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https://www.readbyqxmd.com/read/29770871/the-effects-of-acute-leucine-or-leucine-glutamine-co-ingestion-on-recovery-from-eccentrically-biased-exercise
#1
Mark Waldron, Cameron Ralph, Owen Jeffries, Jamie Tallent, Nicola Theis, Stephen David Patterson
This study investigated the effects of leucine or leucine + glutamine supplementation on recovery from eccentric exercise. In a double-blind independent groups design, 23 men were randomly assigned to a leucine (0.087 g/kg; n = 8), leucine + glutamine (0.087 g/kg + glutamine 0.3 g/kg; n = 8) or placebo (0.3 g/kg maltodextrin; n = 7) group. Participants performed 5 sets of drop jumps, with each set comprising 20 repetitions. Isometric knee-extensor strength, counter-movement jump (CMJ) height, delayed-onset muscle soreness (DOMS) and creatine kinase (CK) were measured at baseline, 1, 24, 48 h and 72 h post-exercise...
May 16, 2018: Amino Acids
https://www.readbyqxmd.com/read/29770503/a-novel-phase-unwrapping-method-by-using-phase-jump-detection-and-local-surface-fitting-application-to-dixon-water-fat-mri
#2
Junying Cheng, Jijing Guan, Yingjie Mei, Lin Xu, Xiaoyun Liu, Qianjin Feng, Wufan Chen, Yanqiu Feng
PURPOSE: This study aims to develop an accurate and robust phase-unwrapping method that works effectively under severe noise, rapid-varying phase, and disconnected regions for water-fat Dixon MRI. METHODS: The proposed method first segments the phase map into blocks by automatically detecting phase jumps, and then clusters the pixels near phase jumps into residual pixels. Thereafter, the proposed method sequentially performs intrablock, interblock, and residual-pixel unwrapping using the local surface fitting approach...
May 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29768094/lower-limb-stiffness-testing-in-athletic-performance-a-critical-review
#3
Sean J Maloney, Iain M Fletcher
Stiffness describes the resistance of a body to deformation. In regard to athletic performance, a stiffer leg-spring would be expected to augment performance by increasing utilisation of elastic energy. Two-dimensional spring-mass and torsional spring models can be applied to model whole-body (vertical and/or leg stiffness) and joint stiffness. Various tasks have been used to characterise stiffness, including hopping, gait, jumping, sledge ergometry and change of direction tasks. Appropriate levels of reliability have been reported in most tasks, although they vary between investigations...
May 16, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29749751/visual-motor-control-of-drop-landing-after-anterior-cruciate-ligament-reconstruction
#4
Dustin R Grooms, Ajit Chaudhari, Stephen J Page, Deborah S Nichols-Larsen, James A Onate
CONTEXT:   Visual feedback is crucial in the control of human movement. When vision is obstructed, alterations in landing neuromuscular control may increase movements that place individuals at risk for injury. Anterior cruciate ligament (ACL) injury may further alter the motor-control response to alterations in visual feedback. The development of stroboscopic glasses that disrupt visual feedback without fully obscuring it has enabled researchers to assess visual-motor control during movements that simulate the dynamic demands of athletic activity...
May 11, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29746389/effect-of-sand-on-knee-load-during-a-single-leg-jump-task-implications-for-injury-prevention-and-rehabilitation-programs
#5
Mark C Richardson, Sinead Murphy, Tom Macpherson, Bryan English, Iain Spears, Paul Chesterton
Richardson, MC, Murphy, S, Macpherson, T, English, B, Spears, I, and Chesterton, P. Effect of sand on knee load during a single-leg jump task: implications for injury prevention and rehabilitation programs. J Strength Cond Res XX(X): 000-000, 2018-The purpose of the study was to determine potential differences in landing strategies and subsequent joint loads at the knee (knee abduction moment [KAM], anterior-posterior [AP] tibial translation, and total knee shear force) when jumping onto sand and firm ground from both a level surface and a 30-cm height...
