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https://www.readbyqxmd.com/read/29140147/sprint-running-performance-and-technique-changes-in-athletes-during-periodized-training-an-elite-training-group-case-study
#1
Ian N Bezodis, David G Kerwin, Stephen-Mark Cooper, Aki I T Salo
PURPOSE: To understand how training periodization influences sprint performance and key step characteristics over an extended training period in an elite sprint training group. METHODS: Four sprinters were studied during five months of training. Step velocities, step lengths and step frequencies were measured from video of the maximum velocity phase of training sprints. Bootstrapped mean values were calculated for each athlete for each session and 139 within-athlete, between-session comparisons were made with a repeated measures ANOVA...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29132264/leg-amputation-side-determines-performance-in-curve-sprinting-a-case-study-on-a-paralympic-medalist
#2
Johannes Funken, Kai Heinrich, Steffen Willwacher, Ralf Müller, Jonas Böcker, Hiroaki Hobara, Gert-Peter Brüggemann, Wolfgang Potthast
The lower limb kinetics of curve sprinting in amputees are not well described in the literature, particularly with respect to the effect of the side of amputation. This is an issue due to the importance of the knowledge for prosthetic design and classification of athletes. Thus, the aim of this study was to investigate the influence of side of amputation on curve sprinting performance in athletes with a unilateral leg amputation. A three-dimensional motion analysis system (Vicon), four force plates (Kistler) and a modified mathematical human model (ALASKA) were used to compare clockwise and counter clockwise curve sprinting lower limb kinematics and kinetics of a Paralympic medalist with a left-sided knee exarticular amputation...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29120989/validity-and-reliability-of-a-new-test-of-planned-agility-in-elite-taekwondo-athletes
#3
Helmi Chaabene, Yassine Negra, Laura Capranica, Raja Bouguezzi, Younés Hachana, Mohamed Ali Rouahi, Bessem Mkaouer
This study aimed to examine the validity, reliability, and sensitivity of a new test of planned agility in elite taekwondo athletes and to establish its relationship with sprint-time, jumping ability, and dynamic balance. Twenty-seven (20 males and 7 females) taekwondo athletes participated to this study. They performed taekwondo-specific agility test (TSAT) in two occasions (i.e., test-retest). Additionally, they performed jumping ability (i.e., squat jump, countermovement jump, standing long jump, and three-hop jump), sprint-time (5-m and 20-m dash), and dynamic balance (i...
November 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29120695/hypoxia-and-sprint-swimming-performance-of-juvenile-striped-bass-morone-saxatilis
#4
Krista Kraskura, Jay A Nelson
Annual hypoxia in the Chesapeake Bay has expanded to the point where Darwinian fitness of juvenile striped bass (Morone saxatilis) may depend on their ability to perform in low-oxygen environments. The locomotion they use in predator/prey dynamics relies primarily on white (type II) muscle that is powered by anaerobic metabolic pathways and has generally been thought to be immune to aquatic hypoxia. We tested the sprint performance of 15 juvenile striped bass twice under acute hypoxia (20% air saturation [AS]) 5 wk apart and once under normoxia (>85% AS) in between...
January 2018: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29117428/change-in-knee-flexor-torque-after-fatiguing-exercise-identifies-previous-hamstring-injury-in-football-players
#5
Cameron Lord, Fadi Ma'ayah, Anthony J Blazevich
PURPOSE: Muscular fatigue and inter-limb strength asymmetry are factors known to influence hamstring injury risk, however limb-specific exacerbation of knee flexor (hamstrings) torque production after fatiguing exercise has previously been ignored. To investigate changes in muscular force production before and after sport-specific (repeated-sprint) and non-specific (knee extension-flexion) fatiguing exercise, and explore the sensitivity and specificity of isokinetic endurance (i.e. muscle-specific) and single-leg vertical jump (i...
