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"Countermovement jump" force-time

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https://www.readbyqxmd.com/read/27918658/countermovement-jump-phase-characteristics-of-senior-and-academy-rugby-league-players
#1
John J McMahon, Shannon Murphy, Sophie J E Rej, Paul Comfort
PURPOSE: Gross measures of countermovement jump (CMJ) performance are commonly used to track maturational changes in neuromuscular function within rugby league (RL). The purpose of this study was to conduct both a gross and a more detailed temporal phase analysis of the CMJ performances of senior and academy RL players, to provide greater insight into how neuromuscular function differs between these groups. METHODS: Twenty senior and fourteen academy (under-19) male RL players performed three maximal effort CMJs on a force platform with forward dynamics subsequently employed to allow gross performance measures and entire kinetic and kinematic-time curves to be compared between groups...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27913923/actn3-x-allele-carriers-had-greater-levels-of-muscle-damage-during-a-half-ironman
#2
Juan Del Coso, Juan José Salinero, Beatriz Lara, César Gallo-Salazar, Francisco Areces, Carlos Puente, David Herrero
PURPOSE: Alpha-actinin-3, encoded by the ACTN3 gene, is an actin-binding protein with an important role in myofibril contraction and muscle force output. In humans, there is a relatively common deficiency of the α-actinin-3 due to homozygosity in a polymorphism of the ACTN3 gene (R577X, rs1815739), that has been related to decreased resistance to strain during voluntary muscle contractions. The purpose of this study was to investigate the influence of the ACTN3 genotype on the level of exercise-induced muscle damage attained by 23 experienced triathletes during an official half-ironman competition...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27893479/complex-training-the-effect-of-exercise-selection-and-training-status-on-post-activation-potentiation-in-rugby-league-players
#3
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study compared the post-activation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and ten amateur rugby league players performed two experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14 and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1RM of either HBD or BS. A force platform determined peak power output (PPO), force at PPO, velocity at PPO and jump height of each CMJ...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27820725/training-strategies-to-improve-muscle-power-is-olympic-style-weightlifting-relevant
#4
Christian Helland, Eirik Hole, Erik Iversen, Monica Charlotte Olsson, Olivier Seynnes, Paul Andre Solberg, Gøran Paulsen
INTRODUCTION: This efficacy study investigated the effects of (1) Olympic-style weightlifting (OWL), (2) motorized strength and power training (MSPT), and (3) free weight strength and power training (FSPT) on muscle power. METHODS: Thirty-nine young athletes (20±3 yr.; ice hockey, volleyball and badminton) were randomized into the three training groups. All groups participated in 2-3 sessions/week for 8 weeks. The MSPT and FSPT groups trained using squats (two legs and single leg) with high force and high power, while the OWL group trained using clean and snatch exercises...
November 3, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27803628/improved-maximum-strength-vertical-jump-and-sprint-performance-after-8-weeks-of-jump-squat-training-with-individualized-loads
#5
Vanderka Marián, Longová Katarína, Olasz Dávid, Krčmár Matúš, Walker Simon
The purpose of the study was to determine the effects of 8 weeks of jump squat training on isometric half squat maximal force production (Fmax) and rate of force development over 100ms (RFD100), countermovement jump (CMJ) and squat jump (SJ) height, and 50 m sprint time in moderately trained men. Sixty eight subjects (~21 years, ~180 cm, ~75 kg) were divided into experimental (EXP; n = 36) and control (CON, n = 32) groups. Tests were completed pre-, mid- and post-training. EXP performed jump squat training 3 times per week using loads that allowed all repetitions to be performed with ≥90% of maximum average power output (13 sessions with 4 sets of 8 repetitions and 13 sessions with 8 sets of 4 repetitions)...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27704644/mobility-and-muscle-strength-in-male-former-elite-endurance-and-power-athletes-aged-66-91%C3%A2-years
#6
S Manderoos, N Wasenius, M K Laine, U M Kujala, E Mälkiä, J Kaprio, S Sarna, H M Bäckmand, J A Kettunen, O J Heinonen, A M Jula, S Aunola, J G Eriksson
The aim of this cross-sectional study was to compare mobility and muscle strength in male former elite endurance and power athletes aged 66-91 years (n = 150; 50 men in both former elite athlete groups and in their control group). Agility, dynamic balance, walking speed, chair stand, self-rated balance confidence (ABC-scale), jumping height, and handgrip strength were assessed. Former elite power athletes had better agility performance time than the controls (age- and body mass index, BMI-adjusted mean difference -3...
