scholarly journals Evaluación de la velocidad, agilidad y fuerza en jóvenes jugadores de pádel (Speed, agility, and strength assessment in young padel players)

Retos ◽  
2018 ◽  
pp. 263-266
Author(s):  
Bernardino Javier Sánchez-Alcaraz Martínez ◽  
Vicente Orozco Ballesta ◽  
Javier Courel Ibáñez ◽  
Alejandro Sánchez Pay
Keyword(s):  
Linear Velocity ◽  
Test Results ◽  
Advanced Level ◽  
Strength Assessment ◽  
Linear Speed ◽  
Change Of Direction ◽  
Research Participants ◽  
Change Direction

El objetivo de este estudio es evaluar la velocidad de desplazamiento, la fuerza, y la agilidad en jóvenes jugadores de pádel, y analizar las diferencias en función del género. Los participantes de la investigación fueron 17 jugadores de pádel de nivel avanzado (8 chicos y 9 chicas) con edades comprendidas entre los 11 y los 16 años. Los jugadores completaron el test del hexágono, el de velocidad lineal de 10 y 20 metros y el de lanzamiento de balón medicinal. Los resultados mostraron que los jugadores de pádel masculinos presentaron unos tiempos significativamente inferiores que las participantes de género femenino en velocidad de sprint lineal, fuerza de tren superior y velocidad de cambio de dirección. Las variables de velocidad y velocidad de cambio de dirección correlacionan significativa y positivamente sí, mientras que la variable de fuerza correlaciona significativa y negativamente con las variables de velocidad de desplazamiento y velocidad de cambio de dirección. Abstract. The aim of this study is to evaluate lineal speed, strength, and agility in young padel players, and to analyse the differences by gender. The research participants were 17 advanced level padel players (8 boys and 9 girls) aged 11 to 16 years. Players completed the hexagon test, the 10-meter and 20-meter linear speed tests, and the medical ball throwing test. Results show that male paddle players present better scores than female participants in linear velocity, upper train force, and speed of change of direction. The variables of speed and change direction speed correlate significantly and positively, while strength correlates significantly and negatively with speed and change direction speed.

scholarly journals Relationship Between Toe Muscular Strength and the Ability to Change Direction in Athletes

2018 ◽  
Vol 64 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Yasuhiro Yuasa ◽  
Toshiyuki Kurihara ◽  
Tadao Isaka
Keyword(s):  
Muscular Strength ◽  
Metatarsophalangeal Joint ◽  
American Football ◽  
Football Players ◽  
Test Results ◽  
Change Of Direction ◽  
Change Direction ◽  
Toe Flexor Strength ◽  
The Relationship ◽  
Flexor Strength

Abstract This study aimed to investigate the relationship between toe muscular strength and the ability to change direction in athletes. Seventeen collegiate American-football players participated in the study (age 19.9 ± 0.9 years, competition experience 7.3 ± 1.7 years). Two types of measurements were performed to evaluate toe muscular strength: toe flexor strength with the metatarsophalangeal joint in the planter flexed position and toe-pushing force with the metatarsophalangeal joint in the dorsiflexed position. The ability to change direction was evaluated using the pro-agility and 3-cone tests and change of direction deficits, calculated by subtracting the sprint times from the pro-agility and 3-cone times. There were significant correlations between toe-pushing force and the results of the pro-agility and 3-cone tests, but no significant correlations between toe flexor strength and the pro-agility and 3-cone tests. Neither toe-pushing force nor toe flexor strength was significantly correlated with the sprint test results. Furthermore, toe-pushing force was significantly correlated with the 3-cone test deficit, but toe flexor strength was not. The ability to change direction is more strongly affected by toe muscular strength (measured as toe-pushing force) with the metatarsophalangeal joint in the dorsiflexed angle than by toe muscular strength (measured as toe flexor strength) with the metatarsophalangeal joint in the plantar flexed angle. Our results suggest that athletes can improve their ability to change direction with toe muscular strength training with the metatarsophalangeal joint in the dorsiflexed position.