May 7, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29740558/the-contribution-analysis-of-knee-compression-bandage-and-arm-swing-control-on-maximum-horizontal-distance-in-standing-long-jump
#6
Che-Cheong Ryew, Seung-Hyun Hyun
The aim of the study was to analyze the effect of knee compression bandage and arm swing control on the maximum horizontal distance and ground reaction force variables in standing long jump. Adult male (n=8; mean age, 22.75±1.98 years; mean heights, 1.77±0.03 m; mean weights, 71.82±12.87 kg) participated in the experiment. The results obtained from variables of ground reaction force (GRF) in medial lateral, anterior posterior (AP), vertical (V) direction, resultant GRF (RGRF), decay rate (%), and maximum horizontal distance (MHD) were as follows; MHD, AP GRF, VGRF, RGRF (AP-V), and ratio of load reduction (%) showed more effective result under both wearing of knee compression bandage and arm swing...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29733043/effect-of-whole-body-vibration-on-neuromuscular-performance-a-literature-review
#7
Mohd Mukhtar Alam, Abid Ali Khan, Mohd Farooq
BACKGROUND: Whole-body vibration (WBV) is a neuromuscular training method that has recently received popularity in health and fitness centers, as an additional or substitute method to conventional training and therapy, in order to improve muscle strength and power. OBJECTIVE: The purpose of this review is to critically observe the effect of WBV training on neuromuscular performance in view of its ability to enhance the muscles strength, power, and flexibility; and also to investigate the influence of the different vibration characteristics (viz...
2018: Work: a Journal of Prevention, Assessment, and Rehabilitation
https://www.readbyqxmd.com/read/29730331/higher-muscle-power-training-volume-is-not-determinant-for-the-magnitude-of-neuromuscular-improvements-in-elderly-women
#8
Régis Radaelli, Clarissa M Brusco, Pedro Lopez, Anderson Rech, Carlos L Machado, Rafael Grazioli, Diana C Muller, Eduardo L Cadore, Ronei S Pinto
The aim of this study was to compare the effects of 12 weeks of muscle power training using one- and three-sets on neuromuscular adaptations in elderly women. Twenty six healthy elderly women were randomly assigned into two groups: one-set (n = 13) and three-sets (n = 13). Maximal dynamic and isometric strength, rapid force assessed as absolute and normalized rate of force development (RTD) and contractile impulse during unilateral leg knee extension at 0-50 and 0-200 ms, overall quadriceps muscle thickness, muscle power during a countermovement jump (CMJ), and functional performance using time-up-and-go and the timed stair climb tests were evaluated before and after training...
May 3, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29722590/correcting-vitamin-d-insufficiency-improves-some-but-not-all-aspects-of-physical-performance-during-winter-training-in-taekwondo-athletes
#9
Hyun Chul Jung, Myong Won Seo, Sukho Lee, Sung Woo Jung, Jong Kook Song
We investigated the effects of vitamin D3 supplementation on physical performance during winter training in vitamin D insufficient taekwondo (TKD) athletes. Thirty-five collegiate male and female TKD athletes, aged 19-22 years with low serum 25(OH)D concentration (28.8±1.10 nmol/L) were randomly assigned to a vitamin D group (N=20) or a placebo group (N=15). Subjects received either a vitamin D3 capsule (5,000 IU/day) or placebo during four weeks of winter training. Blood samples were collected for analyzing serum 25(OH)D concentration...
May 3, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29721781/implicit-video-feedback-produces-positive-changes-in-landing-mechanics
#10
Tijana Popovic, Shane V Caswell, Anne Benjaminse, Tarique Siragy, Jatin Ambegaonkar, Nelson Cortes
BACKGROUND: Implicit (IF) and explicit (EF) feedback are two motor learning strategies demonstrated to alter movement patterns. There is conflicting evidence on which strategy produces better outcomes. The purpose of this study was to examine the effects of reduced IF and EF video feedback on lower extremity landing mechanics. METHODS: Thirty participants (24 ± 2 years, 1.7 ± 0.1 m, 70 ± 11 kg) were randomly assigned to three groups: IF (n = 10), EF (n = 10), and control (CG) (n = 10)...
