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https://www.readbyqxmd.com/read/29776312/on-the-prospects-of-using-high-intensity-thz-pulses-to-induce-ultrafast-temperature-jumps-in-liquid-water
#1
Pankaj Kr Mishra, Vincent Bettaque, Oriol Vendrell, Robin Santra, Ralph Welsch
Ultrashort, high-intensity THz pulses, e.g., created at free-electron laser facilities, allow for direct investigation as well as the driving of intermolecular modes in liquids like water and thus will deepen our understanding of the hydrogen bonding network. In this work, the temperature-jump (T-jump) of water induced by THz radiation is simulated for ten different THz frequencies in the range from 3 to 30 THz and five different pulse intensities in the range from 1 × 1011 to 5 × 1012 W/cm2 employing both ab initio molecular dynamics (AIMD) and force field molecular dynamics (FFMD) approaches...
May 18, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29770871/the-effects-of-acute-leucine-or-leucine-glutamine-co-ingestion-on-recovery-from-eccentrically-biased-exercise
#2
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/29769823/relationship-between-achilles-tendon-stiffness-and-ground-contact-time-during-drop-jumps
#3
Mohamed Abdelsattar, Andreas Konrad, Markus Tilp
The purpose of this study was to investigate the relationship between Achilles tendon stiffness and ground contact time (GCT) during drop jumps. The property of "springiness" and a short GCT during the movement is required in several types of sports. Therefore, a stiff tendon might be advantageous due to the quick force transmission from the muscle to the bone. Hence, a secondary aim was to relate Achilles tendon stiffness with squat jump (SJ) and counter movement jump (CMJ) performance, respectively...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29755359/commentary-trunk-muscle-activity-during-drop-jump-performance-in-adolescent-athletes-with-back-pain
#4
COMMENT
Thorvaldur S Palsson, J P Caneiro, Rogerio Pessoto Hirata, Derek Griffin, William Gibson, Mervyn J Travers
No abstract text is available yet for this article.
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29749751/visual-motor-control-of-drop-landing-after-anterior-cruciate-ligament-reconstruction
#5
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
#6
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/29739301/sub-elite-football-players-with-hip-related-groin-pain-and-positive-flexion-adduction-internal-rotation-test-exhibit-distinct-biomechanical-differences-compared-with-the-asymptomatic-side
#7
Matthew G King, Adam I Semciw, Harvi F Hart, Anthony G Schache, Kane J Middleton, Josh J Heerey, Rintje Agricola, Kay M Crossley
Study Design Observational cross-sectional study. Background Hip-related groin pain is common in sub-elite football players and may be associated with altered hip biomechanics. Objectives To compare the hip biomechanics, bony hip morphology associated with femoroacetabular impingement (FAI) syndrome, and hip strength and range of motion between the symptomatic and asymptomatic limb of sub-elite football players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test. Methods Fifteen sub-elite football (soccer) players with unilateral hip-related groin pain and a positive flexion adduction internal rotation test were recruited...
May 8, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29721781/implicit-video-feedback-produces-positive-changes-in-landing-mechanics
#8
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/29691618/patients-with-an-achilles-tendon-re-rupture-have-long-term-functional-deficits-in-function-and-worse-patient-reported-outcome-than-primary-ruptures
#9
Olof Westin, Katarina Nilsson Helander, Karin Grävare Silbernagel, Kristian Samuelsson, Annelie Brorsson, Jón Karlsson
PURPOSE: The aim of this study was to perform a long-term follow-up of patients treated for an Achilles tendon re-rupture, using established outcome measurements for tendon structure, lower extremity function and symptoms, and to compare the results with those for the uninjured side. A secondary aim was to compare the outcome with that of patients treated for primary ruptures. The hypotheses were that patients with a re-rupture recover well, and have similar long-term outcome as primary ruptures...
April 24, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29687012/sex-based-differences-of-medial-collateral-ligament-and-anterior-cruciate-ligament-strains-with-cadaveric-impact-simulations
#10
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
#11
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
#12
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/29659401/effects-of-different-footwear-properties-and-surface-instability-on-neuromuscular-activity-and-kinematics-during-jumping
#13
Melanie Lesinski, Olaf Prieske, Ron Borde, Rainer Beurskens, Urs Granacher
Lesinski, M, Prieske, O, Borde, R, Beurskens, R, and Granacher, U. Effects of different footwear properties and surface instability on neuromuscular activity and kinematics during jumping. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to examine sex-specific effects of different footwear properties vs. barefoot condition during the performance of drop jumps (DJs) on stable and unstable surfaces on measures of jump performance, electromyographic (EMG) activity, and knee joint kinematics...
April 13, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29652156/zipping-dewetting-dissolution-of-droplets-on-micropatterned-concentric-rings
#14
Jos Eacute Manuel Encarnaci Oacute N Escobar, Erik Dietrich, Steve Arscott, Harold J W Zandvliet, Xuehua Zhang, Detlef Lohse
The control of the surface wettability is of great interest for technological applica- tions as well as for the fundamental understanding of surface phenomena. In this paper we describe the dissolution behavior of droplets wetting a micro-patterned surface con- sisting of smooth concentric circular grooves. In the experiments, a droplet of alcohol (1-Pentanol) is placed onto water immersed micro-patterns. When the drops dissolve the dynamics of the receding contact line occurs in two different modes. In addition to the stick-jump mode with jumps from one ring to the next inner one, our study reveals a second dissolution mode, which we refer to as zipping-dewetting...