PENGKAJIAN KEKUATAN BETON STRUKTUR JEMBATAN PASCA KEBAKARAN

2013 ◽  
Vol 12 (3) ◽  
Author(s):  
Sudarmadi Sudarmadi
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Strength Assessment ◽  
Concrete Testing

In this paper a case study about concrete strength assessment of bridge structure experiencing fire is discussed. Assessment methods include activities of visual inspection, concrete testing by Hammer Test, Ultrasonic Pulse Velocity Test, and Core Test. Then, test results are compared with the requirement of RSNI T-12-2004. Test results show that surface concrete at the location of fire deteriorates so that its quality is decreased into the category of Very Poor with ultrasonic pulse velocity ranges between 1,14 – 1,74 km/s. From test results also it can be known that concrete compressive strength of inner part of bridge pier ranges about 267 – 274 kg/cm2 and concrete compressive strength of beam and plate experiencing fire directly is about 173 kg/cm2 and 159 kg/cm2. It can be concluded that surface concrete strength at the location of fire does not meet the requirement of RSNI T-12-2004. So, repair on surface concrete of pier, beam, and plate at the location of fire is required.

scholarly journals Comparison of Change of Direction Speed Performance and Asymmetries between Team-Sport Athletes: Application of Change of Direction Deficit

Sports ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 174 ◽  
Author(s):  
Thomas Dos’Santos Christopher Thomas ◽  
Paul Comfort ◽  
Paul A. Jones
Keyword(s):  
Completion Time ◽  
Team Sports ◽  
Team Sport ◽  
Linear Speed ◽  
Change Of Direction ◽  
Directional Dominance ◽  
Speed Performance ◽  
Approach Velocity ◽  
Left And Right ◽  
The Relationship

The purpose of this study was twofold: (1) to examine differences in change of direction (COD) performance and asymmetries between team-sports while considering the effects of sex and sport; (2) to evaluate the relationship between linear speed, COD completion time, and COD deficit. A total of 115 (56 males, 59 females) athletes active in cricket, soccer, netball, and basketball performed the 505 for both left and right limbs and a 10-m sprint test. All team-sports displayed directional dominance (i.e., faster turning performance/shorter COD deficits towards a direction) (p ≤ 0.001, g = −0.62 to −0.96, −11.0% to −28.4%) with, male cricketers tending to demonstrate the greatest COD deficit asymmetries between directions compared to other team-sports (28.4 ± 26.5%, g = 0.19–0.85), while female netballers displayed the lowest asymmetries (11.0 ± 10.1%, g = 0.14–0.86). Differences in sprint and COD performance were observed between sexes and sports, with males demonstrating faster 10-m sprint times, and 505 times compared to females of the same sport. Male soccer and male cricketers displayed shorter COD deficits compared to females of the same sport; however, female court athletes demonstrated shorter COD deficits compared to male court athletes. Large significant associations (ρ = 0.631–0.643, p < 0.001) between 505 time and COD deficit were revealed, while trivial, non-significant associations (ρ ≤ −0.094, p ≥ 0.320) between COD deficit and 10-m sprint times were observed. In conclusion, male and female team-sport athletes display significant asymmetries and directional dominance during a high approach velocity 180° turning task. Coaches and practitioners are advised to apply the COD deficit for a more isolated measure of COD ability (i.e., not biased towards athletes with superior acceleration and linear speed) and perform COD speed assessments from both directions to establish directional dominance and create a COD symmetry profile.

scholarly journals Assessing the Magnitude and Direction of Asymmetry in Unilateral Jump and Change of Direction Speed Tasks in Youth Female Team-Sport Athletes

2021 ◽  
Vol 79 (1) ◽  
pp. 15-27
Author(s):  
Jordi Arboix-Alió ◽  
Chris Bishop ◽  
Ariadna Benet ◽  
Bernat Buscà ◽  
Joan Aguilera-Castells ◽  
...  
Keyword(s):  
Team Sports ◽  
Team Sport ◽  
Kappa Coefficient ◽  
Fitness Testing ◽  
Countermovement Jump ◽  
Linear Speed ◽  
Female Youth ◽  
Change Of Direction ◽  
Time Performance ◽  
The Relationship

Abstract The direction of inter-limb asymmetries and the change of direction (COD) deficit are two aspects that have increased in recent years. The main objective of the present study was to assess the magnitude of neuromuscular asymmetries in an elite youth female team-sports sample and determine its directionality. Secondary objectives were to evaluate the relationship between COD deficit, linear speed and COD time performance. Elite female youth basketball and handball players (n = 33, age = 16 ± 1.17 y) performed the Single Leg Countermovement Jump in vertical (SLCJ-V), horizontal (SLCJ-H), and lateral (SLCJ-L) directions, the COD and the 10-m sprint. Results showed statistical differences between limbs in all the neuromuscular tests (p < 0.001). The Kappa coefficient showed poor to fair levels of agreement between tasks (K range = -0.087 to 0.233), indicating that asymmetries rarely favoured the same limb between skills. Additionally, small and non-significant correlations were found between the linear sprint capacity and the COD ability. The findings of the present study highlight the independent directionality of asymmetries across tests. The COD deficit does not appear to be much more advantageous than COD total time to measure asymmetry. Practitioners are encouraged to use a fitness testing battery to detect existing side differences and each ability should be specifically trained with functional tasks.

