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https://www.readbyqxmd.com/read/28726074/error-performances-of-a-model-based-biplane-fluoroscopic-system-for-tracking-knee-prosthesis-during-treadmill-gait-task
#1
Arnaud Barré, Kamiar Aminian
Roentgen stereophotogrammetry analysis technique allows an accurate measurement of knee joint prosthesis position and orientation using two X-ray images. Although this technique is used generally during static procedure, it is possible to use it with a biplane fluoroscopic system to measure the prosthesis kinematics during functional tasks (e.g., gait, squat, jump) performed in a laboratory environment. However, the performance of the system in terms of errors for the measurements and the model-based matching algorithm are not well known for dynamic tasks such as walking...
July 18, 2017: Medical & Biological Engineering & Computing
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/28723812/effects-of-12-weeks-resistance-training-on-sprint-and-jump-performance-in-competitive-adolescent-rugby-union-players
#3
Simon K Harries, David R Lubans, Anthony Buxton, Thomas H J MacDougall, Robin Callister
Sprint performance is an important characteristic for success in many sports, including rugby union. Resistance training is used to increase muscular fitness (i.e. strength, endurance and power) and may also be effective for improving sprint and jump performances. The aims of this study were to examine the effects of resistance training using two different periodized programs (linear and daily undulating) on sprint and jump performance and explore relationships between performance measures. Sixteen male (16...
July 17, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28714767/comparison-of-methods-of-calculating-dynamic-strength-index
#4
Paul Comfort, Christopher Thomas, Thomas Dos'Santos, Paul A Jones, Timothy J Suchomel, John J McMahon
PURPOSE: To determine the reliability and variability of dynamic strength index (DSI) calculated from squat jump (SJ) (DSI-SJ) versus countermovement jump (CMJ) (DSI-CMJ) peak force (PF) and to compare DSI values between methods. METHODS: Male youth soccer and rugby league players (n = 27; age = 17.2 ± 0.7 years; height = 173.9 ± 5.7 cm; body mass = 71.1 ± 7.2 kg) performed 3 trials of the SJ, CMJ and isometric mid-thigh pull (IMTP), on two separate days. DSI was calculated by dividing the PF during each jump by the IMTP PF...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28714743/an-alternate-test-of-tackling-ability-in-rugby-league-players
#5
Michael J A J Speranza, Tim J Gabbett, David A Greene, Rich D Johnston, Andrew D Townshend, Brett O'Farrell
This study investigated the relationship between two tests of tackling ability, muscular strength and power in semi-professional rugby league players. Thirty-one players, 19 first grade and 12 second grade underwent tests of muscular strength (1 repetition maximum bench press, chin-up, and squat) and power (plyometric push-up and countermovement jump). Tackling ability was assessed via video analysis of under-the-ball and over-the-ball tackle drills. The first grade players had significantly greater scores in both the under-the-ball (P = 0...
July 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28704309/effect-of-three-different-muscle-action-training-protocols-on-knee-strength-ratios-and-performance
#6
Cassio V Ruas, Lee E Brown, Camila D Lima, Pablo B Costa, Ronei S Pinto
Hamstring to quadriceps (H:Q) ratios are often used to assess strength imbalances. The aims of this study were to compare three different muscle action training protocols on H:Q strength balance and functional performance. Forty untrained males (age: 22.87 ± 2.28 y, mass: 70.66 ± 11.049 kg, ht: 174.29 ± 6.90 cm) performed 6 weeks of training on an isokinetic dynamometer. They were randomly assigned to one of 4 groups; concentric quadriceps and concentric hamstring (CON/CON), eccentric quadriceps and eccentric hamstring (ECC/ECC), concentric quadriceps and eccentric hamstring (CON/ECC), or no training (CNTRL)...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28702697/the-acute-effect-of-strength-exercises-at-different-intensities-on-intraocular-pressure
#7
Jesús Vera, Amador García-Ramos, Raimundo Jiménez, David Cárdenas
BACKGROUND: This study aimed to determine the effect of two basic strength exercises with progressive loads on intraocular pressure (IOP). METHODS: Seventeen (out of 20 recruited) physically active male military officers (46 ± 4.77 years) performed the jump squat and the ballistic bench press exercises, in counterbalanced order, with four and five progressive loads, respectively. IOP was measured with a rebound tonometer before and after each of the corresponding loads...
