Download or read book The Effects of Ankle Bracing and Landing Style on Vertical Ground Reaction Forces in Drop Landings written by Kirsten L. Kirby and published by . This book was released on 1993 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Ankle Braces on Ground Reaction Force During Drop Landings written by David J. Dominguese and published by . This book was released on 1999 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ground Reaction Forces During Drop Landings from Two Heights Using Different Ankle Braces written by Vicki M. Pittenger and published by . This book was released on 2002 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Ankle Bracing on Knee Joint Kinematics and Kinetics During Repeated Single Leg Hop and Drop Vertical Jump in High School Aged Girls written by Virginia Norene Christensen and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Ankle bracing has not been studied for its effects of knee joint kinematics and kinetics in the adolescent female athlete. Hypothesis: A) A statistically significant mean increase of knee joint valgus and extensor moments and valgus angles would be found in the braced group during the drop vertical jump and the single log hop tests and B) A statistically significant mean decrease in knee joint varus and extensor moments and valgus angles will be found between pre- and post-test acclimation periods in the braced condition. Study Design: Randomized Controlled Trial. Methods: Fifteen adolescent female athletes performed Drop Vertical Jump (DVJ) and Single Leg Hop (SLH) tests without ankle bracing and with a lace-up style ankle brace. Subjects wore braces over a 1 week period and retested. Results: During the DVJ, bracing increased knee extensor moments during the first 50 ms of landing but had no affect on knee frontal plane moments. Bracing increased vertical ground reaction force (vGRF) within the first 50ms of landing, and peak vGRF with less time to achieve peak vGRF. During the SLH, bracing increased knee flexion at IC and decreased knee frontal plane displacement into valgus. Ankle bracing increased vGRF within the first 50ms of landing and decreased stance time. Conclusions: Ankle bracing increased vGRF and knee extensor moments during the first 50ms of landing. Clinical Relevance: The adolscent female athlete may be at risk for knee injury during the initial landing phse when wearing a lace-up style ankle brace.
Download or read book The Effects of Repeated Bouts of Fatigue on Peak Ground Reaction Forces and Kinematics During Drop Landings in Recreational Athletes written by Danielle M. Lawson and published by . This book was released on 2015 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined repeated bouts of fatigue and its influence on biomechanical variables of drop landings known as risk factors for ACL injury. A repeated measures ANOVA was performed on fatigued conditions and gender as the independent variables. The dependent variables studied included: max ground reaction force, time to peak ground reaction force, sagittal hip, knee, and ankle angles, frontal knee angles, and knee joint moments. A 20-sec wingate anaerobic test was used as the repeated fatigue protocol and 5-drop landings were recorded in each fatigue condition. Results indicated that no significant differences across fatigue groups for max vertical ground reaction force, time to peak ground reaction force, knee joint moments (sagittal, frontal, transverse planes), hip flexion, knee flexion, ankle flexion, and knee abduction angles. Gender was noted as a significant factor regardless of fatigue condition on max vertical ground reaction force, ankle and knee flexion, and knee abduction angles.
Download or read book Ankle Bracing Alters Knee and Ankle Kinematics But Not Ground Reaction Forces During a Jump landing written by Lindsay J. Strickland and published by . This book was released on 2005 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Ankle Bracing on Ground Reaction Forces and Myoelectrical Activity of Selected Lower Extremity Muscles During Inversion Stress written by Mitchell L. Cordova and published by . This book was released on 1997 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of the Active Ankle Brace on Ground Reaction Forces written by Andrew D. Howell and published by . This book was released on 1995 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanobiology and Mechanophysiology of Military Related Injuries written by Amit Gefen and published by Springer. This book was released on 2016-03-31 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a state-of-the-art update, as well as perspectives on future directions of research and clinical applications in the implementation of biomechanical and biophysical experimental, theoretical and computational models which are relevant to military medicine. Such experimental and modeling efforts are helpful, on the one hand, in understanding the aetiology, pathophysiology and dynamics of injury development and on the other hand in guiding the development of better equipment and protective gear or devices that should ultimately reduce the prevalence and incidence of injuries or lessen their hazardous effects. The book is useful for military-oriented biomedical engineers and medical physicists, as well as for military physiologists and other medical specialists who are interested in the science and technology implemented in modern investigations of military related injuries.
