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https://www.readbyqxmd.com/read/29793108/manganese-contamination-affects-the-motor-performance-of-wild-northern-quolls-dasyurus-hallucatus
#1
Ami Fadhillah Amir Abdul Nasir, Skye F Cameron, Amanda C Niehaus, Christofer J Clemente, Frank A von Hippel, Robbie S Wilson
Neuromotor deficits are an important sign of manganese (Mn) toxicity in humans and laboratory animals. However, the impacts of Mn exposure on the motor function of wild animals remains largely unknown. Here, we assessed the impact of chronic exposure to Mn from active mining operations on Groote Eylandt, Australia on the motor function of the semi-arboreal northern quoll (Dasyurus hallucatus), an endangered species. The three motor tests conducted-maximum sprint speed on a straight run, manoeuvrability around a corner, and motor control on a balance beam-showed that elevated Mn body burden did not diminish performance of these traits...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29791970/effect-of-high-intensity-resistance-circuit-based-training-in-hypoxia-on-aerobic-performance-and-repeat-sprint-ability
#2
Domingo J Ramos-Campo, Ismael Martínez-Guardado, Guillermo Olcina, Cristian Marín-Pagán, Francisco J Martínez-Noguera, Jorge Carlos-Vivas, Pedro E Alcaraz, Jacobo A Rubio-Arias
Recent acute studies have shown that high-intensity resistance circuit-based (HRC) training in hypoxia increases metabolic stress. However, no intervention studies have yet proven their effectiveness. This study aimed to analyse the effect of 8 weeks of HRC in hypoxia on aerobic performance, resting energy expenditure (REE), repeat sprint ability (RSA) and haematological variables. Twenty-eight subjects were assigned to hypoxia (FiO2 =15%; HRChyp : n=15; age: 24.6±6.8 years; height: 177.4±5.9 cm; weight: 74...
May 23, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29786632/influences-of-playing-position-and-quality-of-opposition-on-standardized-relative-distance-covered-in-domestic-women-s-field-hockey-implications-for-coaches
#3
Don Vinson, Nicola Gerrett, David V B James
Vinson, D, Gerrett, N, and James, DVB. Influences of playing position and quality of opposition on standardized relative distance covered in domestic women's field hockey: Implications for coaches. J Strength Cond Res 32(6): 1770-1777, 2018-The purpose of this study was to compare the standardized relative distance covered by the various playing positions (defenders, midfielders, and forwards) against different quality of opponents in domestic women's field hockey. Data were collected from 13 individuals competing for 1 team in the English Premier League across an 18-game season...
June 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29769830/low-external-workloads-are-related-to-higher-injury-risk-in-professional-male-basketball-games
#4
Toni Caparrós, Martí Casals, Álvaro Solana, Javier Peña
The primary purpose of this study was to identify potential risk factors for sports injuries in professional basketball. An observational retrospective cohort study involving a male professional basketball team, using game tracking data was conducted during three consecutive seasons. Thirty-three professional basketball players took part in this study. A total of 29 time-loss injuries were recorded during regular season games, accounting for 244 total missed games with a mean of 16.26 ± 15.21 per player and season...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29764612/the-effect-of-a-novel-square-profile-hand-rim-on-propulsion-technique-of-wheelchair-tennis-players
#5
Sonja de Groot, Femke Bos, Jorine Koopman, Aldo E Hoekstra, Riemer J K Vegter
The purpose of this study was to investigate the effect of a square-profile hand rim (SPR) on propulsion technique of wheelchair tennis players. Eight experienced wheelchair tennis players performed two sets of three submaximal exercise tests and six sprint tests on a wheelchair ergometer, once with a regular rim (RR) and once with a SPR. Torque and velocity were measured continuously and power output and timing variables were calculated. No significant differences were found in propulsion technique between the RR and SPR during the submaximal tests...
September 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29742748/planning-training-workload-in-football-using-small-sided-games-density
#6
Sebastien Sangnier, Thierry Cotte, Olivier Brachet, Jeremy Coquart, Claire Tourny
Sangnier, S, Cotte, T, Brachet, O, Coquart, J, and Tourny, C. Planning training workload in football using small-sided games density. J Strength Cond Res XX(X): 000-000, 2018-To develop the physical qualities, the small-sided games' (SSGs) density may be essential in soccer. Small-sided games are games in which the pitch size, players' number, and rules are different to those for traditional soccer matches. The purpose was to assess the relation between training workload and SSGs' density. The 33 densities data (41 practice games and 3 full games) were analyzed through global positioning system (GPS) data collected from 25 professional soccer players (80...
