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Hop kinematic

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https://www.readbyqxmd.com/read/28337590/acl-reconstructed-and-acl-deficient-individuals-show-differentiated-trunk-hip-and-knee-kinematics-during-vertical-hops-more-than-20%C3%A2-years-post-injury
#1
Jonas L Markström, Eva Tengman, Charlotte K Häger
PURPOSE: Little is known regarding movement strategies in the long term following injury of the anterior cruciate ligament (ACL), and even less about comparisons of reconstructed and deficient knees in relation to healthy controls. The present purpose was to compare trunk, hip, and knee kinematics during a one-leg vertical hop (VH) ~20 years post-ACL injury between persons treated with surgery and physiotherapy (ACLR), solely physiotherapy (ACLPT), and controls (CTRL). Between-leg kinematic differences within groups were also investigated...
March 23, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28298066/effect-of-fatigue-protocols-on-lower-limb-neuromuscular-function-and-implications-for-anterior-cruciate-ligament-injury-prevention-training
#2
Sue D Barber-Westin, Frank R Noyes
BACKGROUND: Approximately two-thirds of anterior cruciate ligament (ACL) tears are sustained during noncontact situations when an athlete is cutting, pivoting, decelerating, or landing from a jump. Some investigators have postulated that fatigue may result in deleterious alterations in lower limb biomechanics during these activities that could increase the risk of noncontact ACL injuries. However, prior studies have noted a wide variation in fatigue protocols, athletic tasks studied, and effects of fatigue on lower limb kinetics and kinematics...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28291516/a-practical-solution-to-reduce-soft-tissue-artifact-error-at-the-knee-using-adaptive-kinematic-constraints
#3
Brigitte M Potvin, Mohammad S Shourijeh, Kenneth B Smale, Daniel L Benoit
Musculoskeletal modeling and simulations have vast potential in clinical and research fields, but face various challenges in representing the complexities of the human body. Soft tissue artifact from skin-mounted markers may lead to non-physiological representation of joint motions being used as inputs to models in simulations. To address this, we have developed adaptive joint constraints on five of the six degree of freedom of the knee joint based on in vivo tibiofemoral joint motions recorded during walking, hopping and cutting motions from subjects instrumented with intra-cortical pins inserted into their tibia and femur...
February 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28263394/conditioning-hops-increase-triceps-surae-muscle-force-and-achilles-tendon-strain-energy-in-the-stretch-shortening-cycle
#4
Jakob Kümmel, Neil J Cronin, Andreas Kramer, Janne Avela, Markus Gruber
Post-activation potentiation can improve athletic performance, but the underlying mechanisms are poorly understood. This study investigated the effect of conditioning hops on triceps surae muscle force and tendon strain and its contribution to potentiated stretch-shortening cycle (SSC) performance. Thirty-two subjects participated in two experiments. In both experiments, subjects performed three drop jumps (DJs) after prior conditioning with 10 maximal hops, three unconditioned DJs served as control. Ground reaction forces, kinematics, and triceps surae electromyographic activity were recorded...
March 6, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28259462/standardization-proposal-of-soft-tissue-artefact-description-for-data-sharing-in-human-motion-measurements
#5
Andrea Cereatti, Tecla Bonci, Massoud Akbarshahi, Kamiar Aminian, Arnaud Barré, Mickael Begon, Daniel L Benoit, Caecilia Charbonnier, Fabien Dal Maso, Silvia Fantozzi, Cheng-Chung Lin, Tung-Wu Lu, Marcus G Pandy, Rita Stagni, Antonie J van den Bogert, Valentina Camomilla
Soft tissue artefact (STA) represents one of the main obstacles for obtaining accurate and reliable skeletal kinematics from motion capture. Many studies have addressed this issue, yet there is no consensus on the best available bone pose estimator and the expected errors associated with relevant results. Furthermore, results obtained by different authors are difficult to compare due to the high variability and specificity of the phenomenon and the different metrics used to represent these data. Therefore, the aim of this study was twofold: firstly, to propose standards for description of STA; and secondly, to provide illustrative STA data samples for body segments in the upper and lower extremities and for a range of motor tasks specifically, level walking, stair ascent, sit-to-stand, hip- and knee-joint functional movements, cutting motion, running, hopping, arm elevation and functional upper-limb movements...
February 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28237187/comparative-assessment-of-knee-joint-models-used-in-multi-body-kinematics-optimisation-for-soft-tissue-artefact-compensation
#6
Vincent Richard, Aurelio Cappozzo, Raphaël Dumas
Estimating joint kinematics from skin-marker trajectories recorded using stereophotogrammetry is complicated by soft tissue artefact (STA), an inexorable source of error. One solution is to use a bone pose estimator based on multi-body kinematics optimisation (MKO) embedding joint constraints to compensate for STA. However, there is some debate over the effectiveness of this method. The present study aimed to quantitatively assess the degree of agreement between reference (i.e., artefact-free) knee joint kinematics and the same kinematics estimated using MKO embedding six different knee joint models...