November 8, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29084095/a-multiple-repeated-sprint-ability-test-for-badminton-players-involving-four-changes-of-direction-validity-and-reliability-part-1
#6
Michael Phomsoupha, Quentin Berger, Guillaume Laffaye
The purpose of the present study was: i) to develop a new sport-specific, repeated sprint ability test involving four changes of direction, namely, the multiple repeated sprint ability (MRSAB) test for badminton players; ii) to determine its validity by comparing the results of five different skill levels; and iii) to assess the link between the new test and neuromuscular lower limb and physiological variables. For this purpose, 42 participants were separated into five groups in order to perform the MRSAB test at the same time of day, on two occasions, separated by at least 48 hours...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29084093/the-acute-effects-of-the-elevation-training-mask-on-strength-performance-in-recreational-weightlifters
#7
Andrew R Jagim, Trevor A Dominy, Clayton L Camic, Glenn Wright, Scott Doberstein, Margaret T Jones, Jonathan M Oliver
The Elevation Training Mask 2.0 (ETM) is a novel device that purportedly simulates altitude training. The purpose of this study was to investigate the acute effects of the ETM on resistance exercise performance, metabolic stress markers, and ratings of mental fatigue. Twenty male recreational weightlifters completed two training sessions of back squat and bench press (6 sets of 10 repetitions at 85% of 5RM, 7 set to failure) as well as a maximal effort sprint test (18% body mass) with the mask (ETM) and without the mask (NM)...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29075200/neuromuscular-adaptations-to-multimodal-injury-prevention-programs-in-youth-sports-a-systematic-review-with-meta-analysis-of-randomized-controlled-trials
#8
Oliver Faude, Roland Rössler, Erich J Petushek, Ralf Roth, Lukas Zahner, Lars Donath
Objective: Neuromuscular injury prevention programs (IPP) can reduce injury rate by about 40% in youth sport. Multimodal IPP include, for instance, balance, strength, power, and agility exercises. Our systematic review and meta-analysis aimed to evaluate the effects of multimodal IPP on neuromuscular performance in youth sports. Methods: We conducted a systematic literature search including selected search terms related to youth sports, injury prevention, and neuromuscular performance. Inclusion criteria were: (i) the study was a (cluster-)randomized controlled trial (RCT), and (ii) investigated healthy participants, up to 20 years of age and involved in organized sport, (iii) an intervention arm performing a multimodal IPP was compared to a control arm following a common training regime, and (iv) neuromuscular performance parameters (e...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29072025/does-small-sided-games-training-improve-physical-fitness-and-specific-skills-for-team-sports-a-systematic-review-with-meta-analysis
#9
Amri Hammami, Tim J Gabbett, Maamer Slimani, Ezdine Bouhlel
INTRODUCTION: This paper aimed to systematically review and meta-analyse the training effects of small-sided games (SSG) on physical fitness and specific skills related to team sport according to the level of play and the period of the season. EVIDENCE ACQUISITION: The search covered the following electronic databases (PubMed, Google Scholar, and ScienceDirect). The publications' search period ranged from 2000 to 2016. The terms (small- sided game, training, skill-based game, aerobic fitness, sprint, agility, jump and team sports) were used either singularly or combined in a systematic sequence...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29051347/bp-measurement-in-clinical-practice-time-to-sprint-to-guideline-recommended-protocols
#10
Paul E Drawz, Joachim H Ix
Hypertension is the leading chronic disease risk factor in the world and is especially important in patients with CKD, nearly 90% of whom have hypertension. Recently, in the Systolic BP Intervention Trial (SPRINT), intensive lowering of clinic systolic BP to a target <120 mm Hg, compared with a standard BP target of <140 mm Hg, reduced risk for cardiovascular disease and all-cause mortality. However, because BP was measured unobserved using an automated device, some investigators have questioned the ability to translate SPRINT results into routine clinical practice, in which measurement of BP is typically less standardized...
