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Book The Effects of Landing on Lower Extremity Function

Download or read book The Effects of Landing on Lower Extremity Function written by Janet Sue Dufek and published by . This book was released on 1988 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effects of a Functional Fatigue Protocol on Landing Kinetics and Kinematics of the Lower Extremity

Download or read book The Effects of a Functional Fatigue Protocol on Landing Kinetics and Kinematics of the Lower Extremity written by Ashley S. Long and published by . This book was released on 2005 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussion. Significant changes in time to peak GRF, time to peak of maximum knee flexion, muscle activation and temporal patterning may suggest a kinematic difference in landing form in a fatigued state.

Book The Effects of Loaded Drop Landings on Lower Extremity Biomechanics in College ROTC Cadets

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

Book Effects of Decision Making on Landing Neuromechanics as a Function of Task and Sex

Download or read book Effects of Decision Making on Landing Neuromechanics as a Function of Task and Sex written by Melissa A. Mache and published by . This book was released on 2010 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the incidence of non-contact anterior cruciate ligament (ACL) injuries is greater among women than men athletes, the factors that contribute to this greater risk of injury are not well understood. One relevant question is whether decision making during landing influences the biomechanical and neuromuscular factors thought to contribute to ACL injury, and whether these effects differ as a function of task and sex. The purpose of this study was thus to examine the effects of decision making on the neuromechanics of two-footed landing tasks in women and men. Twenty-nine healthy young adults (13 women; 16 men) completed a series of two-footed drop landing and drop-jump tasks under preplanned and decision-making conditions. Biomechanical and electromyographic data were collected. Repeated measures ANOVA was used to determine the effect of decision making on hip, knee, and ankle kinematics and kinetics, and on proactive and reactive muscle activity, as a function of task and sex. Multiple linear regression was used to assess the relationship between select knee biomechanical variables and proactive muscle activity. Decision making had numerous effects on lower extremity kinematics, kinetics, and neuromuscular control, many of which were task-specific. Under decision-making conditions, individuals exhibited similar joint postures at initial ground contact and similar amounts of reactive muscle activity across tasks. The majority of the observed modifications in neuromechanics suggested a default towards the preplanned drop landing strategy under decision-making conditions. Some effects of decision making on joint mechanics and reactive muscle activity varied with sex, although the extent to which these dissimilar effects modified relative ACL loading is not known. Knee flexion at initial contact, peak knee abduction, and peak knee adduction moment were significantly related to the proactive activity of several, primarily lateral, muscles of the lower extremity, independent of task and decision-making condition. These results indicate that decision making influences landing mechanics and neuromuscular control and that these effects are generally task-dependent and, in some cases, sex-dependent. The results also suggest that, in both women and men, drop landings and drop-jumps performed under decision-making conditions are no more dangerous, with respect to ACL loading, than preplanned drop landings.

Book The Effect of Lower Extremity Fatigue on Shock Attenuation During Landing

Download or read book The Effect of Lower Extremity Fatigue on Shock Attenuation During Landing written by Evan Coventry and published by . This book was released on 2004 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Examination of Lower Extremity Mechanics During Three Landing Tasks and Injury Prediction Ability of Those Models as Compared to a Functional Test