October 5, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27691454/force-and-power-time-curve-comparison-during-jumping-between-strength-matched-male-and-female-basketball-players
#7
Paige E Rice, Courtney L Goodman, Christopher R Capps, N Travis Triplett, Travis M Erickson, Jeffrey M McBride
The purpose of this study was to compare force- and power-time curve variables during jumping between Division I strength-matched male and female basketball athletes. Males (n = 8) and females (n = 8) were strength matched by testing a one-repetition maximum (1RM) back squat. 1RM back squat values were normalised to body mass in order to demonstrate that strength differences were a function of body mass alone. Subjects performed three countermovement jumps (CMJ) at maximal effort. Absolute and relative force- and power-time curve variables from the CMJs were analysed between males and females...
October 1, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27575250/changes-in-muscle-architecture-explosive-ability-and-track-and-field-throwing-performance-throughout-a-competitive-season-and-following-a-taper
#8
Caleb D Bazyler, Satoshi Mizuguchi, Alex P Harrison, Kimitake Sato, Ashley A Kavanaugh, Brad H DeWeese, Michael H Stone
The purpose of this study was to examine the effects of an overreach and taper on measures of muscle architecture, jumping, and throwing performance in Division I collegiate throwers preparing for conference championships. Six collegiate track and field throwers (3 hammer, 2 discus, 1 javelin) trained for 12 weeks using a block-periodization model culminating with a one week overreach followed by a 3 week taper (ORT). Session rating of perceived exertion training load (RPETL) and strength training volume-load times bar displacement (VLd) were recorded weekly...
August 26, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27557407/the-effect-of-water-temperature-during-cold-water-immersion-on-recovery-from-exercise-induced-muscle-damage
#9
A Vieira, A F Siqueira, J B Ferreira-Junior, J do Carmo, J L Q Durigan, A Blazevich, M Bottaro
This study investigated the effects of 5 and 15°C cold-water immersion on recovery from exercise resulting in exercise-induced muscle damage. 42 college-aged men performed 5×20 drop-jumps and were randomly allocated into one of 3 groups: (1) 5°C; (2) 15°C; or (3) control. After exercise, individuals from the cold-water immersion groups had their lower limbs immerged in iced water for 20 min. Isometric knee extensor torque, countermovement jump, muscle soreness, and creatine kinase were measured before, immediately after, 24, 48, 72, 96 and 168 h post-exercise...
November 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27547851/effects-of-horizontal-plyometric-training-volume-on-soccer-players-performance
#10
Javier Yanci, Asier Los Arcos, Jesús Camara, Daniel Castillo, Alberto García, Carlo Castagna
The aim of this study was to examine the dose response effect of strength and conditioning programmes, involving horizontally oriented plyometric exercises, on relevant soccer performance variables. Sixteen soccer players were randomly allocated to two 6-week plyometric training groups (G1 and G2) differing by imposed (twice a week) training volume. Post-training G1 (4.13%; d = 0.43) and G2 (2.45%; d = 0.53) moderately improved their horizontal countermovement jump performance. Significant between-group differences (p < 0...