May 8, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29740560/comparison-of-technical-and-physical-activities-between-8-vs-8-and-11-vs-11-games-in-young-korean-soccer-players
#7
Seong Hwan Oh, Chang Hwa Joo
The aims of this study were to examine the differences in technical aspects and physical demands between small-size games (SSG; 8 vs. 8) and regular-size games (RSG; 11 vs. 11) in young Korean soccer players. Seventy-nine young soccer players from 6 teams (U-12) volunteered to participate in the study. The players completed 4 games (2 SSG, 62×51 m, and 2 RSG, 80×54 m) in 2 days. Each game was filmed to evaluate technical actions. Physical demand variables were measured using global positioning system technology...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29727016/metabolic-stress-dependent-regulation-of-the-mitochondrial-biogenic-molecular-response-to-high-intensity-exercise-in-human-skeletal-muscle
#8
M Fiorenza, T P Gunnarsson, M Hostrup, F M Iaia, F Schena, H Pilegaard, J Bangsbo
KEY POINTS: Low-volume high-intensity exercise training promotes muscle mitochondrial adaptations that resemble the ones associated with high-volume moderate-intensity exercise training. These training-induced mitochondrial adaptations stem from the cumulative effects of transient transcriptional responses to each acute exercise bout. However, whether metabolic stress is a key mediator of the acute molecular responses to high-intensity exercise is still incompletely understood. Herein we show that, by comparing different work-matched low-volume high-intensity exercise protocols, more marked metabolic perturbations were associated with enhanced mitochondrial biogenesis-related muscle mRNA responses...
May 4, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29723200/longitudinal-motor-performance-development-in-early-adolescence-and-its-relationship-to-adult-success-an-8-year-prospective-study-of-highly-talented-soccer-players
#9
Daniel Leyhr, Augustin Kelava, Johannes Raabe, Oliver Höner
Several talent identification and development (TID) programs in soccer have implemented diagnostics to measure players' motor performance. Yet, there is a lack of research investigating the relationship between motor development in adolescence and future, adult performance. This longitudinal study analyzed the three-year development of highly talented young soccer players' speed abilities and technical skills and examined the relevance of this development to their adult success. The current research sample consisted of N = 1,134 players born between 1993 and 1995 who were selected for the German Soccer Association's TID program and participated in nationwide motor diagnostics (sprinting, agility, dribbling, ball control, shooting) four times between the Under 12 (U12) and Under 15 (U15) age class...
2018: PloS One
https://www.readbyqxmd.com/read/29708477/dribble-deficit-a-novel-method-to-measure-dribbling-speed-independent-of-sprinting-speed-in-basketball-players
#10
Aaron T Scanlan, Neal Wen, Tania Spiteri, Zoran Milanović, Daniele Conte, Joshua H Guy, Anne Delextrat, Vincent J Dalbo
Basketball tests assessing dribbling speed predicated on total performance times are influenced by sprinting speed. This study examines an approach termed Dribble Deficit to counter this limitation by examining the relationships between sprinting and dribbling speed during linear and change-of-direction (COD) tasks measured using total performance time and Dribble Deficit. Ten semi-professional basketball players completed linear sprints and COD sprints with and without dribbling. Dribble Deficit was calculated as the difference between the best time for each dribbling trial and corresponding non-dribbling trial for linear and COD sprints...
April 30, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29702520/relationship-between-selected-physical-qualities-bowling-kinematics-and-pace-bowling-skill-in-club-standard-cricketers
#11
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/29702518/team-dynamics-running-and-skill-related-performances-of-brazilian-u11-to-professional-soccer-players-during-official-matches
#12
Luiz H Palucci Vieira, Rodrigo Aquino, Felipe A Moura, Ricardo M L de Barros, Vitor M Arpini, Lucas P Oliveira, Bruno L S Bedo, Paulo R P Santiago
Palucci Vieira, LH, Aquino, R, Moura, FA, Barros, RMLd, Arpini, VM, Oliveira, LdP, Bedo, BLdS, and Pereira Santiago, PR. Team dynamics, running, and skill-related performances of Brazilian U11 to professional soccer players during official matches. J Strength Cond Res XX(X): 000-000, 2018-Analyses of movements during soccer competition have been used previously to help develop conditioning programs. However, this has not been extensively studied in youth populations. Therefore, the purposes of this study were to examine (1) dynamics of collective tactical movements, (2) running, and (3) skill-related performances during soccer matches disputed by children to senior players...
April 26, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29702517/assessing-repeated-sprint-ability-in-division-i-collegiate-women-soccer-players
#13
Robert G Lockie, Tricia M Liu, Alyssa A Stage, Adrina Lazar, Dominic V Giuliano, Jillian M Hurley, Ibett A Torne, Megan D Beiley, Samantha A Birmingham-Babauta, John J Stokes, Fabrice G Risso, DeShaun L Davis, Matthew R Moreno, Ashley J Orjalo
Lockie, RG, Liu, TM, Stage, AA, Lazar, A, Giuliano, DV, Hurley, JM, Torne, IA, Beiley, MD, Birmingham-Babauta, SA, Stokes, JJ, Risso, FG, Davis, DL, Moreno, MR, and Orjalo, AJ. Assessing repeated-sprint ability in Division I collegiate women soccer players. J Strength Cond Res XX(X): 000-000, 2018-Repeated-sprint ability (RSA) is a key component of soccer, and is the capacity to repeatedly produce near-maximal to maximal sprints with short recovery periods. Repeated-sprint ability has received little analysis in collegiate women soccer players...
