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Journal articles on the topic 'Vertical jumps'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Gherghel, Anamaria, Dana Badau, Adela Badau, et al. "Optimizing the Explosive Force of the Elite Level Football-Tennis Players through Plyometric and Specific Exercises." International Journal of Environmental Research and Public Health 18, no. 15 (2021): 8228. http://dx.doi.org/10.3390/ijerph18158228.

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The aim of the research was to implement an athletic program to improve the explosive force in order to optimize physical fitness at the level of elite football-tennis players and evaluate the progress made through specific tests using the Opto Jump. The research included 10 elite European and world-class players, on whom an experimental program was applied in order to improve the explosive force of the limbs in conditions of speed, endurance, and dynamic balance. Study tests: five vertical jumps on the spot, on the left/right leg; five back and forth jumps on the left/right leg; five left/rig

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Pereira, Gleber, Paulo B. de Freitas, Jose A. Barela, et al. "Vertical jump fatigue does not affect intersegmental coordination and segmental contribution." Motriz: Revista de Educação Física 20, no. 3 (2014): 303–9. http://dx.doi.org/10.1590/s1980-65742014000300009.

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The aim of this study was to describe the intersegmental coordination and segmental contribution during intermittent vertical jumps performed until fatigue. Seven male visited the laboratory on two occasions: 1) the maximum vertical jump height was determined followed by vertical jumps habituation; 2) participants performed intermittent countermovement jumps until fatigue. Kinematic and kinetic variables were recorded. The overall reduction in vertical jump height was 5,5%, while the movement duration increased 10% during the test. The thigh segment angle at movement reversal significantly inc

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Gerber, C., P. Sirieiro, I. Nasser, C. Taber, and H. Miranda. "Postactivation potentiation improves jumps performance in children ages 6 to 8 years old." Archivos de Medicina del Deporte 38, no. 3 (2021): 192–96. http://dx.doi.org/10.18176/archmeddeporte.00043.

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Introduction: The aim of the present study was to investigate the effects of postactivation potentiation (PAP) in vertical and horizontal jump performance in pre-pubertal children. Material and method: One hundred and nineteen children (65 girls and 54 boys; 6.8 ± 0.7 years old; 124.5 ± 6.4 cm; 25.2 ± 5.1 kg) participated in this study. This was a transversal cross-sectional study which incorporated a within-subjects repeatedmeasures design, where participants completed all protocols. The experimental procedure required four total testing, separated by one week, using a counterbalanced. This s

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Hyun, Seung Hyun, and Hyeonseong Jin. "Effect of Knee Compression on Kinetic Variables During Vertical Jumps." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 72, no. 6 (2018): 327–33. http://dx.doi.org/10.2478/prolas-2018-0045.

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Abstract The purpose of this study was to determine how knee compression affected kinetic variables during vertical jumps. Ten healthy males, age 20s, performed a single maximum vertical jump and a ten-consecutive vertical jump trial without knee compression (control condition) and with knee compression. The collected data of ground reaction force were used to analyse the vertical jump height (VJH), peak active force (PAF), decay rate (DR), peak passive force (PPF), loading rate (LR), and the coefficient of variation (CV). During a maximum vertical jump, knee compression increased the magnitud

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Shu, Yang, Dong Sun, Qiu Li Hu, Yan Zhang, Jian She Li, and Yao Dong Gu. "Lower Limb Kinetics and Kinematics during Two Different Jumping Methods." Journal of Biomimetics, Biomaterials and Biomedical Engineering 22 (March 2015): 29–35. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.22.29.

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The purpose of the study is to investigate into the dynamic and kinematic parameters of lower limbs about two types of jump high-level basketball athlete doing: countermovement jump and squat jump. There were distinctively different in jump height between two types. Kinetics and kinematics parameters of squat jump were less than countermovement jump. Using Vertical Jumps countermovement jump can increase the height of vertical jump effectively. These jumps all can cushion the pressure of impact force in landing phase.

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Smith, Bradley, Tina Claiborne, and Victor Liberi. "Ankle Bracing Decreases Vertical Jump Height and Alters Lower Extremity Kinematics." International Journal of Athletic Therapy and Training 21, no. 2 (2016): 39–46. http://dx.doi.org/10.1123/ijatt.2014-0143.

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The purpose of this study was to determine the effects of ankle bracing on vertical jump performance and lower extremity kinematics and electromyography (EMG) activity. Twenty healthy college athletes participated in two sessions, separated by a minimum of 24 hr. They performed five jumps with no brace on the first day, and five jumps with both ankles braced on the second day. An average of the three highest jumps each day was used for analysis. Braced vertical jump performance significantly decreased (p = .002) as compared with the unbraced condition. In addition, hip flexion (p = .043) and a

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Rodríguez-Lorenzo, Lois, Miguel Fernandez-del-Olmo, José Andrés Sanchez-Molina, and Rafael Martín-Acero. "Role of Vertical Jumps and Anthropometric Variables in Maximal Kicking Ball Velocities in Elite Soccer Players." Journal of Human Kinetics 53, no. 1 (2016): 143–54. http://dx.doi.org/10.1515/hukin-2016-0018.

