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"Countermovement jump"

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https://www.readbyqxmd.com/read/29789267/the-effect-of-lower-limb-occlusion-on-recovery-following-sprint-exercise-in-academy-rugby-players
#1
N Williams, M Russell, C J Cook, L P Kilduff
OBJECTIVES: The effects of vascular occlusion on recovery of physiological and neuromuscular markers over 24h, and hormonal reactivity to subsequent exercise were investigated. DESIGN: Counterbalanced, randomised, crossover. METHODS: Academy rugby players (n=24) completed six 50-m sprints (5-min inter-set recovery) before occlusion cuff application (thighs) and intermittent inflation to 171-266mmHg (Recovery) or 15mmHg (Con) for 12-min (two sets, 3-min repetitions, 3-min non-occluded reperfusion)...
March 3, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29788859/female-judo-athletes-physical-test-performances-are-unrelated-to-technical-tactical-competition-skills
#2
Rafael L Kons, Juliano Dal Pupo, Jonathan Ache-Dias, Daniele Detanico
This study analyzed the relationship between generic and judo-specific physical test performances and technical-tactical competition performances among 19 female judo athletes. Participant data were gathered in two stages: (a) physical tests-countermovement jump (CMJ), handgrip strength, Special Judo Fitness Test and Judogi Grip Strength Test; and (b) match performances recorded for technical-tactical analysis. Pearson's linear correlation and multiple linear regression analysis showed no significant correlations between any technical-tactical parameter and judo-specific physical tests...
January 1, 2018: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29786624/relationship-between-dryland-strength-and-swimming-performance-pull-up-mechanics-as-a-predictor-of-swimming-speed
#3
José I Pérez-Olea, Pedro L Valenzuela, Concepción Aponte, Mikel Izquierdo
Pérez-Olea, JI, Valenzuela, PL, Aponte, C, and Izquierdo, M. Relationship between dryland strength and swimming performance: pull-up mechanics as a predictor of swimming speed. J Strength Cond Res 32(6): 1637-1642, 2018-This study aimed to examine the validity of the countermovement jump (CMJ) and the pull-up exercise as predictors of swimming performance. Twelve young male swimmers (Mean ± SD, 19 ± 3 years; 75 ± 10 kg; 180 ± 6 cm) with a homogenous level of performance (50-m freestyle time [50F]: 26.41 ± 1...
June 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29782223/do-the-peak-and-mean-force-methods-of-assessing-vertical-jump-force-asymmetry-agree
#4
Jason P Lake, Peter D Mundy, Paul Comfort, Timothy J Suchomel
The aim of this study was to assess agreement between peak and mean force methods of quantifying force asymmetry during the countermovement jump (CMJ). Forty-five men performed four CMJ with each foot on one of two force plates recording at 1,000 Hz. Peak and mean were obtained from both sides during the braking and propulsion phases. The dominant side was obtained for the braking and propulsion phase as the side with the largest peak or mean force and agreement was assessed using percentage agreement and the kappa coefficient...
May 21, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29751254/isometric-pre-conditioning-blunts-exercise-induced-muscle-damage-but-does-not-attenuate-changes-in-running-economy-following-downhill-running
#5
Leonardo C R Lima, Natália M Bassan, Adalgiso C Cardozo, Mauro Gonçalves, Camila C Greco, Benedito S Denadai
Running economy (RE) is impaired following unaccustomed eccentric-biased exercises that induce muscle damage. It is also known that muscle damage is reduced when maximal voluntary isometric contractions (MVIC) are performed at a long muscle length 2-4 days prior to maximal eccentric exercise with the same muscle, a phenomenon that can be described as isometric pre-conditioning (IPC). We tested the hypothesis that IPC could attenuate muscle damage and changes in RE following downhill running. Thirty untrained men were randomly assigned into experimental or control groups and ran downhill on a treadmill (-15%) for 30 min...
May 8, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29742747/improving-the-signal-to-noise-ratio-when-monitoring-countermovement-jump-performance
#6
Rodney A Kennedy, David Drake
Kennedy, RA and Drake, D. Improving the signal-to-noise ratio when monitoring countermovement jump performance. J Strength Cond Res XX(X): 000-000, 2018-Countermovement jump (CMJ) performance has been routinely used to monitor neuromuscular status. However, the protocol used to establish the criterion score is not well documented. The purpose of this study was to examine how the protocol used would influence of the sensitivity of CMJ variables in rugby union players. Fifteen male (age: 19.7 ± 0.5 years) rugby union players performed 8 CMJs on 2 occasions, separated by 7 days...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29730331/higher-muscle-power-training-volume-is-not-determinant-for-the-magnitude-of-neuromuscular-improvements-in-elderly-women
#7
Régis Radaelli, Clarissa M Brusco, Pedro Lopez, Anderson Rech, Carlos L Machado, Rafael Grazioli, Diana C Muller, Eduardo L Cadore, Ronei S Pinto
The aim of this study was to compare the effects of 12 weeks of muscle power training using one- and three-sets on neuromuscular adaptations in elderly women. Twenty six healthy elderly women were randomly assigned into two groups: one-set (n = 13) and three-sets (n = 13). Maximal dynamic and isometric strength, rapid force assessed as absolute and normalized rate of force development (RTD) and contractile impulse during unilateral leg knee extension at 0-50 and 0-200 ms, overall quadriceps muscle thickness, muscle power during a countermovement jump (CMJ), and functional performance using time-up-and-go and the timed stair climb tests were evaluated before and after training...