Download or read book Examination of Lower Extremity Mechanics During Three Landing Tasks and Injury Prediction Ability of Those Models as Compared to a Functional Test written by Timothy George Coffey and published by . This book was released on 2015 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anterior cruciate ligament (ACL) ruptures are one of the most common knee ligament injuries suffered by both male and female athletes. These injuries are severe in nature and also have long-term impacts on activities of daily living. Significant research has been conducted utilizing a drop landing task to attempt to better understand the mechanics behind the injury and to help identify at-risk athletes for targeted intervention. However, there have not been any published standards for the height of the drop landing activity, and previous researchers have also raised some concerns about the ability of a drop landing task to replicate the landing mechanics of a sport-specific task. To examine possible differences in performance based on specific landing tasks, the first study compared the landing mechanics of male and female high school athletes in three different landing conditions (drop landing, DL; adjusted height drop landing, AHDL; and a vertical jump task, VJL) (Chapter 3). Thirty-seven (37) athletes completed bilateral landings in the three conditions, and their kinetic and kinematic landing mechanics were compared across conditions. For the male participants, maximum knee flexion during landing was greater in AHDL condition as compared to the DL and VJL conditions. Both male and female participants demonstrated greater hip adduction at impact and overall maximum value in the VJL condition as compared to the two drop landings. As drop landing tasks have been used to identify at-risk athletes, it was important to examine the three different tasks' ability to predict lower extremity ligamentous injuries, and whether those 3D motion analysis predictors were more precise than a quick clinical symmetry screening tool (Chapter 4). One-hundred-and-sixty-five (165) athletes completed the clinical symmetry screen, and a subgroup of thirty-seven (37) athletes completed the 3D motion analysis. All of these participants were surveyed for lower extremity ligamentous injuries over the course of a season. Due to a small number of reported injuries, none of the injury predictor models based on 3D motion analysis landing mechanics or the clinical symmetry screening tool were able to produce accurate predictor models of injury. Knee abduction moment has been shown to be one of the strongest predictors of ACL injuries, and due to the collection of bilateral kinetics for a previous study (Chapter 3), there was a need to examine differences in KAM between the three different landing tasks (Chapter 5). Ten (10) recreational athletes completed bilateral landings in the three conditions, with foot placement relative to force plates to enable KAM calculation. The participants did not demonstrate any difference in KAM between the three landing conditions; however, a test for constant variance showed that the AHDL resulted in significantly less variance in KAM than DL or VJL. The results of these studies suggest that while easy to standardize, a set height drop landing task does not produce identical landing mechanics to those from an adjusted height drop landing task or a vertical jump task. Further research is needed to create or justify standardized landing tasks for researchers to utilize that produce consistent results that best duplicate the landing mechanics athletes performed during sporting activities. While the landing mechanics demonstrated in the three tasks and the results from the clinical screening were not able to predict injuries, future studies should examine quick clinical screening tools to identify athletes at a high risk of injury.

Book Dynamic Lower Extremity Function

Download or read book Dynamic Lower Extremity Function written by Rush Frederick Green and published by . This book was released on 1990 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effect of Limb Dominance on Lower Extremity Biomechanics when Landing from a Jump

Download or read book Effect of Limb Dominance on Lower Extremity Biomechanics when Landing from a Jump written by Jennifer A. Spencer and published by . This book was released on 2015 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effect of Feedback Training on the Landing Error Scoring System

Download or read book The Effect of Feedback Training on the Landing Error Scoring System written by Sara C. Doebel and published by . This book was released on 2012 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Context: Suboptimal lower extremity biomechanics during jump-landing may lead to various lower extremity joint injuries. Verbal feedback has been used previously to positively alter landing biomechanics, yet the use of technology in an effort to allow for the participant to make real-time biomechanical adjustments during landing has not been evaluated. Objective: Determine the immediate effects of real-time feedback (RTF) and traditional feedback (TF) on Landing Error Scoring System (LESS) scores compared to a control condition, that performed jump-landing without any feedback. Design: Single blinded, randomized controlled trial. Setting: Research laboratory. Participants: Twenty-eight physically active female participants with no history of lower extremity injury volunteered and were randomized into 3 groups (RTF: n=9, age=20.0±1.4yrs, height=163.98±5.7cm, mass=65.4±9.5kg; TF: n=10, age=20.5±1.3yrs, height=166.12±6.4cm, mass=62.6±7.2kg; Control: n=9, age=21.0±2.1yrs, height=163.16±6.6cm, weight=64.8±17.8kg). Interventions: All participants completed three sets of six jump-landing trials (18 total) off a 30cm box. Participants in the RTF and TF groups were additionally provided standardized verbal feedback instructions from a single clinician after each set. In addition to verbal feedback, participants in the RTF group were equipped with retroreflective markers positioned on the lower extremity. Using Cortex software and 3-dimentional Motion Analysis, markers on the middle of the patella and the dorsum of the great toe of the right limb were highlighted in color, and connected with a segment line. RTF participants were able to visualize their 3-dimensional model on a 107cm monitor, and were instructed to align the highlighted knee-foot segment with a stationary vertical reference line in the frontal plane during landing. Control participants received no feedback while performing the 18 box jumps. Main Outcome Measures: All participants performed the LESS testing protocol at baseline and immediately following the intervention consisting of a forward jump off a 30cm box transitioning into a maximal vertical jump. Trials were recorded in the frontal and sagittal planes using two-dimensional video and evaluated with the LESS scoring criteria by two blinded independent assessors. Delta scores from baseline were calculated for all three groups. Independent t-tests and effect sizes (Cohen's d) were performed to assess change scores in the LESS for specific comparisons (TF v. control; RTF v. control). Alpha was set at p