July 12, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28700515/mechanical-metabolic-and-perceptual-acute-responses-to-different-set-configurations-in-full-squat
#8
J M González-Hernádez, A García-Ramos, F Capelo-Ramírez, A Castaño-Zambudio, G Marquez, D Boullosa, P Jiménez-Reyes
This study aimed to compare mechanical, metabolic, and perceptual responses between two traditional (TR) and four cluster (CL) set configurations. In a counterbalanced randomized order, 11 men were tested with the following protocols in separate sessions (sets × repetitions [inter-repetition rest]): TR1: 3×10 [0-s]; TR2: 6×5 [0-s]; CL1: 3×10 [10-s]; CL2: 3×10 [15-s]; CL3: 3×10 [30-s]); CL4: 1×30 [15-s]). The exercise (full-squat), number of repetitions (30), inter-set rest (5 min), and resistance applied (10RM) was the same for all set configurations...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28700511/quantifying-changes-in-squat-jump-height-across-a-season-of-men-s-collegiate-soccer
#9
Matt L Sams, Kimitake Sato, Brad H DeWeese, Adam L Sayers, Michael H Stone
The purposes of this study were to examine the effectiveness of an athlete monitoring program in managing athlete neuromuscular fatigue across a men's collegiate soccer season as measured by changes in squat jump (SJ) height and to compare possible changes with session rating of perceived exertion (sRPE) training load (TL). Eighteen outfield Division I men's college soccer players performed SJ testing prior to each game of the fall season in addition to a baseline measurement at the start of pre-season. The athletes provided sRPE values after all training sessions, weight training, and games...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28699923/the-effects-of-moderate-versus-high-load-resistance-training-on-muscle-growth-body-composition-and-performance-in-collegiate-women
#10
Jason M Cholewa, Fabricio E Rossi, Christopher MacDonald, Amy Hewins, Samantha Gallo, Ashley Micenski, Layne Norton, Bill I Campbell
Twenty young women (20.3+1.5 years, 164+6 cm, 68.7+13.8 kg) without prior structured resistance training experience were recruited for this study. Body composition (BodPod), compartmental water (Bioelectrical Impedance), 7-site skinfold, and arm and thigh CSA were assessed pre- and post- 8 week training. Performance testing consisted of vertical jump, 3 kg chest pass initial velocity, squat 1RM and overhead press 1RM. Following 2 weeks of familiarization training, subjects were matched for body composition and relative squat strength, and randomly assigned to either a high- (HL: n=10; 4 sets of 5-7 repetitions) or moderate-load (ML: n=10; 2 sets of 10-14 repetitions) group that completed 6-7 exercises per day performed to momentary muscular failure...
June 2, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28686081/letter-to-the-editor-concerning-the-article-bar-velocities-capable-of-optimising-the-muscle-power-in-strength-power-exercises-by-loturco-pereira-abad-tabares-moraes-kobal-kitamura-nakamura-2017
#11
Slobodan Jaric, Amador Garcia Ramos
Loturco and co-workers (2017) recently published data in the Journal of Sports Sciences to present the optimum loading magnitudes regarding the maximization of the "mean propulsive power" of the leg and arm muscles. Among the most important findings were that (1) the recorded power in the squat and squat jump exercises was markedly low, (2) the optimum external load that maximized the power in the same exercises was close to 100% of body weight, while (3) the ballistic bench press throw revealed smaller power than the regular bench press typically performed with relatively low level of muscle activation towards the end of the propulsive lifting phase...
July 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28678768/effects-of-lower-limb-strength-training-on-agility-repeated-sprinting-with-changes-of-direction-leg-peak-power-and-neuromuscular-adaptations-of-soccer-players
#12
Mehréz Hammami, Yassine Negra, François Billaut, Souhail Hermassi, Roy J Shephard, Mohamed Souhaiel Chelly
We examined the effects on explosive muscular performance of incorporating 8 weeks strength training into the preparation of junior male soccer players, allocating subjects between an experimental group (E, n=19) and a matched control group (C, n=12). Controls maintained their regular training program, but the experimental group replaced a part of this schedule by strength training. Performance was assessed using running times (5m, 10m, 20m, 30 and 40m), a sprint test with 180° turns (S180°), a 9-3-6-3-9 m sprint with backward and forward running (SBF), a 4 x 5 m sprint test with turns, repeated shuttle sprinting, repeated changes of direction, squat (SJ) and counter-movement (CMJ) jumping, back half-squatting, and a force-velocity test...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28675792/non-localized-postactivation-performance-enhancement-pape-effects-in-trained-athletes-a-pilot-study
#13
Francisco Cuenca-Fernández, Ian C Smith, Matthew J Jordan, Brian R MacIntosh, Gracia López-Contreras, Raúl Arellano, Walter Herzog
Fifteen trained athletes were assessed for postactivation performance enhancement (PAPE) of squat jumps (SJ) and power push-ups (PPU) following upper body activation, lower body activation, upper and lower body activation, and rest. SJ improved similarly across all four conditions. PPU could not be assessed. Since the test protocol of SJ and PPU involved upper and lower body activation and caused PAPE in SJ, future work is required to determine if a non-localized PAPE effect exists.