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AbstractKicking is one of the most important skills in soccer and the ability to achieve ma ximal kicking velocity with both legs leads to an advantage for the soccer player. This study examined the relationship be tween kicking ball velocity with both legs using anthropometric measurements and vertical jumps (a squat jump (SJ); a countermovement jump without (CMJ) and with the arm swing (CMJA) and a reactive jump (RJ)). Anthropome tric measurements did not correlate with kicking ball velocity. Vertical jumps correlated significantly with kicking ball velocity using the dominant leg only (r =

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Bobbert, Maarten F., Wendy W. de Graaf, Jan N. Jonk, and L. J. Richard Casius. "Explanation of the bilateral deficit in human vertical squat jumping." Journal of Applied Physiology 100, no. 2 (2006): 493–99. http://dx.doi.org/10.1152/japplphysiol.00637.2005.

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In the literature, it has been reported that the mechanical output per leg is less in two-leg jumps than in one-leg jumps. This so-called bilateral deficit has been attributed to a reduced neural drive to muscles in two-leg jumps. The purpose of the present study was to investigate the possible contribution of nonneural factors to the bilateral deficit in jumping. We collected kinematics, ground reaction forces, and electromyograms of eight human subjects performing two-leg and one-leg (right leg) squat jumps and calculated mechanical output per leg. We also used a model of the human musculosk

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Atli, Ahmet, and Ali Furkan Yarar. "Kinematic Analysis of Vertical Jump Performances Before and After Fatigue in Basketball Players." Pakistan Journal of Medical and Health Sciences 15, no. 7 (2021): 2226–28. http://dx.doi.org/10.53350/pjmhs211572226.

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Background and Study Aim: This single group pre- and post-test study aimed to examine kinematic changes in vertical jump performances before and after fatigue in basketball players. Material and Method: Ten male university student (age 23.28±1.31 years, height 181.17±6.87 cm, body weight 74.53±9.27 kg) basketball players voluntarily participated in the study. Vertical jump test was performed twice, once before fatigue and again after fatigue, and jump measurements were recorded with 2 cameras capable of shooting 240 frames per second. The vertical jumps were measured using a Smart Speed device

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Król, Henryk, and Władysław Mynarski. "A comparison of mechanical parameters between the counter movement jump and drop jump in Biathletes." Journal of Human Kinetics 34, no. 1 (2012): 59–68. http://dx.doi.org/10.2478/v10078-012-0064-y.

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AbstractThe main objective of the study was to determine to what degree higher muscular activity, achieved by increasedload in the extension phase (eccentric muscle action) of the vertical jump, affects the efficiency of the vertical jump.Sixteen elite biathletes participated in this investigation. The biathletes performed tests that consisted of five, single“maximal” vertical jumps (counter movement jump - CMJ) and five, single vertical jumps, in which the task was totouch a bar placed over the jumping biathletes (specific task counter movement jump - SCMJ). Then, they performedfive, single d

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Requena, Bernardo, Inmaculada Garcia, Francisco Requena, Eadric Bressel, Eduardo Saez-Saez de Villarreal, and John Cronin. "Association between traditional standing vertical jumps and a soccer-specific vertical jump." European Journal of Sport Science 14, sup1 (2012): S398—S405. http://dx.doi.org/10.1080/17461391.2012.708790.

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King, Deborah L. "Performing Triple and Quadruple Figure Skating Jumps: Implications for Training." Canadian Journal of Applied Physiology 30, no. 6 (2005): 743–53. http://dx.doi.org/10.1139/h05-153.

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The purpose of this paper is to review the biomechanics of triple and quadruple figure skating jumps, focusing on information that has implications for strength and conditioning programs. At a minimum, to complete the required revolutions in a jump, a skater must balance the average angular velocity with the time in the air. Vertical velocity at takeoff is similar in high revolution jumps to that in low revolution jumps; however, when comparing skaters of different abilities, those with higher abilities generate greater vertical velocities at takeoff for the same type of jump. Powerful extensi

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Vint, Peter F., and Richard N. Hinrichs. "Differences between One-Foot and Two-Foot Vertical Jump Performances." Journal of Applied Biomechanics 12, no. 3 (1996): 338–58. http://dx.doi.org/10.1123/jab.12.3.338.

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The purpose of this investigation was to quantify the differences between one- and two-foot vertical jumping performances. Fourteen subjects performed both jump styles with a four-step, self-paced approach. While overall jump and reach heights were similar between one-foot and two-foot jumps, the strategies employed to achieve these results were notably different. One-foot jumps benefited from an increased takeoff height that was largely attributable to the elevation of the free swinging leg. Further, it was suggested that the actions of this limb may have helped slow the rate of extension of

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Sánchez-Sixto, Alberto, Andrew Harrison, and Pablo Floría. "Larger Countermovement Increases the Jump Height of Countermovement Jump." Sports 6, no. 4 (2018): 131. http://dx.doi.org/10.3390/sports6040131.

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Simulation studies show that jump performance can be improved by increasing the depth of countermovement. The purpose of this study was to determine how modifications to the depth of countermovement lead to changes in jump height and the biomechanical parameters related to center of mass displacement and force application. Twenty-nine competitive males participated in this investigation, performing nine countermovement jumps using a self-selected, a deep, and a shallow crouch position. Jump height and relative net vertical impulse were greater when using a deeper crouch position, compared to t

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Castillo, Daniel, Javier Yanci, and Jesús Cámara. "Impact of Official Matches on Soccer Referees’ Power Performance." Journal of Human Kinetics 61, no. 1 (2018): 131–40. http://dx.doi.org/10.1515/hukin-2017-0116.

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Abstract The evaluation of match officials’ neuromuscular performance is now an important consideration and the vertical jump test is considered suitable for assessing lower limb power, partly because it is directly related to refereeing. The aim of this study, therefore, was to determine the effect of soccer matches on match officials’ vertical jump performance by assessing various biomechanical variables. Eighteen field referees (FRs) and 36 assistant referees (ARs) who officiated in 18 official matches participated in this study. Before the match, at half time and immediately after the matc

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Arsenijevic, Radenko, Igor Ilic, and Veroljub Stankovic. "The Rating of Perceived Exertion Predicts Performance Loss and Physiological Demand in Vertical Jump Session Until Voluntary Failure." GYMNASIUM XXI, no. 2 (Supplement) (2020): 73. http://dx.doi.org/10.29081/gsjesh.2020.21.2s.05.

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The aims of this study were (a) to assess the ability of the rating of perceived exertion (RPE) to predict performance loss (i.e. percent of drop in height relative to maximal height) of vertical jump session until voluntary failure, and (b) to determine the ability of RPE to describe the physiological demand of this session via heart rate monitor. Ten healthy men performed vertical jumps (counter-movement jump) until voluntary failure. Before session start maximal jump height for every subject was determined. Heart rate and RPE, separately for legs (RPE legs) and for breath (RPE breath), were

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Kirby, Tyler J., Jeffrey M. McBride, Tracie L. Haines, and Andrea M. Dayne. "Relative Net Vertical Impulse Determines Jumping Performance." Journal of Applied Biomechanics 27, no. 3 (2011): 207–14. http://dx.doi.org/10.1123/jab.27.3.207.

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The purpose of this investigation was to determine the relationship between relative net vertical impulse and jump height in a countermovement jump and static jump performed to varying squat depths. Ten college-aged males with 2 years of jumping experience participated in this investigation (age: 23.3 ± 1.5 years; height: 176.7 ± 4.5 cm; body mass: 84.4 ± 10.1 kg). Subjects performed a series of static jumps and countermovement jumps in a randomized fashion to a depth of 0.15, 0.30, 0.45, 0.60, and 0.75 m and a self-selected depth (static jump depth = 0.38 ± 0.08 m, countermovement jump depth

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Birat, Anthony, David Sebillaud, Pierre Bourdier, et al. "Effect of Drop Height on Vertical Jumping Performance in Pre-, Circa-, and Post-Pubertal Boys and Girls." Pediatric Exercise Science 32, no. 1 (2020): 23–29. http://dx.doi.org/10.1123/pes.2019-0120.

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Purpose: To examine the effect of drop height on vertical jumping performance in children with respect to sex and maturity status. Methods: Thirty-seven pre-pubertal, 71 circa-pubertal, and 69 post-pubertal boys and girls performed, in a randomized order, 2 squat jumps, 2 countermovement jumps, and 2 drop jumps (DJ) from heights of 20, 30, 40, 50, 60, and 70 cm. The trial with the best jump height in each test was used for analysis. Results: No significant sex × maturity status × jump type interaction for jump height was observed. However, on average, the children jumped higher in the counterm

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Chiu, Loren Z. F., and George J. Salem. "Pelvic Kinematic Method for Determining Vertical Jump Height." Journal of Applied Biomechanics 26, no. 4 (2010): 508–11. http://dx.doi.org/10.1123/jab.26.4.508.

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Sacral marker and pelvis reconstruction methods have been proposed to approximate total body center of mass during relatively low intensity gait and hopping tasks, but not during a maximum effort vertical jumping task. In this study, center of mass displacement was calculated using the pelvic kinematic method and compared with center of mass displacement using the ground-reaction force-impulse method, in experienced athletes (n= 13) performing restricted countermovement vertical jumps. Maximal vertical jumps were performed in a biomechanics laboratory, with data collected using an 8-camera mot

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Sánchez-Sixto, Alberto, Andrew J. Harrison, and Pablo Floría. "Effects of Plyometric vs. Combined Plyometric Training on Vertical Jump Biomechanics in Female Basketball Players." Journal of Human Kinetics 77, no. 1 (2021): 25–35. http://dx.doi.org/10.2478/hukin-2021-0009.

