Download or read book Biomechanics of the Lower Extremity During a Single Leg Drop Landing written by Lori L. Webster-Dahl and published by . This book was released on 2006 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lower Extremity Biomechanics During Single Leg Drop Landings in Individuals with Patellofemoral Pain written by Stacey L. Gaven and published by . This book was released on 2013 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Limb Differences in Lower Extremity Biomechanics During a Drop landing and Cutting written by Derek J. Eversley and published by . This book was released on 2015 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Loaded Drop Landings on Lower Extremity Biomechanics in College ROTC Cadets written by Allen L. Redinger and published by . This book was released on 2020 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lower extremity musculoskeletal injuries are a common occurrence that can threaten deployment, completion of duty, and quality of life for a soldier. Repetitive activities, explosive movements, impact forces, and extreme joint angles all increase risk for injury and are often found in military physical training. Addition of external loading is necessary for combat situations and can lead to biomechanical alterations in gait, landing, and reactive forces, even at small bodyweight-relative loads. Although external load might not be able to be manipulated, individual strength levels and appropriate landing technique may reduce the relative risk for injury. The purpose of this study was to determine how a combat-relative body-borne loads can affect lower extremity biomechanics in Reserve Officers' Training Core cadets utilizing 3D motion capture and in-ground force plate analysis. Twenty-five college-aged Ohio University Reserve Officer's Training Core cadets and military personnel conducted two series of three consecutive jump landings from a 30cm high box placed half their height from the landing position on two force plates. The testing series consisted of an unweighted baseline condition and a weighted condition of 35% of their bodyweight added to their person by the way of a tactical weighted vest. Unloaded baseline and weighted conditions were compared using a paired t-test and 95% confidence intervals (p

Download or read book Sex Specific Neuromuscular and Kinematic Analysis of Unanticipated Single leg Landings In Young Athletes written by Nicholas Romanchuk and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the higher incidence of anterior cruciate ligament injuries in pediatric female populations, limited research has investigated sex-differences in youth biomechanics. Furthermore, research involving jump mechanics typically requires participant to follow a set protocol, such as sticking the landing. To reduce variability and improve reliability, trails where participants fail to meet the required protocol are discarded; however, significant clinical findings may be elucidated from these trials. The purpose of this thesis was to provide a complete biomechanical analysis of unanticipated single-leg drop-jump landings in youth athletes. Thirty-two healthy youth athletes completed unanticipated single-leg drop-jump landings on their dominant limb. Trials where participants shifted foot position or touched the ground with the contralateral leg were categorized as failed. Drop-jump landings were time-normalized using landmarks within the drop-jump task. Statistical parametric mapping (SPM) determined time-varying sex-differences in muscle onset time, co-activation, kinematics and kinetics. Wilcoxon signed-rank tests and paired sample t-tests compared lower-limb kinematics, centre-of-mass excursion and muscle activation amplitudes during the successful and failed landings. A logistic regression model was also fit to predict the likelihood of a successful landing. SPM identified significantly greater trunk flexion angle in males during the deceleration, flight, and landing phase of the drop-jump. Greater quadriceps-gastrocnemius co-activation was identified during the flight phase in female participants and independent sample t-test identified longer muscle onset time in the vastus lateralis of male participants. When comparing failed and successful landings greater hip abduction and less external rotation angles were observed during the successful trials. In addition, greater preparatory muscle activation was observed in the rectus femoris and semitendinosus during the flight phase of the failed landings. A logistic regression model, which included eight kinematic and neuromuscular variables, offered a training classification accuracy of 70% and a leave-one-out cross-validation accuracy of 65%. In conclusion, females land in a more erect posture and may be less effective at dissipating landing forces. In addition, greater co-activation and shorter pre-activations of the lower limb musculature may indicate a less effective muscle activation strategy in females. Furthermore, hip kinematics and the surrounding musculature play an important role in controlling successful and failed unanticipated landings. The variables included in the logistic regression model indicate which key factors are linked to landing a jump successfully. Training modalities aimed at improving landing mechanics should therefore focus on modifying these variables.

