scholarly journals Optimizing the Explosive Force of the Elite Level Football-Tennis Players through Plyometric and Specific Exercises

Author(s):  
Anamaria Gherghel ◽  
Dana Badau ◽  
Adela Badau ◽  
Liviu Moraru ◽  
Gabriel Marian Manolache ◽  
...  

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/right side jumps on the left/right leg; vertical jumps on both legs 60 s; BFS vertical jumps. For each test, the following parameters specific to the explosive force were statistically analyzed: contact time (s); flight time (s); jump height (cm), jump power (w/kg); RSI—Reactive Strength Index, defined as Height (m/s). In the study, the average value of the parameters specific to the jumps performed in each test was taken into account. During the study, the tests were performed and processed on the Opto Jump device and software. In all tests of the experiment monitored through Opto Jump, significant progress was made in the final test compared to the initial one, which demonstrates the efficiency of the physical training program implemented for the development of explosive force, with an impact on the sports performance of elite players. The most relevant results obtained for the left leg regarding the improvement of the explosive force of the lower limbs materialized in the jump height parameter was in the test of five vertical jumps on one leg on the spot, and for the right leg in the tests of: five back and forth jumps and five left/right side jumps. The most significant advances in the study were in the tests, in descending order of their weight: 60 s vertical jumps on both legs; five back-and-forth jumps and five left/right side jumps, five vertical jumps on one leg standing, and BFS vertical jumps.

2014 ◽  
Vol 20 (3) ◽  
pp. 303-309 ◽  
Author(s):  
Gleber Pereira ◽  
Paulo B. de Freitas ◽  
Jose A. Barela ◽  
Carlos Ugrinowitsch ◽  
André L. F. Rodacki ◽  
...  

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 increased as the exercise progressed. Non-significant effect of fatigue on movement synergy was found for the intersegmental coordination pattern. More than 90% of the intersegmental coordination was explained by one coordination pattern. Thigh rotation contributed the most to the intersegmental coordination pattern, with the trunk second and the shank the least. Therefore, one intersegmental coordination pattern is followed throughout the vertical jumps until fatigue and thigh rotation contributes the most to jump height.


Retos ◽  
2020 ◽  
pp. 411-420
Author(s):  
Lisbet Guillen Pereira ◽  
Angel Freddy Rodriguez Torres ◽  
Giovanny Capote Lavandero ◽  
Pablo Anthony Rendón Morales ◽  
María Elena Lagla Melendres ◽  
...  

 La investigación se centró en evaluar el impacto de un sistema de entrenamiento combinado para desarrollar la fuerza explosiva de los miembros inferiores de los taekwondocas, viene a reforzar el enfoque del desarrollo de la capacidad mediante una lógica metodológica que parte de la creación de las condiciones morfológicas y funcionales para asegurar la potenciación de una hipertrofia sarcoplasmática, como base del desarrollo de la hipertrofia sarcomérica y finalmente favorecer la conversión a potencia y el desarrollo de la fuerza explosiva, en concordancia se transitó por un diagnóstico, elaboración y validación, utilizando convenientemente métodos y técnicas como: entrevista, encuesta, observación, la prueba, la medición, el criterios de experto, la estadística descriptiva e inferencial y el pre-experimento, este último con tres momentos (pre-test/ intervención de 16 semanas/ post-test), participaron 20 taekwondocas universitarios Categoría Sénior y dos entrenadores. Se consideró la evaluación de la fuerza máxima (1RM) de los planos musculares que intervienen directamente en las técnicas de pateo, por estar asociada con la calidad del reclutamiento de la fibras motoras; la evaluación de la fuerza explosiva se realizó mediante el test de salto vertical: Squat Jump (SJ) extraído del protocolo del test de Bosco, para ello fue necesario emplear una plataforma de contacto digital. Los datos se compararon mediante una prueba T de diferencias de medias, cuyos resultados mostraron cambios significativos (p= .000) entre el pre y post tratamiento, verificándose Hi, concluyendo que el sistema de entrenamiento combinado mejoró el desarrollo de la fuerza explosiva de los miembros inferiores de los taekwondocas.  Summary: The research focused on assessing the impact of a combined training system to develop the explosive strength of the lower limbs of the taekwondoins. It wants to reinforce the approach of capacity development through a methodological logic that starts from the creation of morphological and functional conditions to ensure the enhancement of a sarcoplasmic hypertrophy, as a basis for the development of sarcomeric hypertrophy, and finally, favor the conversion to power and the development of the explosive force. At the same time, it went through a diagnosis, elaboration and data validation, using propper methods and techniques such as: interview, survey, observation, testing, measurement, expert criteria, descriptive and inferential statistics, and the pre-experiment. The last one with three stages (pre-test / 16-week intervention / post-test) Twenty senior category university taekwondoins and two coaches participated. The evaluation of the maximum force (1RM) of the muscular planes that directly influence in the kicking techniques was considered. As it was associated to the quality of motor fiber recruitment; The evaluation of the explosive force was performed using the vertical jump test: Squat Jump (SJ) extracted from the Bosco test protocol. For this, it was necessary to use a digital contact platform. The data were compared using a T-test, the results of which showed significant changes (p = .000) between the pre and post treatment, verifying Hi. Concluding that the combined training system improved the development of the explosive strength of the limbs lower of the taekwondoinst.


