scholarly journals Correlations Between Stroke Structural Characteristics and Stroke Effect of Young Table Tennis Players

2020 ◽  
Author(s):  
Yi Xiao ◽  
Miaomiao Lu ◽  
Yuxuan Zeng ◽  
Yuanjie Xiao
Keyword(s):  
Angular Velocity ◽  
Knee Joint ◽  
High Speed ◽  
Wrist Joint ◽  
Structural Characteristics ◽  
Table Tennis ◽  
Ball Speed ◽  
Tennis Players ◽  
Spin Speed ◽  
The Right

Abstract Background: A perfect stroke is essential for winning table tennis competition. A perfect stroke is closely related to reasonable stroke structure, which directly affects the stroke effect. The main purpose of this study was to examine the correlations between the structural characteristics of stroke and the stroke effect. Methods: Forty-two young table tennis players were randomly selected from China Table Tennis College (M age = 14.21 ± 2.13; M height = 1.57 ± 0.14 m; M weight = 46.05 ± 6.52 kg, right-hand racket, shake-hands grip, no injuries in each joint of the body). The high-speed infrared motion capture system was used to collect the data of stroke structural characteristics, and the high-speed camera was used to measure the spin speed of the stroke. The influence of striking structural characteristics on striking effect was examined.Results: The time duration of backswing and forward motion were significantly correlated with ball speed (r = -0.403, p < 0.01; r = -0.390, p < 0.01, respectively) and spin speed (r = -0.244, p = 0.027; r = -0.369, p < 0.01, respectively). The linear velocity of right wrist joint was positively correlated with ball speed (r = 0.298, p < 0.01) and spin speed (r = 0.238, p = 0.031). The angular velocity of right elbow joint and right hip joint were positively correlated with ball speed (r = 0.219, p = 0.013; r = 0.427, p < 0.01, respectively) and spin speed (r = 0.172, p = 0.048; r = 0.277, p = 0.012, respectively). The angular velocity of right knee joint had a significantly negative correlation with placement (r = -0.246, p = 0.026). The angular velocity of right ankle joint had a significantly positive correlation with the ball speed (r = 0.443, p < 0.01).Conclusions: The time allocation of the three phases of backspin forehand stroke had an important impact on stroke effect, especially the ball speed and spin speed. The ball speed of the stroke was mainly affected by the translation of the right wrist joint. The spin speed of the stroke was mainly affected by the translation of the right wrist joint. The placement of the stroke was mainly affected by the rotation of the right knee joint.

scholarly journals A Multidisciplinary Investigation of the Effects of Competitive State Anxiety on Serve Kinematics in Table Tennis

2017 ◽  
Vol 55 (1) ◽  
pp. 83-95 ◽  
Author(s):  
Vuong Ngo ◽  
Hugh Richards ◽  
Miran Kondric
Keyword(s):  
Heart Rate ◽  
State Anxiety ◽  
High Speed ◽  
Self Report ◽  
National Standard ◽  
Table Tennis ◽  
High Anxiety ◽  
Tennis Players ◽  
To Receive ◽  
Anxiety Condition

AbstractDisplays of anxiety in table tennis were assessed through subjective (a self-report questionnaire), physiological (heart-rate variability) and kinematic variables. Using a within-group crossover design, 9 university-level table tennis players completed a series of serves under low- and high-anxiety conditions. Anxiety manipulation was achieved through the introduction of a national standard table tennis player, known to the participants, to receive serves in the high-anxiety condition, whilst serves were received by no opponent in the low-anxiety condition. Automated motion capture systems consisting of high-speed 3D motion cameras and analytical software (QUALISYS) determined the subject’s movement kinematics: bat face angle (degrees) and serve routine duration (s). Self-reported state anxiety (MRF-Likert) and heart rate measurements were collected to examine changes between conditions. Contrary to the hypothesis, bat face angles did not change significantly between anxiety conditions (F (1.8) = 2.791, p = 0.133) and movement times were faster in the high-anxiety condition. In light of these findings, research into other facets of movement behaviour must be analysed to gain further understanding of the effects of anxiety on performance, which remain unclear.

scholarly journals Measuring Upper Limb Kinematics of Forehand and Backhand Topspin Drives with IMU Sensors in Wheelchair and Able-Bodied Table Tennis Players

