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https://www.readbyqxmd.com/read/28731979/global-positioning-system-analysis-of-a-high-school-football-scrimmage
#1
Benjamin H Gleason, Matthew L Sams, John T Salley, A Andrew Pustina, Michael H Stone
Gleason, BH, Sams, M, Salley, JT, Pustina, A, and Stone, MH. Global positioning system analysis of a high school football scrimmage. J Strength Cond Res 31(8): 2183-2188, 2017-The purpose of this study was to examine the physical demands of a high school American football scrimmage. Male high school football players (N = 25) participated in a spring scrimmage. Global positioning system data and game film were recorded throughout the entirety of the scrimmage to determine the total distance covered, the distance covered in different velocity bands, the number of accelerations and decelerations performed, and the work-to-rest ratio of the scrimmage...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28723816/importance-of-physical-qualities-for-speed-and-change-of-direction-ability-in-elite-female-soccer-players
#2
Stacey Emmonds, G Nicholson, C Beggs, B Jones, A Bissas
The purpose of this study was to determine the importance of physical qualities for speed and change of direction (CoD) ability in female soccer players. Data were collected on 10 female soccer players who were part of a professional English Women's Super League team. Player assessments included anthropometric (stature and body mass), body composition (dual-energy X-ray absorptiometry), speed (10m, 30m sprint), CoD ability (505 agility), aerobic (Yo-Yo Intermittent Recovery Test), lower-body strength (bilateral knee extensions) and power (countermovement jump [CMJ], squat jump [SJ], 30cm drop jump [DJ]) measures...
July 17, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28714746/age-related-changes-in-endurance-performance-vary-between-modes-of-locomotion-in-men-an-analysis-of-master-world-records
#3
Romuald Lepers, Paul J Stapley, Thomas Cattagni
BACKGROUND: Age-related declines in sport performance are characteristic of all endurance and sprinting disciplines. However, it is not known if the mode of locomotion (i.e. swimming, cycling or running) influences the age-related decline in sport performance in sprinting and endurance events. METHODS: To examine the age-related decline in three different modes of locomotion (i.e. swimming, cycling and running) for endurance and sprint events, the world best performances achieved for males in the age-groups 18-39 years, 40-44 years, 45-49 years, 50-54 years, 55-59 years, 60-64 years, 65-69 years, 70-74 years, 75-79 years and 80-84 years, were compared in swimming (1500-m and 50-m), cycling (1-h and 200-m) and running (10-km and 100-m)...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28713281/effectiveness-of-traditional-strength-vs-power-training-on-muscle-strength-power-and-speed-with-youth-a-systematic-review-and-meta-analysis
#4
REVIEW
David G Behm, James D Young, Joseph H D Whitten, Jonathan C Reid, Patrick J Quigley, Jonathan Low, Yimeng Li, Camila D Lima, Daniel D Hodgson, Anis Chaouachi, Olaf Prieske, Urs Granacher
Numerous national associations and multiple reviews have documented the safety and efficacy of strength training for children and adolescents. The literature highlights the significant training-induced increases in strength associated with youth strength training. However, the effectiveness of youth strength training programs to improve power measures is not as clear. This discrepancy may be related to training and testing specificity. Most prior youth strength training programs emphasized lower intensity resistance with relatively slow movements...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28704308/fatigue-in-u12-soccer-7-players-during-repeated-one-day-tournament-games-a-pilot-study
#5
Javier Sanchez-Sanchez, Mario Sanchez, Daniel Hernandez, Rodrigo Ramirez-Campillo, Cristian Martínez, Fabio Y Nakamura
