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James Parker, Lina E Lundgren
The ability to analyse countermovement jump (CMJ) waveform data using statistical methods, like principal component analysis, can provide additional information regarding the different phases of the CMJ, compared to jump height or peak power alone. The aim of this study was to investigate the between-sport force-time curve differences in the CMJ. Eighteen high level golfers (male = 10, female = 8) and eighteen high level surfers (male = 10, female = 8) performed three separate countermovement jumps on a force platform...
December 8, 2018: Sports
Amador García-Ramos, Alejandro Pérez-Castilla, Slobodan Jaric
This study aimed to compare the reliability and validity of the force-velocity (F-V) relationship parameters obtained from two-point methods differing in the distance between experimental points, and to evaluate the acute change in unloaded jump height after a vertical jump testing procedure based on multiple loads. Totally, 18 men randomly performed two sessions of the squat jump (SJ) and two sessions of the countermovement jump (CMJ) exercises against five external loads (17, 30, 45, 60 and 75 kg). The unloaded jump height was evaluated before and after each testing procedure...
December 12, 2018: Sports Biomechanics
James R Broatch, David J Bishop, Emma K Zadow, Shona Halson
Broatch, JR, Bishop, DJ, Zadow, EK, and Halson, S. Effects of sports compression socks on performance, physiological, and hematological alterations after long-haul air travel in elite female volleyballers. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this investigation was to assess the merit of sports compression socks in minimizing travel-induced performance, physiological, and hematological alterations in elite female volleyball athletes. Twelve elite female volleyballers (age, 25 ± 2 years) traveled from Canberra (Australia) to Manila (Philippines), and were assigned to 1 of 2 conditions; compression socks (COMP, n = 6) worn during travel or a passive control (CON, n = 6)...
December 7, 2018: Journal of Strength and Conditioning Research
Mohamed Amine Bouzid, Kais Ghattassi, Wael Daab, Slim Zarzissi, Mustapha Bouchiba, Liwa Masmoudi, Hamdi Chtourou
The aim of the present study was to assess the effects of cold water immersion (CWI) after an intermittent test on the recovery kinetic of physical performance, muscle damage and perceived muscle soreness in professionals soccer players. In a randomized design, eight soccer players completed the Loughborough Intermittent Shuttle Test followed by 10 min of either CWI (10C°) or thermoneutral water immersion (TWI) (28C°). Physical performance (Squat jump: SJ, countermovement jump: CMJ, maximal voluntary contraction: MVC, and 20 m sprint: SP), muscle damage parameter (creatine kinase: CK) and perceived muscle soreness were assessed at baseline, 0 h, 24 h, 48 h and 72 h after the intermittent test...
December 2018: Journal of Thermal Biology
Meizhen Zhang, Moritz Schumann, Tao Huang, Timo Törmäkangas, Sulin Cheng
BACKGROUND: The primary aim of this study was to examine the associations of normal weight obesity (NWO) with physical fitness in Chinese university students. As a secondary aim, we assessed whether possible differences in physical fitness between students classified as NWO and normal weight non-obese (NWNO) were mediated by skeletal muscles mass. METHODS: A total of 383 students (205 males and 178 females, aged 18-24 years) from two universities volunteered to participate in this study...
December 4, 2018: BMC Public Health
Pantelis Theodoros Nikolaidis, Bruno Matos, Filipe Manuel Clemente, Pedro Bezerra, Miguel Camões, Thomas Rosemann, Beat Knechtle
The Wingate anaerobic test (WAnT) has been used extensively to evaluate performance in soccer, however, a comprehensive sport-specific normative database has not been available so far. Therefore, the main aim of the present study was to develop norms of the main indices of the WAnT with regards to age in soccer. A secondary aim was to examine the relationship of WAnT with two common field tests, 20 m sprint and vertical jump, and study the variation of this relationship by age and playing position. Hundred and ninety five male soccer players (age 18...
2018: Frontiers in Physiology
Paul T Morgan, Paola M Wollman, Sarah R Jackman, Joanna L Bowtell
(1) Background: Mucilage within cacao pods contains high levels of polyphenols. We investigated whether consumption of cacao juice enhances the recovery of muscle function following intensive knee extension exercise. (2) Methods: Ten recreationally active males completed two trials of 10 sets of 10 single leg knee extensions at ~80% one repetition maximum. Participants consumed each supplement (ZumoCacao® juice, CJ or a dextrose drink, PL) for 7 days prior to and 48 h post exercise. Knee extension maximum voluntary contraction (MVC) and a counter movement jump (CMJ) were performed at baseline, immediately, 24 h, and 48 h post-exercise...
