogh, Ioannis Agouris, Arthur D Stewart
It was the aim of the present study to expand on previous correlation analyses that have attempted to identify factors that influence performance of jumping, sprinting, and changing direction. This was achieved by using a regression approach to obtain linear models that combined anthropometric, strength, and other biomechanical variables. Thirty rugby union players participated in the study (age: 24.2 ± 3.9 years; stature: 181.2 ± 6.6 cm; mass: 94.2 ± 11.1 kg). The athletes' ability to sprint, jump, and change direction was assessed using a 30-m sprint, vertical jump, and 505 agility test, respectively...
July 2014: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/22614146/peak-power-force-and-velocity-during-jump-squats-in-professional-rugby-players
#4
Anthony P Turner, Cedric N Unholz, Neill Potts, Simon G S Coleman
Training at the optimal load for peak power output (PPO) has been proposed as a method for enhancing power output, although others argue that the force, velocity, and PPO are of interest across the full range of loads. The aim of this study was to examine the influence of load on PPO, peak barbell velocity (BV), and peak vertical ground reaction force (VGRF) during the jump squat (JS) in a group of professional rugby players. Eleven male professional rugby players (age, 26 ± 3 years; height, 1.83 ± 6.12 m; mass, 97...
June 2012: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/22505130/a-rationale-for-assessing-the-lower-body-power-profile-in-team-sport-athletes
#5
Maria L Nibali, Dale W Chapman, Robert A Robergs, Eric J Drinkwater
Training at the load that maximizes peak mechanical power (Pmax) is considered superior for the development of power. We aimed to identify the Pmax load ('optimal load') in the jump squat and to quantify small, moderate, large, and very large substantial differences in power output across a spectrum of loads to identify loads that are substantially different to the optimal, and lastly, to investigate the nature of power production (load-force-velocity profiles). Professional Australian Rules Football (ARF; n = 16) and highly trained Rugby Union (RU; n = 20) players (subdivided into stronger [SP] vs...
February 2013: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/22085898/a-comparison-of-ballistic-and-nonballistic-lower-body-resistance-exercise-and-the-methods-used-to-identify-their-positive-lifting-phases
#6
COMPARATIVE STUDY
Jason Lake, Mike Lauder, Neal Smith, Kathleen Shorter
This study compared differences between ballistic jump squat (B) and nonballistic back squat (NB) force, velocity, power, and relative acceleration duration, and the effect that the method used to identify the positive lifting phase had on these parameters. Ground reaction force and barbell kinematics were recorded from 30 resistance trained men during B and NB performance with 45% 1RM. Force, velocity, and power was averaged over positive lifting phases identified using the traditional peak barbell displacement (PD) and positive impulse method...
August 2012: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/21934171/the-effect-of-cluster-loading-on-force-velocity-and-power-during-ballistic-jump-squat-training
#7
Keir T Hansen, John B Cronin, Michael J Newton
PURPOSE: The purpose of this study was to investigate the effect of set structure, in terms of repetition work:rest ratios on force, velocity, and power during jump squat training. METHODS: Twenty professional and semiprofessional rugby players performed training sessions comprising four sets of 6 repetitions of a jump squat using four different set configurations. The first involved a traditional configuration (TR) of 4 × 6 repetitions with 3 min of rest between sets, the second (C1) 4 × 6 × singles (1 repetition) with 12 s of rest between repetitions, the third (C2) 4 × 3 × doubles (2 repetitions) with 30 s of rest between pairs, and the third (C3) 4 × 2 × triples (3 repetitions) with 60 s of rest between triples...
December 2011: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/21912288/peak-power-force-and-velocity-during-jump-squats-in-professional-rugby-players-power-force-velocity-during-jump-squats
#8
Anthony P Turner, Cedric Unholz, Neill Potts, Simon Gs Coleman
Training at the optimal load for peak power output (PPO) has been proposed as a method for enhancing power output, although others argue that the force, velocity and PPO are of interest across the full range of loads. The aim of the present study was to examine the influence of load on PPO, peak barbell velocity and peak vertical ground reaction force during the jump squat (JS) in a group of professional rugby players. Eleven male professional rugby players (age, 26 ± 3 years; height, 1.83 ± 6.12 m; mass, 97...
September 9, 2011: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/21777152/effect-of-loading-on-peak-power-of-the-bar-body-and-system-during-power-cleans-squats-and-jump-squats
#9
Jeffrey M McBride, Tracie L Haines, Tyler J Kirby
Nine males (age 24.7 ± 2.1 years, height 175.3 ± 5.5 cm, body mass 80.8 ± 7.2 kg, power clean 1-RM 97.1 ± 6.36 kg, squat 1-RM = 138.3 ± 20.9 kg) participated in this study. On day 1, the participants performed a one-repetition maximum (1-RM) in the power clean and the squat. On days 2, 3, and 4, participants performed the power clean, squat or jump squat. Loading for the power clean ranged from 30% to 90% of the participant's power clean 1-RM and loading for the squat and jump squat ranged from 0% to 90% of the participant's squat 1-RM, all at 10% increments...