October 2016: Research in Sports Medicine
https://www.readbyqxmd.com/read/27457914/impact-of-inertial-training-on-strength-and-power-performance-in-young-active-men
#11
Mariusz Naczk, Alicja Naczk, Wioletta Brzenczek-Owczarzak, Jarosław Arlet, Zdzisław Adach
Naczk, M, Naczk, A, Brzenczek-Owczarzak, W, Arlet, J, and Adach, Z. Impact of inertial training on strength and power performance in young active men. J Strength Cond Res 30(8): 2107-2113, 2016-This study evaluated how 5 weeks of inertial training using 2 different loads influenced strength and power performance. Fifty-eight male physical education students were randomly divided into training and control groups. The 2 training groups (T0 and T10) performed inertial training 3 times per week for 5 weeks using the new Inertial Training and Measurement System (ITMS)...
August 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27398922/aerial-rotation-effects-on-vertical-jump-performance-among-highly-skilled-collegiate-soccer-players
#12
Leland A Barker, John R Harry, Janet S Dufek, John A Mercer
In soccer matches, jumps involving rotations occur when attempting to head the ball for a shot or pass from set pieces such as corner kicks, goal kicks, and lob passes. However, the 3-dimensional ground reaction forces used to perform rotational jumping tasks are currently unknown. Therefore, the purpose of this study was to compare bilateral, 3-dimensional, ground reaction forces of a standard countermovement jump (CMJ0) to a countermovement jump with a 180° rotation (CMJ180) among Division 1 soccer players...
July 7, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27274665/alterations-of-vertical-jump-mechanics-after-a-half-marathon-mountain-running-race
#13
Elissavet N Rousanoglou, Konstantinos Noutsos, Achilleas Pappas, Gregory Bogdanis, Georgios Vagenas, Ioannis A Bayios, Konstantinos D Boudolos
The fatiguing effect of long-distance running has been examined in the context of a variety of parameters. However, there is scarcity of data regarding its effect on the vertical jump mechanics. The purpose of this study was to investigate the alterations of countermovement jump (CMJ) mechanics after a half-marathon mountain race. Twenty-seven runners performed CMJs before the race (Pre), immediately after the race (Post 1) and five minutes after Post 1 (Post 2). Instantaneous and ensemble-average analysis focused on jump height and, the maximum peaks and time-to-maximum peaks of: Displacement, vertical force (Fz), anterior-posterior force (Fx), Velocity and Power, in the eccentric (tECC) and concentric (tCON) phase of the jump, respectively...
June 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27227792/the-role-of-the-trunk-control-in-athletic-performance-of-a-reactive-change-of-direction-task
#14
Suzi Edwards, Aaron Austin, Stephen P Bird
Agility is vital to success in team sport competition with the trunk argued to play a key role in sport performance. This study explored the role of trunk control during a reactive change-of-direction task (R-COD) and field-based measures of athletic performance. Twenty male players completed field-based athletic performance assessments (modified Illinois agility test (mIAT), and three repetition maximum back squat (3RM)), and five countermovement jumps (CMJ) and R-CODs during which, three-dimensional ground reaction forces (GRF) and kinematics were recorded...
May 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27227791/the-effects-of-a-single-whole-body-cryotherapy-exposure-on-physiological-performance-and-perceptual-responses-of-professional-academy-soccer-players-following-repeated-sprint-exercise
#15
M Russell, J Birch, T Love, C J Cook, R M Bracken, T Taylor, E Swift, E Cockburn, C Finn, D Cunningham, L Wilson, L P Kilduff
In professional youth soccer players, the physiological, performance and perceptual effects of a single whole body cryotherapy (WBC) session performed shortly after repeated sprint exercise were investigated. In a randomized, counter-balanced and crossover design, 14 habituated English Premier League academy soccer players performed 15 x 30 m sprints (each followed by a 10 m forced deceleration) on two occasions. Within 20 min of exercise cessation, players entered a WBC chamber (Cryo: 30 s at -60°C, 120 s at -135°C) or remained seated (Con) indoors in temperate conditions (∼25°C)...