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8303
Author(s):  
Jia-Wen Yam ◽  
Jing-Wen Pan ◽  
Pui-Wah Kong
Keyword(s):  
Upper Limb ◽  
Wrist Joint ◽  
Elbow Flexion ◽  
Measurement Unit ◽  
Shoulder Abduction ◽  
Table Tennis ◽  
Tennis Players ◽  
Movement Strategies ◽  
Flexion Extension ◽  
Limb Kinematics

To better understand the biomechanics of para-table tennis players, this study compared the shoulder, elbow, and wrist joint kinematics among able-bodied (AB) and wheelchair players in different classifications. Nineteen participants (AB, n = 9; classification 1 (C1), n = 3; C2, n = 3; C3, n = 4) executed 10 forehand and backhand topspin drives. Shoulder abduction/adduction, elbow flexion/extension, wrist extension/flexion, respective range of motion (ROM), and joint patterns were obtained using inertial measurement unit (IMU) sensors. The results showed clear differences in upper limb kinematics between the able-bodied and wheelchair players, especially in the elbow and wrist. For the para-players, noticeable variations in techniques were also observed among the different disability classes. In conclusion, wheelchair players likely adopted distinct movement strategies compared to AB to compensate for their physical impairments and functional limitations. Hence, traditional table tennis programs targeting skills and techniques for able-bodied players are unsuitable for para-players. Future work can investigate how best to customize training programs and to optimize movement strategies for para-players with varied types and degrees of impairment.

scholarly journals Quantifying the dynamic wing morphing of hovering hummingbird

2017 ◽  
Vol 4 (9) ◽  
pp. 170307 ◽  
Author(s):  
Masateru Maeda ◽  
Toshiyuki Nakata ◽  
Ikuo Kitamura ◽  
Hiroto Tanaka ◽  
Hao Liu
Keyword(s):  
High Speed ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Angle Of Incidence ◽  
Right Wing ◽  
Wing Model ◽  
Upward Direction ◽  
The Right ◽  
Wing Morphing ◽  
Stroke Cycle

Animal wings are lightweight and flexible; hence, during flapping flight their shapes change. It has been known that such dynamic wing morphing reduces aerodynamic cost in insects, but the consequences in vertebrate flyers, particularly birds, are not well understood. We have developed a method to reconstruct a three-dimensional wing model of a bird from the wing outline and the feather shafts (rachides). The morphological and kinematic parameters can be obtained using the wing model, and the numerical or mechanical simulations may also be carried out. To test the effectiveness of the method, we recorded the hovering flight of a hummingbird ( Amazilia amazilia ) using high-speed cameras and reconstructed the right wing. The wing shape varied substantially within a stroke cycle. Specifically, the maximum and minimum wing areas differed by 18%, presumably due to feather sliding; the wing was bent near the wrist joint, towards the upward direction and opposite to the stroke direction; positive upward camber and the ‘washout’ twist (monotonic decrease in the angle of incidence from the proximal to distal wing) were observed during both half-strokes; the spanwise distribution of the twist was uniform during downstroke, but an abrupt increase near the wrist joint was found during upstroke.

scholarly journals Aspects of the postural alignment and plantar structure in junior female table tennis players

2020 ◽  
Vol 2 ◽  
pp. 2-11
Author(s):  
Daniel Andrei Iordan ◽  
Claudiu Mereuță ◽  
Mircea Dan Mocanu
Keyword(s):  
Female Athletes ◽  
Reference Value ◽  
Table Tennis ◽  
Tennis Players ◽  
Postural Alignment ◽  
Dynamic Level ◽  
Significant Difference ◽  
The Right ◽  
Static Level

The purpose of the present scientific research in performance table tennis at the level of junior female athletes was to determine the postural alignment and structure of the foot sole at static level, in order to create an ameliorationprogram specific to kinetotherapy in the future, in case of identifying deficiencies.Hypothesis: It is assumed that by using modern means of assessing posture and plantar footprints at dynamic level,we can identify the correlations between them in order to facilitate effective compensation systems.The aim of this research is to improve the quality of life and sports performance in junior female table tennisplayers.Methods: The assessment of body posture and plantar footprint was performed by using images, using the freeStepsoftware by Sensor Medica and the assessment of the static plantar pressure and surface was performed by usingthe FreeMedbaropodometric platform. The study was conducted on a group of 9 female table tennis athletes withages between 10 and 12 years old. The deviations from the normal postural and plantar values were calculated withIBM SPSS Statistics software, Version 23.Results and Conclusions: The values (p <0.001 <α = 0.05) for the left sole, respectively (p = 0.001 <α = 0.05) for the right sole, highlight significant differences between the total plantar area and the reference value on both soles of the foot, from the postural assessment resulting a significant difference between the group values and the reference value for all measurements (p <0.001 <α = 0.05).