2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Xiquan Weng ◽  
Chaoge Wang ◽  
Yan Meng ◽  
Guoqin Xu

Objective Through testing and analysis the characteristics of body shape,body composition,bone growth and physical fitness,hemoglobin, testosterone of 6-7 years old female preselected tennis players,the study aim was to provide reference bases for the early selection of female tennis players. Methods A total of 75 female preselected tennis players(initial selection by the coaches) aged from 6 to 7 years were came from Hebei, Hubei, Qinghai and Inner Mongolia province, who came to Research Center for Heath related Physical Fitness Evaluation of Guangzhou Sport University for physical fitness test from July 2016 to July 2018. The height, weight, length of upper limbs, length of lower limbs, iliac width, shoulder width, body fat, muscle mass, bone age,bone mass density(BMD), anaerobic power and PWC170, reaction time, vertical jump, grip strength, hemoglobin, testosterone were measured using related instruments and methods, and calculated derived indicators BMI, iliac width/shoulder width. Data were compared with the national standard of physical health of students and/or evaluated by deviation method,and correlation had been analysed among physical parameters. Results 1)The 75 female preselected tennis players’ aged from 6 to 7 years height and weight were 128.10±5.32cm and 25.70±3.87kg,and there are 47 girls height upper medium grade level, 60% of which weight was at a moderate level, their BMI were 15.48±1.50kg/m2,and all in the normal range, iliac width/shoulder width ×100 was 76.52±7.00, 70.7% 0f which was above medium grade level, the upper and lower limbs were 54.28±3.60cm and 71.68±5.26cm, girls’ PBF were 21.03±6.44, muscle weight were 18.94±3.00kg, BMD were 2.04±2.20, and no low bone strength were fund; Anaerobic power of all female preselected tennis players were 135.93±31.65kg.cm, and the values of the PWC170 relative weight were 10.79±2.56kg.m/min.kg, reaction time were 0.628±0.128s, vertical jump were 21.13±4.95cm, the grip of right and left hand were 10.36±2.15kg and 10.06±2.40kg, the physical fitness parameters above in the upper middle class were more girls than the lower middle class; The hemoglobin content was 132.15±8.70g/L, which was above the normal level (110 -160g/L), the serum testosterone concentration was 1.52±1.20umol/L, which was much higher than that of normal girls (0-0.7umol/L). 2) When age was controlled, there was negative correlation between T and PFB, vertical jump and body weight, PWC170 and reaction time(P<0.05), and there was positive correlation between hemoglobin and muscle weight(P<0.05), height, and vertical jump(P<0.01), muscle weight and anaerobic power(P<0.01),anaerobic power and height,weight,BMI,upper and lower limbs(P<0.01, P<0.01, P<0.01, P<0.05, P<0.01),PWC170 and vertical jump,the grip of right and left hand(P<0.01, P<0.05, P<0.05), vertical jump and upper, lower limbs, iliac width/shoulder width(P<0.01, P<0.01, P<0.01). Conclusions 75 female aged from 6 to 7 years old preselected tennis players’ body shape, physical fitness, physiological and biochemical function were superior to peers, and in those parameters,there were more people in upper middle grade than  lower middle grade. There is a certain correlation between body composition, shape and fitness of female preselected tennis players’ aged from 6 to 7 years.