May 3, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29702520/relationship-between-selected-physical-qualities-bowling-kinematics-and-pace-bowling-skill-in-club-standard-cricketers
#8
Simon A Feros, Warren B Young, Brendan J OʼBrien
Feros, SA, Young, WB, and O'Brien, BJ. Relationship between selected physical qualities, bowling kinematics, and pace bowling skill in club-standard cricketers. J Strength Cond Res XX(X): 000-000, 2018-Although strength and conditioning of cricket pace bowlers has become more specialized in recent times, little is understood about the interplay between physical capacities, pace bowling kinematics, and pace bowling skill measures. This study sought to determine these interrelationships. Thirty-one male club-standard pace bowlers completed 3 test sessions on separate occasions 4-7 days apart...
April 26, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29670536/multi-directional-repeated-sprint-is-a-valid-and-reliable-test-for-assessment-of-junior-handball-players
#9
Amin Daneshfar, Daniel E Gahreman, Majid S Koozehchian, Sadegh Amani Shalamzari, Mozhgan Hassanzadeh Sablouei, Thomas Rosemann, Beat Knechtle, Pantelis T Nikolaidis
The aim of the present study was to examine the validity and reliability of a 10 × (6 × 5 m) multi-directional repeated sprint ability test (RSM) in elite young team handball (TH) players. Participants were members of the Iranian national team ( n = 20, age 16.4 ± 0.7 years, weight 82.5 ± 5.5 kg, height 184.8 ± 4.6 cm, body fat 15.4 ± 4.3%). The validity of RSM was tested against a 10 × (15 + 15 m) repeated sprint ability test (RSA), Yo-Yo Intermittent Recovery test Level 1 (Yo-Yo IR1), squat jump (SJ) and countermovement jump (CMJ)...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29666769/joint-level-energetics-differentiate-isoinertial-from-speed-power-resistance-training-a-bayesian-analysis
#10
Bernard X W Liew, Christopher C Drovandi, Samuel Clifford, Justin W L Keogh, Susan Morris, Kevin Netto
Background: There is convincing evidence for the benefits of resistance training on vertical jump improvements, but little evidence to guide optimal training prescription. The inability to detect small between modality effects may partially reflect the use of ANOVA statistics. This study represents the results of a sub-study from a larger project investigating the effects of two resistance training methods on load carriage running energetics. Bayesian statistics were used to compare the effectiveness of isoinertial resistance against speed-power training to change countermovement jump (CMJ) and squat jump (SJ) height, and joint energetics...
2018: PeerJ
https://www.readbyqxmd.com/read/29658525/countermovement-depth-a-variable-which-clarifies-the-relationship-between-the-maximum-power-output-and-height-of-a-vertical-jump
#11
Jan Gajewski, Radosław Michalski, Krzysztof Buśko, Joanna Mazur-Różycka, Zbigniew Staniak
PURPOSE: The aim of this study was to identify the determinants of peak power achieved during vertical jumps in order to clarify relationship between the height of jump and the ability to exert maximum power. METHODS: One hundred young (16.8±1.8 years) sportsmen participated in the study (body height 1.861 ± 0.109 m, body weight 80.3 ± 9.2 kg). Each participant performed three jump tests: countermovement jump (CMJ), akimbo countermovement jump (ACMJ), and spike jump (SPJ)...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29629620/differential-training-loads-and-individual-fitness-responses-to-pre-season-in-professional-rugby-union-players
#12
Shaun J McLaren, Andrew Smith, Jonathan D Bartlett, Iain R Spears, Matthew Weston
We aimed to compare differentiated training loads (TL) between fitness responders and non-responders to an eight-week pre-season training period in a squad of thirty-five professional rugby union players. Differential TL were calculated by multiplying player's perceptions of breathlessness (sRPE-B) and leg muscle exertion (sRPE-L) with training duration for each completed session. Performance-based fitness measures included the Yo-Yo Intermittent Recovery Test Level 1 (YYIRTL1), 10-, 20-, and 30-m linear sprint times, countermovement jump height (CMJ) and predicted one-repetition maximum back squat (P1RM Squat)...