October 19, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29045314/repeated-sprint-ability-in-division-i-collegiate-male-soccer-players-positional-differences-and-relationships-with-performance-tests
#11
Robert G Lockie, Matthew R Moreno, Ashley J Orjalo, Alyssa A Stage, Tricia M Liu, Samantha A Birmingham-Babauta, Jillian M Hurley, Ibett A Torne, Megan D Beiley, Fabrice G Risso, DeShaun L Davis, Adrina Lazar, John J Stokes, Dominic V Giuliano
Repeated-sprint ability (RSA) in essential for soccer. Important considerations when assessing RSA is whether there are differences between positions (defenders, midfielders, forwards), and what physiological characteristics may contribute to RSA. This has not been assessed in collegiate male players. Eighteen Division I male field players from one school performed several performance tests. The RSA test involved 7 x 30-m sprints completed on 20-s cycles. Measurements included total time (TT), and performance decrement (percent change in time from the first to last sprint; PD)...
October 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29040268/benefit-and-harm-of-intensive-blood-pressure-treatment-derivation-and-validation-of-risk-models-using-data-from-the-sprint-and-accord-trials
#12
Sanjay Basu, Jeremy B Sussman, Joseph Rigdon, Lauren Steimle, Brian T Denton, Rodney A Hayward
BACKGROUND: Intensive blood pressure (BP) treatment can avert cardiovascular disease (CVD) events but can cause some serious adverse events. We sought to develop and validate risk models for predicting absolute risk difference (increased risk or decreased risk) for CVD events and serious adverse events from intensive BP therapy. A secondary aim was to test if the statistical method of elastic net regularization would improve the estimation of risk models for predicting absolute risk difference, as compared to a traditional backwards variable selection approach...
October 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29035595/the-influence-of-physical-qualities-on-activity-profiles-of-female-australian-football-match-play
#13
Georgia M Black, Tim J Gabbett, Rich D Johnston, Michael H Cole, Geraldine Naughton, Brian Dawson
PURPOSE: The rapid transition of female Australian football players from amateur to semi-elite competitions has the potential for athletes to be underprepared for match-play. To gain an understanding the match demands of female football, the aims of this study were three-fold: (1) to highlight the physical qualities that discriminate selected and non-selected female Australian Football players, (2) to investigate activity profiles of female Australian Football players, and (3) to gain an understanding of the influence of physical qualities on running performance in female Australian Football match-play...
October 16, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29034224/trends-in-motor-performance-of-first-graders-a-comparison-of-cohorts-from-2006-to-2015
#14
Sarah Spengler, Matthias Rabel, Arvid Marius Kuritz, Filip Mess
BACKGROUND: Motor performance is an important factor for health. Already in childhood, motor performance is associated with, e.g., obesity and risk factors for cardiovascular diseases. It is widely believed that the motor performance of children has declined over recent years. However, this belief is lacking clear evidence. The objective of this study was to examine trends in motor performance of first grade students during a period of 10 years (2006-2015). We examined trends in (a) aerobic fitness, (b) strength, (c) speed, and (d) balance for boys and girls separately and considered body mass index (BMI) as a potential confounder...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29032729/impact-of-inserted-long-rest-periods-during-repeated-sprint-exercise-on-performance-adaptation
#15
Akiho Ikutomo, Nobukazu Kasai, Kazushige Goto
Repeated sprint training consists of a series of brief maximal sprints, 3-7 s in duration, separated by short rest periods of <60 s. However, little is known about the influence of different rest period lengths between sprints on performance adaptation. We determined the influence of inserting long rest periods during repeated sprint training on performance adaptation in competitive athletes. Twenty-one well-trained athletes were separated into either the short rest period group (SHORT; n = 10) or the long rest period group (LONG; n = 11)...
