scholarly journals The Effects of Knee Flexion on Tennis Serve Performance of Intermediate Level Tennis Players

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5254
Author(s):  
Joana Ferreira Hornestam ◽  
Thales Rezende Souza ◽  
Fabrício Anício Magalhães ◽  
Mickäel Begon ◽  
Thiago Ribeiro Teles Santos ◽  
...  
Keyword(s):  
Knee Flexion ◽  
Inertial Sensors ◽  
Knee Extension ◽  
Mean Difference ◽  
Intermediate Level ◽  
Ball Impact ◽  
Tennis Players ◽  
Junior Tennis ◽  
Preparation Phase ◽  
Tennis Serve

This study aimed to investigate the effects of knee flexion during the preparation phase of a serve on the tennis serve performance, using inertial sensors. Thirty-two junior tennis players were divided into two groups based on their maximum knee flexion during the preparation phase of serve: Smaller (SKF) and Greater (GKF) Knee Flexion. Their racket velocity, racket height, and knee extension velocity were compared during the tennis serve. Inertial sensors tracked participants’ shank, thigh, and racket motions while performing five first, flat, and valid serves. Knee flexion was analysed during the preparation phase of serve, knee extension velocity after this phase, racket velocity just before ball impact, and racket height at impact. Pre-impact racket velocity (mean difference [MD] = 3.33 km/h, p = 0.004) and the knee extension velocity (MD = 130.30 °/s, p = 0.012) were higher in the GKF than SKF; however, racket impact height was not different between groups (p = 0.236). This study’s findings support the importance of larger knee flexion during the preparation phase of serve-to-serve performance. This motion should be seen as a contributor to racket velocity.

scholarly journals Kinematic characteristics of the tennis serve from the ad and deuce court service positions in elite junior players

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0252650
Author(s):  
Janina Fett ◽  
Nils Oberschelp ◽  
Jo-Lâm Vuong ◽  
Thimo Wiewelhove ◽  
Alexander Ferrauti
Keyword(s):  
Skill Acquisition ◽  
Performance Enhancement ◽  
Ball Impact ◽  
Tennis Players ◽  
Starting Position ◽  
Target Field ◽  
Junior Tennis ◽  
Tennis Serve ◽  
Multiple Characteristics ◽  
And Performance

Purpose According to the official rules of the International Tennis Federation, players have to serve alternately from two different positions: the deuce (right, D) and the ad court (left, AD) side. This study aimed to compare body and ball kinematics of flat serves from both service sides. Methods In a controlled, semi-court laboratory setting, 14 elite male junior players served eight flat first serves to a target field directed to the receiver’s body from both service positions in a matched and counterbalanced order. An 8-camera-Vicon-System was used to capture the 3D-landmark trajectories. Results The mean service velocity was found to be similar on both sides (D: 151.4 ± 19.8 vs. AD: 150.5 ± 19.4 km/h), while multiple characteristics of the serve and ball kinematics differed significantly (p < .05). At starting, the front-foot angle relative to the baseline (D: 39.7±17.6° vs. AD: 31.1±17.4°) and lateral distance between the feet (D: 16.3 ± 12.9 cm vs. AD: 26.2 ± 11.9 cm) were significantly different. During the service, upper torso range of motion from maximum clockwise rotation until impact was significantly greater on the deuce court (D: 130.5 ± 19.8° vs. AD: 126.7 ± 21.1°). This was especially pronounced in foot-back technique players. Further, differences in the lateral ball impact location (D: 30.0 ± 24.1 cm vs. AD: 10.3 ± 23.3 cm) were observed. Conclusions Changing the service side affects the serve and ball kinematics in elite junior tennis players. Our results underline biomechanical differences regarding the starting position (feet and upper torso) as well as the movement and ball kinematics which could be relevant for skill acquisition, injury prevention and performance enhancement.

scholarly journals A descriptive profile of age-specific knee extension flexion strength in elite junior tennis players

2007 ◽  
Vol 41 (11) ◽  
pp. 728-732 ◽  
Author(s):  
T. S Ellenbecker ◽  
E P. Roetert ◽  
T. Sueyoshi ◽  
S. Riewald
Keyword(s):  
Knee Extension ◽  
Tennis Players ◽  
Junior Tennis ◽  
Flexion Strength

scholarly journals Using Smart Sensors to Monitor Physical Activity and Technical–Tactical Actions in Junior Tennis Players

2020 ◽  
Vol 17 (3) ◽  
pp. 1068 ◽  
Author(s):  
José María Giménez-Egido ◽  
Enrique Ortega ◽  
Isidro Verdu-Conesa ◽  
Antonio Cejudo ◽  
Gema Torres-Luque
Keyword(s):  
Physical Activity ◽  
Current System ◽  
World Health ◽  
Smart Devices ◽  
Time Data ◽  
Ball Impact ◽  
Tennis Players ◽  
Junior Tennis ◽  
Green Stage ◽  
A Current