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Abstract The purpose of this study was to assess and compare the effects of plyometric training and combined training programs on vertical jump kinematics and kinetics of female basketball players. Thirty-six female basketball players were included in the study and further divided into three groups: plyometric training, n = 11; combined training n =13; and a control group, n =12. Combined training comprised full squat exercise with low resistance (50-65% 1RM) and low volume (3-6 repetitions/set) combined with repeated jumps. Plyometric training included drop jumps and repeated jumps. Both trai

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Reina, Raúl, José Elvira, Manuel Valverde, Alba Roldán, and Javier Yanci. "Kinematic and Kinetic Analyses of the Vertical Jump with and without Header as Performed by Para-Footballers with Cerebral Palsy." Sports 7, no. 9 (2019): 209. http://dx.doi.org/10.3390/sports7090209.

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Vertical jump is a relevant variable in the classification of football for individuals with cerebral palsy. In this regard, the literature is limited. There are no studies assessing vertical jumping ability through kinematic methods and in more specific football game situations, such as jumps with a header. The goals of the present study were to assess how the modification of jumping conditions (without and with a header) might affect the kinematic and kinetic parameters of counter movement jumping, and whether the functional profiles of the players constrain their ability to jump vertically,

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Aragón-Vargas, Luis F., and M. Melissa Gross. "Kinesiological Factors in Vertical Jump Performance: Differences among Individuals." Journal of Applied Biomechanics 13, no. 1 (1997): 24–44. http://dx.doi.org/10.1123/jab.13.1.24.

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The purpose of this study was to investigate the kinesiological factors that distinguish good jumpers from poor ones, in an attempt to understand the critical factors in vertical jump performance(VJP).Fifty-two normal, physically active male college students each performed five maximal vertical jumps with arms akimbo. Ground reaction forces and video data were collected during the jumps. Subjects' strength was tested isometrically. Thirty-five potential predictor variables were calculated for statistical modeling by multiple-regression analysis. At the whole-body level of analysis, the best mo

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Sánchez-Sixto, Alberto, Julio López-Álvarez, and Pablo Floría. "Efecto de modificar la profundidad y velocidad del contramovimiento durante el salto vertical (Effects of countermovement depth and velocity modifications during the vertical jump)." Retos, no. 34 (May 31, 2018): 287–90. http://dx.doi.org/10.47197/retos.v0i34.64854.

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Objetivo. El objetivo de la presente investigación fue evaluar el efecto de modificar la profundidad y la velocidad del contramovimiento en el salto vertical. Material y método. Once jugadores de deportes colectivos participaron en este estudio y realizaron 9 saltos con contramovimiento: 3 en los que ellos seleccionaban la velocidad y profundidad del contramovimiento (CMJ), 3 en los que incrementaban la profundidad del contramovimiento y seleccionaban libremente su velocidad (CMJP) y 3 en los que incrementaban la profundidad y velocidad del contramovimiento (CMJPR). La altura máxima, el tiempo

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Watkins, Casey M., Ed Maunder, Roland van den Tillaar, and Dustin J. Oranchuk. "Concurrent Validity and Reliability of Three Ultra-Portable Vertical Jump Assessment Technologies." Sensors 20, no. 24 (2020): 7240. http://dx.doi.org/10.3390/s20247240.

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Vertical jump is a valuable training, testing, and readiness monitoring tool used across a multitude of sport settings. However, accurate field analysis has not always been readily available or affordable. For this study, two-dimensional motion capture (Mo-Cap), G-Flight micro-sensor, and PUSH accelerometer technologies were compared to a research-grade force-plate. Twelve healthy university students (7 males, 5 females) volunteered for this study. Each participant performed squat jumps, countermovement jumps, and drop jumps on three separate occasions. Between-device differences were determin

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Nygaard Falch, Hallvard, Håvard Guldteig Rædergård, and Roland Van den Tillaar. "Relationship of Performance Measures and Muscle Activity between a 180° Change of Direction Task and Different Countermovement Jumps." Sports 8, no. 4 (2020): 47. http://dx.doi.org/10.3390/sports8040047.

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The ability to rapidly perform change of direction (COD) is crucial for performance in Soccer. COD speed is thought to share similarities with countermovement jumps in kinematics and muscle activation. Thus, the objective of the current study was to investigate the relationship between muscle activities in performance measures of a modified 505-agility test and different countermovement jumps. Twenty-one experienced soccer players performed a COD test including the 505-agility test and uni- and bi-lateral horizontal and vertical countermovement jumps. The main findings were that the vertical b

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Hurr, Chansol. "Acute Local Cooling to the Lower Body during Recovery Does Not Improve Repeated Vertical Jump Performance." International Journal of Environmental Research and Public Health 18, no. 9 (2021): 5026. http://dx.doi.org/10.3390/ijerph18095026.

