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 Fatigue on Lower Extremity Landing Mechanics in Dancers written by Rachel Abergel and published by . This book was released on 2019 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction: Dancers use mechanical manipulation of the body to convey a detailed story in an aesthetic manner. In doing so, both acute and chronic fatigue as a result of countless rehearsals and performances are to be expected. During landing in particular, joints of the lower extremity are constantly loaded which may result in adverse kinetic and kinematic outcomes. There is limited dance research looking at lower extremity kinematics in conjunction with fatigue, and even more limited research offering insight into dance-specific fatigue protocols. The purpose of this study was to compare sauté landings before and after fatigue in experienced female dancers. Methods: Twenty experienced dancers (mean age 24.9 ± 5.5 years; height 1.6 ± 0.1 m; weight 58.3 ± 4.5 kg; 20.1 ± 5.7 years dance training) participated after providing informed consent. A ballet-based movement protocol was created to generate a self-reported fatigue response in dancers. The Borg Scale for Rating of Perceived Exertion (RPE) was used to classify fatigue as a rating of ≥17. A 12-camera motion capture system was used to collect three-dimensional kinematic data as dancers performed 20 sauté jumps before and after fatigue. Data were extracted to compare peak hip and knee kinematics before and after fatigue using a MANOVA (p≤0.05). Intersegmental coupling of the knee and hip were measured by amount of time spent in each phase (Anti-Phase, In-Phase, Knee Phase, Hip Phase) in the sagittal, frontal, and transverse planes following fatigue conditions in jump landings. Coupling angles included time spent in each phase during a jump cycle. Results: After fatigue, dancers demonstrated increased hip flexion (36.01±8.34° pre, 40.76±10.26° post; p=0.004) and knee flexion (62.74±3.78° pre, 65.31±4.66° post; p=0.002) during sauté landings. Dancers also demonstrated decreased peak hip external rotation (-15.64±6.66° pre, -13.41±6.17° post; p=0.008) and increased knee abduction (5.86±2.44° pre, 6.64±2.98° post; p=0.015) when fatigued. Coordination coupling showed statistically significant increases in time spent In-Phase in the hip and knee bilaterally in the sagittal plane following fatigue (41.95 ± 14.08 pre, 50.4 ± 14.28 post, p = 0.003 left leg; 42.05 ± 13.35 pre, 49.45 ± 14.05 post, p = 0.007 right leg). There was also significantly less time spent in Knee Phase in the hip and knee coupling, bilaterally following conditions of fatigue (41.7 ± 15.96 pre, 33.65 ± 14.21 post, p = 0.001 left leg; 41.65 ± 13.36 pre, 34.25 ± 14.22 post, p = 0.004 right leg). Conclusion: As fatigue ensues, both hip and knee mechanics are significantly altered. In the sagittal plane, both the hip and knee demonstrate increased flexion during landing in the fatigued state. Additionally, the knee goes into a greater amount of abduction after fatigue and decreased external rotation at the hip accompanies further flexion. These altered landing mechanics put the body into a less desirable anatomical and aesthetic position. A possible link can be made to the change in these variables and how they may lead to injurious outcomes. Keywords: fatigue; dance; rating of perceived exertion; kinematics; lower extremity; injury

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 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 Influence of the High Intensity Dance Performance Fitness Test on Lower Extremity Biomechanics written by Erica Burke and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 The Effect of Dance Shoes on Jumping Performance in Dancers written by Christopher Urey and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dancers experience a high rate of injuries, with the foot and ankle reported as the most common injury location. Footwear has the potential to modify the interaction between the foot and the floor which could affect injury risk. While some efforts have been made to design footwear that would be beneficial for dancers in terms of performance and injury prevention, most footwear commonly used by dancers offers very little support to the foot and ankle region. Dancers often prefer a barefoot-like feel, so a small shoe such as the Bloch Spin II may be used to enhance turning ability while maintaining some contact of the bare foot with the floor. These shoes have a canvas toe portion with minimal padding that covers the forefoot, leaving the midfoot and heel bare. Currently, no research has examined the effect of these shoes on dance performance. The purpose of this study is to compare the right leg kinematics and kinetics between dancing barefoot and wearing Bloch Spin II dance shoes. Ten dancers provided informed consent to participate in this study. A twelve-camera video motion capture system and two force plates were used to collect kinematic and kinetic data while dancers performed ten consecutive sauté jumps barefoot and in Bloch Spin II shoes, in a randomized order. Sautés are performed with their arms in 5th position and legs in 2nd position. Arms would create an oval shape above the head and the feet would create a 45-degree angle pointed laterally. Feet are also outside hip width apart. Visual 3D software was used to calculate peak hip, knee, ankle, and toe kinematics and kinetics. MATLAB was used to organize data and gather variables to find statistical significances in SPSS. Comparisons between footwear conditions were made using repeated measures MANOVAs, with a p-value of 0.05 or lower used to signify statistical significance. While wearing Bloch shoes, dancers demonstrated lower peak ankle dorsiflexion angle (28.62 ± 3.21° barefoot, 26.93 ± 3.98° Bloch, p=0.007), lower peak MTP flexion angle (-17.76 ± 11.04° barefoot, -12.16 ± 6.79° Bloch, p =0.024) and lower peak MTP extension angle (28.17 ± 6.11° barefoot, 22.62 ± 7.41° Bloch, p

