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https://www.readbyqxmd.com/read/27928208/the-interaction-of-fatigue-and-potentiation-following-an-acute-bout-of-unilateral-squats
#1
Samantha K Andrews, Jesse M Horodyski, Daniel A MacLeod, Joseph Whitten, David G Behm
A prior conditioning resistance exercise can augment subsequent performance of the affected muscles due to the effects of post-activation potentiation (PAP). The non-local muscle fatigue literature has illustrated the global neural effects of unilateral fatigue. However, no studies have examined the possibility of acute non-local performance enhancements. The objective of the study was to provide a conditioning stimulus in an attempt to potentiate the subsequent jump performance of the affected limb and determine if there were performance changes in the contralateral limb...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27918677/a-comparison-of-isometric-mid-thigh-pull-strength-vertical-jump-sprint-speed-and-change-of-direction-speed-in-academy-netball-players
#2
Christopher Thomas, Paul Comfort, Paul A Jones, Thomas Dos'Santos
PURPOSE: To investigate (a) the relationships between maximal isometric strength, vertical jump (VJ), sprint speed, and change of direction speed (CODS) in academy netball players, and (b) determine whether players who have high performance in isometric strength testing would demonstrate superior performance in VJ, sprint speed, and CODS measures. METHODS: Twenty-six young female netball players (age = 16.1 ± 1.2 years; height = 173.9 ± 5.7 cm; body mass = 66...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918240/circadian-rhythm-effect-on-physical-tennis-performance-in-trained-male-players
#3
Álvaro López-Samanes, Diego Moreno-Pérez, José L Maté-Muñoz, Raúl Domínguez, Jesús G Pallarés, Ricardo Mora-Rodriguez, Juan F Ortega
To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS), agility T-test (AGIL) and a 10-m sprint (10-m RUN). In a randomised, counter-balance order, tennis players underwent the test battery twice, either in the morning (i.e., AM; 9:00 h) and in the afternoon (i...
December 5, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27893481/the-effect-of-exercise-induced-muscle-damage-after-a-bout-of-accentuated-eccentric-load-drop-jumps-and-the-repeated-bout-effect
#4
Lee A Bridgeman, Nicholas D Gill, Deborah K Dulson, Michael R McGuigan
Although previous studies have investigated exercise induced muscle damage (EIMD) after a bout of unloaded drop jumps (DJ) none have investigated the effects of accentuated eccentric load (AEL) DJs on EIMD. The purpose of this study was to investigate the effects of 30 and 50 AEL DJs on strength, jump performance, muscle soreness and blood markers. Eight resistance trained athletes participated in this study. In week 1 baseline countermovement jump (CMJ), squat jump (SJ), concentric and eccentric peak force (PF), creatine kinase (CK) and muscle soreness (SOR) were assessed...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27876280/validity-and-intra-rater-reliability-of-myjump-app-on-iphone-6s-in-jump-performance
#5
Robert Stanton, Sally-Anne Wintour, Crystal O Kean
OBJECTIVES: Smartphone applications are increasingly used by researchers, coaches, athletes and clinicians. The aim of this study was to examine the concurrent validity and intra-rater reliability of the smartphone-based application, MyJump, against laboratory-based force plate measurements. DESIGN: Cross sectional study. METHODS: Participants completed counter-movement jumps (CMJ) (n=29) and 30cm drop jumps (DJ) (n=27) on a force plate which were simultaneously recorded using MyJump...
November 11, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27874306/power-and-speed-differences-between-brazilian-paralympic-sprinters-with-visual-impairment-and-their-guides
#6
Lucas Pereira, Ciro Winckler, Cesar C Cal Abad, Ronaldo Kobal, Katia Kitamura, Amaury Veríssimo, Fabio Y Nakamura, Irineu Loturco
This study compared the physical performance of Paralympic sprinters with visual impairments (PSVI) and their guides in jump and sprint tests. Ten PSVI and guides executed squat jumps (SJ), countermovement jumps (CMJ), horizontal quintuple right/left-leg jumps (QR/QL), decuple jumps (DEC), and 50-m-sprint tests. The guides were superior to the PSVI in SJ (35.9 ± 6.3 vs 45.6 ± 3.2 cm), CMJ (38.5 ± 6.2 vs 46.7 ± 4.0 cm), QR (9.2 ± 1.9 vs 12.7 ± 1.0 m), QL (9.4 ± 1.9 vs 13.1 ± 0.8 m), DEC (21.0 ± 3.3 vs...
