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Journal of Sports Science & Medicine

Mehdi Chlif, David Keochkerian, Abdou Temfemo, Dominique Choquet, Said Ahmaidi
The inspiratory muscle tension-time index TT0.1 (given by P0.1 /PImax x TI /TTOT ) could be used to reliably assess inspiratory muscle activity during exercise. So far, the correlation between the TT0.1 and diaphragmatic activity has not been measured and the TT0.1 has not been compared with other measurements of the inspiratory muscle load such as the transdiaphragmatic pressure index or TT di . In this study we hypothesize that the TT0.1 measuring the mouth is a noninvasive reflection of the electromyographic activity of the diaphragm...
September 2018: Journal of Sports Science & Medicine
Athanasios Z Jamurtas, Ioannis G Fatouros, Chariklia K Deli, Kalliopi Georgakouli, Athanasios Poulios, Dimitrios Draganidis, Konstantinos Papanikolaou, Panagiotis Tsimeas, Athanasios Chatzinikolaou, Alexandra Avloniti, Athanasios Tsiokanos, Yiannis Koutedakis
A single bout of exercise can result in inflammatory responses, increased oxidative stress and upregulation of enzymatic antioxidant mechanisms. Although low-volume high-intensity interval training (HIIT) has become popular, its acute responses on the above mechanisms have not been adequately studied. The present study evaluated the effects of HIIT on hematological profile and redox status compared with those following traditional continuous aerobic exercise (CET). Twelve healthy young men participated in a randomized crossover design under HIIT and CET...
September 2018: Journal of Sports Science & Medicine
Hee Seong Joeng, Young Moo Na, Sae Yong Lee, Young Jae Cho
This study aims to analyze the incidence, location, type, and mechanisms of injuries and possible injury risk factors among all levels of Korean female professional golfers. This was a prospective study with a follow-up period of 24 months. A total of 363 members of the Korean Ladies Professional Golf Association (KLPGA), who competed in tournaments during the 2015 and 2016 seasons, took part in the study. The incidence of injury varied by tournament level and was significantly higher in Division II (11.1/1000AEs) and Division III (13...
September 2018: Journal of Sports Science & Medicine
Tessa Maroni, Brian Dawson, Myles Dennis, Louise Naylor, Carly Brade, Karen Wallman
This study aimed to assess the separate and combined effects of a cooling glove (CG) and a gel-cooling jacket (CJ) used during a half-time break on manual dexterity performance (Purdue Pegboard test) and subsequent repeat-sprint cycling performance in hot conditions. Twelve male athletes performed four experimental trials (within subjects, counterbalanced design) that consisted of: wearing a CG, wearing a CJ, combination of CG and CJ (CG+J) or a no-cooling control (NC) for 15 min during a 20 min half-time break performed between 2 x 30 min repeated-sprint cycling bouts in heat (35...
September 2018: Journal of Sports Science & Medicine
Oliver Ochentel, Crystal Humphrey, Klaus Pfeifer
An increasing amount of scientific work suggests positive effects of exercise-related interventions in patients with burnout. Exercise therapy could therefore be a useful intervention procedure in the treatment of burnout. The aim of this meta-analysis is to examine empirical findings for exercise therapy used to treat burnout in the occupational setting, including the variety of the application and variety of the exercise modality itself. Electronic databases (PubMed, Cochrane Library, Scopus, PubPsych, PsycInfo) were searched (January 2018) for randomized controlled trials reporting on exercise therapy intervention studies in persons with burnout...
September 2018: Journal of Sports Science & Medicine
Norman Helm, Olaf Prieske, Thomas Muehlbauer, Tom Krüger, Helmi Chaabene, Urs Granacher
Our experimental approach included two studies to determine discriminative validity and test-retest reliability (study 1) as well as ecological validity (study 2) of a judo ergometer system while performing judo-specific movements. Sixteen elite (age: 23 ± 3 years) and 11 sub-elite (age: 16 ± 1 years) athletes participated in study 1 and 14 male sub-elite judo athletes participated in study 2. Discriminative validity and test-retest reliability of sport-specific parameters (mechanical work, maximal force) were assessed during pulling movements with and without tsukuri ( kuzushi )...
September 2018: Journal of Sports Science & Medicine
Mohammed A Hammami, Abderraouf Ben Abderrahman, Fatma Rhibi, Ammar Nebigh, Sullivan Coppalle, Guillaume Ravé, Zouhair Tabka, Hassane Zouhal
The effect of two soccer-training seasons on the growth, development and somatotype hormone concentrations of elite youth soccer players were evaluated. Eighteen elite soccer players and 18 age-matched non-athletic control subjects participated in the study. Anthropometric-measurements, aerobic and anaerobic performance tests and serum concentrations of insulin-like growth factor-1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3), and growth hormone (GH) were assessed at 5 time points across two competitive seasons...