November 28, 2018: Sports
Issam Makhlouf, Anis Chaouachi, Mehdi Chaouachi, Aymen Ben Othman, Urs Granacher, David G Behm
Introduction: Studies that combined balance and resistance training induced larger performance improvements compared with single mode training. Agility exercises contain more dynamic and sport-specific movements compared with balance training. Thus, the purpose of this study was to contrast the effects of combined balance and plyometric training with combined agility and plyometric training and an active control on physical fitness in youth. Methods: Fifty-seven male soccer players aged 10-12 years participated in an 8-week training program (2 × week)...
2018: Frontiers in Physiology
Minas A Mina, Anthony J Blazevich, Themistoklis Tsatalas, Giannis Giakas, Laurent B Seitz, Anthony D Kay
Studies examining acute, high-speed movement performance enhancement following intense muscular contractions (frequently called 'post-activation potentiation'; PAP) often impose a limited warm-up, compromizing external validity. In the present study the effects on countermovement vertical jump (CMJ) performance of back squat exercises performed with or without elastic bands during warm-up were compared. After familiarization, fifteen active men visited the laboratory on two occasions under randomized, counterbalanced experimental squat warm-up conditions: (1) free-weight resistance (FWR) and (2) variable resistance (VR)...
November 23, 2018: Scandinavian Journal of Medicine & Science in Sports
Jorge Arede, Rafael Vaz, Alberto Franceschi, Oliver Gonzalo-Skok, Nuno Leite
BACKGROUND: The aim of this study was to evaluate the effects of an in-season strength and conditioning program on physical abilities in under-16 sub-elite basketball players. METHODS: Sixteen young male basketball players were assessed using countermovement jump (CMJ), squat jump (SJ), 10-meters sprint and Pro Agility test, before and after an 8-week in-season strength and conditioning program. Both the control group (BASK; n = 7) and the experimental group (SC; n = 9) were involved in regular basketball practice; additionally, the SC group performed 4 sessions per week of training intervention considering post-match days and prior days to next match...
November 21, 2018: Journal of Sports Medicine and Physical Fitness
Angelos Vlahoyiannis, George Aphamis, Eleni Andreou, George Samoutis, Giorgos K Sakkas, Christoforos D Giannaki
The aim of the current study was to investigate the effect of the glycemic index of post-exercise meals on sleep quality and quantity, and assess whether those changes could affect the next day's exercise performance. Following a baseline/familiarization phase, 10 recreationally trained male volunteers (23.2 ± 1.8 years) underwent two double-blinded, randomized, counterbalanced crossover trials. In both trials, participants performed sprint interval training (SIT) in the evening. Post-exercise, participants consumed a meal with a high (HGI) or low (LGI) glycemic index...
November 18, 2018: Nutrients
Matthew J Jordan, Per Aagaard, Walter Herzog
Purpose: The aim of this study was to compare mechanical muscle function in the eccentric/concentric phases of vertical bilateral jumping in anterior cruciate ligament-reconstructed (ACLR), elite (ELITE), and adolescent (ADOL) alpine ski racers and ski cross athletes. Methods: Alpine ski racers/ski crossers (ACLR: n  = 12, age = 26.7 ± 3.8 years; ELITE: n  = 12, age = 23.9 ± 3.0 years; ADOL: n  = 12, age = 17.8 ± 0.7 years; females: n  = 6 per group, males: n  = 6 per group) performed 5 maximal countermovement jumps (CMJs) and 5 squat jumps...
October 2018: Journal of Sport and Health Science
Lisa Steidl-Müller, Carolin Hildebrandt, Erich Müller, Christian Fink, Christian Raschner
Purpose: The aims of this study were to assess differences of limb symmetry index (LSI) in strength- and coordination-related tasks between high-level, competitive, noninjured ski racers of different age-related performance levels and to prospectively assess limb differences as a possible risk factor for traumatic and overuse injury in youth ski racers. Methods: The study (Study 1) included 285 high-level competitive ski racers (125 females, 160 males) of 3 age-related performance levels and based on the school system: 95 youth (10-14 years, secondary modern school), 107 adolescent (15-19 years, grammar school), and 83 elite athletes (20-34 years)...
October 2018: Journal of Sport and Health Science
Jorge López-Fernández, Javier Sánchez-Sánchez, Sergio Rodríguez-Cañamero, Esther Ubago-Guisado, Enrique Colino, Leonor Gallardo
The aim of this research was to evaluate the influence of game surface and pitch size on the physiological responses, jump performance and perceptions of sub-elite female soccer players playing four-a-side games. Sixteen sub-elite female soccer players were divided into four groups of four players each. Three small-sided games (SSGs; pitch size: 400 m2 , 600 m2 and 800 m2 ) were played on three surfaces (dirt [DT], artificial turf [AT] and natural grass [NG]). Players' heart rate (HR) was monitored during each game...
