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 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 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 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 The Effects of Height and Post landing Movement Task on Lower Extremity Landing Biomechanics written by Brian Lynn Caster and published by . This book was released on 1996 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The effects of height and post landaing movement task on lower extremity landing biomechanics written by Brian Lynn Caster and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Lower Extremity Kinematics and Kinetics of a Drop Landing written by Sean B. Murphy and published by . This book was released on 1998 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Injury Prevention Programs on Balance and Landing Biomechanics written by Joel Tenbrink and published by . This book was released on 2012 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is good evidence that prevention programs are beneficial in reducing injuries and improving landing mechanics. Several prevention programs have been developed to prevent lower extremity injuries. These programs have primarily focused on increasing agility, strength and balance for injury prevention since deficiencies of these components have been identified as predictors of anterior cruciate ligament (ACL) injury. Given documented evidence of the benefit of proprioceptive training on ACL injury rates in soccer, our objective was to determine the influence of an injury prevention program designed for soccer on balance and lower extremity landing mechanics. Our hypothesis was that individuals who participated in a neuromuscular training program gained superior stability and ability to attenuate forces during a balance task. Further, we hypothesize that individuals who participated in a neuromuscular training prevention program improved their landing mechanics, demonstrated by hip and knee positions coming into ranges that do not predispose them to injury. We also hypothesize that individuals who participated in an ACL injury prevention program demonstrate improvements in a bent knee balance task, with no improvements in a straight knee balance task. We implemented two injury prevention programs, the FIFA 11+ program and the PEP program. Forty eight college-age participants were recruited and were then placed into one of three groups, either the FIFA 11+ group, the PEP group, or the control group. Kinetic measures were obtained on each subject using an eight camera Vicon motion capture system. Straight-knee and bent-knee balance measures were obtained on a Neurocom Balancemaster. Subjects were tested before participation in one of the training programs and after 6 weeks of training. Repeated measures ANOVA was performed on all variables for differences between test date and group. Significant improvements were seen in both the FIFA and Control group in hip flexion angles following the 6 weeks. All groups showed improvement in bent-knee balance measures and 4 of the 5 straight knee balance measures. While lacking statistical significance, improvements were seen. Trends toward improvement were seen most by participants in the FIFA 11+ group. Further testing with test measures of greater specificity should be used to determine the balance enhancements of these programs.

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:

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 The Effects of Ankle Taping on Lower Extremity Biomechanics During Unilateral Landing written by Sumie Ichizaki and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 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

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 Effects of Synthetic Turf and Shockpads on Impact Attenuation Related Biomechanics During Drop Landing written by Hang Qu and published by . This book was released on 2016 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthetic turf has been widely utilized in sports since 1964. Discrepancies, however, in injury incidence on synthetic turf and natural grass have been reported throughout studies. Adding a shock pad under synthetic turf carpet is claimed to aid in energy absorption and decrease impact loading. Although some studies have conducted materials tests and compared mechanical characteristics of synthetic turf with different shock pads, no studies have examined biomechanical characteristics of impact related human movements on an infilled synthetic turf system with different underlying shock pads. The purpose of this research was to investigate effects of an infilled synthetic turf with three shock pads of different energy absorption characteristics on impact attenuation related biomechanics of lower extremity during drop landing. Wearing running shoes, twelve active and healthy recreational male athletes performed five trials of drop landing from 60 cm with a controlled landing style (maximum knee flexion) on five surface conditions: a regular surface (force platform), an infilled synthetic turf, turf plus foam shock pad, turf plus a lower density shock pad, and turf plus a high density shock pad. A motion analysis system and force platform were utilized to collect kinematic and kinetic data. Furthermore, a mechanical test was conducted based on ASTM F355 standard. The turf plus shock pad systems resulted in lower 1st vertical peak ground reaction force (GRF) and its loading rates compared to synthetic turf without a shock pad. However, no differences in 2nd vertical GRF and joint kinematics and kinetics across surfaces were found. These results suggest that landing from 60 cm may cause a plateau effect in energy attenuation for the examined turf and turf plus shock pad systems. Future studies may be needed to explore the shock attenuation capacities of landing surfaces in landing activities from a lower height (