Studies and simulations on the flight trajectories of spinning table tennis ball via high-speed camera vision tracking system

2018 ◽  
Vol 233 (2) ◽  
pp. 210-226 ◽  
Author(s):  
Ping Wang ◽  
Qian Zhang ◽  
Yinli Jin ◽  
Feng Ru
Keyword(s):  
High Speed ◽  
Tracking System ◽  
Tennis Ball ◽  
Table Tennis ◽  
Flight Trajectory ◽  
Tennis Players ◽  
Simulated Trajectory ◽  
Ideal Tool ◽  
Ball Flight ◽  
Actual Trajectory

When a table tennis ball is hit by a racket, the ball spins and undergoes a complex trajectory in the air. In this article, a model of a spinning ball is proposed for simulating and predicting the ball flight trajectory including the topspin, backspin, rightward spin, leftward spin, and combined spin. The actual trajectory and rotational motion of a flying ball are captured by three high-speed cameras and then reconstructed using a modified vision tracking algorithm. For the purpose of model validation, the simulated trajectory is compared to the reconstructed trajectory, resulting in a deviation of only 2.42%. Such high modeling accuracy makes this proposed method an ideal tool for developing the virtual vision systems emulating the games that can be used to train table tennis players efficiently.

Effects of Dynamic Stretching Combined With Static Stretching, Foam Rolling, or Vibration Rolling as a Warm-Up Exercise on Athletic Performance in Elite Table Tennis Players

2020 ◽  
pp. 1-8
Author(s):  
Fang-Yu Hsu ◽  
Kuei-Lan Tsai ◽  
Chia-Lun Lee ◽  
Wen-Dien Chang ◽  
Nai-Jen Chang
Keyword(s):  
Random Order ◽  
Step Test ◽  
Table Tennis ◽  
Static Stretching ◽  
Ball Speed ◽  
Warm Up ◽  
Tennis Players ◽  
Dynamic Stretching ◽  
Foam Rolling ◽  
Jump Test

Context: Warm-up exercise is an essential preexercise routine for athletes to optimize performance. However, the benefits of combined warm-up protocols remain unclear. Objective: This comparative study investigated the acute effects of dynamic stretching (DS) followed by static stretching (SS), self-myofascial release using a foam rolling (FR) device, or vibration foam rolling (VFR) as a warm-up exercise to improve flexibility, power, agility, and specific skills in elite table tennis players. Design: A crossover study. Setting: University. Participants: Twenty-three elite table tennis players. Interventions: Players completed 3 different interventions in a random order (DS + SS, DS + FR, and DS + VFR). The target muscle groups included the bilateral posterior calf, posterior thigh, anterior thigh, back, and shoulder. Main Outcome Measures: Sit-and-reach test for flexibility, board jump test for lower-extremity power, medicine ball throw test for upper-extremity power, Edgren Side Step Test for agility, and ball speed of table tennis was assessed before and after intervention. Results: After intervention, significant increases in flexibility (15.2%, 20.4%, and 23.8%); lower-limb power (4.5%, 6.6%, and 6.3%); upper-limb power (9.6%, 8.5%, and 9.1%); and ball speed (7.4%, 7.6%, and 7.7%) were observed for DS + SS, DS + FR, and DS + VFR, respectively (all P < .001). In addition, only DS coupled with FR (5.1%) and DS in conjunction with VFR (2.7%) significantly improved agility (P < .001). However, no significant improvements in agility were observed after DS + SS. In addition, no one protocol was superior to the other in all outcomes. Conclusion: The authors suggest that a combination of DS with FR or VFR as warm-up exercises significantly improved flexibility, power, ball speed, in addition to agility in elite table tennis players. Coach and athletic professionals may take this information into account for choosing more effective warm-up protocols to enhance performance.

scholarly journals Extraction of Knowledge from the Topographic Attentive Mapping Network and its Application in Skill Analysis of Table Tennis

2017 ◽  
Vol 55 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Isao Hayashi ◽  
Masanori Fujii ◽  
Toshiyuki Maeda ◽  
Jasmin Leveille ◽  
Tokio Tasaka
Keyword(s):  
Middle Level ◽  
Sensor Data ◽  
Table Tennis ◽  
Biologically Inspired ◽  
Tennis Players ◽  
Intermediate Layers ◽  
Skill Analysis ◽  
The Difference ◽  
Technique Evaluation ◽  
The Right