September 2018: Journal of Sports Science & Medicine
Sihyun Yoo, Sang-Kyoon Park, Sukhoon Yoon, Hee Sung Lim, Jiseon Ryu
Maintaining balance while performing "Hakdariseogi" in Taekwondo, which involves standing on one leg, is a critical aspect of the Poomsae competition. The purpose of this study was to investigate the effect of proprioceptive training and lower-limb muscular strength training on the balance of Taekwondo Poomsae athletes over a 6-week period. Thirty Taekwondo Poomsae athletes were randomly assigned to three groups, namely, a proprioception training group, a lower-limb muscular strength training group, and a control group...
September 2018: Journal of Sports Science & Medicine
Wei-Ting Hsu, Yi-Hsiang Pan
This study examined how mechanisms of moral disengagement (MD) were related to students' self-reported misbehaviors. Participants were 282 and 336 high school students enrolled in physical education classes. In Stage 1, results of regression analysis showed that advantageous comparison and non-responsibility positively predicted four misbehaviors (i.e., low engagement, failure to follow directions, poor self-management, and distracting behavior). In Stage 2, results of the structural equation modeling confirmed that advantageous comparison and non-responsibility were the significant predictors of student misbehavior in physical education...
September 2018: Journal of Sports Science & Medicine
Elisabet Guillamó, Álvaro Cobo-Calvo, Guillermo R Oviedo, Noémie Travier, Juan Álamo, Oscar A Niño-Mendez, Antonio Martínez-Yelamos, Sergio Martínez-Yelamos, Casimiro Javierre
Multiple sclerosis (MS) is a chronic neurological disease which affects young adults at a time of maximum personal, professional and social growth. Recent guidelines on physical activity have established that exercise is an essential component of the clinical management of people with MS with mild or moderate degree of disability. The main purpose of this study was to test the feasibility and the effects of two different 40-week structured physical exercise interventions (a supervised high intensity interval training plus home exercise program and a self-applied home-based exercise program) on clinical evolution, psychological wellbeing, quality of life, fatigue, cardiorespiratory fitness, strength and balance of people with MS...
September 2018: Journal of Sports Science & Medicine
Mitchell Naughton, Joanna Miller, Gary J Slater
The implications of impact-induced muscle damage (IIMD) that results from participation in contact-sport are not well understood. The purpose of the present study was to implement a novel method of generating IIMD and characterise the implications of this on perceptual, biochemical and exercise performance parameters. Eighteen male recreational contact-sport athletes completed a single-group time series with measures assessed at baseline (PRE) and immediately following (POST) an IIMD protocol, with repeat testing 24, 48, and 72 h following the IIMD protocol...
September 2018: Journal of Sports Science & Medicine
José M Yagüe, Alfonso de la Rubia, Joaquín Sánchez-Molina, Sergio Maroto-Izquierdo, Olga Molinero
The aim of the present research was to observe the relative age effect on professional soccer players of the ten best leagues of the Union of European Football Associations (UEFA), according to the IFFHS (International Federation of Football History and Statistics). The sample consisted of 5201 professional players who participated in the professional leagues during the 2016-2017 season. The birth date of each player was classified in four quartiles (Q1, Q2, Q3 and Q4). The frequencies (fr) and percentages (%) of the birth quartiles were analyzed...
September 2018: Journal of Sports Science & Medicine
Sean Williams, Stephen West, Dan Howells, Simon P T Kemp, Andrew A Flatt, Keith Stokes
A systems modelling approach can be used to describe and optimise responses to training stimuli within individuals. However, the requirement for regular maximal performance testing has precluded the widespread implementation of such modelling approaches in team-sport settings. Heart rate variability (HRV) can be used to measure an athlete's adaptation to training load, without disrupting the training process. As such, the aim of the current study was to assess whether chronic HRV responses, as a representative marker of training adaptation, could be predicted from the training loads undertaken by elite Rugby Sevens players...