scholarly journals Experiencing Differentiated Instructions as the Effort of Promoting Reading Comprehension Level

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Taufik Taufik
Keyword(s):  
Reading Comprehension ◽  
Differentiated Instruction ◽  
Educational System ◽  
English Learners ◽  
Descriptive Statistics ◽  
Test Results ◽  
Positive Experience ◽  
Flexible Grouping ◽  
Research Participants ◽  
Post Test

The current study explored the usefulness of differentiated instruction in the promotion of English learners reading comprehension in higher educational system. One TOEFL preparation class of a language center at University of Muhammadiyah Jember was chosen as the research participants. The students were taught through the strategies of differentiated instruction, viz. flexible grouping, tiered instruction, and tiered assignments, in the areas of content, process, and product. The outcomes of descriptive statistics from comparing pre-test and post-test results indicated that the students were having a positive experience with differentiated instruction in relation to their reading comprehension level. Further, the results also revealed that students also performed better in literal and inferential reading comprehension after experiencing differentiated instruction in the classroom.Keywords: differentiated instruction, reading comprehension.

scholarly journals Physical Qualities Pertaining to Shorter and Longer Change-of-Direction Speed Test Performance in Men and Women

Sports ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 45 ◽  
Author(s):  
Robert Lockie ◽  
Brett Post ◽  
J. Dawes
Keyword(s):  
Test Performance ◽  
Vertical Jump ◽  
Anaerobic Power ◽  
Regression Equations ◽  
Lower Body ◽  
Training Time ◽  
Linear Speed ◽  
Change Of Direction ◽  
Explained Variance ◽  
Lower Body Power

This study investigated relationships between shorter (505, change-of-direction (COD) deficit as a derived physical quality) and longer (Illinois agility test; IAT) COD tests with linear speed, lower-body power (multidirectional jumping), and strength in recreationally-trained individuals. Twenty-one males and 22 females (similar to collegiate club-sport and tactical athletes) were assessed in: 505 and COD deficit from each leg; IAT; 20 m sprint; vertical jump (VJ height, peak anaerobic power measured in watts (PAPw), power-to-body mass ratio); standing broad jump; lateral jump (LJ) from each leg; and absolute and relative isometric midthigh pull (IMTP) strength. Partial correlations calculated sex-determined relationships between the COD and performance tests, with regression equations calculated (p < 0.05). The 505 and IAT correlated with all tests except PAPw and absolute IMTP (r = ±0.43–0.71). COD deficit correlated with the LJ (r = −0.34–0.60). Left- and right-leg 505 was predicted by sex, 20 m sprint, and left-leg LJ (70–77% explained variance). Right-leg COD deficit was predicted by sex and left-leg LJ (27% explained variance). IAT was predicted by sex, 20 m sprint, right-leg LJ, and relative IMTP (84% explained variance). For individuals with limited training time, improving linear speed, and relative lower-body power and strength, could enhance shorter and longer COD performance.

Study on the Relationships between Offset Ink Tack Value and its Viscosity, the Separation Velocity

2011 ◽  
Vol 332-334 ◽  
pp. 1704-1708
Author(s):  
Yong Gang Yang ◽  
Fu Ping Liu
Keyword(s):  
High Viscosity ◽  
Linear Velocity ◽  
Linear Speed ◽  
Separation Velocity ◽  
Study Results ◽  
Printing Ink

In order to find out the variation law of ink stickiness during the printing, the ink tack value under 9 different linear velocities of ink distributing roller was tested, and the relation equations between tack value and the roller linear velocity were built up. At the same time, the plastic viscosities of 8 offset inks and their tack values under 9 separation velocities were also tested. The study results showed that the higher the linear speed was, the larger the tack value was, and it would stay in a relatively high tack value (regarded as infinite tack value). Also, the printing ink having high viscosity may possess low tack value.

scholarly journals DESIGN AND EXPERIMENT OF CENTRIFUGAL COLLISION TEST DEVICE FOR MILLET AND SWEET BUCKWHEAT GRAIN

2021 ◽  
pp. 193-202
Author(s):  
Jingxin Sun ◽  
Liqin Yang ◽  
Baohui Xu ◽  
Yuming Guo ◽  
Qingliang Cui ◽  
...  
Keyword(s):  
Moisture Content ◽  
Rotational Speed ◽  
Optimum Moisture Content ◽  
Linear Velocity ◽  
Rotary Table ◽  
Test Device ◽  
Linear Speed ◽  
Grain Crushing ◽  
Grain Moisture ◽  
Collision Force