AbstractThe Topographic Attentive Mapping (TAM) network is a biologically-inspired classifier that bears similarities to the human visual system. In case of wrong classification during training, an attentional top-down signal modulates synaptic weights in intermediate layers to reduce the difference between the desired output and the classifier’s output. When used in a TAM network, the proposed pruning algorithm improves classification accuracy and allows extracting knowledge as represented by the network structure. In this paper, sport technique evaluation of motion analysis modelled by the TAM network was discussed. The trajectory pattern of forehand strokes of table tennis players was analyzed with nine sensor markers attached to the right upper arm of players. With the TAM network, input attributes and technique rules were extracted in order to classify the skill level of players of table tennis from the sensor data. In addition, differences between the elite player, middle level player and beginner were clarified; furthermore, we discussed how to improve skills specific to table tennis from the view of data analysis.

scholarly journals Physiological Profile, Metabolic Response, and Temporal Structure in Elite Individual Table Tennis: Differences According to Gender

2021 ◽  
Vol 18 (22) ◽  
pp. 11898
Author(s):  
Francisco Pradas ◽  
Ana de la de la Torre ◽  
Carlos Castellar ◽  
Víctor Toro-Román
Keyword(s):  
Gender Differences ◽  
Metabolic Response ◽  
Structural Characteristics ◽  
Temporal Structure ◽  
Table Tennis ◽  
Physiological Profile ◽  
Tennis Players ◽  
Energy Demands ◽  
Temporal Variables ◽  
Playing Time

No research that has analyzed the structural characteristics, physiological profile, and energy demands in the game of table tennis as played by women is available. The present study aimed to evaluate the physiological, metabolic, and temporal variables of table tennis players and to observe gender differences. Forty-eight elite table tennis players participated in this study: 24 men (25.3 ± 4.07 years) and 24 women (22.3 ± 3.8 years). During simulated competition, temporal structure, heart rate (HR), and lactate (LA) were evaluated. The maximum ergospirometric evaluations were performed in a laboratory. The total table tennis (TT) time and the total resting time (TRT) were longer for men (p < 0.05), but game density was higher for women (p < 0.05). During rallies, the real playing time (RPT) was longer for women, while the TRT was longer for men (p < 0.05). The maximum HR, minimum HR, and maximum LA concentrations were higher for men (p < 0.05). The obtained data reveal gender differences in the physiological, metabolic, structural, and temporal variables in table tennis players. The analysis of the studied variables could allow training sessions to be planned and organized according to table tennis players’ gender.

scholarly journals The effect of fatigue on kinematics and kinetics of basketball dribbling with changes of direction

Kinesiology ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 296-308
Author(s):  
Feng Li ◽  
Tomislav Rupčić ◽  
Damir Knjaz
Keyword(s):  
Angular Velocity ◽  
Knee Joint ◽  
Wrist Joint ◽  
Body Height ◽  
Maximum Force ◽  
Basketball Players ◽  
Basketball Game ◽  
Step Velocity ◽  
Significant Difference ◽  
Kinematics And Kinetics

Basketball dribbling is one of the key elements in basketball game. There is a lack of studies investigating the effect of fatigue on kinematics and kinetics in basketball dribbling. There are two primary aims of this study: (1) to explore the effect of fatigue on kinematics and kinetics in dribbling with the change of directions; (2) to determine the effect of fatigue on dribbling speed. Fourteen Croatian senior male basketball players, not power forwards or centers (age: 21.16±3.43 years; body height: 188.81±6.88 cm; body mass: 87.81±6.06 kg; body fat: 13.34±3.52%) participated in the study. Each player performed two types of change of direction (COD) while dribbling: front COD and spin move in the non-fatigued and then in the fatigued state. Xsens suit and Novel insoles were used to measure the kinematic and kinetic parameters. In terms of the front COD, the results of this study demonstrated that the maximum angular velocity in the knee (p=.028) and wrist joint (p=.007) as well as maximum force (p=.004) significantly decreased in the fatigued state. In terms of the spin move, the results showed that there were significant differences in pelvis velocity (p=.000), the maximum angular velocity in the knee joint (p=.020), and the first step velocity (p=0.010) between the fatigued and non-fatigued states. No significant difference was found in the pelvis position, minimum angle in the knee joint and maximum force. Importantly, dribbling speed significantly decreased in the fatigued state (p=.002). The findings of this study suggest that coaching staff should design appropriate training programs to optimize players’ ability to resist fatigue when dribbling under real game speed conditions.

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