April 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29643592/does-trampoline-or-hard-surface-jumping-influence-lower-extremity-alignment
#15
Kiyokazu Akasaka, Akihiro Tamura, Aoi Katsuta, Ayako Sagawa, Takahiro Otsudo, Yu Okubo, Yutaka Sawada, Toby Hall
[Purpose] To determine whether repetitive trampoline or hard surface jumping affects lower extremity alignment on jump landing. [Subjects and Methods] Twenty healthy females participated in this study. All subjects performed a drop vertical jump before and after repeated maximum effort trampoline or hard surface jumping. A three-dimensional motion analysis system and two force plates were used to record lower extremity angles, moments, and vertical ground reaction force during drop vertical jumps. [Results] Knee extensor moment after trampoline jumping was greater than that after hard surface jumping...
December 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29628898/postactivation-potentiation-of-the-plantar-flexors-does-not-directly-translate-to-jump-performance-in-female-elite-young-soccer-players
#16
Olaf Prieske, Nicola A Maffiuletti, Urs Granacher
High-intensity muscle actions have the potential to temporarily improve muscle contractile properties (i.e., postactivation potentiation, PAP) thereby inducing acute performance enhancements. There is evidence that balance training can improve performance during strength exercises. Taking these findings together, the purpose of this study was to examine the acute effects of a combined balance and strength (B+S) exercise vs. a strength only (S) exercise on twitch contractile properties, maximum voluntary strength, and jump performance in young athletes...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29619793/effect-of-post-warm-up-resting-interval-on-static-and-dynamic-balance-and-maximal-muscle-strength-followed-by-the-fifa-11-and-dynamic-warm-up-exercises
#17
Yung-Sheng Chen, Wai-Lin Lai, Chein-Wen Hou, Che-Hsiu Chen, Yi-Wen Chiu, Pedro Bezzera
BACKGROUND: It has been reported that implementation of the FIFA11+ can immediately increase exercise performance. However, the elapsed time of post-warm up (WU) effect of the FIFA 11+ is unclear. METHODS: Twenty-two male university football players were randomly assigned into the FIFA 11+ (n =10) or control group (conventional dynamic WU exercise, n = 11). The participants performed static, drop jump, and maximal voluntary muscle contraction (MVC) tests before and after the WU protocol in four different occasions with 0, 10, 20 or 30 min resting interval...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29613821/lower-extremity-kinematics-differed-between-a-controlled-drop-jump-and-volleyball-takeoffs
#18
Bradley S Beardt, Myranda R McCollum, Taylour J Hinshaw, Jacob S Layer, Margaret A Wilson, Qin Zhu, Boyi Dai
Previous studies utilizing jump-landing biomechanics to predict anterior cruciate ligament injuries have shown inconsistent findings. The purpose of this study was to quantify the differences and correlations in jump-landing kinematics between a drop-jump, a controlled volleyball-takeoff, and a simulated-game volleyball-takeoff. Seventeen female volleyball players performed these three tasks on a volleyball court while three-dimensional kinematic data were collected by three calibrated camcorders. Participants demonstrated significantly increased jump height, shorter stance time, increased time differences in initial contact between two feet, increased knee and hip flexion at initial contact and decreased peak knee and hip flexion for both left and right legs, and decreased knee-ankle distance ratio at the lowest height of mid-hip for the two volleyball-takeoffs compared with the drop-jump (p < 0...
April 3, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29589412/the-validity-and-reliability-of-the-my-jump-2-app-for-measuring-the-reactive-strength-index-and-drop-jump-performance
#19
Tom Haynes, Chris Bishop, Mark Antrobus, Jon Brazier
BACKGROUND: This is the first study to independently assess the concurrent validity and reliability of the My Jump 2 app for measuring drop jump performance. It is also the first to evaluate the app's ability to measure the reactive strength index (RSI). METHODS: Fourteen male sport science students (age: 29.5 ± 9.9 years) performed three drop jumps from 20 cm and 40 cm (totalling 84 jumps), assessed via a force platform and the My Jump 2 app. Reported metrics included reactive strength index, jump height, ground contact time, and mean power...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29579620/ground-reaction-forces-during-a-drop-vertical-jump-impact-of-external-load-training
#20
Jeffrey D Simpson, Brandon L Miller, Eric K O'Neal, Harish Chander, Adam C Knight
External load training (ELT) is a supplemental training method used to potentially improve high intensity task performance. However, biomechanical parameters such as ground reaction forces (GRF), ground contact time, and time to peak GRF during a drop vertical jump (DVJ) following an ELT intervention have yet to be examined. Therefore, this study investigated the impact of ELT on certain biomechanical parameters of a DVJ task. Well-trained females stratified into two groups (ELT = 9, Control = 10) completed a DVJ from a 45...
March 23, 2018: Human Movement Science
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