2012 ◽  
Vol 34 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Karine Babel Copaver ◽  
Claude Hertogh ◽  
Olivier Hue

Abstract Afro-Caribbean sprinters often reach high performance levels at an early age. Adolescence is a time of morphological and physiological changes. This study was designed to analyze the evolution in parameters of short sprint performance during adolescence in Afro-Caribbean boys, especially the stride number/body height ratio (SN/BH), which is at the interface of technical and morphological factors. Seventy-one 13-year-old boys performed vertical jumps and short sprint races. The races were filmed with a view to determine stride variables. Anthropometric parameters were also measured. The same tests were performed two years later. Body height and SN/BH were the main predictors of sprint performance. The delta of performance was principally explained by stride length and stride number. Although deterioration in technical parameters was expected, the parameters related to body size and stride length were the main sprint performance predictors rather than explosive force. These results could be useful in developing tests to detect sprint potential in youth.


2010 ◽  
Vol 26 (4) ◽  
pp. 508-511 ◽  
Author(s):  
Loren Z.F. Chiu ◽  
George J. Salem

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 motion analysis system and two force platforms. The pelvis center of mass was reconstructed from retro-reflective markers placed on the pelvis. Jump height was determined from the peak height of the pelvis center of mass minus the standing height. Strong linear relationships were observed between the pelvic kinematic and impulse methods (R2= .86;p< .01). The pelvic kinematic method underestimated jump height versus the impulse method, however, the difference was small (CV = 4.34%). This investigation demonstrates concurrent validity for the pelvic kinematic method to determine vertical jump height.


2011 ◽  
Vol 5 (1) ◽  
pp. 117-124
Author(s):  
Lenka Svobodová ◽  
Jitka Kopřivová ◽  
Dagmar Šimberová

The case study deals with the infl uence of six months intervention program onto the change of the level of static and dynamic balance, orientation in the space and the strength of lower limbs at selected individuals in the period of seniority. Th ese abilities are considered to be limiting in the life of seniors. Th e complex was created by four individuals, two men and two women at the age of 88, 83, 81, 82. Th e needed datas to judge the level of monitoring locomotive abilities we obtained before and aft er fi nishing locomotive intervention by the help of six choosen standard motoric test. Th is intervention locomotive programme lasted for six months, it was carried out twice a week always 60 minutes. We were looking for some information regarding state of health and lifestyle, which could infl uence observed abilities at individuals. The level of static balance got worse at three individuals also aft er pointed exercises. Th is ability was proved as the most susceptible by health problems and by evolutionary process. At any of individuals wasn´t proved any decreasing of the level of dynamic balance, space orientation or the strength of lower limbs. It is not possible to generalize the fi ndings but they are the proves of contribution to the quality of life by the individually choosen intervention.


Retos ◽  
2020 ◽  
pp. 300-305
Author(s):  
Carlos Véliz Véliz ◽  
Fernando Maureira Cid ◽  
Marcela Jaurés Rodríguez