September 2018: Journal of Sports Science & Medicine
Rafael Heiss, Thilo Hotfiel, Marion Kellermann, Matthias S May, Wolfgang Wuest, Rolf Janka, Armin M Nagel, Michael Uder, Matthias Hammon
Delayed-onset muscle soreness (DOMS), an ultrastructural muscle injury, is one of the most common reasons for impaired muscle performance. The purpose of this study was to investigate the influence of sport compression garments on the development of exercise-induced intramuscular edema in the context of DOMS. DOMS was induced in 15 healthy participants. The participants performed a standardized eccentric exercise of the calf muscles. Magnetic resonance imaging (MRI) was performed at baseline and 60h after exercise (T2-weighted signal intensity and T2 relaxation time was evaluated in each compartment and the intramuscular edema in the medial head of the gastrocnemius muscle was segmented)...
September 2018: Journal of Sports Science & Medicine
Marcos R T P Menuchi, Antônio R P Moro, Paulo E Ambrósio, César A B Pariente, Duarte Araújo
Although there are several descriptions of interpersonal coordination in soccer teams, little is known about how such coordination is influenced by space and time constraints. In this study, we analyzed variations in interpersonal coordination under different marking intensities and across different age groups. Marking intensity was manipulated by changing the players' game space and time of ball possession in a conditioned soccer game known as rondo . Five participants in each age category (U13, U15, U17, and U20) performed rondo tasks in four experimental conditions, in a total of 134 trials...
September 2018: Journal of Sports Science & Medicine
Sebastian Hernández, Rodrigo Ramirez-Campillo, Cristian Álvarez, Javier Sanchez-Sanchez, Jason Moran, Lucas A Pereira, Irineu Loturco
The aim of this single-blind randomized controlled trial was to compare the effects of plyometric jump training (PJT), with (RG) and without (NRG) between-session drill randomization, on performance measures (i.e., jumping and sprinting abilities, change of direction speed, and technical performance) in youth male basketball players (age, 10.2 ± 1.7 years), assigned to either the NRG (n = 7), RG (n = 6), or control group (n = 6). Before and after the intervention, countermovement jump, 20-cm drop jump, 30-m sprint (with or without ball dribbling), and change-of-direction speed tests were completed...
September 2018: Journal of Sports Science & Medicine
David Casamichana, Esther Morencos, Blanca Romero-Moraleda, Tim J Gabbett
The current study compared the running demands of professional field hockey players using individualized speed zones and generic default settings of the GPS manufacturer. In addition, the differences in slow, moderate and fast players were studied. Sixteen male players from the same club participated in the study (age: 25.5 ± 2.9 years; body mass: 74.6 ± 5.5 kg; stature 1.77 ± 0.05 m). The peak speed of each participant was established at the end of the data collection period by analyzing all training and playing data throughout the season...
September 2018: Journal of Sports Science & Medicine
Olivier Girard, Grégoire P Millet, Athol Thomson, Franck Brocherie
We compared fatigue-induced changes in plantar loading during the repeated anaerobic sprint test over two distinct distance intervals. Twelve international male football outfield players (Qatar Football Association) completed 6 × 35-m sprints (10 s of active recovery) on artificial turf with their football boots. Insole plantar pressure distribution was continuously recorded and values (whole foot and under 9 foot zones) subsequently averaged and compared over two distinct distance intervals (0-17.5 m vs ...
September 2018: Journal of Sports Science & Medicine
Ioannis N Kostikiadis, Spyridon Methenitis, Athanasios Tsoukos, Panagiotis Veligekas, Gerasimos Terzis, Gregory C Bogdanis
The purpose of the present study was to investigate the effect of a short-term, high-intensity, low-volume Mixed Martial Arts (MMA) specific strength and conditioning training program on performance in national level MMA athletes. Seventeen experienced fighters were divided into two groups: (A) Specific Training Group (STG; n = 10), which followed a specific strength and conditioning program designed according to the demands of MMA competition and (B) Regular Training Group (RTG; n = 7), in which participants followed a regular strength and conditioning program commonly used by MMA athletes...
September 2018: Journal of Sports Science & Medicine
Hannes Gatterer, Verena Menz, Eduardo Salazar-Martinez, Zuzana Sumbalova, Luiz Felipe Garcia-Souza, Beáta Velika, Erich Gnaiger, Martin Burtscher
This study aimed to investigate and compare the effects of repeated-sprint (RSH) and sprint interval training in hypoxia (SIH) on sea level running and cycling performance, and to elucidate potential common or divergent adaptations of muscle perfusion and -oxygenation as well as mitochondrial respiration of blood cells. Eleven team-sport athletes performed either RSH (3x5x10s, 20s and 5min recovery between repetitions and sets) or SIH (4x30s, 5min recovery) cycling training for 3weeks (3 times/week) at a simulated altitude of 2,200m...
September 2018: Journal of Sports Science & Medicine
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