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BACKGROUND: Local cooling, or cryotherapy, has received attention due to its effects on athlete recovery before or after strenuous exercise. This study seeks to verify the effectiveness of 3 min applications of acute local cooling to the lower extremities between sets of a repeated vertical jump exercise. METHODS: Using a randomized crossover design, twelve subjects performed a total of 3 sets of 30 consecutive maximal vertical jumps and were allowed a recovery period of 5 min after each set. In the recovery period, subjects rested with or without a cooling suit worn on their lower legs. Chang

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Driller, Matthew, Francisco Tavares, Daniel McMaster, and Shannon O’Donnell. "Assessing a smartphone application to measure counter-movement jumps in recreational athletes." International Journal of Sports Science & Coaching 12, no. 5 (2017): 661–64. http://dx.doi.org/10.1177/1747954117727846.

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The use of counter-movement jumps as a measure of neuromuscular performance in athletes has become common in the sport setting. Accurate methods of measuring jump parameters are often expensive, difficult to transport and require expert knowledge. A new smartphone application ( My Jump) claims to be a valid and reliable tool for assessing jump height but is yet to be evaluated by independent researchers. Sixty-one recreational athletes (30 male/31 female, mean ± SD; age: 20 ± 4 years) each performed three counter-movement jumps (totalling 183 jumps) on a force plate following a standardised wa

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Makaruk, Hubert. "ACUTE EFFECTS OF ROPE JUMPING WARM-UP ON POWER AND JUMPING ABILITY IN TRACK AND FIELD ATHLETES." Polish Journal of Sport and Tourism 20, no. 3 (2013): 200–204. http://dx.doi.org/10.2478/pjst-2013-0018.

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Abstract Introduction. The purpose of this study was to compare the acute effects of traditional jumps and rope jumps during warm-up on power and jumping ability in trained men. Material and methods. A group of 12 national-level track and field athletes participated in the study. Peak power and jumping ability were assessed by having participants perform five alternate leg bounds, a countermovement jump (CMJ) and a drop jump (DJ). Three different warm-up protocols were used in random order, with 3-day intervals between them. The first involved traditional jumps, the second rope jumps and the c

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Bogataj, Špela, Maja Pajek, Slobodan Andrašić, and Nebojša Trajković. "Concurrent Validity and Reliability of My Jump 2 App for Measuring Vertical Jump Height in Recreationally Active Adults." Applied Sciences 10, no. 11 (2020): 3805. http://dx.doi.org/10.3390/app10113805.

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This study aimed to examine the reliability, validity, and usefulness of the smartphone-based application, My Jump 2, against Optojump in recreationally active adults. Participants (18 women, 28.9 ± 5.6 years, and 26 men, 30.1 ± 10.6 years) completed squat jumps (SJ), counter-movement jumps (CMJ), and CMJ with arm swing (CMJAS) on Optojump and were simultaneously recorded using My Jump 2. To evaluate concurrent validity, jump height, calculated from flight time attained from each device, was compared for each jump type. Test-retest reliability was determined by replicating data analysis of My

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Isaacs, Larry D. "Comparison of the Vertec and Just Jump Systems for Measuring Height of Vertical Jump by Young Children." Perceptual and Motor Skills 86, no. 2 (1998): 659–63. http://dx.doi.org/10.2466/pms.1998.86.2.659.

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To assess differences between the Vertec and the Just Jump Systems in measuring height of vertical jump, 248 boys and 232 girls between 7 and 11 years were required to perform four maximal countermovement vertical jumps. A maximum of the four trials recorded was the dependent variable. Each vertical jump was simultaneously evaluated by each measuring device and a paired t test indicated the systems were significantly different; however, the experimentwise difference of .93 in. has no practical value. The Just Jump System seems a viable alternative. Advantages and potential pitfalls regarding t

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Castro, Alex, Márcio Fagundes Goethel, Edgar Ramos Vieira, et al. "EFFECTS OF WEARING AN ANKLE BRACE ON GROUND REACTION FORCES DURING JUMPS IN BASKETBALL GAME SIMULATION." Revista Brasileira de Medicina do Esporte 27, no. 2 (2021): 218–24. http://dx.doi.org/10.1590/1517-869220212702198345.

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ABSTRACT Introduction: The use of ankle braces reduces the risk of ankle injuries in basketball players. However, the mechanisms of injury protection provided by the ankle braces in the basketball game are still unknown. Objectives: To analyze the effects of wearing a lace-up ankle brace, and to conduct an exercise protocol that simulated the intensity of the basketball game on ground reaction force (GRF) during basketball-specific vertical jumps. Methods: Eleven male younger basketball players aged under 18 completed 48 vertical jumps, with and without ankle braces, during an exercise protoco

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Merino Fernández, María, Carlos Ruiz-Moreno, Verónica Giráldez-Costas, et al. "Caffeine Doses of 3 mg/kg Increase Unilateral and Bilateral Vertical Jump Outcomes in Elite Traditional Jiu-Jitsu Athletes." Nutrients 13, no. 5 (2021): 1705. http://dx.doi.org/10.3390/nu13051705.

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Caffeine increases vertical jump, although its effects on kinetics and kinematics during different phases of bilateral and unilateral jumps remain unclear. The aim of this study was to identify the effects of 3 mg/kg on kinetic, kinematic and temporal variables in the concentric and eccentric phases of bilateral and unilateral countermovement jumps. A total of 16 Spanish national team traditional Jiu-Jitsu athletes took part in two experimental trials (3 mg/kg caffeine or placebo) in a randomized, double-blind crossover study. Sixty minutes after ingestion, bilateral and unilateral jumps were

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Legg, Sonya, and Jody Klymak. "Internal Hydraulic Jumps and Overturning Generated by Tidal Flow over a Tall Steep Ridge." Journal of Physical Oceanography 38, no. 9 (2008): 1949–64. http://dx.doi.org/10.1175/2008jpo3777.1.

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Abstract Recent observations from the Hawaiian Ridge indicate episodes of overturning and strong dissipation coupled with the tidal cycle near the top of the ridge. Simulations with realistic topography and stratification suggest that this overturning has its origins in transient internal hydraulic jumps that occur below the shelf break at maximum ebb tide, and then propagate up the slope as internal bores when the flow reverses. A series of numerical simulations explores the parameter space of topographic slope, barotropic velocity, stratification, and forcing frequency to identify the parame

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Zare, H. K., and R. E. Baddour. "Three-dimensional study of spatial submerged hydraulic jump." Canadian Journal of Civil Engineering 34, no. 9 (2007): 1140–48. http://dx.doi.org/10.1139/l07-041.

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A three-dimensional (3D) study of spatial submerged hydraulic jumps (SSHJs) was carried out using a physical model for Froude numbers Fr1 = 2.00 and 3.75 and width ratios α = 0.20 and 0.33. Three orthogonal components of the velocity field were obtained with an acoustic Doppler velocimeter (ADV). The 3D velocity field has indicated that the jump consisted of a central jet-like flow, close to the channel bottom, surrounded by vertical and horizontal circulations (rollers). The circulation was predominantly in vertical planes in the channel central region of the flow and in horizontal planes clo

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Bobbert, Maarten F., L. J. Richard Casius, Igor W. T. Sijpkens, and Richard T. Jaspers. "Humans adjust control to initial squat depth in vertical squat jumping." Journal of Applied Physiology 105, no. 5 (2008): 1428–40. http://dx.doi.org/10.1152/japplphysiol.90571.2008.

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The purpose of this study was to gain insight into the control strategy that humans use in jumping. Eight male gymnasts performed vertical squat jumps from five initial postures that differed in squat depth (P1–P5) while kinematic data, ground reaction forces, and electromyograms (EMGs) of leg muscles were collected; the latter were rectified and smoothed to obtain SREMGs. P3 was the preferred initial posture; in P1, P2, P4, and P5 height of the mass center was +13, +7, −7 and −14 cm, respectively, relative to that in P3. Furthermore, maximum-height jumps from the initial postures observed in

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Skuodis, Šarunas, Arnoldas Norkus, Liudas Tumonis, Jonas Amšiejus, and Ceslovas Aksamitauskas. "EXPERIMENTAL AND NUMERICAL INVESTIGATION OF SAND COMPRESSION PECULIARITIES." Journal of Civil Engineering and Management 19, no. 1 (2013): 78–85. http://dx.doi.org/10.3846/13923730.2013.756164.

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Investigation of the compression properties of Klaipėda sand by oedometric testing and numerical modeling is presented. Klaipėda sand is characteristic of the Baltic seashore region sand. Experimental investigation was performed with fraction corresponding to diameter variation bounds of 0.6 and 0.425 mm. Compression test was realized with initial maximal void ratio (e 0 = 0.800) of sand. Employed vertical stress ramp value is 800.0 kPa/min, maximum loading σmax = 400.0 kPa. Applying loading within the range of 50.0 to 120.0, two vertical stress jumps have been identified. A rubber sample comp

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Gillen, Zachary M., Lacey E. Jahn, Marni E. Shoemaker, et al. "Effects of Eccentric Preloading on Concentric Vertical Jump Performance in Youth Athletes." Journal of Applied Biomechanics 35, no. 5 (2019): 327–35. http://dx.doi.org/10.1123/jab.2018-0340.

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This study measured peak force (PF), peak rate of force development (PRFD), peak power (PP), concentric impulse, and eccentric impulse during static jump (SJ), countermovement jump (CMJ), and drop jump (DJ) in youth athletes to examine changes in vertical jump power with progressively greater eccentric preloading in relation to age, maturity, and muscle mass. Twenty-one males ranging from 6 to 16 years old performed the following vertical jumps in a random order: SJ, CMJ, and DJ from drop heights of 20, 30, and 40 cm (DJ20, DJ30, and DJ40, respectively). Measurements included PF, PRFD, PP, ecc

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Tai, Wei-Hsun, Li-I. Wang, and Hsien-Te Peng. "Biomechanical Comparisons of One-Legged and Two-Legged Running Vertical Jumps." Journal of Human Kinetics 64, no. 1 (2018): 71–76. http://dx.doi.org/10.1515/hukin-2017-0185.