Entre las múltiples variables que condicionan el rendimiento en pruebas de natación resalta la fuerza explosiva y la potencia, ambos predictores confiables de la velocidad del nadador. El objetivo del presente estudio fue determinar la relación de la fuerza, potencia y variables antropométricas con el tiempo mínimo en nadadores jóvenes. La muestra estuvo constituida por 27 nadadores de Santiago de Chile, 14 de sexo masculino (51,9%) y 13 de sexo femenino (48,1%), con edades entre 13 y 21 años. Los datos de antropometría se obtuvieron con el protocolo ISAK, utilizando una balanza digital Tanita modelo HD 357 y el kit Rosscraft Centurion. Para medir la altura de salto se utilizó la plataforma de contacto DmJump®. La medición de fuerza a través del press banco, prensa horizontal y pull down se llevó a cabo con una repetición máxima. Finalmente, la medición de la fuerza de prensión manual se realizó con un dinamómetro digital baseline®. Los resultados muestran que los tiempos obtenidos en 50 metros de nado libre presentan relaciones inversas con cuatro variables antropométricas, con la altura del Abalakov Jump y con cuatro pruebas de fuerza. La prueba de 50, 100 y 200 metros estilo pecho solo se relacionan con la fuerza de prensión de la mano. La prueba de 200 metros combinado se relaciona con cinco variables antropométricas, con la altura de salto del CMJ y con las cinco pruebas de fuerza. Son necesarias nuevas investigaciones donde se evalué un mayor número de deportistas, con mayores rangos etarios y diversos tiempos y tipos de entrenamiento que puedan ayudar a entender de mejor forma la incidencia de estas variables sobre el rendimiento deportivo.Abstract. Explosive force and power stand out among the multiple variables that condition performance in swimming tests, both being reliable predictors of swimmers' speed. The aim of this study was to determine the relationship of force, power, and anthropometric variables with the shortest performance time in young swimmers. The sample consisted of 27 swimmers from Santiago de Chile, 14 male (51.9%) and 13 female (48.1%) with ages between 13 and 21 years old.The anthropometric data were obtained with the ISAK protocol, using a digital scale Tanita model HD 357 and the Rosscraft Centurion kit. To measure the jump height, the contact platform DmJump® was used. Force was measured through press bench, horizontal press, and pull down, using the one maximum repetition method.Finally, measurement of manual grip force was carried out with a digital dynamometer baseline®. The results show that the times obtained in 50 meters of free swimming have inverse relationships with four anthropometric variables, with the height of the Abalakov Jump and with four force tests.The 50, 100 and 200-meter breaststroke tests only correlate with hand grip force. The combined 200-meter test is associated with five anthropometric variables, jump height in CMJ, and the five force tests. In future research, a greater number of athletes should be evaluated, with higher age ranges and different training times and types, which could help better understand the influence of these variables on sports performance.    


2020 ◽  
Vol 12 (3) ◽  
pp. 35-46
Author(s):  
DONG-SIK OH ◽  
YOON-HEE CHOI ◽  
YU-JIN SHIM ◽  
SAM-HO PARK ◽  
MYUNG-MO LEE

Background: The aim of this study was to examine the concurrent validity and inter-and intra-rater reliabilities of smart device based application, against force platform-based portable device Wii balance board (WBB) measurements for the flight time and jump height during the vertical jump. Material and methods: Thirty participants (23.8 ±3.41 years) completed three vertical jumps, which were evaluated using WBB and application for smart device. To assess the concurrent validity, jump height and flight times were obtained from each device. Inter-and intra-rater reliabilities were determined by replicating data analysis of smart device based application recordings. Results: Flight time and jump height collected from smart device based application showed excellent agreement level with WBB (flight time and jump height: ICC [2,1]=0.972). However mean flight time and jump height from the smart device based application was significantly higher than WBB (mean difference: 0.006 sec, 0.745 cm, p < 0.05). Intra-rater sessions showed good level of agreement (flight time: ICC [2,1] = 0.967, jump height: ICC [2,1] = 0.974), and inter-rater session showed almost perfect reliability (flight time: ICC [2,1] = 0.985, jump height: ICC [2,1] = 0.987). Conclusions: Smart device-based applications could be used to replace pressure-based portable devices for clinical evaluations in post-injury rehabilitation as well as evaluating sports performance.


2018 ◽  
Vol 34 (4) ◽  
pp. 291-297 ◽  
Author(s):  
John R. Harry ◽  
Max R. Paquette ◽  
Brian K. Schilling ◽  
Leland A. Barker ◽  
C. Roger James ◽  
...  