Download or read book The Effect of Quadriceps Strength Symmetry and Task Demands on Lower Extremity Biomechanics written by Michael Hoff and published by . This book was released on 2020 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anterior cruciate ligament (ACL) ruptures are a common injury in sports with short and long term consequences. Second ACL injury rates, defined as an injury to the contralateral or healthy limb, or a re-graft tear of the reconstructed ACL, are on the rise and can range from 24-49%. Previous literature suggests that quadriceps strength limb symmetry index (LSI) is a predictor of second ACL injury after returning to sport. Since single leg hop tests have been shown to not be a predictor of future second ACL injuries, using a functional task with systematically increased demands may help identify strength asymmetry thresholds at which ACLR individuals lose the ability to biomechanically adapt and present movement profiles that may increase risk for a second ACL injury. Specific to this thesis project, we hypothesized that: 1) ACL reconstructed (ACLR) individuals with [less-than]90% quadriceps strength LSI would exhibit biomechanical asymmetries regardless of task demands compared to ACLR individuals with 3?90% quadriceps strength LSI and healthy controls. 2) ACLR individuals with 3?90% quadriceps strength LSI would exhibit biomechanical asymmetries but only when task demands are highest compared to healthy controls. The two purposes of this study are to determine: 1) the effects of quadriceps strength symmetry and task demands on lower extremity biomechanics in ACLR and healthy controls, 2) evaluate asymmetries in single leg tasks. Data was collected on 10 healthy controls and 10 ACLR individuals that were all physically active and scored on the Tegner survey. All participants were asked to complete three hopping tasks commonly used in return to sport testing: the single leg hop for distance, the triple leg hop for distance, and the 6- meter timed hop. Quadriceps strength was measured using a dynamometer and the results determined our two ACLR groups: ACLR LSI 3?90% and ACLR LSI [less-than]90%. Participants performed three vertical drop jumps each from box heights of 30cm, 45cm, and 60cm. Additionally, participants performed single leg landing and single leg takeoff hops targeting 75% of their maximum single leg hop distance obtained earlier in the protocol. The ACLR LSI [less-than]90% group displayed biomechanical asymmetries during both the drop jump and single leg hopping tasks. The uninjured limb of the ACLR LSI [less-than]90% group displayed significantly higher knee adduction torques upon initial contact with the forceplate compared to the healthy matched control limbs at 30cm and 60cm heights, and ACLR LSI3?90% uninjured limbs at all three landing heights (p=0.018, observed power=0.81). During the single leg hopping trials, the ACLR LSI [less-than]90% group displayed a reduction in quadriceps efforts in their injured limb vs non-injured limb as demonstrated by reduced knee energy generation (hop landing) and absorption (hop takeoff), while also maintaining similar ground reaction forces during both single leg landing and takeoff trials (p=0.005, observed power= 0.90). The current thesis had several limitations that could have masked the results obtained: 1) the ACLR groups had small sample sizes, 2) the Tegner scale scores were statistically different between groups with the highest level of activity present in the ACLR LSI [less-than]90% group. Overall, ACLR LSI [less-than]90% exhibited movement characteristics in both the double leg drop jumps and single leg hopping tasks that suggest they are at heightened risk for a second ACL injury. Future research efforts should substantiate these findings as well as attempt to explain why these movement compensations occur post- ACL reconstruction.

Download or read book Effect of Ankle Taping on Lower Extremity Biomechanics During Drop Landings written by Michael J. Gale and published by . This book was released on 2002 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Asymmetry in Lower Extremity Biomechanics During Dual limb Landings written by Behrang Behjoo and published by . This book was released on 2014 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: PURPOSE: The main objective of this study was to compare energy absorption and power production between the preferred and non-preferred lower limb during a drop jump tasks. METHODS: A total of 44 active subjects (22 males, 22 females) participated. Energy absorption and power production were measured for both lower limbs during five 0.45 m drop jumps. Two separate repeated measures ANOVAs compared energy absorption during the landing phase, and power production during the propulsion phase between the two limbs. RESULTS: There was a main effect of limb (P

Download or read book Biomechanical Response of the Leg to Single Leg Drop Landings Before and After Prolonged Plantar Flexor Stretch written by Himadri H. Patel and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research is to observe the biomechanical response of the leg to singleleg drop landings after a prolonged plantar flexor stretch of 10 min.

Download or read book The Effect of Distraction on Female Lower Limb Biomechanics During a Drop Jump Landing Relevance to Preventing Anterior Cruciate Ligament ACL Injuries written by Hannah L. Price and published by . This book was released on 2015 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Basketball Sports Medicine and Science written by Lior Laver and published by Springer Nature. This book was released on 2020-10-05 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed as a comprehensive educational resource not only for basketball medical caregivers and scientists but for all basketball personnel. Written by a multidisciplinary team of leading experts in their fields, it provides information and guidance on injury prevention, injury management, and rehabilitation for physicians, physical therapists, athletic trainers, rehabilitation specialists, conditioning trainers, and coaches. All commonly encountered injuries and a variety of situations and scenarios specific to basketball are covered with the aid of more than 200 color photos and illustrations. Basketball Sports Medicine and Science is published in collaboration with ESSKA and will represent a superb, comprehensive educational resource. It is further hoped that the book will serve as a link between the different disciplines and modalities involved in basketball care, creating a common language and improving communication within the team staff and environment.

Download or read book A Comparison of Lower Extremity Kinematics Between One and Two leg Drop Landings written by Saori Hanaki and published by . This book was released on 2005 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Differences in Lower Limb Kinematics Between Female Athletes and Non athletes During Bilateral Landing Tasks and Single Leg Step downs written by Tamara Emeline Tompkins and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: Specific movement patterns at the hip, knee and ankle during dynamic landing tasks have been associated with an increased risk of lower extremity injury. Training strategies have shown to be favourable in decreasing the risk of injury through addressing movement patterns that have been associated with increased injury risk. Objective: To determine differences in lower limb kinematics during three separate bilateral landing tasks (Drop Jump, Drop Landing, Slow Step Down) between female athletes and non-athletes. Methods: Lower extremity kinematic data were obtained using the Xsens MVN motion capture system for 12 university athletes, and 14 university non-athletes. Three-dimensional joint angles were determined for the hip, knee, and ankle at the instant of landing, and peak angles were determined throughout both landings. Peak angular velocities of the hip, knee and ankle joints, and minimum distance between the knees were found during landing. Jumping variables including jump height, ground contact time, flight time, reactive strength index, landing knee distance, minimum knee distance, and landing ankle distance were also analyzed. Results: The athletes, in general, landed with less plantarflexion at the ankle (p