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Abstract The purpose of this study was to determine the differences in biomechanical characteristics between one- and two-legged running vertical jumps (1-LRVJ and 2-LRVJ). Ten male college volleyball players voluntarily participated in this study. Two running vertical jumps used in volleyball were randomly performed. Three trials for each type of the running vertical jump were recorded for each participant. Data were collected using six infra-red Qualisys motion-capture cameras at a 180-Hz sampling rate and two AMTI force platforms at an 1800-Hz sampling rate. Jump height in the 2-LRVJ was si

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Kinzey, Stephen J., Mitchell L. Cordova, Kevin J. Gallen, Jason C. Smith, and Justin B. Moore. "The Effects of Cryotherapy on Ground-Reaction Forces Produced during a Functional Task." Journal of Sport Rehabilitation 9, no. 1 (2000): 3–14. http://dx.doi.org/10.1123/jsr.9.1.3.

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Objective:To determine whether a standard 20-min ice-bath (10°C) immersion of the leg alters vertical ground-reaction-force components during a 1 -legged vertical jump.Design:A 1 × 5 factorial repeated-measures model was used.Setting:The Applied Biomechanics Laboratory at The University of Mississippi.Participants:Fifteen healthy and physically active subjects (age = 22.3 ± 2.1 years, height = 177.3 ± 12.2 cm, mass = 76.3 ± 19.1 kg) participated.Intervention:Subjects performed 25 one-legged vertical jumps with their preferred extremity before (5 jumps) and after (20 jumps) a 20-min cold whirlp

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Stephens, Thomas M., Brooke R. Lawson, Dale E. DeVoe, and Raoul F. Reiser. "Gender and Bilateral Differences in Single-Leg Countermovement Jump Performance with Comparison to a Double-Leg Jump." Journal of Applied Biomechanics 23, no. 3 (2007): 190–202. http://dx.doi.org/10.1123/jab.23.3.190.

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Expectations may be for both legs to function identically during single- and double-leg vertical jumps. However, several reasons might prevent this from occurring. The goals of this investigation were twofold: assess the presence of side-to-side jump height differences during single-leg jumps in a homogenous group of healthy subjects and determine if those with a jump height asymmetry possessed consistent biomechanical differences during single- and double-leg jumps. Thirteen men and 12 women with competitive volleyball experience volunteered for the study. Significance was assessed atp< 0.

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Bogdanis, Gregory C., Athanasios Tsoukos, and Panagiotis Veligekas. "Improvement of Long-Jump Performance During Competition Using a Plyometric Exercise." International Journal of Sports Physiology and Performance 12, no. 2 (2017): 235–40. http://dx.doi.org/10.1123/ijspp.2016-0116.

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Purpose:To examine the acute effects of a conditioning plyometric exercise on long-jump performance during a simulated long-jump competition.Methods:Eight national-level track and field decathletes performed 6 long-jump attempts with a full approach run separated by 10-min recoveries. In the experimental condition subjects performed 3 rebound vertical jumps with maximal effort 3 min before the last 5 attempts, while the 1st attempt served as baseline. In the control condition the participants performed 6 long jumps without executing the conditioning exercise.Results:Compared with baseline, lon

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Yamazaki, Y., M. Suzuki, and T. Mano. "Performance of noncountermovement jump with both knee and hip joints fully extended." Journal of Applied Physiology 66, no. 4 (1989): 1976–83. http://dx.doi.org/10.1152/jappl.1989.66.4.1976.

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The relationships between neuromuscular performance and biomechanical variables were studied in maximum vertical jumps to examine the factors influencing the performance of a noncountermovement jump. Keeping their knee and hip joint fully extended, five healthy subjects performed four kinds of noncountermovement jumps and one countermovement jump, during which ankle joint angle, platform force, and surface electromyograms of a triceps surae muscle were recorded. In the four noncountermovement jumps, the magnitude of activation and force at the onset of a shortening contraction of the triceps s

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Mandic, Radivoj, Olivera M. Knezevic, Dragan M. Mirkov, and Slobodan Jaric. "Control strategy of maximum vertical jumps: The preferred countermovement depth may not be fully optimized for jump height." Journal of Human Kinetics 52, no. 1 (2016): 85–94. http://dx.doi.org/10.1515/hukin-2015-0196.

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Abstract The aim of the present study was to explore the control strategy of maximum countermovement jumps regarding the preferred countermovement depth preceding the concentric jump phase. Elite basketball players and physically active non-athletes were tested on the jumps performed with and without an arm swing, while the countermovement depth was varied within the interval of almost 30 cm around its preferred value. The results consistently revealed 5.1-11.2 cm smaller countermovement depth than the optimum one, but the same difference was more prominent in non-athletes. In addition, althou

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Prieske, Olaf, Marie Demps, Melanie Lesinski, and Urs Granacher. "Combined Effects of Fatigue and Surface Instability on Jump Biomechanics in Elite Athletes." International Journal of Sports Medicine 38, no. 10 (2017): 781–90. http://dx.doi.org/10.1055/s-0043-111894.