Download or read book Comparison of Methods Simulating the Ankle Sprain Mechanism written by Qingjian Chen and published by . This book was released on 2009 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purposes of this study were to investigate the kinematics of two ankle brace testing protocols. They were drop landing on a slanted surface and the inversion drop test. Difference in kinematics and ground reaction forces of drop landing wearing an ankle brace on flat and lateral slant surfaces were also investigated. Eleven healthy subjects performed five trials in each of six dynamic movement conditions. They were an ankle inversion drop test on the inversion platform, drop landing from 0.45 m onto slant surface, and drop landing from 0.45 m onto flat surface with and without an ankle brace. A 7-camera motion analysis system was used to obtain the threedimensional kinematics. In addition, a force platform was used to measure the ground reaction forces (GRF) during drop landing. A 2 x 2 (brace x movement) repeated measures ANOVA was used to evaluate selected variables for inversion drop test and landing on slant surface (p
Download or read book Effects of Additional Load Application Orders on Landing Strategies written by Koichiro Kanatani and published by . This book was released on 1989 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of force attenuation and performance strategies to respond to changing mechanical constraints helps prevent injury as well as facilitates beneficial insight to provide appropriate instruction to athletes and students. The primary purpose of the study was to assess within subject variability of landing strategies when responding to additional load application orders. Four semi-skilled male volunteers served as subjects. The experimental arrangement consisted of a force platform and electromyography (EMG) interfaced with a computer, the Selspot Auto Tracking System, and a mechanical video system. Kinetic and kinematic data were obtained while subjects performed voluntary release drop landings for a total of 150 trials. On one day, subjects performed loaded-unloaded- loaded conditions for 25 trials each, while on the other other day, they performed unloaded-loaded-unloaded conditions for 25 trials each. Temporal and kinetic data describing the maximum impact force values and corresponding integrated EMG (IEMG) data were used in the analysis. The single subject design was used in the study. First (F1) and second (F2) maximum vertical ground reaction forces (GRF) and times of occurrence (T1, T2) were analyzed using ANOVA technique. Model statistics analysis was used for each variable to identify differing landing strategies employed by subjects. Simple regression analysis was used to assess the Newtonian response in predicting F1 and F2 by using load as the only independent variable. Multiple regression analyses were used to predict F1 and F2 from load and IEMG parameters in order to assess neuromuscular response component employed by the subjects to accommodate to changing mechanical constraints and application orders. ANOVA results identified statistically significant (p
Download or read book Effects of Ankle Bracing on Dynamic Stabilization in Subjects with Chronic Ankle Instability written by Brittany L. Taylor and published by . This book was released on 2008 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective: The purpose of this study was to compare a lace-up ankle brace with a no-brace condition on the ability to return an athlete with CAI to a stable state by measuring the TTS following a jump-landing task. Design: Repeated measures within-subject design. Setting: Athletic Training Research Laboratory. Patients or Participants: Ten subjects, five males and five females (18.5625±.814yr; 174.0963±7.191cm; 69.2937±8.277kg) that fit the criteria for chronic ankle instability participated in this study. Measurements: Subjects participated in two separate testing sessions during which a jump-landing task was performed with one of two conditions: lace-up ankle brace or no ankle brace. The brace condition was randomized. During each session, five trials of a jump-landing task were performed on each leg. The jump-landing task consisted of a single-leg landing from a double-leg jump height equivalent to 50% of the subject's maximum jump height. Subjects jumped off of both feet from a distance 70cm away from the center of the force plate, reached up and touched the indicated marker, and landed on the force plate on a single test limb. The landing leg was randomized. Ground reaction forces were used to calculate TTS in the medial/lateral (MLTTS) and anterior/posterior (APTTS) directions. The independent variables were Condition (brace, no brace) and Side (injured, non-injured). A separate two-within (Condition, Side) repeated measures ANOVA was performed for APTTS and MLTTS. Main Outcome Measure(s): APTTS and MLTTS. Results: For APTTS, the Side by Condition interaction was not statistically significant (F1,9 = .004; p=.952). For MLTTS, the Side by Condition interaction was not statistically significant (F1,9 = .023; p= .884). No measurements were found to be statistically significant in either direction. Conclusion: This study was designed to show if the use of an ankle brace, like the Swede-O Universal would assist those subjects with CAI in reducing the amount of time it takes for them to stabilize after a jump landing task. Although the results of this study do not support these conclusions with statistical significance, it may provide an important direction in examining the connection between TTS, ankle bracing, and those with CAI. There is a definite need for further testing on more subjects with CAI so we can make a better conclusion about the use of the Swede-O Universal and its ability to reduce time to stabilization after a jump-landing task.