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 Kinetic and Kinematic Parameters of Landing Impact Forces in the Dance Jump and Leap written by Theodore Jay Becker and published by . This book was released on 1984 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Resistance Mode on Squat and Jump Kinematics and Kinetics written by D. Travis McMaster and published by . This book was released on 2009 with total page 110 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 Effect of Acute Fatigue on Reactive Strength Index in Modern Dancers written by Jordan Tingman and published by . This book was released on 2020 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Purpose: The purpose of this study was to evaluate the effects of acute fatigue on stretch shortening cycle (SSC) performance measured by the Reactive Strength Index (RSI) derived from a drop jump. Methods: Twelve professional modern dancers (8 female, 4 male) participated in this study. Two force plates were utilized to record the force-time data during drop jumps (DJ) before and after an acute, fatiguing protocol. Dancers performed a 5-10 minute self-selected warm up followed by 3-5 practice trials of DJs onto the force plates. Three trials were recorded from each dancer with 30-60 seconds (s) of rest between trials. Following the first 3 trials dancers underwent 2 minutes of continuous rope jumping. After 30s of rest following rope jumping dancers performed 3 more trials of drop jumps. Cronbach's alpha was used to assess reliability across trials, and a paired t-test was used to determine differences in RSI before and after the rope jumping protocol. Results: There was no significant difference between best nonfatigued reactive strength index (NFRSI) and best fatigued reactive strength index (FRSI) when compared (p = 0.136). Conclusions: Elite modern dancers are able to maintain jump performance following acute fatigue. Future research should investigate the effect of specific training for lower body power in modern dancers. Research to guide understanding the importance of supplemental training in modern dance performance could be key in preparing future dancers for the demands of elite dance requirements"--Page iii.

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 The Effects of Dance Socks on Jumping Performance in Dancers written by Briggitte Paschall and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Injuries in dancers are very common, and the foot and ankle are the most frequently injured body region. While some efforts have been made to design footwear that would be beneficial to dancers in terms of performance or injury prevention, there is minimal research examining the effects of footwear on dance performance. A recent trend in dance is the use of socks rather than shoes as footwear for both class and performance. Socks tend to be affordable and comfortable, and while they do not provide much in terms of shock-absorption or protection, they do reduce friction between the foot and the floor. Companies have begun to develop and market socks specifically for dancers, making claims that the use of socks reduces forces, provides foot and ankle support, and may help prevent dance injuries, but no empirical evidence has been provided to support these statements. The purpose of this study is to compare the lower extremity kinetics and kinematics of dancers performing jumps while barefoot, while wearing traditional everyday sport socks, and while wearing Apolla dance socks. Ten healthy dancers between the ages of 18 and 45 were recruited for this IRB-approved study. After providing informed consent, three-dimensional motion analysis was performed using a computer-aided video motion analysis system (Motion Analysis) with reflective markers placed on the torso and lower extremities. After a warm-up, participants performed several types of common dance jumps, including sautés (vertical bipedal jumps). The movements were performed barefoot, then repeated with the participant wearing generic athletic socks and the Apolla dance socks, with the order of these conditions randomized for each participant. The digital camera signals were processed and analyzed using Cortex software. Visual3D software (C-Motion, Inc.) was used to quantify hip, knee, ankle, and toe kinematics and kinetics. Results between the barefoot and sock conditions were compared using repeated measures ANOVAs (p ≤ 0.05). Dancers demonstrated no significant differences in peak hip flexion (40.24±7.04° barefoot, 42.00±5.74° Apolla, 39.81±6.99° socks, p=0.702), hip extension (6.84±7.55° barefoot, 8.61±10.55° Apolla, 6.35±8.32° socks, p=0.678), knee flexion (64.72±7.83° barefoot, 65.57±7.93° Apolla, 66.05±6.27° socks, p=0.428), knee extension (-2.31±6.23° barefoot, -1.08±4.33° Apolla, -0.47±4.49° socks, p=0.112), ankle dorsiflexion (28.63±3.22° barefoot, 25.40±5.07° Apolla, 27.83±3.52° socks, p=0.057), ankle plantarflexion (-65.74±6.94° barefoot, -66.70±4.66° Apolla, -67.07±5.14° socks, p=0.692), or metatarsal phalangeal (MTP) extension (28.17±6.11° barefoot, 28.90±6.11° Apolla, 27.89±6.05° socks, p=0.766) between conditions. There were also no significant differences in the peak moments of the hip (-0.84± 0.39 Nm/kg barefoot, -0.86±0.63 Nm/kg Apolla, -0.76±0.26 Nm/kg socks p=0.526), knee (-2.38± 00.38 Nm/kg barefoot, -2.35±0.40 Nm/kg Apolla, -2.42±0.47Nm/kg socks, p=0.648), ankle (-1.94±0.7- Nm/kg barefoot, Apolla, socks p=0.332), or MTP (-0.27± 0.19Nm/kg barefoot, -0.23±0.19 Nm/kg Apolla, -0.17±0.067Nm/kg socks p=0.078) joints. Lastly, there were no significant differences in the vertical ground reaction forces (2.01±0.28xBW barefoot, 1.95±0.32 xBW Apolla, 2.00±0.24xBW socks, p=0.601). However, there was a significant difference in peak MTP flexion (-17.76±11.05° barefoot, -13.53±6.68° Apolla, -20.82±9.75 socks, p=0.023) during the sauté jumps, with the Apolla socks having the lowest peak MTP flexion While there were no statistically significant differences in ankle dorsiflexion, knee extension, or the MTP joint moments, it is important to note that the p-values were very low and close to being less than or equal to 0.05. Peak ankle dorsiflexion was lower while dancers were wearing the Apolla socks, which may be an effect of the compression in this area of the socks. However, knee extension and MTP moment were lower while participants were wearing the generic athletic socks. This may be due to the lack of friction with the socks and performing on the lab's slick floors. While a spray adhesive was provided for the participants to apply to their socks, there have still been some hesitation when performing the jumps. Based on the results of the current study, the Apolla socks reduced motion at the MTP joints. This may show that the Apolla socks provide some protection of the MTP joints during the performance of a dance jump.

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: