scholarly journals ANALYSIS OF THE DEPENDENCE BETWEEN JUMPING TAKEOFF AND ANTHROPOMETRIC INDICATORS OF FEMALE FIGURE SKATERS

2020 ◽  
Vol 2 (2020) ◽  
pp. 89-104
Author(s):  
Tatiana Yordanova ◽  
Keyword(s):  
Research Methods ◽  
Vertical Jump ◽  
Research Work ◽  
Correlation Coefficients ◽  
Young Female ◽  
Lower Limbs ◽  
Female Figure ◽  
Anthropometric Indicators ◽  
Figure Skaters ◽  
Level Of Training

ABSTRACT Jump Elements in figure skating are an integral part of motor activity. One of the conditions for their good performance is great height and length. Criteria for this are the indicators of speed and power qualities. The aim of this research work is to analyze the relationship between anthropometric indicators and those for jumping takeoff of young female figure skaters of the basic level of training. Seventeen female skaters aged 10-14 years old (prepuberty) from ice skating clubs in Bulgaria voluntarily participated in the study. The age of the participants was 10 to14 years old, which is considered favorable for the development of speed and strength abilities. They were subjected twice to 8 anthropometric measurements and 5 different types of takeoff, conducted in office conditions. To achieve the goal of the survey, the following research methods were used: theoretical analysis and generalization of data in specialized scientific and methodological literature, pedagogical observation, pedagogical testing, anthropometric research methods and methods of mathematical statistics for processing the results of the study. The results showed significant intragroup dependences for the anthropometric and bio- mechanical parameters for all types of jumps takeoff in the first study and a decrease in the correlation coefficients in the second measurement. The maximum force in all types of jumps increases with increasing indicators of height, weight, length of the lower limbs, chest circumference, shoulder width, while the width of the pelvis does not affect the strength of the takeoff. The height of the jumps with the help of the arms depends on the width of the shoulders – r = 0.497, and for vertical jump with the hands on the hips – r = 0.664.

Speed running is determined by strength and power in young football players

2020 ◽  
Vol 10 (1) ◽  
pp. 23-27
Author(s):  
Piotr Kuczek ◽  
Beata K. Nowak
Keyword(s):  
Vertical Jump ◽  
Age Groups ◽  
Lower Limbs ◽  
Football Players ◽  
Strong Positive Correlation ◽  
Motion Speed ◽  
Level Of Training ◽  
The Relationship ◽  
Basic Level ◽  
Individual Motor

Introduction: For years researchers and trainers have been looking for determinants of sports talent in the youngest and also in the relationship between individual motor features relevant in given sport disciplines. There is a fundamental consensus in the opinion that the strength and power of the lower limbs are correlated with the speed of running. However, this relationship also among the youngest is not so clear. The purpose of the work was to show the relationship between strength and power generated during vertical jump and achieved height jump and the speed of flat running in the youngest footballers. Material and methods: The research covered 75 children training football at the age of 6–14 years divided into two age groups. The subjects made a countermovement jump on a dynamometric platform measuring strength, power, speed of rebound and the height obtained, after which they performed a flying run over a distance of 20 m. Results: A strong, positive correlation was demonstrated between all dynamic and kinetic parameters of the jump and running speed. This correlation turned out to be clearly stronger in the older group of football players than in the younger group. Conclusions: The obtained results suggest that strength and power are good predictors, such an important feature in football as the player’s motion speed, already at the basic level of training.

THE INFLUENCE OF MUSCLE TIGHTNESS OF LOWER EXTREMITIES ON LOW BACK PAIN IN YOUNG FEMALE FIGURE SKATERS

2014 ◽  
Vol 48 (7) ◽  
pp. 560.1-560
Author(s):  
A Abe ◽  
K Sato ◽  
S Mitsueda ◽  
M Kimura ◽  
E Hirooka ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Lower Extremities ◽  
Young Female ◽  
Low Back ◽  
Female Figure ◽  
Figure Skaters ◽  
Muscle Tightness

Improving the Computational Cost for Copied Region Detection in Forensic Images

2016 ◽  
Vol 2 (1) ◽  
pp. 55
Author(s):  
Tu Huynh-Kha ◽  
Thuong Le-Tien ◽  
Synh Ha ◽  
Khoa Huynh-Van
Keyword(s):  
Wavelet Transform ◽  
Euclidean Distance ◽  
Research Work ◽  
Computational Cost ◽  
Correlation Coefficients ◽  
Zernike Moments ◽  
Computational Time ◽  
Discrete Wavelet ◽  
Feature Vectors ◽  
Region Detection