April 26, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29698994/validity-of-a-basketball-specific-complex-test-in-female-professional-players
#14
René Schwesig, Souhail Hermassi, Andreas Lauenroth, Kevin Laudner, Alexander Koke, Thomas Bartels, Stefan Delank, Stephan Schulze
The purpose of this study was to assess the validity of a new basketball-specific complex test (BBCT) based on the ascertained match performance.Fourteen female professional basketball players (ages: 23.4 ± 1.8 years) performed the BBCT and a treadmill test (TT) at the beginning of pre-season training. Lactate, heart rate (HR), time, shooting precision and number of errors were measured during the four test sequences of the BBCT (short distance sprinting with direction changes, with and without a ball; fast break; lay-up parcours; sprint endurance test)...
April 26, 2018: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/29687744/differences-in-spatiotemporal-parameters-during-200-m-sprint-between-bilateral-and-unilateral-transfemoral-amputees
#15
Hiroaki Hobara, Sakiko Saito, Satoru Hashizume, Yuta Namiki, Yoshiyuki Kobayashi
BACKGROUND AND AIM: Although Paralympic T42 class Men's 200 m sprints are currently competed by athletes with bilateral and unilateral transfemoral amputations, there may be performance differences between the groups. This study aimed to compare the spatiotemporal parameters of a 200-m sprint between bilateral and unilateral transfemoral amputees wearing running-specific prostheses. TECHNIQUE: We analyzed 29 races (nine sprinters) with bilateral or unilateral transfemoral amputations from publicly available Internet broadcasts...
April 1, 2018: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29651862/four-weeks-of-%C3%AE-alanine-supplementation-improves-high-intensity-game-activities-in-water-polo
#16
Gabriel Motta Pinheiro Brisola, Elvis de Souza Malta, Paulo Roberto Pereira Santiago, Luiz Henrique Palucci Vieira, Alessandro Moura Zagatto
OBJECTIVES: The present study aimed to investigate whether four weeks of β-alanine supplementation improves total distance covered, distance covered and time spent in different speed zones, and sprint numbers during a simulated water polo game. DESIGN: The study design was double-blind, parallel and placebo controlled. Eleven male water polo players participated in the study, divided randomly into two homogeneous groups (placebo and β-alanine groups). METHODS: The participants performed a simulated water polo game before and after the supplementation period (4 weeks)...
April 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29599873/physical-performance-comparison-between-under-15-elite-and-sub-elite-soccer-players
#17
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/29599871/effects-of-different-post-activation-potentiation-warm-ups-on-repeated-sprint-ability-in-soccer-players-from-different-competitive-levels
#18
Javier Sanchez-Sanchez, Alejandro Rodriguez, Cristina Petisco, Rodrigo Ramirez-Campillo, Cristian Martínez, Fábio Y Nakamura
This study aimed to compare the effects of a traditional warm-up with two post-activation potentiation (PAP) warm-up strategies on the repeated sprint ability (RSA) of soccer players from national (NL) and regional (RL) competitive levels. Sixteen young players (NL, n = 8, age = 20.7 ± 1.4 y, body mass = 68.5 ± 7.0 kg, body height = 177.4 ± 5.2 cm; RL, n = 8, age = 20.8 ± 1.0 y, body mass = 68.7 ± 4.0 kg, body height = 176.6 ± 5.6 cm) were recruited to complete a traditional warm-up (CONTROL), a PAP warm-up incorporating squats with a load (~60% 1RM) that allowed a high speed (1 m/s) of movement and a high number of repetitions (PAP-1), and a PAP warm-up with a load (~90% 1RM) that allowed a moderate speed (0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29594355/high-intensity-intermittent-5-10-15-running-reduces-body-fat-and-increases-lean-body-mass-bone-mineral-density-and-performance-in-untrained-subjects
#19
Tanja Ravnholt, Jonas Tybirk, Niklas Rye Jørgensen, Jens Bangsbo
The present study examined the effect of intense intermittent running with 5 s sprints on body composition, fitness level, and performance in untrained subjects aged 36-53 years. For 7 weeks, the subjects carried out 3 days a week 5-10-15 training consisting of 3-9 blocks of 4 repetitions of 15, 10, and 5 s low-, moderate-, and high-speed running, respectively. Body fat mass was 4.3% lower (P < 0.01), and lean body mass and bone mineral density was 1.1 and 0.9% higher (P < 0.01), respectively, after compared to before the intervention period (INT)...
March 29, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29578385/comparison-of-step-by-step-kinematics-of-resisted-assisted-and-unloaded-20-m-sprint-runs
#20
Roland van den Tillaar, Paul Gamble
This investigation examined step-by-step kinematics of sprint running acceleration. Using a randomised counterbalanced approach, 37 female team handball players (age 17.8 ± 1.6 years, body mass 69.6 ± 9.1 kg, height 1.74 ± 0.06 m) performed resisted, assisted and unloaded 20-m sprints within a single session. 20-m sprint times and step velocity, as well as step length, step frequency, contact and flight times of each step were evaluated for each condition with a laser gun and an infrared mat. Almost all measured parameters were altered for each step under the resisted and assisted sprint conditions (η2  ≥ 0...
March 26, 2018: Sports Biomechanics
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