Book The Effect of Load on the Kinetics and Kinematics of the Lower Extremity During Landing

Download or read book The Effect of Load on the Kinetics and Kinematics of the Lower Extremity During Landing written by Michael Sullivan and published by . This book was released on 2021 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose: To understand the differences in the lower extremity kinetics and kinematics as load increases during jump landings. Methods: Ten male participants (20.4 years ℗ł 2.41 years, 108.8kg ℗ł 14.02kg) took part in two testing sessions. The first testing session involved testing each participant's 1-repetition max in the hexagonal barbell deadlift. The second testing session involved the data collection of the jumping trials for each participant. Participants performed their countermovement jumps under seven randomized conditions. Six of the conditions involved the hex bar using loads equivalent to 10, 20, 30, 40, 50, and 60% estimated 1-repetition max of the hexagonal barbell deadlift. The seventh condition was an unloaded (bodyweight or 0%) countermovement jump. Peak values for joint powers, moments, angles, and velocities were recorded for the ankle, knee, and hip for all participants and conditions. A repeated measures ANOVA was used to compare differences among results. Results: Significant differences (p

Book Research Methods in Biomechanics 2E

Download or read book Research Methods in Biomechanics 2E written by Gordon Robertson and published by Human Kinetics. This book was released on 2013-09-25 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailing up-to-date research technologies and approaches, Research Methods in Biomechanics, Second Edition, assists both beginning and experienced researchers in developing methods for analyzing and quantifying human movement.

Book Components of Neuromuscular Control on Lower Extremity Musculoskeletal Injury and Cardiovascular Function in the Warfighter

Download or read book Components of Neuromuscular Control on Lower Extremity Musculoskeletal Injury and Cardiovascular Function in the Warfighter written by Cody Butler and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective from the Air Force regarding my PhD experience was to gain a wide variety of experiences and competencies in injury prevention and maximizing human performance. To this end, my committee and I decided to undertake three unique, diverse chapters for my dissertation: cardiovascular (CV) function following anterior cruciate ligament reconstruction (ACLR), a global movement screen to predict patellofemoral pain (PFP), and the effects of heat and dehydration on static balance. Each chapter, although different and unique, had topics very relevant to Air Force medicine and research. With the common thread of neuromuscular control, these chapters built upon my Physical Therapy background and helped me gain both diverse experiences that the Air Force requested (objective 1), and the expertise expected from my committee (objective 2), as part of a PhD experience. The purpose of this dissertation is to demonstrate competency and expertise in components of neuromuscular control on lower extremity musculoskeletal injury and cardiovascular function in the warfighter. In the ACLR chapter, markers of arterial stiffness, aerobic capacity and quadriceps muscle strength were investigated in individuals following ACLR. In the PFP chapter, the Landing Error Scoring System was used to ascertain risk factors from a global movement screen in developing PFP. Finally, in the heat chapter, the effects of various environmental and conditional stressors on static balance was explored. The findings from these chapters, and the manuscript write-ups, demonstrate that both primary objectives were met.