October 2016: Adapted Physical Activity Quarterly: APAQ
https://www.readbyqxmd.com/read/27849114/effects-of-in-season-short-term-aerobic-and-high-intensity-interval-training-program-on-repeated-sprint-ability-and-jump-performance-in-handball-players
#7
Souhail Hermassi, Jørgen Ingebrigtsen, René Schwesig, Georg Fieseler, Karl S Delank, Karim Chamari, Roy J Shephard, Mohamed S Chelly
BACKGROUND: This study examined the effects of a 7-week in-season aerobic and high-intensity interval-training program on performance tests linked to successful handball play (e.g., repeated sprint and jumping ability). METHODS: Thirty participants (age 17.0 ± 1.2 years, body mass 81.1 ± 3.4 kg, height 1.82± 0.07 m) performed a Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1), a squat (SJ) and a countermovement jump test (CMJ), as well as a repeated sprint ability test (RSA)...
November 16, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27834619/maturation-related-effect-of-low-dose-plyometric-training-on-performance-in-youth-hockey-players
#8
Jason Moran, Gavin R H Sandercock, Rodrigo Ramírez-Campillo, Oliver Todd, Collison, Dave A Parry
PURPOSE: The purpose of this intervention study was to investigate if a low-dose of plyometric training (PT) could improve sprint and jump performance in groups of different maturity status. METHODS: Male youth field hockey players were divided into Pre-PHV (from -1 to -1.9 from PHV; Experimental: n = 9; Control = 12) and Mid-PHV (0 to +0.9 from PHV; Experimental: n = 8; Control = 9) groups. Participants in the experimental groups completed 60 foot contacts, twice-weekly, for 6 weeks...
November 11, 2016: Pediatric Exercise Science
https://www.readbyqxmd.com/read/27813392/physical-and-physiological-differences-of-backs-and-forwards-from-the-brazilian-national-rugby-union-team
#9
Fábio Y Nakamura, Lucas A Pereira, José E Moraes, Ronaldo Kobal, Katia Kitamura, Cesar C Cal Abad, Luís M Teixeira Vaz, Irineu Loturco
BACKGROUND: The aim of this study was to compare backs and forwards rugby union players recruited to a National team in the following physical and physiological indicators: anthropometrics, squat jump (SJ), countermovement jump (CMJ), 10- and 30-m sprint, resting heart rate variability (HRV), Yo-Yo test and heart rate (HR) at 2-min of test. METHODS: The measurements were performed on the first day of a training camp planned to finely select the players who would participate in the 2016 America's Rugby Championship...
November 4, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27806006/using-the-split-squat-to-potentiate-bilateral-and-unilateral-jump-performance
#10
Chris Bishop, Joe Tarrant, Paul Jarvis, Anthony Turner
The purpose of this study was to examine if a split squat conditioning exercise with no or light loads could potentiate unilateral and bilateral jump performance. Twelve semi-professional rugby players (age: 22.3 ± 1.4 years; height: 1.84 ± 0.05 m, mass: 92.4 ± 9.6 kg) from the English National League 1 performed a series of unilateral and bilateral countermovement jumps (CMJ) and broad jumps (BJ) over the course of two testing days. Both testing days involved performing baseline jumps before completing two sets of ten repetitions of a split squat, this completed with either bodyweight (testing session 1) or a 30kg weighted vest (testing session 2)...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27803631/assessment-of-technical-skills-in-young-soccer-goalkeepers-reliability-and-validity-of-two-goalkeeper-specific-tests
#11
Ricardo Rebelo-Gonçalves, António J Figueiredo, Manuel J Coelho-E-Silva, Antonio Tessitore
The purpose of this study was to evaluate the reproducibility and validity of two new tests designed to examine goalkeeper-specific technique. Twenty-six goalkeepers (14.49 ± 2.52 years old) completed two trial sessions, each separated by one week, to evaluate the reproducibility of the Sprint-Keeper Test (S-Keeper) and the Lateral Shuffle-Keeper Test (LS-Keeper). Construct validity was assessed among forty goalkeepers (14.49 ± 1.71 years old) by competitive level (elite versus non-elite), after controlling for chronological age...
September 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27803628/improved-maximum-strength-vertical-jump-and-sprint-performance-after-8-weeks-of-jump-squat-training-with-individualized-loads
#12
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/27792219/the-role-of-lower-limbs-during-tennis-serve
#13
Filippo Dossena, Carlo Rossi, Antonio La Torre, Matteo Bonato
BACKGROUND: Tennis serve is the most important shot in tennis. Lower limbs generate about 50% of the total force developed during the serve, but limited information are available about their role. Therefore, the aim of the present study was to investigate the role of lower limbs during first and second serve and its relationship between jump height and ball speed during tennis serve. METHODS: Eight professional tennis players (age: 20±3 years; height 181±3 cm; height with racket: 283±5 cm; playing experience 13±3 years) were tested with counter movement jump (CMJ) and CMJ with free arm swing (CMJF)...
