scholarly journals The Kinematical Analysis of Blocking Skill in Volleyball and Their Relationships with the Explosive Force of Lower Limbs

2020 ◽  
pp. 73-79
Author(s):  
Hicham BENELGUEMAR ◽  
Sba BOUABDELLAH ◽  
Farıd MOUISSI
Keyword(s):  
Lower Limbs ◽  
Kinematical Analysis ◽  
Explosive Force

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

2021 ◽  
Vol 18 (15) ◽  
pp. 8228
Author(s):  
Anamaria Gherghel ◽  
Dana Badau ◽  
Adela Badau ◽  
Liviu Moraru ◽  
Gabriel Marian Manolache ◽  
...  
Keyword(s):  
Dynamic Balance ◽  
Lower Limbs ◽  
Experimental Program ◽  
Jump Height ◽  
Balance Study ◽  
Athletic Program ◽  
Tennis Players ◽  
Average Value ◽  
Explosive Force ◽  
Vertical Jumps

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.

scholarly journals Evaluación de la factibilidad de un sistema de entrenamiento combinado en el desarrollo de fuerza explosiva de los miembros inferiores de los taekwondocas (Assessment of the feasibility of a combined training system in the development of explosive streng

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 ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Training System ◽  
Lower Limbs ◽  
Test Protocol ◽  
Squat Jump ◽  
Combined Training ◽  
Explosive Strength ◽  
Post Test ◽  
Explosive Force ◽  
The Impact

 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.

Kinematical Analysis of Dismount of Double Salto Backwards Stretched with 2/1 Twists

2013 ◽  
Vol 312 ◽  
pp. 210-214
Author(s):  
Ji He Zhou
Keyword(s):  
Knee Joint ◽  
Hip Joint ◽  
Joint Angle ◽  
Lower Limbs ◽  
Horizontal Distance ◽  
Flight Phase ◽  
Knee Joint Angle ◽  
Kinematical Analysis ◽  
Kinematics Parameters ◽  
Improve Stability

The aim of this study was to revealed the top-notch gymnast Kai Zous dismount of double salto backwards stretched with 2/1 twist. The findings showed that (1) at flight phase, (a) kinematics parameters had slightly different at off-bar moment in 2011 and 2012, (b) flight posture fitted with gymnastic rules, (2) at landing phase, (a) the lower limbs of Kai Zou didnt stretch, it was unfavorable for the following buffering, (b) his hip joint angle was smaller and knee joint angle was larger after landing in 2012, and these were favorable for the finish of buffering element, it will increase the horizontal distance of C.G. and improve stability of landing, (c) mean hip joint angle was 117.9o at landing, the buffering time was 0.215s.

Mid-aortic syndrome: computed tomography angiography depicting extensive collateral circulation in an 11-year-old patient with thoracoabdominal aortic coarctation

VASA ◽  
2012 ◽  
Vol 41 (2) ◽  
pp. 132-135 ◽  
Author(s):  
Krohn ◽  
Gebauer ◽  
Hübler ◽  
Beck
Keyword(s):  
Computed Tomography ◽  
Computed Tomography Angiography ◽  
Collateral Circulation ◽  
Intestinal Ischemia ◽  
Clinical Presentation ◽  
Lower Limbs ◽  
Upper Body ◽  
Descending Aorta ◽  
Before And After ◽  
Blood Pressures

The mid-aortic syndrome is an uncommon clinical condition characterized by severe narrowing of the descending aorta, usually with involvement of its renal and visceral branches, presenting with uncontrollably elevated blood pressures of the upper body, renal and cardiac failure, intestinal ischemia, encephalopathy symptoms and claudication of the lower limbs, although clinical presentation is variable. In this article we report the case of an eleven-year-old patient with the initial diagnosis of a mid-aortic syndrome and present the computed tomography angiography pictures and reconstructions before and after surgical therapy.

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