The aim of this study was to describe and compare the distances and displacement speeds of U12 Soccer-7 athletes during four tournament Soccer-7 games (TG) played in less than 24-h (experimental condition) with those recorded during two league Soccer-7 games (LG) with 24-h of rest prior to the match (control condition). Ten participants (age = 10.3 ± 0.5 years) were recruited for the study. Main data analyzed during games included distance completed relative to match duration (Drel), maximal velocity and distance completed at different running speeds (including acceleration, deceleration, standing, walking, jogging, medium-intensity running, high-intensity running and sprinting)...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28700513/sled-towing-acutely-decreases-acceleration-sprint-time
#6
Megan A Wong, Ian J Dobbs, Casey M Watkins, Saldiam R Barillas, A Lin, David C Archer, Robert G Lockie, Jared W Coburn, Lee E Brown
Sled towing is a common form of overload training in sports to develop muscular strength for sprinting. This type of training leads to acute and chronic outcomes. Acute training potentially leads to postactivation potentiation (PAP), which is when subsequent muscle performance is enhanced following a preload stimulus. The purpose of this study was to determine differences between rest intervals following sled towing on acute sprint speed. Twenty healthy recreationally trained males (age= 22.3 ± 2.4yrs, height= 176...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28700512/influence-of-morphology-and-strength-on-front-crawl-swimming-speed-in-junior-and-youth-age-group-swimmers
#7
Marek Strzała, Arkadiusz Stanula, Piotr Krężałek, Andrzej Ostrowski, Marcin Kaca, Grzegorz Głąb
OBJECTIVES: this study, conducted in two male age groups, was aimed at analysing the influence of body properties, dry-land strength and swimming strength on 50 m crawl (VCrawl). METHODS: We examined two competitive groups, Youth (20.6 ± 1.05), and Junior, (17.3 ± 0.59), through: a. (lean) body mass (BM and LBM), (total) body height (BH and TBL) and arm span (AS); b. counter movement jump (CMJ) and maximum isometric strength of elbow and knee joints; c. tethered crawl strength...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28699924/position-specific-acceleration-and-deceleration-profiles-in-elite-youth-and-senior-soccer-players
#8
Jeppe F Vigh-Larsen, Ulrik Dalgas, Thomas B Andersen
The purpose of the study was to characterize and compare the position specific activity profiles of young and senior elite soccer players with special emphasis put on accelerations and decelerations. Eight professional senior matches were tracked using the ZXY tracking system and analyzed for number of accelerations and decelerations and running distances within different speed zones. Likewise, four U19- and five U17 matches were analyzed for comparison between youth and senior players. In senior players the total distance (TD) was 10776±107 m with 668±28 and 143±10 m being high-intensity running (HIR) and sprinting, respectively...
April 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28697691/the-relationship-between-mechanical-stiffness-and-athletic-performance-markers-in-sub-elite-footballers
#9
Judd T Kalkhoven, Mark L Watsford
This study investigated the relationship between several measures of lower-body stiffness and physical performance variables in 22 sub-elite male football players (mean ± SD; 21.9 ± 1.5 yr; 1.79 ± 0.06 m; 72.2 ± 7.2 kg). The participants were assessed for individual muscle stiffness of the Rectus Femoris (RF), Biceps Femoris (BF) and Medial Gastrocnemius (MG) muscles and vertical stiffness (Kvert) was also assessed assessed running acceleration, maximal sprint speed, agility, vertical jumping and muscular strength...
July 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28691124/measuring-changes-in-gait-and-vehicle-transfer-ability-during-inpatient-rehabilitation-with-wearable-inertial-sensors
#10
Vladimir Borisov, Gina Sprint, Diane J Cook, Douglas L Weeks
Restoration of functional independence in gait and vehicle transfer ability is a common goal of inpatient rehabilitation. Currently, ambulation changes tend to be subjectively assessed. To investigate more precise objective assessment of progress in inpatient rehabilitation, we quantitatively assessed gait and transfer performances over the course of rehabilitation with wearable inertial sensors for 20 patients receiving inpatient rehabilitation services. Secondarily, we asked physical therapists to provide feedback about the clinical utility of metrics derived from the sensors...