January 31, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28186834/elevated-knee-joint-kinetics-and-reduced-ankle-kinetics-are-present-during-jogging-and-hopping-after-achilles-tendon-ruptures
#7
Richard W Willy, Annelie Brorsson, Hayley C Powell, John D Willson, Roy Tranberg, Karin Grävare Silbernagel
BACKGROUND: Deficits in plantarflexor function are common after an Achilles tendon rupture. These deficits may result in an altered distribution of joint loads during lower extremity tasks. HYPOTHESIS: We hypothesized that, regardless of treatment, the Achilles tendon-ruptured limb would exhibit deficits in ankle kinematics and joint power while exhibiting elevated knee joint power and patellofemoral joint loads during walking, jogging, and hopping. We further hypothesized that this loading pattern would be most evident during jogging and hopping...
February 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28108669/developmental-differences-in-dynamic-muscle-tendon-behavior-implications-for-movement-efficiency
#8
C M Waugh, T Korff, A J Blazevich
Children perform cyclic motor tasks less efficiently than adults, however the mechanisms underlying such differences are not fully understood. One mechanism that may contribute these age-related differences is a differential contribution of muscles and tendons to a given muscle tendon unit (MTU) excursion. The aims of this study were to a) compare muscle and tendon excursion between children and adults performing vertical hopping, and b) determine if children and adults choose a hopping frequency that maximizes movement efficiency, based on the utilization of energy-saving mechanisms...
January 20, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#9
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27900192/vertical-stiffness-is-not-related-to-anterior-cruciate-ligament-elongation-in-professional-rugby-union-players
#10
Benjamin G Serpell, Jennie M Scarvell, Mark R Pickering, Nick B Ball, Diana Perriman, John Warmenhoven, Paul N Smith
BACKGROUND: Novel research surrounding anterior cruciate ligament (ACL) injury is necessary because ACL injury rates have remained unchanged for several decades. An area of ACL risk mitigation which has not been well researched relates to vertical stiffness. The relationship between increased vertical stiffness and increased ground reaction force suggests that vertical stiffness may be related to ACL injury risk. However, given that increased dynamic knee joint stability has been shown to be associated with vertical stiffness, it is possible that modification of vertical stiffness could help to protect against injury...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27895052/evidence-toads-may-modulate-landing-preparation-without-predicting-impact-time
#11
S M Cox, Gary Gillis
Within anurans (frogs and toads), cane toads (Bufo marinus) perform particularly controlled landings in which the forelimbs are exclusively used to decelerate and stabilize the body after impact. Here we explore how toads achieve dynamic stability across a wide range of landing conditions. Specifically, we suggest that torques during landing could be reduced by aligning forelimbs with the body's instantaneous velocity vector at impact (impact angle). To test whether toad forelimb orientation varies with landing conditions, we used high-speed video to collect forelimb and body kinematic data from six animals hopping off platforms of different heights (0, 5 and 9 cm)...
January 15, 2017: Biology Open
https://www.readbyqxmd.com/read/27872403/biomechanical-analysis-of-weighted-ball-exercises-for-baseball-pitchers
#12
Glenn S Fleisig, Alek Z Diffendaffer, Kyle T Aune, Brett Ivey, Walter A Laughlin
BACKGROUND: Weighted-ball throwing programs are commonly used in training baseball pitchers to increase ball velocity. The purpose of this study was to compare kinematics and kinetics among weighted-ball exercises with values from standard pitching (ie, pitching standard 5-oz baseballs from a mound). HYPOTHESIS: Ball and arm velocities would be greater with lighter balls and joint kinetics would be greater with heavier balls. STUDY DESIGN: Controlled laboratory study...
November 21, 2016: Sports Health
https://www.readbyqxmd.com/read/27799670/correlation-between-hip-function-and-knee-kinematics-evaluated-by-three-dimensional-motion-analysis-during-lateral-and-medial-side-hopping
#13
Hiromitsu Itoh, Kohei Takiguchi, Yohei Shibata, Satoshi Okubo, Shinichi Yoshiya, Ryosuke Kuroda
[Purpose] Kinematic and kinetic characteristics of the limb during side-hopping and hip/knee interaction during this motion have not been clarified. The purposes of this study were to examine the biomechanical parameters of the knee during side hop and analyze its relationship with clinical measurements of hip function. [Subjects and Methods] Eleven male college rugby players were included. A three-dimensional motion analysis system was used to assess motion characteristics of the knee during side hop. In addition, hip range of motion and muscle strength were evaluated...
September 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27770784/effects-of-two-neuromuscular-training-programs-on-running-biomechanics-with-load-carriage-a-study-protocol-for-a-randomised-controlled-trial
#14
Bernard X W Liew, Susan Morris, Justin W L Keogh, Brendyn Appleby, Kevin Netto
BACKGROUND: In recent years, athletes have ventured into ultra-endurance and adventure racing events, which tests their ability to race, navigate, and survive. These events often require race participants to carry some form of load, to bear equipment for navigation and survival purposes. Previous studies have reported specific alterations in biomechanics when running with load which potentially influence running performance and injury risk. We hypothesize that a biomechanically informed neuromuscular training program would optimize running mechanics during load carriage to a greater extent than a generic strength training program...