This study sought to identify kinetic and electromyographic subphase characteristics distinguishing good from poor jumpers during countermovement vertical jumps (CMVJs), as defined by the reactive strength index (RSI, CMVJ displacement divided by jump time; cutoff = 0.46 m·s−1). A total of 15 men (1.8 [0.6] m, 84.5 [8.5] kg, 24 [2] y) were stratified by RSI into good (n = 6; RSI = 0.57 [0.07] m·s−1) and poor (n = 9; RSI = 0.39 [0.06] m·s−1) performance groups. The following variables were compared between groups using independentttests (α = .05) and Cohen’sdeffect sizes (d ≥ 0.8, large): jump height, propulsive impulse, eccentric rate of force development, and jump time, unloading, eccentric, and concentric subphase times, and average electromyographic amplitudes of 8 lower extremity muscles. Compared with the poor RSI group, the good RSI group exhibited a greater, though not statistically different CMVJ displacement (d = 1.07,P = .06). In addition, the good RSI group exhibited a significantly greater propulsive impulse (P = .04,d = 1.27) and a significantly more rapid unloading subphase (P = .04,d = 1.08). No other significant or noteworthy differences were detected. Enhanced RSI appears related to a quicker unloading phase, allowing a greater portion of the total jumping phase to be utilized generating positive net force. Poor jumpers should aim to use unloading strategies that emphasize quickness to enhance RSI during CMVJ.


Retos ◽  
2020 ◽  
pp. 182-190
Author(s):  
Isabel Adriana Sánchez Rojas ◽  
Laura Elizabeth Castro Jiménez ◽  
Yenny Paola Argüello Gutiérrez ◽  
Angela Jazmín Gálvez ◽  
Paula Janyn Melo Buitrago

 El objetivo del estudio fue realizar una comparación entre dermatoglifia dactilar y los datos morfofuncionales en jugadores de fútbol profesional. Se contó con una población de 24 jugadores del fútbol profesional colombiano con edad promedio de 21 ± 1.99 años; talla 177.3 ± 4.3 cm; peso 73.21 ± 6.42 kg, integrantes de la selección masculina profesional del equipo de fútbol Fortaleza de la ciudad de Bogotá, Colombia. Se realizó una caracterización descriptiva de las variables de estudio (dermatoglifia, composición corporal, fuerza explosiva, fuerza máxima y consumo de oxígeno); posteriormente, se realizó el contraste de normalidad de los datos mediante prueba de Shapiro–Wilk y finalmente se aplicó un análisis bivariado. Los resultados evidenciaron la presencia de correlaciones fuertes entre la fuerza y la potencia máxima pico y el consumo máximo de oxígeno (p=.737; p=.699); así como entre la altura del salto como el potencial de energía (p=.952) y una correlación negativa entre la altura del salto y el porcentaje de masa grasa (p=-.554). Los marcadores dermatoglíficos, evidenciaron que la población de futbolistas evaluados tuvo comportamientos similares comparados con estudios internacionales y nacionales. Finalmente se identificaron relaciones importantes entre variables asociadas con fuerza, potencia, VO2máx, altura de salto y porcentaje de masa grasa como elementos determinantes del rendimiento óptimo del futbolista. Abstract. The objective of the study was to make a comparison between dermatoglyphic dactilar and morpho functional data in professional football players. It had a population of 24 players of Colombian professional football with an average age of 21 ± 1.99 years; size 177.3 ± 4.3 cm; weight 73.21 ± 6.42 kg, members of the men's team of the Fortaleza football team of the city of Bogotá, Colombia. A descriptive characterization of the study variables (dermatoglyphic, body composition, explosive force, maximum force and oxygen consumption) was performed; posteriorly, the normality contrast of the data was performed by Shapiro–Wilk test and a bivariate analysis was finally applied. The results showed the presence of strong correlations between the force and the maximum peak power and the maximum oxygen consumption (p=.737; p=.699); as well as between the height of the jump as the energy potential (p=.952) and a negative correlation between the jump height and the percentage of fat mass (p= -.554). The dermatoglyphic markers showed that the population of footballers evaluated had similar behaviors compared to international and national studies. Finally, important relationships were identified between variables associated with strength, power, VO2max, jump height and percentage of fat mass as determining the optimal performance of the footballer.


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