Mixture particle filter with block jump biomechanics constraint for volleyball players lower body parts tracking

2017 ◽  
Author(s):  
Fanglu Xie ◽  
Xina Cheng ◽  
Takeshi Ikenaga
Keyword(s):  
Particle Filter ◽  
Body Parts ◽  
Lower Body ◽  
Volleyball Players

scholarly journals Methodology of teaching the techniques of playing volleyball among 11-12 year-old boys

2020 ◽  
Vol 26 ◽  
pp. 00083
Author(s):  
Irina Lazunina ◽  
Maria Kosheleva
Keyword(s):  
Direct Observation ◽  
Peripheral Vision ◽  
Body Parts ◽  
Main Attention ◽  
Direct Training ◽  
Volleyball Players ◽  
The Moment ◽  
Definite Limit

In all games, connected with the ball, main attention of a player should be paid to a moving ball. This rule ignoring leads to often inaccurate ball hitting. Admittedly, players should be taught to observe the opponent. But at the same time direct observation is held to the definite limit. And during the moment of direct training and hit fulfillment main attention is paid to the ball and other environment is observed only with the help of peripheral vision. During the game young volleyball players lose many favorable moments only because they can’t choose the best ways of a hit in the combat with the opponent. During the playing technique explanation and study it is necessary to study thoroughly the basis of the technique, the sequence of the separate body parts movements, speed and their amplitude during different techniques fulfillment. These factors are the main for volleyball player’s actions effectiveness achievement. While the attacking hit fulfillment and blocking it is important to control the opponent during the technique fulfillment. That is why it is necessary to master the ability to observe the opponent’s movements all the time, till the hit on the ball, among young volleyball players.

scholarly journals Associations between Absolute and Relative Lower Body Strength to Measures of Power and Change of Direction Speed in Division II Female Volleyball Players

Sports ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 160 ◽  
Author(s):  
Whitney Tramel ◽  
Robert G. Lockie ◽  
Keston G. Lindsay ◽  
J. Jay Dawes
Keyword(s):  
Vertical Jump ◽  
Relative Strength ◽  
T Test ◽  
Lower Body ◽  
Strength And Conditioning ◽  
Change Of Direction ◽  
Jump Test ◽  
Body Strength ◽  
Volleyball Players ◽  
Lower Body Strength

Volleyball is a sport comprised of multiple explosive efforts and multidirectional change of direction speed (CODS) actions. Since strength underpins both of these abilities, it is important to explore the relationship between these variables in order to develop strength and conditioning programs to optimize performance. The purpose of this study is to determine if a relationship exists between absolute and relative strength and measures of power and CODS in collegiate volleyball players. Archived testing data from ten (n = 10, age: 19.1 ± 1.2 yrs, Ht: 173.1 ± 6.64 cm, Wt: 67 ± 7.04 kg) female DII collegiate volleyball players were analyzed. These data included: block vertical jump (Block VJ), approach vertical jump (Approach VJ), a repeat jump test (i.e., four consecutive VJs), modified T-test, 5-0-5 agility test, a single leg triple hop test, and a 1-3RM deadlift. Significant large correlations were observed between relative strength and the repeat jump test, modified T-test, and 5-0-5 agility test. Significant correlations were also observed between absolute strength and the modified T-test. These results indicate that strength and conditioning professionals should emphasize the development of both absolute and relative lower-body strength to improve measures of power and agility in collegiate volleyball players.

Throwing Skills

2017 ◽  
Vol 124 (2) ◽  
pp. 502-513 ◽  
Author(s):  
Saeed Ghorbani ◽  
Andreas Bund
Keyword(s):  
Motor Learning ◽  
Motor Skills ◽  
Learning Task ◽  
The Other ◽  
Acquisition Phase ◽  
Body Parts ◽  
Lower Body ◽  
Body Segments ◽  
Dependent Variables ◽  
Exploratory Data

Traditionally, motor learning scientists have evaluated the process of learning a new motor skill by considering the skill as a whole. Yet, motor skills comprise various phases, and in the motor learning literature, it is not clear whether new learners show similar or different learning across various phases. We provide exploratory data on learning movement phases by novices, using baseball pitching as the learning task. Eight participants (four male, four female, M age = 23.7 years, SD = 2.4) performed five trials each in the pretest followed by three blocks of 10 trials each in the acquisition phase. Finally, two retention tests of five trials were conducted by each participant 10 minutes and seven days after the last acquisition block, respectively. Intra- and interlimb coordination of upper and lower body segments were measured as dependent variables. We found significant differences between the stride phase and the other phases at pretest, during the acquisition phase, and on both retention tests across all kinematic variables. Participants experienced more trouble coordinating the stride phase than the other phases of pitching, perhaps because the stride phase is the only phase in which the participants had to move their upper and lower body parts simultaneously. We discuss implications for motor learning generally.