April 9, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29619805/using-blood-lactate-concentration-to-predict-muscle-damage-and-jump-performance-response-to-maximal-stretch-shortening-cycle-exercise
#13
Vladimir Manojlović, Frane Erčulj
BACKGROUND: It is well known that eccentric muscle contractions induce delayed onset muscle soreness (DOMS) and exertional rhabdomyolysis (ERB), both of which are related to high blood levels of muscle damage markers after exercise. Creatine kinase (CK) is, together with some other markers (e.i. myoglobin, α-actin, skeletal troponin), widely used in determination of muscle damage. Moreover, DOMS after eccentric exercise has been shown to be associated with altered blood lactate concentration after subsequent submaximal or maximal cycling exercise...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29619797/acute-neuromuscular-responses-to-short-and-long-roundhouse-kick-striking-paces-in-professional-muay-thai-fighters
#14
Giuseppe Cimadoro, Ryan Mahaffey, Nicolas Babault
BACKGROUND: Muay Thai fighters strongly rely on the use of the roundhouse kick due to its effectiveness (i.e. power) and implications on the final score. Therefore, different striking tempos at full power are used during training as a method to enhance kicking power. However, the neuromuscular responses are unknown. Thus, the goal of this study was to investigate neuromuscular responses to a single bout of shorter (every second = H1) and longer (every 3s = H3) kick striking time intervals, measured with the countermovement jump (CMJ)...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29599873/physical-performance-comparison-between-under-15-elite-and-sub-elite-soccer-players
#15
Athos Trecroci, Zoran Milanović, Matteo Frontini, F Marcello Iaia, Giampietro Alberti
The aim of this study was to compare the physical performance profile among young soccer players of different competitive levels. Two teams of elite (n = 22) and sub-elite (n = 22) soccer players at national (highly skilled) and regional (moderately skilled) level were recruited in the study. All participants were tested using a modified Illinois change of direction speed test, a T-drill with and without a ball, a countermovement jump, and a 10-m sprint. The analysis revealed significant differences in favor of elite players in sprint (d = 1...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599872/responsiveness-of-the-countermovement-jump-and-handgrip-strength-to-an-incremental-running-test-in-endurance-athletes-influence-of-sex
#16
Felipe García-Pinillos, Pedro Delgado-Floody, Cristian Martínez-Salazar, Pedro Á Latorre-Román
The present study analyzed the acute effects of an incremental running test on countermovement jump (CMJ) and handgrip strength performance in endurance athletes, considering the effect of post-exercise recovery time and sex. Thirty-three recreationally trained long-distance runners, 20 men and 13 women, participated voluntarily in this study. The participants performed the Léger test, moreover, the CMJ and handgrip strength tests were carried out before and after the running test and during different stages of recovery (at the 1st min of recovery (posttest1), 5th min of recovery (posttest2), and 10th min of recovery (posttest3))...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599866/impact-of-official-matches-on-soccer-referees-power-performance
#17
Daniel Castillo, Javier Yanci, Jesús Cámara
The evaluation of match officials' neuromuscular performance is now an important consideration and the vertical jump test is considered suitable for assessing lower limb power, partly because it is directly related to refereeing. The aim of this study, therefore, was to determine the effect of soccer matches on match officials' vertical jump performance by assessing various biomechanical variables. Eighteen field referees (FRs) and 36 assistant referees (ARs) who officiated in 18 official matches participated in this study...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29589410/six-weeks-of-multi-station-program-on-the-knee-proprioception-and-performance-of-futsal-players
#18
Ángel Pérez-Silvestre, Daniel Albert-Lucena, Guido F Gómez-Chiguano, Gustavo Plaza-Manzano, Daniel Pecos-Martín, Tomás Gallego-Izquierdo, Patricia Martín-Casas, Natalia Romero-Franco
BACKGROUND: Proprioception and vertical jump are important parameters in the performance and prevention of injuries in futsal. However, very few studies have analyzed the role of multi-station exercises to improve these variables. The purpose of this study was to assess the effects of a six-week multi-station exercise program on knee joint position sense (JPS) and countermovement jump (CMJ) of futsal players. METHODS: Thirty-four male futsal players randomly classified into experimental (n = 17) or control group (n = 17)...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29584530/monitoring-training-load-recovery-and-performance-of-brazilian-professional-volleyball-players-during-a-season
#19
Paula B Debien, Marcelly Mancini, Danilo R Coimbra, Daniel G S de Freitas, Renato Miranda, Maurício G Bara Filho
PURPOSE: The aim of this study is to describe and analyze the distribution of internal training load (ITL), recovery, and physical performance of professional volleyball players throughout one season. METHODS: 15 male professional Brazilian volleyball players participated in this study. The session rating of perceived exertion (session-RPE) and Total Quality Recovery (TQR) score were collected daily for 36 weeks. The session-RPE was collected after each training session and the TQR before the first session of the day...
March 27, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29584462/effects-of-caffeinated-gum-on-a-battery-of-soccer-specific-tests-in-trained-university-standard-male-soccer-players
#20
Mayur K Ranchordas, George King, Mitchell Russell, Anthony Lynn, Mark Russell
The purpose of this study was to determine whether caffeinated gum influenced performance in a battery of soccer-specific tests used in the assessment of performance in soccer players. In a double blind, randomised, cross-over design, ten male university-standard soccer players (age 19 ± 1 y, stature 1.80 ± 0.10 m, body mass 75.5 ± 4.8 kg) masticated a caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum on two separate occasions. After a standardised warm-up, gum was chewed for 5 min and subsequently expectorated 5 min before players performed a maximal countermovement jump, a 20 m sprint test and the Yo-Yo intermittent recovery test level 1 (Yo-YoIR1)...
March 27, 2018: International Journal of Sport Nutrition and Exercise Metabolism
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