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Author : Evangelos Pappas
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.:/5 (836 download)
Download or read book The Effect of Gender and Fatigue on the Biomechanics of Landing from a Jump written by Evangelos Pappas and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pralhad S. Bide
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (692 download)
Download or read book Fatigue Related Gender Differences in the Biomechanics of Drop Jumps written by Pralhad S. Bide and published by . This book was released on 2008 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the present study was to determine the effects of gender and fatigue on knee kinematic and kinetic variables during the counter movement and drop jumps with specific interest on the progressive changes on knee kinematics and kinetics through out the fatigue protocol. Miami University students were recruited as study participants (n=52). Participants performed two baseline drop jumps and then were subjected to fatigue protocol for three different times. In between the fatigue protocols and at the end again they performed drop jumps. The kinetic and kinematic variables were recorded using force platform and the video cameras with SIMI motion analysis system respectively. Results indicated that with fatigue there were no changes in landing angles and in the force around the knee joint. They showed the decreased flexion at the knee joint with the progression of fatigue. Gender differences with the fatigue are also discussed.
Author : Caroline A. Wesley
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (457 download)
Download or read book The Effect of Fatigue on Landing Biomechanics of Males and Females written by Caroline A. Wesley and published by . This book was released on 2009 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephanie Eileen Field
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (981 download)
Download or read book The Influence of Age at Menarche and Hamstrings Fatigue on Knee Biomechanics written by Stephanie Eileen Field and published by . This book was released on 2016 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anterior cruciate ligament (ACL) injury is 4-8 times more likely to occur in females than in males and is associated with significant morbidity. The mechanism underlying the gender disparity in non-contact ACL injuries is likely multifactorial, and may be influenced by a variety of risk factors. This study examines the influence of age at menarche and neuromuscular fatigue of the hamstrings muscles on knee biomechanics. Twelve female athletes performed drop vertical jump (DVJ) tasks before and after a fatiguing protocol utilizing a glute-ham bench. Knee kinematics and kinetics were recorded during the contact phase of the DVJ. The results of this study found a significant decrease in knee abduction angle in the dominant leg after fatigue (P = 0.05), and a significant decrease in peak vertical ground reaction force (vGRF) after fatigue.The findings of this study do not support our hypotheses that (1) age at menarche is correlated with greater dynamic knee valgus, (2) that knee valgus is greater after fatigue, or (3) that the effects of fatigue are exacerbated in females with earlier age at menarche. We concluded that because the glute-ham raise targeted fatigue of the lateral hamstrings (biceps femoris), the exercise caused a decrease in potentially harmful valgus knee angles and moments. The reduction in peak vGRF after fatigue may be a result of an altered landing strategy in order to reduce impact forces and to maintain overall landing mechanics. Understanding the factors that affect knee biomechanics is critical for the development of more effective injury prevention strategies.
Author : Kristof Kipp
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (434 download)
Download or read book Acute and Delayed Effects of an Exhaustive Bout of Exercise on Landing Biomechanics in Women and Men written by Kristof Kipp and published by . This book was released on 2010 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although female athletes are at greater risk of non-contact knee injuries than men, the factors that contribute to these injuries are not well understood. One important question is whether intense exercise influences the risk of knee injury, both acutely and over the following days. The purpose of this study was thus to evaluate the acute and delayed effects of an intense bout of exercise on risk factors associated with knee injury in women and men. Fifteen each of healthy young women and men performed two testing sessions, 44-52 hours apart. In each session, biomechanical data were collected during execution of sets of 10 drop vertical jumps. An initial set of drop vertical jumps was compared to a set performed immediately after an intense exercise bout on the first day and to a set performed on the second day to determine the acute and delayed effects of fatigue, respectively. A two-way repeated measures ANOVA was used to determine the effect of the exercise bout on risk factors associated with knee injury during the jump task in women and men. Intense exercise had immediate effects on joint kinematics and kinetics, patterns of joint motion and moments, and the variability of joint couplings. The acute kinematic and kinetic changes at the hip and ankle were consistent with compensatory strategies, whereas changes at the knee were consistent with an increased risk of injury. The same appeared to be true for the patterns of joint motions and moments. Acute changes in the variability of inter- and intra-limb joint couplings were also consistent with compensatory modifications of lower limb biomechanics. Delayed effects were limited to patterns of joint motion and moments, and reflected jointdependent combinations of compensatory strategies or mechanical changes that could increase knee injury risk. Although intense exercise had acute and prolonged effects on several biomechanical variables, none of the effects depended on the sex of participants. These results indicate that intense exercise has immediate and prolonged effects on landing biomechanics, independent of sex. While the majority of changes point to a compensatory strategy, a few were consistent with increased risk of knee injury.