The use of smart devices to obtain real-time data has notably increased in the context of training. These technological tools provide data which monitor the external load and technical–tactical actions related to psychological and physical health in junior tennis players. The purpose of this paper is to monitor technical–tactical actions and physical activity during a current tennis competition in the Green stage using a Zepp Tennis Smart Sensor 2. The participants were 20 junior tennis players (under 10 years of age), with an average age of 9.46 years. The total number of strokes (n= 21,477) during 75 matches was analyzed. The study variables were the following aspects: (a) number of strokes, (b) ball impact in the sweet spot; (c) racket speed; (d) ball spin; (e) calories burned; and (f) match time. The current system of competition, based on knockout, does not meet the World Health Organization’s recommendations for daily physical activity time. Players mainly used flat forehands with a lack of variability in technical–tactical actions which did not meet the current learning opportunity criteria of comprehensive methodologies. The competition system in under-11 tennis should be adapted to the players’ characteristics by improving the variability and quantity of practice.

Effects of Two Different Resistance-Training Programs on Mean Tennis-Serve Velocity in Adolescents

2013 ◽  
Vol 25 (3) ◽  
pp. 370-384 ◽  
Author(s):  
Michael Behringer ◽  
Sebastian Neuerburg ◽  
Maria Matthews ◽  
Joachim Mester
Keyword(s):  
Resistance Training ◽  
Training Programs ◽  
Maximum Velocity ◽  
Training Group ◽  
Control Group ◽  
Plyometric Training ◽  
Male Athletes ◽  
Tennis Players ◽  
Junior Tennis ◽  
Tennis Serve

The purpose of the current study was to evaluate the transferability of 2 different resistance training protocols on service velocity and its precision consistency in junior tennis players. Thirty-six male athletes (15.03 ± 1.64 years) were randomly assigned to a machine-based resistance-training group (RG, n = 12), a plyometric training group (PG, n = 12), and a control group (CG, n = 12). For a period of 8 weeks, both intervention groups resistance trained 2 days per week in addition to their regular tennis training, whereas the CG had no extra training. Mean service velocity over 20 maximum-velocity serves increased significantly more in PG (3.78%; p < .05) when compared with CG, whereas no such changes could be found in the RG (1.18%; p > .05). Service precision did not change from pre- to posttest in all three groups (p > .05). Only the plyometric training program tested, improved mean service velocity over 20 maximum-velocity serves in junior tennis players but did not affect service precision.

Forces on the Hand in the Tennis One-Handed Backhand

1991 ◽  
Vol 7 (3) ◽  
pp. 282-292 ◽  
Author(s):  
Duane V. Knudson
Keyword(s):  
Tennis Elbow ◽  
Thenar Eminence ◽  
Skill Level ◽  
Intermediate Level ◽  
Large Impact ◽  
Ball Impact ◽  
Tennis Players ◽  
Peak Loads ◽  
Load Cells ◽  
Impact Acceleration

This study examined the pattern of forces and peak loads on the hands of six advanced and six intermediate level male tennis players as they performed one-handed backhand drives. Two miniature load cells were mounted on a midsized graphite racket. The force on the thenar and hypothenar eminences of the hand were sampled at 1000 Hz. Forces on the thenar eminence in preparation for impact were significantly larger and less variable for the advanced subjects. Postimpact peak forces did not differ across skill level and were smaller than the loads reported for forehand drives. The significantly lower thenar forces the intermediate subjects used in preparation for impact may provide less resistance to the acceleration of the racket created by ball impact. A large impact acceleration may be related to a rapid stretch of the wrist extensors, which has been hypothesized to be the cause of tennis elbow.

scholarly journals PETTLEP imagery and tennis service performance: an applied investigation

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Nafih Cherappurath ◽  
Masilamani Elayaraja ◽  
Dilshith A. Kabeer ◽  
Amila Anjum ◽  
Paris Vogazianos ◽  
...  
Keyword(s):  
Age Groups ◽  
Training Session ◽  
Performance Outcomes ◽  
Service Performance ◽  
Control Group ◽  
Specific Training ◽  
Tennis Players ◽  
Imagery Training ◽  
Before And After ◽  
Junior Tennis