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AbstractThe present study aimed to examine the effects of fatigue and surface instability on kinetic and kinematic jump performance measures. Ten female and 10 male elite volleyball players (18±2 years) performed repetitive vertical double-leg box jumps until failure. Pre and post fatigue, jump height/performance index, ground reaction force and knee flexion/valgus angles were assessed during drop and countermovement jumps on stable and unstable surfaces. Fatigue, surface condition, and sex resulted in significantly lower drop jump performance and ground reaction force (p≤0.031, 1.1≤d≤3.5). Ad

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Nuzzo, James L., Michael J. Cavill, N. Travis Triplett, and Jeffrey M. McBride. "A Descriptive Study of Lower-Body Strength and Power in Overweight Adolescents." Pediatric Exercise Science 21, no. 1 (2009): 34–46. http://dx.doi.org/10.1123/pes.21.1.34.

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The primary purpose of this investigation was to provide a descriptive analysis of lower-body strength and vertical jump performance in overweight male (n = 8) and female (n = 13) adolescents. Maximal strength was tested in the leg press and isometric squat. Kinetic and kinematic variables were assessed in vertical jumps at various loads. When compared with females, males demonstrated significantly greater (p ≤ .05) absolute maximal strength in the leg press. However, when maximal strength was expressed relative to body mass, no significant difference was observed. There were no significant di

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Čoh, Milan, Mitja Bračič, S. Peharec, P. Bačić, Milovan Bratić, and Marko Aleksandrović. "Biodynamic characteristics of vertical and drop jumps." Acta Kinesiologiae Universitatis Tartuensis 17 (December 1, 2012): 24. http://dx.doi.org/10.12697/akut.2011.17.02.

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VAN ZANDWIJK, JAN PETER, MAARTEN F. BOBBERT, MARTEN MUNNEKE, and PIETER PAS. "Control of maximal and submaximal vertical jumps." Medicine & Science in Sports & Exercise 32, no. 2 (2000): 477. http://dx.doi.org/10.1097/00005768-200002000-00033.

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Aeles, Jeroen, Glen Lichtwark, Dries Peeters, Christophe Delecluse, Ilse Jonkers, and Benedicte Vanwanseele. "Effect of a prehop on the muscle-tendon interaction during vertical jumps." Journal of Applied Physiology 124, no. 5 (2018): 1203–11. http://dx.doi.org/10.1152/japplphysiol.00462.2017.

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Many movements use stretch-shortening cycles of a muscle-tendon unit (MTU) for storing and releasing elastic energy. The required stretching of medial gastrocnemius (MG) tendinous tissue during jumps, however, requires large length changes of the muscle fascicles because of the lack of MTU length changes. This has a negative impact on the force-generating capacity of the muscle fascicles. The purpose of this study was to induce a MG MTU stretch before shortening by adding a prehop to the squat jump. Eleven well-trained athletes specialized in jumping performed a prehop squat jump (PHSJ) and a

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Rhouni, Nada, Nicole C. Dabbs, Trevor Gillum, and Jared W. Coburn. "Acute Effect of Mini-Trampoline Jumping on Vertical Jump and Balance Performance." International Journal of Kinesiology and Sports Science 7, no. 2 (2019): 1. http://dx.doi.org/10.7575/aiac.ijkss.v.7n.2p.1.

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Jumping and balance are necessary skills for most athletes, and mini-trampoline training has been shown to improve them. Little is known about the acute effect of mini-trampoline jumping on jump performance and dynamic balance. Objectives: The purpose of this study is to investigate the effect of 6 maximal jumps on a mini-trampoline on countermovement vertical jump (CMVJ) variables and on balance parameters. Methods: Twenty one recreationally trained individuals participated in three testing sessions and were either allocated to a control group (N=10) or a trampoline group (N=11). All the part

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Mazurkiewicz, Anna, Dagmara Iwańska, and Czesław Urbanik. "Biomechanics of the Axel Paulsen Figure Skating Jump." Polish Journal of Sport and Tourism 25, no. 2 (2018): 3–9. http://dx.doi.org/10.2478/pjst-2018-0007.

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Abstract Introduction. Figure skating is a sport discipline requiring a combination of artistic and athletic skills. The triple Axel Paulsen (Axel or A) jump is the most technically difficult jump of all figure skating jumps, which is why it is on the top of the International Skating Union (ISU) Judging System Code of Points (CoP). The purpose of this research was to explore the technical differences between the single Axel (1A), the double Axel (2A), and the triple Axel (3A) and to determine which parameters are the most important for performing the triple Axel successfully, using 3D kinemati

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