October 14, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29018362/effects-of-unloaded-vs-loaded-plyometrics-on-speed-and-power-performance-of-elite-young-soccer-players
#16
Ronaldo Kobal, Lucas A Pereira, Vinicius Zanetti, Rodrigo Ramirez-Campillo, Irineu Loturco
The purpose of this study was to investigate the effects of loaded and unloaded plyometric training strategies on speed and power performance of elite young soccer players. Twenty-three under-17 male soccer players (age: 15.9 ± 1.2 years, height: 178.3 ± 8.1 cm, body-mass (BM): 68.1 ± 9.3 kg) from the same club took part in this study. The athletes were pair-matched in two training groups: loaded vertical and horizontal jumps using an haltere type handheld with a load of 8% of the athletes' body mass (LJ; n = 12) and unloaded vertical and horizontal plyometrics (UJ; n = 11)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29016476/effects-of-in-season-circuit-training-on-physical-abilities-in-male-handball-players
#17
Souhail Hermassi, Rainer Wollny, René Schwesig, Roy J Shephard, Mohamed Souhaiel Chelly
This study analyzed the effects of a resistance-type circuit training program (RCT) (30-35 minutes, performed twice a week for 10 weeks) on male handball players. Twenty-two males were divided into experimental (E; age 20.3 ± 0.5 years) and control groups (C; age 20.1± 0.5 years). Measures before and after RCT included squat (SJ) and countermovement jumps (CMJ), one repetition maximum (1-RM) ofbench press, pull-over and back half-squats, throwing velocity (a 3-step throw with run (RT), and a jump throw (JT)), repeated-sprint ability (six 2 x 15-m shuttle sprints with recording of best time for a single trial), anthropometric estimates of leg and thigh muscle volumes and mean thigh cross-sectional area (CSA), and a test of agility...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29016475/relationship-between-physiological-off-ice-testing-on-ice-skating-and-game-performance-in-division-i-women-s-ice-hockey-players
#18
Michelle Boland, Emily M Miele, Katie Delude
The purpose was to identify off-ice testing variables that correlate to skating and game performance in Division I collegiate women ice hockey players. Twenty female, forward and defensive players (19.95 ± 1.35 yr) were assessed for weight, height, percent fat mass (%FAT), bone mineral density, predicted one repetition maximum (RM) absolute and relative (REL%) bench press (BP) and hex bar deadlift (HDL), lower body explosive power, anaerobic power, countermovement vertical jump (CMJ), maximum inspiratory pressure (MIP), and on-ice repeated skate sprint (RSS) performance...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28991036/no-effect-of-%C3%AE-alanine-on-muscle-function-and-kayak-performance
#19
Signe Refsgaard Bech, Tobias Schmidt Nielsen, Martin Hald, Jarl Pors Jakobsen, Nikolai Baastrup Nordsborg
PURPOSE: It was investigated if β-alanine supplementation counteracts muscular fatigue development or improves athletic performance. METHODS: Elite kayak rowers (10 males and 7 females) were supplemented with either 80 mg/kg body mass/day β-alanine or placebo for 8 weeks. Muscular fatigue development was investigated by applying a 2 min elbow flexor maximal voluntary contraction (MVC). Electromyography (EMG) was recorded continuously and voluntary activation (VA) was determined 30, 60, 90 and 115 s into the 2 min MVC...
October 5, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28981450/determinant-factors-of-physical-performance-and-specific-throwing-in-handball-players-of-different-ages
#20
Manuel Ortega-Becerra, Fernando Pareja-Blanco, Pedro Jiménez-Reyes, Víctor Cuadrado-Peñafiel, Juan José González-Badillo
This study aimed to analyze various fitness qualities in handball players of different ages, and to determine the relationships between these parameters and throwing velocity. Forty-four handball players participated, pooled by age groups: ELITE (n = 13); under-18 (U18, n = 16); under-16 (U16, n = 15). The following tests were completed: 20-m running sprints; countermovement jumps (CMJ); jump squat to determine the load that elicited ∼20 cm jump height (JSLOAD-20cm); a progressive loading test in full-squat and bench-press to determine the load that elicited ∼1 m·s (SQ-V1-LOAD and BP-V1-LOAD), and handball throwing (Jump Throw and 3-Step Throw)...
June 2, 2017: Journal of Strength and Conditioning Research
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