September 2018: Biology of Sport
Dimitris Vlachopoulos, Alan R Barker, Esther Ubago-Guisado, Craig A Williams, Luis Gracia-Marco
This study demonstrates that a 9-month jumping intervention can improve bone mass gains and physical fitness performance in adolescent males participating in non-osteogenic sports, such as swimming and cycling. PURPOSE: To examine the effect of a jumping intervention on bone mass, bone stiffness and fitness parameters in adolescents involved in different sports. METHODS: Ninety-three adolescent male swimmers (SWI), footballers (FOO) and cyclists (CYC) were randomised to intervention (INT) and sport (INT-SWI = 19, INT-FOO = 15, INT-CYC = 14) or sport only (CON-SWI = 18, CON-FOO = 15, CON-CYC = 12) groups...
November 17, 2018: Archives of Osteoporosis
Irineu Loturco, Ian Jeffreys, Ronaldo Kobal, César C Cal Abad, Rodrigo Ramirez-Campillo, Vinicius Zanetti, Lucas A Pereira, Fábio Y Nakamura
This study aimed to compare vertical jump ability (squat-jump [SJ] and countermovement-jump [CMJ]), relative to body mass mean propulsive power in the jump-squat (MPP-REL JS), and the 0-5, 5-10, and 10-20 m acceleration and speed among soccer players from the same professional club, divided into age-categories (U15 [n = 20], U17 [n = 53], U20 [n = 22] and senior [n = 25] players). The tests were performed at the start of the preseason in indoor facilities. The magnitude-based inference approach and the standardized differences (based on effect sizes) were used to compare the age-groups...
September 2018: Journal of Human Kinetics
Guillermo Peña García-Orea, Noelia Belando-Pedreño, Juan Andrés Merino-Barrero, Abel Jiménez-Ruiz, Juan Ramón Heredia-Elvar
The purpose of this study was to analyse the reliability and validity of an opto-electronic sensor system (Velowin) compared to a linear velocity transducer (T-Force System) considered as the gold standard. Mean velocity (MV) and peak velocity (PV) generated in the Smith machine bar placed on the shoulders in counter-movement jump exercise (CMJ) were analysed. The study was conducted with a sample of 21 men with experience in resistance training. Five measurements were analysed for CMJ exercise in concentric phase using a progressive loading increase...
November 14, 2018: Sports Biomechanics
Joel Garrett, Stuart R Graham, Roger G Eston, Darren J Burgess, Lachlan J Garrett, John Jakeman, Kevin Norton
PURPOSE: To compare the sensitivity of a submaximal run test (SRT) with a countermovement jump (CMJ) test to provide an alternate method of measuring neuromuscular fatigue (NMF) in high performance sport. METHODS: 23 professional and semi-professional Australian rules football (ARF) players, performed a SRT and CMJ test, pre-match, 48- and 96-hours post-match. Variables from accelerometers recorded during the SRT were; player load 1D up (PL1Dup ) (vertical vector); player load 1D side (PL1Dside ) (medio-lateral vector); and player load 1D forward (PL1Dfwd ) (anterio-posterior vector)...
November 14, 2018: International Journal of Sports Physiology and Performance
Filipe Manuel Clemente, Daniele Conte, Rita Sanches, Carlos Filipe Moleiro, Mónica Gomes, Ricardo Lima
The purpose of this study was to analyze the relationships between anthropometric (height and weight), fitness status (aerobic capacity, Yo-Yo Intermittent Recovery Test - level 1, YYIRT-L1; countermovement jump performance, CMJ) and perceived exertion (RPE) of twenty youth (under-14 and under-16) male basketball players and their technical actions (attacking balls-AB, shots-S, received balls-RB, rebounds-R, conquered balls-CB, lost balls-LB) during five small-sided games (SSGs) formats (from 1v1 to 5v5). Pearson's product-moment correlation coefficients tested the relationships between the anthropometric and fitness variables and the technical actions and perceived exertion during SSGs...
November 11, 2018: Research in Sports Medicine
Hamdi Chtourou, Florian Azad Engel, Hassen Fakhfakh, Hazem Fakhfakh, Omar Hammouda, Achraf Ammar, Khaled Trabelsi, Nizar Souissi, Billy Sperlich
Objectives: The aim of this study was to examine the effect of time of day on short-term repetitive maximal performance and psychological variables in elite judo athletes. Methods: Fourteen Tunisian elite male judokas (age: 21 ± 1 years, height:172 ± 7 cm, body-mass: 70.0 ± 8.1 kg) performed a repeated shuttle sprint and jump ability (RSSJA) test (6 m × 2 m × 12.5 m every 25-s incorporating one countermovement jump (CMJ) between sprints) in the morning (7:00 a.m.) and afternoon (5:00 p.m.). Psychological variables (Profile of mood states (POMS-f) and Hooper questionnaires) were assessed before and ratings of perceived exertion (RPE) immediately after the RSSJA...
2018: Frontiers in Physiology
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