Download or read book The Kinematic and Kinetic Effects of Fatigue on Vertical Jumping written by Scott Douglas Betty and published by . This book was released on 1994 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Anaerobic Fatique and Its Effect on Kinematic and Kinetic Varibles Associated with Impact During Vertical Jumping written by Russell E. Robinson and published by . This book was released on 1996 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Fatigue on the Kinematics and Muscle Activity Patterns During Continuous Vertical Jumping written by Maria Lyn A. Peralta and published by . This book was released on 1997 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Exercise Induced Muscular Fatigue on the Kinetics and Electromyographic Activity of a Single leg Vertical Jump in Healthy Men written by Thomas Kevin Robinson and published by . This book was released on 2004 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose/Hypotheses: The knee is the most commonly injured major joint, with approximately 80,000 anterior cruciate ligament (ACL) injuries annually. Epidemiological studies of sporting events show that knee injury frequency increases during during the latter portion of the game, thus injury may be associated with biomechanical changes induced by fatigue. We investigated the bilateral effects of unilateral lower extremity (LE) extensor muscle fatigue on electromyographic (EMG) patterns, kinematics, and kinetics of the single-leg vertical jump. Subjects: 15 healthy males, 22-29 years old. Methods: Subjects performed 5 maximal single-leg vertical jumps with each leg. Bilateral EMG (gluteus medius, vastus medialis and lateralis, medial and lateral hamstrings, gastroc/soleus), 3D lower extremity motion and ground reaction forces (GRF) from the jumping/landing leg were collected simultaneously. Subjects exercised the dominant LE (plant leg when kicking a ball) on a leg press machine to fatigue (unable to perform a complete leg press against resistance of 30% of body weight), then single-leg vertical jumps were repeated. Data were exracted in relation to landing events - initial force plate contact and the peak vertical GRF. EMG data were averaged across 5 trials and normalized as a percentage of the pre-exercise value for each muscle. Data analysis used repeated measures ANOVA and MANOVA. Results: There were significant interactions between limb dominance and fatigue for frontal plane knee valgus/varus moment (p=.035; larger on the dominant knee after exercise) and peak vertical GRF (p=.013; lower on the dominant leg after exercise). There was also a main effect of fatigue on peak anterior shear ground reaction force (p=.008; greater for the dominant leg after exercise). The dominant leg had significantly greater EMG activity of the gluteus medius and medial hamstring muscle groups. Conclusion: Despite reduced vertical and anterior GRF following exercise, landing from a single-leg vertical jump produced greater knee valgus moments and more EMG activity in the gluteus medius ad medial hamstring muscle groups in the dominant (exercised) leg and greater lateral hamstring and gastroc/soleus EMG activity in the non-dominant leg. Clinical Relevance: The change in post-fatigue forces in the dominant limb, particularly increased knee valgus moments, may increase the risk of ACL injury. The post-fatigue increase in gluteus medius and medial hamstring activity may be compensatory strategies to counteract the potentially damaging forces.

Download or read book The Influence of Fatigue on Saut Jump Kinematics and Kinetics in Dancers written by Erick Tuesta and published by . This book was released on 2019 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: In dance, injuries are extremely common and stem from the repeated jumping and leaping tasks found within performances. Fatigue is thought to be related to an increased risk of injury due to altered movement patterns, but little research has examined the effects of fatigue on dance performance. The purpose of this study is to determine the effects of a dance-specific fatigue protocol on performance of a sauté jump. It was hypothesized that (1) ankle dorsiflexion would decrease, (2) ankle plantarflexion would increase, (3) ankle eversion would decrease, (4) vertical ground reaction force (vGRF) would increase, (5) propulsive ground reaction (pGRF) force would increase, and (6) braking ground reaction force (bGRF) would decrease when dancers are in a fatigued state. Twenty healthy, experienced dancers (mean age 24.9±5.5 years, height 1.6± 0.05m, and mass 58.3±4.5 kg) with 19.6±5.7 years of dance training participated in this study after providing written informed consent. Dancers completed 10 sauté jumps before and after a dance-specific fatigue protocol designed to mimic a ballet class or rehearsal; the protocol was approximately one minute long and included a combination of jumps, leaps, and turns. Fatigue was defined as each dancer reaching a self-reported rating of greater than or equal to 17 on the Borg Rating of Perceived Exertion scale. A 12-camera motion capture system and two force plates were utilized to collect three-dimensional kinematic and kinetic data during the protocol. (1) Peak ankle dorsiflexion, (2) peak ankle plantarflexion, (3) peak ankle eversion, (4) peak vGRF, (5) peak pGRF, and (6) peak bGRF data were extracted for further analyses. Repeated measures MANOVAs were utilized with the Bonferroni alpha threshold of significance at less than 0.05. There were statistically significant differences from pre- to post-fatigue with (1) peak right dorsiflexion increased, (2) peak right plantarflexion decreased, (3) peak right eversion increased, and (4) peak vGRF decreased after fatigue. There was no change in (5) peak pGRF or (6) bGRF. The results revealed that aesthetics during a dance performance are affected by fatigue. The reduction of eccentric lower extremity muscular control may play a vital role for these dancers in terms of kinematic and kinetic changes after fatigue. With jump landing kinematics and kinetics affected after only an average of five minutes of dancing, these dancers may benefit from developing more eccentric strength to allow them to slow down properly while landing and to sustain the aesthetic demands throughout the performance. Having better control of one's body while landing from any jump can aid in preventing poor landing mechanics and potential injuries.