August 2011: Journal of Sports Sciences
https://www.readbyqxmd.com/read/21747288/does-cluster-loading-enhance-lower-body-power-development-in-preseason-preparation-of-elite-rugby-union-players
#10
RANDOMIZED CONTROLLED TRIAL
Keir T Hansen, John B Cronin, Stuart L Pickering, Michael J Newton
The purpose of this study was to ascertain whether cluster training led to improved power training adaptations in the preseason preparation of elite level rugby union players. Eighteen highly trained athletes were divided into 2 training groups, a traditional training (TT, N = 9) group and a cluster training (CT, N = 9) group before undertaking 8 weeks of lower body resistance training. Force-velocity-power profiling in the jump squat movement was undertaken, and maximum strength was assessed in the back squat before and after the training intervention...
August 2011: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/20639724/influence-of-strength-on-magnitude-and-mechanisms-of-adaptation-to-power-training
#11
RANDOMIZED CONTROLLED TRIAL
Prue Cormie, Michael R McGuigan, Robert U Newton
PURPOSE: To determine whether the magnitude of performance improvements and the mechanisms driving adaptation to ballistic power training differ between strong and weak individuals. METHODS: Twenty-four men were divided into three groups on the basis of their strength level: stronger (n = 8, one-repetition maximum-to-body mass ratio (1RM/BM) = 1.97 +/- 0.08), weaker (n = 8, 1RM/BM = 1.32 +/- 0.14), or control (n = 8, 1RM/BM = 1.37 +/- 0.13). The stronger and weaker groups trained three times per week for 10 wk...
August 2010: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/20139780/adaptations-in-athletic-performance-after-ballistic-power-versus-strength-training
#12
RANDOMIZED CONTROLLED TRIAL
Prue Cormie, Michael R McGuigan, Robert U Newton
PURPOSE: To determine whether the magnitude of improvement in athletic performance and the mechanisms driving these adaptations differ in relatively weak individuals exposed to either ballistic power training or heavy strength training. METHODS: Relatively weak men (n = 24) who could perform the back squat with proficient technique were randomized into three groups: strength training (n = 8; ST), power training (n = 8; PT), or control (n = 8). Training involved three sessions per week for 10 wk in which subjects performed back squats with 75%-90% of one-repetition maximum (1RM; ST) or maximal-effort jump squats with 0%-30% 1RM (PT)...
August 2010: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/17530944/acute-effects-of-augmented-eccentric-loading-on-jump-squat-performance
#13
Christopher A Moore, Lawrence W Weiss, Brian K Schilling, Andrew C Fry, Yuhua Li
The purpose of this study was to determine the acute effects of a spectrum of eccentric loads on force, velocity, and power during the concentric portion of maximal-effort jump squats utilizing a repeated measures design. Thirteen resistance-trained men (age = 22.8 +/- 2.9 years, weight = 87.1 +/- 11.8 kg, 163.5 +/- 28.6 kg squat 1 repetition maximum [1RM]; mean +/- SD), who routinely incorporated back squats into their training, participated as subjects in this investigation. Jump squat performance was assessed using 4 experimental conditions...
May 2007: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/17277599/optimal-loading-for-maximal-power-output-during-lower-body-resistance-exercises
#14
COMPARATIVE STUDY
Prue Cormie, Grant O McCaulley, N Travis Triplett, Jeffrey M McBride
PURPOSE: The influence of various loads on power output in the jump squat (JS), squat (S), and power clean (PC) was examined to determine the load that maximizes power output in each lift. METHODS: Twelve Division I male athletes participated in four testing sessions. The first session involved performing one-repetition maximums (1RM) in the S and PC, followed by three randomized testing sessions involving either the JS, S, or PC. Peak force, velocity, and power were calculated across loads of 0, 12, 27, 42, 56, 71, and 85% of each subject's 1RM in the JS and S and at 10% intervals from 30 to 90% of each subject's 1RM in the PC...
February 2007: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/12587892/the-effects-of-bungy-weight-training-on-muscle-function-and-functional-performance
#15
RANDOMIZED CONTROLLED TRIAL
John Cronin, Peter J McNair, Robert N Marshall
Eccentric strength training is thought to be important for improving functional performance. A form of training that may enhance the eccentric training stimulus is the attachment of a rubber bungy to the strength-training apparatus in such a way that the return velocity and, therefore, the force required to decelerate the load at the end of the eccentric phase are increased. To determine the effects of elastic bungy training, we performed two studies. In the first, we examined the electromyographic (EMG) and kinematic characteristics of three different squat techniques: traditional squat, non-bungy jump squat and bungy jump squat...
January 2003: Journal of Sports Sciences
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