This research work develops a new method to detect the forgery in image by combining the Wavelet transform and modified Zernike Moments (MZMs) in which the features are defined from more pixels than in traditional Zernike Moments. The tested image is firstly converted to grayscale and applied one level Discrete Wavelet Transform (DWT) to reduce the size of image by a half in both sides. The approximation sub-band (LL), which is used for processing, is then divided into overlapping blocks and modified Zernike moments are calculated in each block as feature vectors. More pixels are considered, more sufficient features are extracted. Lexicographical sorting and correlation coefficients computation on feature vectors are next steps to find the similar blocks. The purpose of applying DWT to reduce the dimension of the image before using Zernike moments with updated coefficients is to improve the computational time and increase exactness in detection. Copied or duplicated parts will be detected as traces of copy-move forgery manipulation based on a threshold of correlation coefficients and confirmed exactly from the constraint of Euclidean distance. Comparisons results between proposed method and related ones prove the feasibility and efficiency of the proposed algorithm.

scholarly journals Estimation of Human Center of Mass Position through the Inertial Sensors-Based Methods in Postural Tasks: An Accuracy Evaluation

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 601 ◽  
Author(s):  
Marco Germanotta ◽  
Ilaria Mileti ◽  
Ilaria Conforti ◽  
Zaccaria Del Prete ◽  
Irene Aprile ◽  
...  
Keyword(s):  
Inertial Sensors ◽  
Center Of Mass ◽  
Correlation Coefficients ◽  
Biomechanical Model ◽  
Lower Limbs ◽  
Accuracy Evaluation ◽  
Postural Tasks ◽  
Single Sensor ◽  
Using Data ◽  
Displacement Based

The estimation of the body’s center of mass (CoM) trajectory is typically obtained using force platforms, or optoelectronic systems (OS), bounding the assessment inside a laboratory setting. The use of magneto-inertial measurement units (MIMUs) allows for more ecological evaluations, and previous studies proposed methods based on either a single sensor or a sensors’ network. In this study, we compared the accuracy of two methods based on MIMUs. Body CoM was estimated during six postural tasks performed by 15 healthy subjects, using data collected by a single sensor on the pelvis (Strapdown Integration Method, SDI), and seven sensors on the pelvis and lower limbs (Biomechanical Model, BM). The accuracy of the two methods was compared in terms of RMSE and estimation of posturographic parameters, using an OS as reference. The RMSE of the SDI was lower in tasks with little or no oscillations, while the BM outperformed in tasks with greater CoM displacement. Moreover, higher correlation coefficients were obtained between the posturographic parameters obtained with the BM and the OS. Our findings showed that the estimation of CoM displacement based on MIMU was reasonably accurate, and the use of the inertial sensors network methods should be preferred to estimate the kinematic parameters.

scholarly journals Analyzing the Magnitude of Interlimb Asymmetries in Young Female Soccer Players: A Preliminary Study

2021 ◽  
Vol 18 (2) ◽  
pp. 475
Author(s):  
Javier Raya-González ◽  
Filipe Manuel Clemente ◽  
Daniel Castillo
Keyword(s):  
Range Of Motion ◽  
Muscle Mass ◽  
Injury Risk ◽  
Young Female ◽  
Asymmetry Index ◽  
Lower Limbs ◽  
Soccer Players ◽  
Countermovement Jump ◽  
Change Of Direction ◽  
Jump Ability

Although asymmetries in lower limbs have been linked with players’ performance in male soccer players, literature that has been published addressing female soccer is scarce. Thus, the aim of this study was twofold: (i) describe the asymmetries of women soccer players during jumping, change-of-direction and range-of-motion tests; and (ii) test possible relationships between asymmetries and injury risk in female soccer players. Sixteen female players (15.5 ± 1.5 years) performed a battery of fitness tests (i.e., jump ability, change-of-direction ability and passive range-of-motion) and muscle mass analysis via dual-energy X-ray absorptiometry, through which the specific asymmetry index and the related injury risk were calculated. Significant (p < 0.05) lower asymmetries in the change-of-direction test were observed in comparison to those observed in jumping and range-of-motion tests; significant (p < 0.05) lower asymmetries in muscle mass were also reported compared to those found in the change-of-direction and countermovement jump tests. Additionally, increased injury risk for countermovement jump and hip flexion with extended knee range-of-motion (relating to asymmetry values) and for ankle flexion with flexed knee range-of-motion in both legs (relating to reference range-of-motion values), as well as increased individual injury risk values, were observed across all tests. These findings suggest the necessity to implement individual approaches for asymmetry and injury risk analyses.