Author : Hannah L. Price
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (126 download)
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:
Author : Sophia Mancini
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)
Download or read book The Effects of a Soccer-specific Vertical Jump on Landing Mechanics written by Sophia Mancini and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Anterior cruciate ligament (ACL) injury frequently occurs in female soccer athletes during deceleration movements such as landings. In soccer, landings mostly occur following jumping headers. Little research has been done to determine the mechanics that follow and how they compare to standard drop vertical jumps (DVJ). The purpose of this study was to analyze differences between jumps and landings in kinematics, kinetics, and muscle activation patterns in female soccer athletes to better assess the sport-specific risk for ACL injury. It was hypothesized that more biomechanical tendencies associated with ACL risk factors would emerge from soccer-specific vertical jumps (SSVJ) compared to DVJs and second landings (L2) compared to first landings (L1). Methods: 8 female participants (20.88 ± 1.17 years; 1.68 ± 0.06 m; 58.77 ± 7.65 kg) performed DVJs and SSVJs. Motion capture, force, and electromyography (EMG) data were collected to calculate joint motion, loading, and muscle activation throughout landing phases. Data were analyzed using RM-ANOVA, collapsed across jump (DVJ vs. SSVJ) and landing (L1 vs. L2). Results: Significant findings were revealed in all categories, however, kinematic variables were the most profound results. Significantly higher jump height was achieved in DVJs (p=0.008). SSVJs and L2s produced less peak hip (p=0.03; d=0.817) (p=0.007; d=1.566) and knee 2 (p=0.002; d=0.732) (p=0.002; d=1.476) flexion during landing, respectively. A significant interaction was present for trunk flexion at initial contact (p=0.034). Follow-up tests revealed no significant differences following headers. Discussion: SSVJ-L2s displayed a more erect landing at the hip and knee, a known ACL risk factor, however, it is unclear whether these results are due to trunk movement during heading. Limited results in kinetic and EMG variables may be explained by the difference in jump height achieved, therefore further investigation in a more elite population is required. Additionally, SSVJs may be a good sport-specific screening tool.
Author : Ashley L. Hughes
Publisher :
ISBN 13 :
Total Pages : 77 pages
Book Rating : 4.:/5 (818 download)
Download or read book Using Three-dimensional Motion Analysis to Examine Jump Landing Biomechanics in Female Athletes to Identify Predispostion to ACL Injuries written by Ashley L. Hughes and published by . This book was released on 2009 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Melissa A. Mache
Publisher :
ISBN 13 :
Total Pages : 95 pages
Book Rating : 4.:/5 (69 download)
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.
Author : Danielle M. Lawson
Publisher :
ISBN 13 : 9781339062242
Total Pages : 202 pages
Book Rating : 4.0/5 (622 download)
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.
Author : Emily Nicole Johann
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (98 download)
Download or read book Influence of Drop Height and Fatigue on Landing Mechanics in Recreationally Active Females written by Emily Nicole Johann and published by . This book was released on 2014 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frank R. Noyes
Publisher : Springer
ISBN 13 : 3662565587
Total Pages : 658 pages
Book Rating : 4.6/5 (625 download)
Download or read book ACL Injuries in the Female Athlete written by Frank R. Noyes and published by Springer. This book was released on 2018-09-07 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This successful book, now in a revised and updated second edition, reviews all aspects of anterior cruciate ligament (ACL) injuries in female athletes, with the focus on complete, noncontact ACL injuries. The opening section discusses anatomy and biomechanics and explains the short- and long-term impacts of complete ACL ruptures, including long-term muscle dysfunction and joint arthritis. Risk factors and possible causes of the higher noncontact ACL injury rates in female athletes compared with male athletes are then discussed in depth. Detailed attention is devoted to neuromuscular training programs and their effectiveness in reducing noncontact ACL injury rates in female athletes, as well as to sports-specific ACL injury prevention and conditioning programs of proven value. Rehabilitation programs after ACL injury and reconstruction that reduce the risk of a future injury are explored, and the concluding section looks at worldwide implementation of neuromuscular ACL injury prevention training and future research directions. The book will be of value to orthopedic surgeons, physical therapists, athletic trainers, sports medicine primary care physicians, and strength and conditioning specialists.
Author : Soo-An Park
Publisher :
ISBN 13 : 9781109873771
Total Pages : 146 pages
Book Rating : 4.8/5 (737 download)
Download or read book Spinal Mechanics During Drop Landing: Effects of Gender, Fatigue and Landing Technique written by Soo-An Park and published by . This book was released on 2006 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objective. To investigate the kinematics of the spinal column and the kinetics of lumbosacral (L/S) and cervicothoracic (C/T) junctions during the drop landing, and to evaluate the effects of gender, landing technique, and fatigue.
Author : Jena Lynne Etnoyer
Publisher :
ISBN 13 :
Total Pages : 330 pages
Book Rating : 4.:/5 (436 download)
Download or read book The Effect of Instruction on Jump-landing Kinematics in Collegiate Age Female Athletes Over Time written by Jena Lynne Etnoyer and published by . This book was released on 2009 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Letha Y. Griffin
Publisher : Academy
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.3/5 (91 download)
Download or read book Prevention of Noncontact ACL Injuries written by Letha Y. Griffin and published by Academy. This book was released on 2001 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important work will help you understand: the epidemiology of noncontact ACL injuries; risk factors for injuries; the "at-risk" athlete; neuromuscular prevention programs; their influence on injury rates. Supported by the American Orthopaedic Society for Sports Medicine, the National Athletic Trainers Association Research and Education Foundation, the National Collegiate Athletic Association, and the Orthopaedic Research and Education Foundation.
Author : Lindsay Victoria Slater
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (694 download)
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.
Author : Ashley S. Long
Publisher :
ISBN 13 : 9781109846225
Total Pages : 127 pages
Book Rating : 4.8/5 (462 download)
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.