Download or read book Changes in Lower Extremity Landing Biomechanics Resulting from Fatigue written by Michael Lawrence Madigan and published by . This book was released on 2001 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book EMG Methods for Evaluating Muscle and Nerve Function written by Mark Schwartz and published by BoD – Books on Demand. This book was released on 2012-01-11 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first of two volumes on EMG (Electromyography) covers a wide range of subjects, from Principles and Methods, Signal Processing, Diagnostics, Evoked Potentials, to EMG in combination with other technologies and New Frontiers in Research and Technology. The authors vary in their approach to their subjects, from reviews of the field, to experimental studies with exciting new findings. The authors review the literature related to the use of surface electromyography (SEMG) parameters for measuring muscle function and fatigue to the limitations of different analysis and processing techniques. The final section on new frontiers in research and technology describes new applications where electromyography is employed as a means for humans to control electromechanical systems, water surface electromyography, scanning electromyography, EMG measures in orthodontic appliances, and in the ophthalmological field. These original approaches to the use of EMG measurement provide a bridge to the second volume on clinical applications of EMG.

Download or read book The Influence of Residual Fatigue on Lower Limb Stiffness During Jump Landing written by Lindsay Victoria Slater and published by . This book was released on 2010 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Anterior cruciate ligament (ACL) injuries have become commonplace among female athletes in today's society. With more than 70% of injuries resulting from noncontact mechanisms such as jump landing, the relationship between fatigue and altered movements patterns has become an important topic of research. Purpose: The main purpose of this study was to investigate the influence of residual fatigue on lower extremity kinematics and vertical leg stiffness at landing as experienced by female athletes. Method: The participants in this study were 12 NCAA female intercollegiate soccer players. Participants completed five single-leg drop jumps on their dominant leg every day for 4 days. The first day was completed without intervention to obtain pre-fatigue data and drop jumps on days two through four were completed after a fatigue protocol. Results: A repeated measures MANOVA did not reveal significant differences in post-fatigue peak knee flexion angle, vertical ground reaction forces, or vertical leg stiffness. Despite lack of statistical significance, vertical leg stiffness was increased during post-fatigue testing when compared to pre-fatigue values. Implications: The increased vertical leg stiffness may indicate altered landing techniques in post-fatigue states. If fatigue results in compromised movement patterns, it may explain the increased number of ACL injuries during the end of soccer matches. Suggestions for Future Research: Future research with a larger sample size should include post-fatigue dominant and nondominant leg comparison due to previous conflicting findings regarding which limb is most often injured. Future researchers should also quantify the magnitude of fatigue induced by the fatiguing protocol to document the strength of the independent variable.

Download or read book A Hybrid System for Simulation of Athletic Activities Related to Lower Extremity Biomechanics written by Cameron Trepeck and published by . This book was released on 2017 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, the design and development of a hybrid robotic system that simulates dynamic biomechanical tasds of the lower extremity with emphasis on knee and hip joints are presented. The hybrid system utilizes a mechanical hip and a cadaveric knee/ankle component and can accelerate the whole complex towards the ground. This system is used to simulate complex athletic movements such as landing from a jump at various anatomical orientations of the lower extremity with muscle action. The dynamic response of the lower extremity is monitored and analyzed during impulsive contact between the ground and the cadaveric leg. The cadaveric knee is instrumented to measure strain of the Anterior Cruciate Ligament (ACL) during simulated high impact sports activities. The mechanical hip allows various kinematics of the hip including flexion as well as abduction. In addition to the flexion and abduction of the mechanical hip, the controlled flexion and extension of the cadaveric knee allows for simulation of complex tasks such as landing from a jump. A large number of tests were performed at various anatomical positions utilizing this device to simulate landing from a jump. ACL strain was measured during these tasks using a Differential Variance Resistance Transducer (DVRT). Ground Reaction Force and muscle forces were measured and monitored using AmCell load cells recorded using LabView software. One-inch and 6-inch jump landing heights were used for all the simulations. The tests were performed at differing angles of hip flexion and at two different ankle positions. Plantar flexion and flat-footed landing conditions were simulated and compared in all degrees of hip flexion. These tests were repeated with and without hip abduction in order to study the effects of these landing positioins on ACL strain. Hip flexion was found to effect ACL strain : as angle of hip flexion increases, ACL strain decreases. This occurred in both small-drop heights, while hip abducted and non-abducted hip positions. Ankle landing position had an effect only in small drop heights, while hip abduction had an effect in large drops. Future tests must be completed to further study these effects. These studies showed that the robotic system can simulate dynamic tasks, apply muscle forces, and move the casdaveric tissue in three dimensional biomechanical positions.