October 22, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27699696/neuromechanical-modulation-of-the-achilles-tendon-during-bilateral-hopping-in-patients-with-unilateral-achilles-tendon-rupture-over-1-year-after-surgical-repair
#15
Hiroyuki Oda, Kanae Sano, Yoko Kunimasa, Paavo V Komi, Masaki Ishikawa
BACKGROUND: Patients who have had an Achilles tendon (AT) rupture repaired are potentially at higher risk for re-rupture than those without previous rupture. Little attention has been given to the neuromechanical modulation of muscle-tendon interaction and muscle activation profiles during human dynamic movements after AT rupture repair. OBJECTIVE: The purpose of this study was to examine muscle-tendon behavior and muscle activation during bilateral hopping. METHODS: We enrolled nine subjects who had undergone surgical repair of unilateral AT rupture within the past 1-2 years...
October 3, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27632850/eccentric-loading-of-triceps-surae-modulates-stretch-shortening-cycle-behaviour-a-possible-therapeutic-mechanism
#16
James R Debenham, William I Gibson, Mervyn J Travers, Amity C Campbell, Garry T Allison
CONTEXT: Eccentric exercises are increasingly being used to treat lower limb musculoskeletal conditions such as Achilles tendinopathy. Despite widespread clinical application and documented efficacy, mechanisms underpinning clinical benefit remain unclear. Positive adaptations in motor performance are one potential mechanism. OBJECTIVE: To investigate how an eccentric loading intervention influences measures of stretch-shortening cycle (SSC) behaviour during a hopping task...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27614614/characteristics-and-adaptive-strategies-linked-with-falls-in-stroke-survivors-from-analysis-of-laboratory-induced-falls
#17
Claire F Honeycutt, Masood Nevisipour, Mark D Grabiner
Falls are the most common and expensive medical complication in stroke survivors. There is remarkably little information about what factors lead to a fall in stroke survivors. With few exceptions, the falls literature in stroke has focused on relating metrics of static balance and impairment to fall outcomes in the acute care setting or in community. While informative, these studies provide little information about what specific impairments in a stroke-survivor's response to dynamic balance challenges lead to a fall...
October 3, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27470227/kinematic-and-electromyographic-analysis-in-patients-with-patellofemoral-pain-syndrome-during-single-leg-triple-hop-test
#18
Marcelo Martins Kalytczak, Paulo Roberto Garcia Lucareli, Amir Curcio Dos Reis, André Serra Bley, Daniela Aparecida Biasotto-Gonzalez, João Carlos Ferrari Correa, Fabiano Politti
Possible delays in pre-activation or deficiencies in the activity of the dynamic muscle stabilizers of the knee and hip joints are the most common causes of the patellofemoral pain syndrome (PFPS). The aim of the study was to compare kinematic variables and electromyographic activity of the vastus lateralis, biceps femoris, gluteus maximus and gluteus medius muscles between patients with PFPS and health subjects during the single leg triple hop test (SLTHT). This study included 14 female with PFPS (PFPS group) and 14 female healthy with no history of knee pain (Healthy group)...
September 2016: Gait & Posture
https://www.readbyqxmd.com/read/27362587/medial-gastrocnemius-muscle-tendon-interaction-and-architecture-change-during-exhaustive-hopping-exercise
#19
Daniel E Lidstone, Herman van Werkhoven, Justin A Stewart, Reed Gurchiek, Madison Burris, Paige Rice, Garrett Feimster, Jeffrey M McBride
BACKGROUND: Previous literature has shown in vivo changes in muscle-tendon interaction during exhaustive stretch-shortening cycle (SSC) exercise. It is unclear whether these changes in muscle-tendon length during exhaustive SSC exercise are associated with changes in mechanical efficiency (ME). The purpose of the study was to investigate whether changes in platarflexor contractile component (CC) length, tendon length, and changes in plantarflexor muscle activity could explain reduction in ME during exhaustive SSC exercise...
October 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27280324/influence-of-a-knee-brace-intervention-on-perceived-pain-and-patellofemoral-loading-in-recreational-athletes
#20
Jonathan K Sinclair, James Selfe, Paul J Taylor, Hannah F Shore, Jim D Richards
BACKGROUND: The current investigation aimed to investigate the effects of an intervention using knee bracing on pain symptoms and patellofemoral loading in male and female recreational athletes. METHODS: Twenty participants (11 males & 9 females) with patellofemoral pain were provided with a knee brace which they wore for a period of 2weeks. Lower extremity kinematics and patellofemoral loading were obtained during three sport specific tasks, jog, cut and single leg hop...
August 2016: Clinical Biomechanics
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