scholarly journals The Effects of Plyometric Conditioning Exercises on Volleyball Performance with Self-Selected Rest Intervals

2021 ◽  
Vol 11 (18) ◽  
pp. 8329
Author(s):  
Michal Krzysztofik ◽  
Rafal Kalinowski ◽  
Aleksandra Filip-Stachnik ◽  
Michal Wilk ◽  
Adam Zajac
Keyword(s):  
Performance Enhancement ◽  
Lower Body ◽  
Mean Power ◽  
Back Squat ◽  
Specific Performance ◽  
Volleyball Players ◽  
Before And After ◽  
Ball Velocity ◽  
Mean Power Output ◽  
Rest Intervals

Post-activation performance enhancement remains a topic of debate in sport science. The purpose of this study was to examine the effects of lower-body plyometric conditioning activity (CA) with a self-selected intra-complex rest interval on upper and lower-body volleyball specific performance. Eleven resistance-trained female volleyball players participated in the study (age: 20 ± 2 years; body mass: 67.8 ± 4.4 kg; height: 178 ± 6 cm; half back squat one-repetition maximum: 78.6 ± 10.2 kg; experience in resistance training: 5.5 ± 2.1 years and in volleyball training: 10 ± 2.3 years). Each participant performed a plyometric CA followed by two different sport-specific tests: an attack jump and a standing spike attack. The changes in jump height (JH), relative mean power output (MP) and ball velocity (BV) were analyzed before and after the CA with self-selected rest intervals. The applied plyometric CA with self-selected intra-complex rest intervals led to an insignificant decline in JH (p = 0.594; effect size [ES]: −0.27) and MP (p = 0.328; ES: −0.46) obtained during the attack jump as well as a significant decline in BV (p = 0.029; ES: −0.72) during the standing spike attack. This study showed that a plyometric CA with self-selected intra-complex rest intervals failed to elicit localized and non-localized PAPE effect in a group of sub-elite volleyball players.

Study on Calculating Methods of Young Women Body Circumferences Based on 3D Point-Cloud Data

2011 ◽  
Vol 332-334 ◽  
pp. 2010-2013
Author(s):  
Pin Ying Gu ◽  
Ting Chen ◽  
Lei Huang ◽  
Hai Yan Kong ◽  
Guo Lian Liu
Keyword(s):  
Point Cloud ◽  
Point Clouds ◽  
Female Students ◽  
Body Parts ◽  
Point Cloud Data ◽  
Lower Body ◽  
Cloud Data ◽  
Data Acquisition Software ◽  
Body Circumferences ◽  
Body Scanner

In this research, 425 female students were selected as the research objects. Point clouds were obtained by 3D body scanner , then the characteristics of female lower body parts’ (waist, abdomen, buttock) section shapes were identified .And the sizes of the width and thickness were measured by a data acquisition software named Imageware.The front and back circumferences were analysed by software of SPSS16.0.This research is main to provide a new method to divide and calculate body front and back circumferences, laying the foundation for fitting of women clothes.

Investigation and comparison on thermal comfort and energy consumption of four personalized seat heating systems based on heated floor panels

2020 ◽  
pp. 1420326X2093914
Author(s):  
Guoqing Yu ◽  
Zhaoji Gu ◽  
Zhenye Yan ◽  
Hengtao Chen
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Yangtze River Basin ◽  
High Energy ◽  
Body Parts ◽  
Lower Body ◽  
Heating Systems ◽  
Heated Floor

The climate of Yangtze River Basin in China is cold and humid in winter. Conventional air-conditioning systems may cause high energy consumption and uncomfortable microclimatic conditions especially for lower body of indoor occupants. This study investigated four personalized seat heating systems, in a typical office room in Shanghai during winter, based on heated floor panels including heated floor panels + ordinary chair (HF-OC), heated floor panels + insulated chair (HF-IC), heated floor panels +insulated chair and leg box (HF-IC-LB) and overall personalized heating (OPH). The surface temperature of walls and heated floor panels, and the indoor air temperature at different positions were recorded with thermocouples. The hourly energy consumptions of the proposed personalized seat heating systems were measured and compared with a conventional split type air conditioner. Questionnaires of thermal sensation and comfort were carried out among 10 university students. Compared with HF-OC, HF-IC could improve the thermal comfort to a certain extent, while HF-IC-LB provided the optimal thermal micro-environment for the lower body other than other body parts. The OPH systems were proven effective to provide satisfactory thermal environment for all body parts at lower indoor temperature (12–16°C) with much less energy consumption than room air conditioners.

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