March 2017: Proc IEEE Int Conf Pervasive Comput Commun Workshops
https://www.readbyqxmd.com/read/28683419/deviating-running-kinematics-and-hamstring-injury-susceptibility-in-male-soccer-players-cause-or-consequence
#11
Joke Schuermans, Damien Van Tiggelen, Tanneke Palmans, Lieven Danneels, Erik Witvrouw
BACKGROUND: Although the vast majority of hamstring injuries in male soccer are sustained during high speed running, the association between sprinting kinematics and hamstring injury vulnerability has never been investigated prospectively in a cohort at risk. PURPOSE: This study aimed to objectify the importance of lower limb and trunk kinematics during full sprint in hamstring injury susceptibility. STUDY DESIGN: Cohort study; level of evidence, 2...
June 27, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28662531/effects-of-in-season-explosive-strength-training-on-maximal-leg-strength-jumping-sprinting-and%C3%A2-intermittent-aerobic-performance-in-male-handball-athletes
#12
Souhail Hermassi, Mohamed Souhaiel Chelly, Georg Fieseler, Thomas Bartels, Stephan Schulze, Karl-Stefan Delank, Roy J Shephard, René Schwesig
Background Team handball is an intense ball sport with specific requirements on technical skills, tactical understanding, and physical performance. The ability of handball players to develop explosive efforts (e. g. sprinting, jumping, changing direction) is crucial to success. Objective The purpose of this pilot study was to examine the effects of an in-season high-intensity strength training program on the physical performance of elite handball players. Materials and methods Twenty-two handball players (a single national-level Tunisian team) were randomly assigned to a control group (CG; n = 10) or a training group (TG; n = 12)...
June 29, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28659414/how-do-prosthetic-stiffness-height-and-running-speed-affect-the-biomechanics-of-athletes-with-bilateral-transtibial-amputations
#13
Owen N Beck, Paolo Taboga, Alena M Grabowski
Limited available information describes how running-specific prostheses and running speed affect the biomechanics of athletes with bilateral transtibial amputations. Accordingly, we quantified the effects of prosthetic stiffness, height and speed on the biomechanics of five athletes with bilateral transtibial amputations during treadmill running. Each athlete performed a set of running trials with 15 different prosthetic model, stiffness and height combinations. Each set of trials began with the athlete running on a force-measuring treadmill at 3 m s(-1), subsequent trials incremented by 1 m s(-1) until they achieved their fastest attainable speed...
June 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28658075/evaluation-of-the-official-match-external-load-in-soccer-players-with-cerebral-palsy
#14
J Yanci, D Castillo, A Iturricastillo, R Reina
The aims of this study were to analyze the official match external loads (i.e. total distance [TD], distance covered at different speeds, accelerations, decelerations, player load [PL], peak metabolic power [PMP] and changes of direction [CODs]) of football players with cerebral palsy (CP), and to determine the external loads according to playing time (i.e. < 20 min, 20-40 min and > 40 min). The external load of thirty-one international football players with CP (23.0 ± 6.6 years; 69.1 ± 9.0 kg; 174...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28658074/effect-of-physical-and-psychosocial-interventions-on-hormone-and-performance-outcomes-in-professional-rugby-union-players-a-systematic-review
#15
Joshua Strahorn, Benjamin G Serpell, Andrew McKune, Kate L Pumpa
This systematic review investigates the acute effects of physical or psychosocial interventions on testosterone and cortisol responses in elite male rugby union players, and the subsequent association with physical performance areas (e.g. strength, power, sprint performance) or key performance indicators (e.g. coach-identified skills). Medline (via EBSCO), SPORTDiscus, Web of Science, Informit, Proquest, Cochrane and Scopus were searched for relevant articles. Nine articles met the inclusion criteria, with six articles examining the effect of speed, strength or power training, and the remaining three psychosocial interventions...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28658073/monitoring-changes-in-power-speed-agility-and-endurance-in-elite-cricketers-during-the-off-season