Strength, Power, and Aerobic Exercise Correlates of 5-km Cross-Country Running Performance in Adolescent Runners

2006 ◽  
Vol 18 (3) ◽  
pp. 374-384 ◽  
Author(s):  
Andrew S. Cole ◽  
Megan E. Woodruff ◽  
Mary P. Horn ◽  
Anthony D. Mahon
Keyword(s):  
Muscle Power ◽  
Pearson Correlation ◽  
Vertical Jump ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Correlation Coefficients ◽  
Knee Extension ◽  
Running Economy ◽  
Running Performance ◽  
Cross Country

Relationships between physiological parameters and 5-km running performance were examined in 15 male runners (17.3 ± 0.9 years). Running economy (RE) and blood lactate concentration ([BLa]) at 241.2 m/min, VO2max, velocity at VO2max (vVO2max), vertical jump height and muscle power, and isokinetic knee extension strength at 60°/sec and 240°/sec were measured. The participants’ best 5-km race time over the last month of the cross-country season (16.98 ± 0.76 min) was used in the analysis. The data were analyzed using Pearson correlation coefficients. Significant relationships to run time were observed for VO2max (r = -.53), RE (r = .55), and vVO2max (r = -.66), but not [BLa], isokinetic muscle torque, or vertical jump. Identifying the unique strength and power characteristics related to running performance in this age group is warranted.

scholarly journals Portable Force Plates: A Viable and Practical Alternative to Rapidly and Accurately Monitor Elite Sprint Performance

Sports ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 61 ◽  
Author(s):  
Irineu Loturco ◽  
Lucas Pereira ◽  
Ronaldo Kobal ◽  
Cesar Cal Abad ◽  
Victor Fernandes ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Force Plate ◽  
Correlation Coefficients ◽  
Accurate Information ◽  
Strong Correlations ◽  
Regression Analyses ◽  
Actual Performance ◽  
Moment Coefficient ◽  
Competitive Athletes ◽  
Vertical Jumps

This study aimed to examine the associations between a series of mechanical variables automatically generated by a portable force plate (PFP) and the actual performance of professional sprinters over a 150 m course. To test these correlations, 12 top-level sprinters performed vertical jumps (squat and countermovement jumps; SJ and CMJ, respectively), a 60 m sprint test, and a 150 m sprint test. Pearson product-moment coefficient of correlation and multiple regression analyses were used to determine the relationships between the sprinting velocities and vertical jump outputs. The SJ parameters were moderately to near perfectly associated with the different sprint distances, and the SJ height presented the highest correlation scores (r = 0.90 with velocities over 10- and 20-m). The correlation coefficients between the CMJ outcomes and sprint results varied between moderate and very large (from 0.38 to 0.88). Finally, the coefficients of determination (R2) ranged from 0.71 to 0.85 for the different multiple regressions involving PFP automatic measures. The PFP can provide practitioners with quick and accurate information regarding competitive athletes. Due to the strong correlations observed, coaches are encouraged to frequently adjust and tailor the training strategies of their sprinters, using practical and timesaving PFP measurements.

scholarly journals Influence of prevalent occupational position during working day on occupational lower limb edema

2015 ◽  
Vol 14 (2) ◽  
pp. 153-160 ◽  
Author(s):  
Cleusa Ema Quilici Belczak ◽  
José Maria Pereira Godoy ◽  
Amélia Cristina Seidel ◽  
Rubiana Neves Ramos ◽  
Sergio Quilici Belczak ◽  
...  
Keyword(s):  
Lower Limb ◽  
Skin Color ◽  
Correlation Coefficients ◽  
Cumulative Effect ◽  
Study Groups ◽  
Lower Limbs ◽  
Volume Increase ◽  
Occupational Position ◽  
Limb Edema ◽  
Working Day

BACKGROUND: The lower limb edema observed in normal people at the end of their working days can vary in intensity and frequency depending on the predominant working positions required to perform different jobs.OBJECTIVES: To compare lower limb volumes of volunteers allocated to three study groups, depending on the predominant positions in which they work.METHODS: Volumetric assessments were conducted of both lower limbs of 51 people free from vascular disease, allocated to three groups of 17 individuals each by predominant working position: sitting, static standing or alternating between the two. Volumes were measured at the start and at the end of the working day and the differences in volumes were calculated for each group. Means and frequencies were compared using appropriate inferential statistics and correlation coefficients were calculated.RESULTS: The groups were homogenous in terms of sex distribution, age, skin color and BMI. The volumetric data from measurements taken before starting work revealed significant differences between all three groups. Volunteers who predominantly worked sitting down had largest volumes, followed by those who remained standing for long periods and then those who varied between these positions. The frequency of lower limb volume increase > 100 mL was significantly higher in the group of people who worked sitting down and maintained this position for long periods.CONCLUSIONS: Postural edema is more common among people who work sitting down for long periods, among whom it appears that there is a cumulative effect from the position, since they exhibit larger lower limb volumes at the start of the day.

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.

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