October 28, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27736310/effects-of-a-10-week-introductory-judo-course-on-postural-control-during-a-bilateral-reactionary-gripping-task
#14
Tyler W D Muddle, David H Fukuda, Ran Wang, Joshua J Riffe, David D Church, Kyle S Beyer, Jay R Hoffman, Jeffrey R Stout
This study examined the effect of a 10-week introductory judo course on postural control during a bilateral reactionary gripping task using varied stance conditions. Twenty volunteers were divided into experimental (JDO) or control (CON) groups. Countermovement jump (CMJ) was measured and center of pressure (COP) variables were evaluated while performing a bilateral reactionary gripping task under varied stance conditions during pre and post testing. No interactions were observed for the COP variables (p>0...
October 13, 2016: Motor Control
https://www.readbyqxmd.com/read/27736241/to-jump-or-cycle-monitoring-neuromuscular-function-in-rugby-union-players
#15
Gregory Roe, Joshua Darrall-Jones, Kevin Till, Padraic Phibbs, Dale Read, Jonathon Weakley, Ben Jones
PURPOSE: The purpose of this study was to evaluate changes in performance of a 6-second cycle ergometer test (CET) and countermovement jump (CMJ) during a 6-week training block in professional rugby union players. METHODS: Twelve young professional rugby union players performed two CET and CMJ on the first and fourth morning of every week prior to the commencement of daily training during a 6-week training block. Standardised changes in the highest score of two CET and CMJ efforts were assessed using linear mixed modelling and magnitude-based inferences...
October 13, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27735221/effects-of-muscle-fatigue-induced-by-cmj-on-efficacy-parameters-of-instep-ball-kicking-in-soccer
#16
Víctor Torreblanca-Martínez, Fernando M Otero-Saborido, José A González-Jurado
The purpose was to study the effects of muscle fatigue induced by countermovement jumps (CMJ) on instep kick foot velocity in young male soccer players. Fifteen under-18 soccer players of a professional club, performed maximal velocity instep kicks before and after a fatigue protocol that consisted of continuous CMJ (countermovement jump). Foot velocity at impact without fatigue, foot velocity at impact with fatigue, CMJ height without fatigue, maximum jump height in fatigue test, and CMJ height change in fatigue test on a dynamometric platform, were measured...
October 13, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27704484/effect-of-plyometric-training-on-vertical-jump-performance-in-female-athletes-a-systematic-review-and-meta-analysis
#17
Emilija Stojanović, Vladimir Ristić, Daniel Travis McMaster, Zoran Milanović
BACKGROUND: Plyometric training is an effective method to prevent knee injuries in female athletes; however, the effects of plyometric training on jump performance in female athletes is unclear. OBJECTIVE: The aim of this systematic review and meta-analysis was to determine the effectiveness of plyometric training on vertical jump (VJ) performance of amateur, collegiate and elite female athletes. METHODS: Six electronic databases were searched (PubMed, MEDLINE, ERIC, Google Scholar, SCIndex and ScienceDirect)...
October 4, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27691454/force-and-power-time-curve-comparison-during-jumping-between-strength-matched-male-and-female-basketball-players
#18
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/27663764/the-countermovement-jump-to-monitor-neuromuscular-status-a-meta-analysis
#19
João Gustavo Claudino, John Cronin, Bruno Mezêncio, Daniel Travis McMaster, Michael McGuigan, Valmor Tricoli, Alberto Carlos Amadio, Julio Cerca Serrão
OBJECTIVES: The primary objective of this meta-analysis was to compare countermovement jump (CMJ) performance in studies that reported the highest value as opposed to average value for the purposes of monitoring neuromuscular status (i.e., fatigue and supercompensation). The secondary aim was to determine the sensitivity of the dependent variables. DESIGN: Systematic review with meta-analysis. METHODS: The meta-analysis was conducted on the highest or average of a number of CMJ variables...
August 25, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27625755/comparison-of-mental-toughness-and-power-test-performances-in-high-level-kickboxers-by-competitive-success
#20
Maamer Slimani, Bianca Miarka, Walid Briki, Foued Cheour
BACKGROUND: Kickboxing is a high-intensity intermittent striking combat sport, which is characterized by complex skills and tactical key actions with short duration. OBJECTIVES: The present study compared and verified the relationship between mental toughness (MT), countermovement jump (CMJ) and medicine ball throw (MBT) power tests by outcomes of high-level kickboxers during National Championship. MATERIALS AND METHODS: Thirty two high-level male kickboxers (winner = 16 and loser = 16: 21...
June 2016: Asian Journal of Sports Medicine
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