This critical collision damage force of millet and sweet buckwheat grain and the shelling force of shelled granular materials are important basic data for research of threshing and shelling technology and equipment. In order to master the linear velocity and collision force of grain with different moisture content when collision damage occurs, a centrifugal collision test device is designed. Based on the dynamic and kinematic analysis of grain in the centrifugal rotary table, the collision force between grain and steel plate was measured by PVDF piezoelectric pressure sensor and data acquisition system. The results showed that: under the same moisture content, the higher the rotational speed, the higher the grain crushing rate; at the same rotational speed, with the increase of moisture content, the crushing rate first decreased and then increased. When the moisture content of Jingu-21 and Yuqiao-4 is 19.7% and 17.8%, respectively, the grain crushing rate was the lowest. In terms of the anti-collision ability of grain, the optimum moisture content of threshing is between 19.7% and 21% for millet. For sweet buckwheat, the optimum moisture content of threshing is 17.8% ~19%, while the optimum moisture content of shelling by centrifugal sheller is about 11%. The faster the rotational speed of centrifugal rotary table is, the greater the linear speed of grain is, and the greater the collision force is. When the linear velocity of grain was 8.32 m/s and 11.30 m/s respectively, the millet grain moisture content was 11.1% and 20.9% respectively, damage began to appear, and the corresponding collision force was about 5.51 N and 10.6 N, respectively. When the linear velocity of grain was 8.32 m/s and 11.30m/s respectively, and the moisture content was 11.1% and 22.8% of the sweet buckwheat grain respectively, damage began to appear, the corresponding collision force was about 8.92 N and 12.79 N, respectively. When the rotating speed of rotary table was 910 r/min, the linear speed of grain was 27.05 m/s, the crushing rate of millet and sweet buckwheat grain in harvest period were 56.30% and 63.76%, respectively, and the crushing rate of millet and buckwheat grain with 11.1% moisture content were 86.27% and 89.4%, respectively. The research results can provide theoretical basis for design and optimization of millet and sweet buckwheat combine harvester, threshing device and shelling device.

Effect of power on agility, linear speed and change of direction deficit in female soccer players

2021 ◽  
Vol 9 (1) ◽  
pp. 109-116
Author(s):  
Patricia Fischerova ◽  
Roksana Krosta ◽  
Artur Gołaś ◽  
Artur Terbalyan ◽  
Magdalena Nitychoruk ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Power ◽  
Body Height ◽  
Soccer Players ◽  
Linear Speed ◽  
Change Of Direction ◽  
Counter Movement Jump ◽  
Fitness Tests ◽  
The Difference ◽  
Better Than

Introduction: The aim of the study was to examine relationships between power of the lower limb and agility, speed, and change of direction (COD) deficit in professional female soccer players. Material and methods: Thirty-three elite Polish Extraliga league soccer players (aged 22 ±5 years; body height 166 ± 4 cm; body weight 58 ± 8 kg) performed the following fitness tests: lower limb muscle power (Leg Press, Half Squat, Counter Movement Jump), straight linear speed (SLS 20 m), and COD speed ( Zig-Zag test, COD deficit). Using the median value as a reference, the players were subdivided into two groups (n=17; n=16) according to their LP, HS 60% 1RM, CMJ (High values below median = stronger group and Low = weaker group ). Results: The COD deficit was calculated as the difference between the 20m speed and the Zig-Zag test. The stronger group was better than the weaker group in SLS 20m (p<0.05; ES=1.23; 0.83; 0.93), but in the Zig-Zag agility test, the difference in the results was not statistically significant (p>0.05; ES=0.48; 0.34; 0.34) and this affected the COD deficit, which was higher (p<0.05; ES=0.9; 0.73; 0.72). The most important finding was that the stronger group had a higher COD deficit and its improvement (reduction) occurs only if the results of the agility test are improved (through agility training) [Ydeficit All groups=0.10+0.87*20m - 0.83* Zig-Zag]. Increasing power (HS, LP) lead to the improvement in SLS p<0.05, not to COD abilities. Conclusion: This can be useful for coaches during agility training and to improve COD deficit in soccer players and women in general.

Sign in / Sign up

Export Citation Format

Share Document