Download or read book An Investigation of the Relationship Between Symmetry Index in Isometric Strength and Vertical Ground Reaction Forces in Drop landings written by Lemuel A. Brown and published by . This book was released on 2012 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Ankle Prophylactic Bracing on Kinematics of the Lower Body when Landing from a Vertical Jump written by Joshua Paul Rayburn and published by . This book was released on 2014 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study is to investigate the effects of the ASO ankle brace and the closed Gibney ankle taping method on kinematics of the lower body when landing from a vertical jump. By observing lower limb joint angular kinematics during landing this study may help to identify if ankle prophylactic bracing may increase the potential risk of injury to the more proximal unstabilized knee and hip joints. For this study, 10 females (age: 18-24 years), were randomly selected from a group (N= 24) of well-trained intercollegiate athletes, who had been competitive for at least 4 years in a jumping sport.
Download or read book Effect of Ankle Taping Or Bracing on Ground Reaction Force During Cutting Maneuvers written by Smadar Bezalel and published by . This book was released on 2009 with total page 76 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 (
Download or read book Ground Reaction Force Comparison Between Barefoot and Shod Single Leg Landing at Varied Heights written by Jocelyn Esther Arnett and published by . This book was released on 2020 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landing is a common movement that occurs in many sports. Barefoot research has gained popularity in examining how shoes can alter natural movements. However, it is unknown how a single leg landing under barefoot conditions, as well as landing height, will affect ground reaction forces (GRF). PURPOSE: The purpose of this research was to examine the differences in ground reaction forces during a single leg landing under barefoot and shod conditions from various heights. METHODS: Sixteen female Division II collegiate athletes, 8 basketball (age: 19.88 ± 0.64 yrs; height: 1.77 ± 0.09 m; mass: 75.76 ± 12.97 kg) and 8 volleyball (age: 20.00 ± 1.07 yrs; height: 1.74 ± 0.08 m; mass: 72.41 ± 5.41 kg), performed single leg landings from 12 inches, 18 inches, 24 inches, and 30 inches barefoot and shod. An AMTI AccuGait force plate was used to record GRF. A 2 (condition) x 4 (box height) x 2 (sport) repeated measures ANOVA was performed to determine any GRF differences. RESULTS: There were no significant three way or two-way interactions for GRF (p > 0.05). There was also no main effect for sport (p > 0.05). There were main effects for footwear and box height (p = 0.000) where shod (2295.121 ± 66.025 N) had greater impact than barefoot (2090.233 ± 62.684 N). CONCLUSIONS: Single leg shod landing produced greater vertical ground reaction forces (vGRF) than during a barefoot landing. Current research continues to be contradictory on whether or not barefoot activities lower GRF; therefore, it is important to continue research in this area.