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.

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.

Download or read book The Effects of Two Different Fatigue Protocols on Lower Extremity Kinematics and Kinetics During an Unanticipated Running Stop jump written by David L. Quammen and published by . This book was released on 2010 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparison of Selected Kinematic and Kinetic Parameters of Two Vertical Jumping Techniques written by Patrice A. Milkovich and published by . This book was released on 1980 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Kinetic and Kinematic Analysis of the Drop Jump Following a Functional Fatigue Protocol written by Robert L. Sterner and published by . This book was released on 2001 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Fatigue on the Performance of a Vertical Jump in Dance written by Rhonda J. Steffen and published by . This book was released on 1986 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lower Extremity Neuromechanics During a Forward side Jump Following Functional Fatigue in Patients with Ankle Instability written by Hyunsoo Kim and published by . This book was released on 2015 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ankle instability (AI) and fatigue impair neuromuscular control as well as dynamic joint stability of the lower extremity. No one has comprehensively examined the effects of AI and fatigue on neuromechanics of the lower extremity during a functional activity. Deficits associated with AI and fatigue could be additive in increasing the risk for injury in patients with AI. PURPOSE: To examine the interaction of AI and fatigue on lower extremity muscle activity, kinematic, and kinetic patterns during a forward-side jump. METHODS: 25 AI (23.3 +-2.5 yrs, 176.5 +- 10.5 cm, 70.9 +- 11.4 kg), and 25 matched control subjects (23.7 +- 2.5 yrs, 175.0 +- 10.8 cm, 70.3 +- 12.8 kg) were categorized according to the Foot and Anlke Ability Measure (FAAM) (ADL: 84.3 +- 7.6%, Sport: 63.6 +- 8.6%) and the modified Anlke Instability Instrument (MAII) (3.7 +- 1.2). Fifty-nine reflective markers were place over anatomical landmarks and eight electromyography (EMG) electrodes were placed on tibialis anterior (TA), peroneus longus (PL), medical gastrocmedius (MG), medical hamstring (MH), vastus lateralis (VL), adductor longus (AL), gluteus medius (GMed), and gluteus maxiums (GMax) muscles in the involved leg. Subjects performed five forward-side jumps on a force plate before and after functional fatiguing exercises. To induce fatigue, subjects began 5-min incremental running on a treadmill between 5 and 6 mph. Next, subjects performed 20-second lateral counter movement jumps (CMJ), and 20 vertical CMJs. After each fatigue cycle, subjects performed one max vertical jump. Subjects repeated three exercises until Borg's rating of perceived exertion (RPE) reached 17 and the vertical jump height fell below 80% of their max jump height. Functional analysis of variance (FANOVA) (p

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.

Download or read book Functional Vs Isokinetic Fatigue Protocol written by Erik A. Wikstrom and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT (con't) : Two way repeated measures ANOVA revealed no significant differences when comparing isokinetic to functional fatigue values for vertical TTS [F(1,19)= 3.93, p=.538], medial/lateral TTS[F(1,19)= .287, p=.598], anterior/posterior TTS [F(1,19)= .001, p=.978], toe touch GRF [F(1, 19)=.121, p=.286], and heel strike GRF (F=3.673, p=.070). Also, no significant differences were revealed when comparing the fatigue protocols for ankle Dorsiflexion [F(1,19)= .06, p=.803], knee flexion [F(1,19)= .21, p=.652], and knee valgum [F(1,19)= .79, p=.386]. The results of this investigation suggest that the specific fatigue protocol used did not impair dynamic stability and that future research should focus on fatigue that occurs during athletic competition and the correctness of the measure of time to stabilization.

Download or read book Biomechanics of Cycling written by Rodrigo R. Bini and published by Springer Science & Business. This book was released on 2014-04-30 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bicycles have been a common device to enhance physical fitness level in gyms and training centers along with solid use in competitive sport. For that reason, biomechanics of cycling has grown as a research field with many publications addressing different perspective of the interaction between the cyclist and his bicycle. The most common end point of research on biomechanics of cycling is optimization of performance and reduction of injury risk. One goal of this book is to meet the growing need for a comprehensive presentation of contemporary knowledge on biomechanics of cycling which will positively influence the activity of cycling in a global fashion. In order to accomplish this purpose, ten chapters are presented with focus on varying methods for biomechanical analysis of cycling motion. The introduction section provides an overview of the main methods for assessment of cycling motion, including motion analysis, pedal force measurements, muscle activation, anthropometry and joint kinetics. These methods are discussed in depth in individual chapters followed by chapters on characteristics of bicycles and potential perspectives to improve their configuration in order to improve performance of cyclists and reduce their overuse injury risk. Moreover, a preliminary method to train technique in cyclists is shown. A final chapter provides authors perspective on the upcoming technology that should be effective in helping training of cyclists.

Download or read book Kinematic and Kinetic Relationships Between an Olympic Style Lift and the Vertical Jump written by Paul K. Canavan and published by . This book was released on 1993 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.