May 2, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29721606/the-effects-of-different-durations-of-static-stretching-within-a-comprehensive-warm-up-on-voluntary-and-evoked-contractile-properties
#11
Jonathan C Reid, Rebecca Greene, James D Young, Daniel D Hodgson, Anthony J Blazevich, David G Behm
Evidence for performance decrements following prolonged static stretching (SS) has led to a paradigm shift in stretching routines within a warm-up. Rather than SS, dynamic stretching (DS) and dynamic activity (DA) have replaced SS within warm-up routines. The objective of the present study was to compare the effect of differing lower limb SS durations (30 [SS30s], 60 [SS60s] or 120 s [SS120s] of SS per muscle group or no-stretch control) within a comprehensive warm-up protocol consisting of aerobic activity, DS and DA...
May 2, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29700560/greater-fear-of-reinjury-is-related-to-stiffened-jump-landing-biomechanics-and-muscle-activation-in-women-after-acl-reconstruction
#12
Stephanie M Trigsted, Dane B Cook, Kristen A Pickett, Lisa Cadmus-Bertram, Warren R Dunn, David R Bell
PURPOSE: Fear of reinjury is an important factor in determining who returns to sport following anterior cruciate ligament reconstruction (ACLR). Evidence from other musculoskeletal injuries indicates fear of reinjury may be related to stiffened movement patterns observed in individuals following ACLR. The relationship between fear of reinjury and performance on dynamic tasks, however, has not been investigated. Therefore, the purpose of this study was to investigate the relationship between fear of reinjury and jump-landing biomechanics...
April 26, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29693423/landing-kinematics-in-elite-male-youth-soccer-players-of-different-chronologic-age-and-stage-of-maturation
#13
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
CONTEXT:   Despite the high frequency of knee injuries in athletes, few researchers have studied the effects of chronologic age and stage of maturation on knee-joint kinematics in male youth soccer players. OBJECTIVE:   To use a coach-friendly screening tool to examine knee-valgus scores for players of different ages and at different stages of maturation. DESIGN:   Cross-sectional study. SETTING:   Academy soccer clubs...
April 25, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29688136/predictors-of-attack-performance-in-high-level-male-volleyball-players
#14
Dimitrios Challoumas, Andreas Artemiou
PURPOSE: In volleyball, teams win the majority of points through attacks ('spikes') and therefore attack effectiveness (AE) is one of the most important predictors of victory. Traditionally, greater vertical jump heights (VJH) and higher spike speeds (SS) have been thought to increase AE, however relevant research is limited. Our aim was to assess the relationship of VJH and SS with AE as well as identify possible associations of demographic and anthropometric factors, including common volleyball injuries, with VJH, SS and AE...
April 24, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29687012/sex-based-differences-of-medial-collateral-ligament-and-anterior-cruciate-ligament-strains-with-cadaveric-impact-simulations
#15
Nathan D Schilaty, Nathaniel A Bates, Christopher V Nagelli, Aaron J Krych, Timothy E Hewett
Background: Female patients sustain noncontact knee ligament injuries at a greater rate compared with their male counterparts. The cause of these differences in the injury rate and the movements that load the ligaments until failure are still under dispute in the literature. Purpose/Hypotheses: This study was designed to determine differences in anterior cruciate ligament (ACL) and medial collateral ligament (MCL) strains between male and female cadaveric specimens during a simulated athletic task...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29671383/sport-specific-biomechanical-responses-to-an-acl-injury-prevention-programme-a-randomised-controlled-trial
#16
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament (ACL) injury prevention programmes have not been as successful at reducing injury rates in women's basketball as in soccer. This randomised controlled trial (ClinicalTrials.gov #NCT02530333) compared biomechanical adaptations in basketball and soccer players during jump-landing activities after an ACL injury prevention programme. Eighty-seven athletes were cluster randomised into intervention (6-week programme) and control groups. Three-dimensional biomechanical analyses of drop vertical jump (DVJ), double- (SAG-DL) and single-leg (SAG-SL) sagittal, and double- (FRONT-DL) and single-leg (FRONT-SL) frontal plane jump landing tasks were tested before and after the intervention...