#16
Chris Bishop, Ross Herridge, Anthony Turner
The purpose of this study was to monitor changes in power, speed, agility and endurance in elite cricketers during the 20-week off-season period. Fourteen elite male cricketers (age 26.2 ± 5.3years; height 180.8 ± 8.5cm; mass 83.5 ± 6.7kg) conducted a physical testing battery in week 1 and week 18 of the off-season period. The testing included a yoyo intermittent recovery test (yoyo IRT), bilateral and unilateral countermovement jumps (CMJ), squat jump (SJ), broad jump (BJ), drop jump (to calculate reactive strength index - [RSI]), pro agility and 5, 10, 20m sprint tests...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28657807/variability-predictability-and-race-factors-affecting-performance-in-elite-biathlon
#17
Øyvind Skattebo, Thomas Losnegard
PURPOSE: Investigate variability, predictability and smallest worthwhile performance enhancement in elite biathlon sprint events. In addition, the effects of race factors on performance were assessed. METHODS: Data from 2005-2015 including >10,000 and >1000 observations for each sex for all athletes and annual top-10 athletes were included, respectively. Generalized linear mixed models were constructed based on total race time, skiing time, shooting times and proportions of targets hit...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28654503/effectiveness-of-functional-power-training-on-walking-ability-in-young-children-with-cerebral-palsy-study-protocol-of-a-double-baseline-trial
#18
Liesbeth F van Vulpen, Sonja de Groot, Eugene A A Rameckers, Jules G Becher, Annet J Dallmeijer
PURPOSE: To evaluate the effect of functional high-velocity resistance (power) training to improve walking ability of young children with cerebral palsy. METHODS: Twenty-two children with bi- or unilateral spastic cerebral palsy, Gross Motor Function Classification System levels I and II, aged 4 to 10 years will be recruited. A double-baseline design will be used to compare a 14-week functional power training (3 times a week) program with a 14-week usual care period and a 14-week follow-up period...
July 2017: Pediatric Physical Therapy
https://www.readbyqxmd.com/read/28654438/differences-in-athletic-performance-between-sportsmen-with-symptomatic-femoroacetabular-impingement-and-healthy-controls
#19
Karen Mullins, Michael Hanlon, Patrick Carton
OBJECTIVE: Femoroacetabular impingement (FAI) is a commonly recognized condition in athletes characterized by activity-related hip pain and stiffness, which if left untreated can progress to hip osteoarthritis. The aim of the study was to determine the effect of symptomatic FAI on performance in young athletes based on the hypothesis that athletes with FAI would show deficits in performance compared with healthy controls. DESIGN: The functional performance of a cohort of preoperative, competitive sportsmen with symptomatic FAI (FAI group, n = 54), was compared with that of a group of age, sex and activity-level matched controls (n = 66)...
June 22, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28639444/comparison-of-shuttle-and-straight-repeated-sprint-ability-tests-and-their-relationship-to-anthropometrics-and-explosive-muscular-performance-of-lower-limb-in-elite-handball-players
#20
Souhail Hermassi, René Schwesig, Rainer Wollny, Georg Fieseler, Roland van den Tillaar, Jaime Fernandez-Fernandez, Roy J Shephard, Mohamed S Chelly
BACKGROUND: This study assessed inter-relationships between shuttle and straight repeated-sprint ability tests and the relationship of each measure to anthropometric and explosive lower limb performance data in elite handball players. METHODS: Twenty-two elite male handball players (18.9 ± 0.2 years; body mass: 83.3 ± 1.1 kg, height: 1.79 ± 2.30 m, body fat: 12.8 ± 0.2%) completed tests that included a lower limb force-velocity test of peak power (Wpeak), jumping ability (squat and counter-movement jumps; SJ, CMJ), 1 repetition maximum (1-RM) half back squat, average sprint velocity over 5 m (V-5 m), peak velocity between 25-30 m (Vmax), and Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1), and anthropometric determinations of cross-sectional areas and muscle volumes for leg and thigh muscles...
June 21, 2017: Journal of Sports Medicine and Physical Fitness
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