May 21, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27191695/warm-up-practices-in-elite-boxing-athletes-impact-on-power-output
#16
B Cunniffe, M Ellison, M Loosemore, M Cardinale
This study evaluated the performance impact of routine warm-up strategies in elite Olympic amateur boxing athletes and physiological implications of the GAP between warm-up and boxing activity. Six male boxers were assessed while performing standardised pre-fight warm-up routines. Core and skin temperature measurements (Tcore and Tskin), heart-rate (HR), and upper and lower body power-output (PO) were assessed before and following warm-up, during a 25 min GAP and after 3 x 2 min rounds of sparring. Reflected temperature (Tc) was also determined using high-resolution thermal images at fixed time-points to explore avenues for heat loss...
May 14, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27172267/traditional-vs-sport-specific-vertical-jump-tests-reliability-validity-and-relationship-with-the-legs-strength-and-sprint-performance-in-adult-and-teen-soccer-and-basketball-players
#17
David Rodriguez-Rosell, Ricardo Mora-Custodio, Felipe Franco-Márquez, Juan Manuel Yáñez-García, Juan José González-Badillo
The vertical jump is considered an essential motor skill in many team sports. Many protocols have been used to assess vertical jump ability. However, controversy regarding test selection still exists based upon the reliability and specificity of the tests. The main aim of this study was to analyze the reliability and validity of two standardized [Countermovement jump (CMJ) and Abalakov jump (AJ)] and two sport-specific [run-up with two (2-LEGS) or one leg (1-LEG) take-off jump] vertical jump tests, and their usefulness as predictors of sprint and strength performance for soccer (n = 127) and basketball (n = 59) players in three different categories (Under-15, Under-18 and Adults)...
May 9, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27140680/single-leg-power-output-and-between-limb-imbalances-in-team-sports-players-unilateral-vs-bilateral-combined-resistance-training
#18
Oliver Gonzalo-Skok, Julio Tous-Fajardo, Luis Suarez-Arrones, José Luis Arjol-Serrano, José Antonio Casajús, Alberto Mendez-Villanueva
PURPOSE: The aim of the present study was to compare the effects of unilateral and bilateral resistance training on single-leg power output, between-limb imbalance (BLI), bilateral deficit (BLD), change of direction (COD), linear sprinting and jumping performance in young elite basketball players. METHODS: Twenty-two young (U-16 to U-19) male basketball players were randomly assigned either to exclusive unilateral (UNI) (n=11) or bilateral (BIL) (n=11) resistance training group during a 6-week period...
May 3, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27140284/physical-predictors-of-elite-skeleton-start-performance
#19
Steffi L Colyer, Keith A Stokes, L J Bilzon J, Marco Cardinale, Aki I Salo
PURPOSE: An extensive battery of physical tests is typically employed to evaluate athletic status and/or development often resulting in a multitude of output variables. We aimed to identify independent physical predictors of elite skeleton start performance overcoming the general problem of practitioners employing multiple tests with little knowledge of their predictive utility. METHODS: Multiple two-day testing sessions were undertaken by 13 high-level skeleton athletes across a 24-week training season and consisted of flexibility, dry-land push-track, sprint, countermovement jump and leg press tests...
May 1, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27138059/preseason-changes-in-markers-of-lower-body-fatigue-and-performance-in-young-professional-rugby-union-players
#20
Gregory A B Roe, Joshua D Darrall-Jones, Kevin Till, Ben Jones
This study investigated the changes in measures of neuromuscular fatigue and physical performance in young professional rugby union players during a preseason training period. Fourteen young (age: 19.1 ± 1.2 years) professional rugby union players participated in the study. Changes in measures of lower body neuromuscular fatigue (countermovement jump (CMJ) mean power, mean force, flight-time) and physical performance (lower body strength, 40 m sprint velocity) were assessed during an 11-week preseason period using magnitude-based inferences...
November 2016: European Journal of Sport Science
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