April 19, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29667844/lower-extremity-biomechanics-during-a-drop-vertical-jump-in-participants-with-or-without-chronic-ankle-instability
#17
C Collin Herb, Kaitlyn Grossman, Mark A Feger, Luke Donovan, Jay Hertel
CONTEXT:   Chronic ankle instability (CAI) is a condition characterized by range-of-motion, neuromuscular, and postural-control deficits and subjective disability, reinjury, and posttraumatic osteoarthritis. Differences have been reported in kinematics, kinetics, surface electromyography (EMG), and ground reaction forces during functional tasks performed by those with CAI. These measures are often collected independently, and the research on collecting measures simultaneously during a movement task is limited...
April 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29666769/joint-level-energetics-differentiate-isoinertial-from-speed-power-resistance-training-a-bayesian-analysis
#18
Bernard X W Liew, Christopher C Drovandi, Samuel Clifford, Justin W L Keogh, Susan Morris, Kevin Netto
Background: There is convincing evidence for the benefits of resistance training on vertical jump improvements, but little evidence to guide optimal training prescription. The inability to detect small between modality effects may partially reflect the use of ANOVA statistics. This study represents the results of a sub-study from a larger project investigating the effects of two resistance training methods on load carriage running energetics. Bayesian statistics were used to compare the effectiveness of isoinertial resistance against speed-power training to change countermovement jump (CMJ) and squat jump (SJ) height, and joint energetics...
2018: PeerJ
https://www.readbyqxmd.com/read/29660632/female-pfp-patients-present-alterations-in-eccentric-muscle-activity-but-not-the-temporal-order-of-activation-of-the-vastus-lateralis-muscle-during-the-single-leg-triple-hop-test
#19
Marcelo Martins Kalytczak, Paulo Roberto Garcia Lucareli, Amir Curcio Dos Reis, André Serra Bley, Daniela Aparecida Biasotto-Gonzalez, João Carlos Ferrari Correa, Fabiano Politti
This study aimed to compare the concentric and eccentric activity and the temporal order of peak activity of the hip and knee muscles between women with patellofemoral pain (PFP) and healthy women during the single leg triple hop test (SLTHT). Electromyographic (EMG) and Kinematic data were collected from 14 healthy women (CG) and 14 women diagnosed with PFP (PFG) during a single session of the single leg triple hop test. Integral surface electromyography (iEMG) data of the hip and knee muscles in eccentric and concentric phases and the length of time that each muscle needed to reach the maximal peak of muscle activity were calculated...
April 7, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29659539/post-game-high-protein-intake-may-improve-recovery-of-football-specific-performance-during-a-congested-game-fixture-results-from-the-pro-football-study
#20
Athanasios Poulios, Ioannis G Fatouros, Magni Mohr, Dimitrios K Draganidis, Chariklia Deli, Konstantinos Papanikolaou, Apostolos Sovatzidis, Theofano Nakopoulou, Georgios Ermidis, Theofanis Tzatzakis, Vasiliki C Laschou, Kalliopi Georgakouli, Agisilaos Koulouris, Panagiotis Tsimeas, Athanasios Chatzinikolaou, Leonidas G Karagounis, Dimitrios Batsilas, Peter Krustrup, Athanasios Z Jamurtas
The effects of protein supplementation on performance recovery and inflammatory responses during a simulated one-week in-season microcycle with two games (G1, G2) performed three days apart were examined. Twenty football players participated in two trials, receiving either milk protein concentrate (1.15 and 0.26 g/kg on game and training days, respectively) (PRO) or an energy-matched placebo (1.37 and 0.31 g/kg of carbohydrate on game and training days, respectively) (PLA) according to a randomized, repeated-measures, crossover, double-blind design...
April 16, 2018: Nutrients
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