July 4, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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
#14
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/28662163/association-between-laboratory-capacities-and-world-cup-performance-in-nordic-combined
#15
Vegard Rasdal, Ronny Fudel, Jan Kocbach, Frode Moen, Gertjan Ettema, Øyvind Sandbakk
BACKGROUND: Nordic combined (NC) is an Olympic winter-sport performed as a ski jumping (SJ) event followed by a cross-country (XC) pursuit race employing the skating style. PURPOSE: To elucidate the associations between sport-specific laboratory capacities and SJ, XC skiing, and overall NC performance in a world-cup NC event. METHODS: Twelve international world-cup NC athletes from 8 nations performed laboratory testing one day prior to participating in a world-cup NC event...
2017: PloS One
https://www.readbyqxmd.com/read/28658084/addition-of-glute-ham-gastroc-raise-to-a-resistance-training-program-effect-on-jump-propulsion-and-landing
#16
Loren Z F Chiu, Anita Yaremko, Gabriella L vonGaza
Exercises such as squats and cleans are commonly used in resistance training programs to enhance athletic performance. However, these exercises may not effectively train the gastrocnemius, an important muscle for energy generation and absorption. The purpose of this research was to examine the effects of adding glute-ham-gastroc raise exercise to target the gastrocnemius to a traditional resistance training program involving squats and cleans. Vertical jump height, weight-bearing ankle dorsiflexion, and jump propulsion and landing mechanics were examined before and after an eight-week training intervention in female youth volleyball players...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28658081/the-positional-anthropometric-and-performance-profile-of-elite-gaelic-football-players
#17
Aidan Shovlin, Mark Roe, Shane Malone, Kieran Collins
The aim of the current investigation was to evaluate the variation in the anthropometric and performance characteristics of elite Gaelic football players with respect of position. One hundred and forty-eight elite Gaelic footballers underwent anthropometric (height, body mass, sum of seven skinfolds, % adipose tissue) and performance [counter movement jump height (CMJ), CMJ peak power, CMJ relative peak power, squat jump height (SJ), SJ peak power, SJ relative peak power, 5-, 10- and 20 m sprint times and Yo-Yo Intermittent Recovery Test Level 2 (Yo-YoIRT2)] during 'the early in-season' phase...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28658079/validity-and-usability-of-a-new-system-for-measuring-and-monitoring-variations-in-vertical-jump-performance
#18
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Katia Kitamura, César C Cal Abad, Guilherme Marques, Aristide Guerriero, José E Moraes, Fábio Y Nakamura
Vertical jump height (VJ) is one of the most sensitive measures to quantify training-related fatigue and athletic performance in elite athletes. Currently, however, there is no equipment designed to graphically deliver the daily performance changes in VJ compared with the smallest worthwhile change (SWC), which is considered essential in "progressive statistics" to judge meaningful performance fluctuations. The aims of the study were to analyze the criterion validity of a new contact mat (i.e., Elite Jump®), alongside testing its usability to detect meaningful changes in VJ of elite team sport athletes...
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
#19
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/28657932/the-influence-of-external-load-on-quadriceps-muscle-and-tendon-dynamics-during-jumping
#20
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
Tendons possess both viscous (rate-dependent) and elastic (rate-independent) properties that determine tendon function. During high-speed movements external loading increases both the magnitude (FT) and rate (RFDT) of tendon loading. PURPOSE: The influence of external loading on muscle and tendon dynamics during maximal vertical jumping was explored. METHODS: Ten resistance-trained men performed parallel-depth, countermovement vertical jumps with and without additional load (0%, 30%, 60% and 90% of maximum squat lift strength), while joint kinetics and kinematics, quadriceps tendon length (LT) and patellar tendon FT and RFDT were estimated using integrated ultrasound, motion analysis and force platform data and muscle-tendon modelling...
June 27, 2017: Medicine and Science in Sports and Exercise
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