AbstractTennis is one of the most popular and widely played sports enjoyed by players of different age groups and genders as a profession as well as a mode of recreation. A novel method, PETTLEP imagery combines both conventional and non-conventional style of training of an athlete and improves one’s performance. This study aimed to analyze the tennis service performance of junior tennis players based on PETTLEP imagery training. Forty-four junior male tennis players (Mage=13.22 years, SD=0.42) were selected for the study. The investigator handed over the MIQ-R questionnaire to all the participants in which they scored 16 and above points as per previous research. The participants were equally divided (n=11) into three experimental groups (E1, E2, and E3) and a control group. The service performance outcomes of all the players were compared before and after a training session. The three experimental groups were assigned with service-specific training, service-specific training combined with PETTLEP imagery training, and PETTLEP imagery training alone, respectively, for three days per week for 12 weeks. They were tested on their service accuracy based on the International tennis number (ITN) manual on-court assessment test. The data were assessed for normality and analyzed using non-parametric methods to reveal main effects (each training method alone) as well as to calculate the combined effect of PETTLEP and service-specific training. Certain significant improvements in tennis service were observed with service-specific training alone. Though it marginally outperformed the PETTLEP imagery method, the most improved services were observed with both PETTLEP and service-specific training utilized together. This implies an additive effect when both methods are used together.

scholarly journals Effect of Long-Term Unilateral Activity on Bone Mineral Density of Female Junior Tennis Players

1998 ◽  
Vol 13 (2) ◽  
pp. 310-319 ◽  
Author(s):  
Heidi Haapasalo ◽  
Pekka Kannus ◽  
Harri Sievänen ◽  
Matti Pasanen ◽  
Kirsti Uusi-Rasi ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Mineral Density ◽  
Tennis Players ◽  
Junior Tennis

Acute Sleep Restriction Affects Sport-Specific But Not Athletic Performance in Junior Tennis Players

2020 ◽  
pp. 1-6
Author(s):  
Jacopo A. Vitale ◽  
Matteo Bonato ◽  
Lorenzo Petrucci ◽  
Giorgio Zucca ◽  
Antonio La Torre ◽  
...  
Keyword(s):  
Athletic Performance ◽  
Test Session ◽  
Sleep Restriction ◽  
Test Procedures ◽  
Ability Test ◽  
Tennis Players ◽  
Individual Level ◽  
Testing Procedures ◽  
Junior Tennis ◽  
Left And Right

Purpose: Little is known about the effect of sleep restriction (SR) on different domains of athletes’ physical performance. Therefore, the aim of this randomized, counterbalanced, and crossover study was to evaluate the effect of acute SR on sport-specific technical and athletic performance in male junior tennis players. Methods: Tennis players (N = 12; age 15.4 ± 2.6 y) were randomly allocated to either a sleep-restriction condition (SR, n = 6), where they experienced acute sleep restriction the night before the test session (≤5 h of sleep), or to a control condition (CON, n = 6), where they followed their habitual sleep–wake routines. Testing procedures included 20 left and right serves, 15 forehand and backhand crosscourt shots, and a repeated-sprint-ability test (RSA). The accuracy of serves and shots was considered for further analysis. One week later, players of SR joined CON, and players of CON experienced SR, and all test procedures were repeated. Results: Significant decrease in the accuracy of right (−17.5%, P = .010, effect size [ES] = 1.0, moderate) and left serve (−14.1%, P = .014, ES = 1.2, large), crosscourt backhand (−23.9%, P = .003, ES ≥ 2.0, very large), and forehand shot (−15.6%, P = .014, ES = 1.1, moderate) were observed in SR compared to CON, while RSA was similar in both conditions. Conclusion: Coaches and athletes at the team and individual level should be aware that 1 night of SR affects sport-specific but not athletic performance in tennis players.

The Relationship between Observable Self-Talk and Competitive Junior Tennis Players' Match Performances

1994 ◽  
Vol 16 (4) ◽  
pp. 400-415 ◽  
Author(s):  
Judy L. Van Raalte ◽  
Britten W. Brewer ◽  
Patricia M. Rivera ◽  
Albert J. Petitpas
Keyword(s):  
Sport Psychology ◽  
Descriptive Analysis ◽  
Sport Performance ◽  
Cognitive Factors ◽  
Competitive Sport ◽  
Tennis Players ◽  
Self Talk ◽  
Junior Tennis ◽  
The Relationship ◽  
Broad Interest

In sport psychology, there is broad interest in cognitive factors that affect sport performance. The purpose of this research was to examine one such factor, self-talk, in competitive sport performance. Twenty-four junior tennis players were observed during tournament matches. Their observable self-talk, gestures, and match scores were recorded. Players also described their positive, negative, and other thoughts on a postmatch questionnaire. A descriptive analysis of the self-talk and gestures that occurred during competition was generated. It was found that negative self-talk was associated with losing and that players who reported believing in the utility of self-talk won more points than players who did not. These results suggest that self-talk influences competitive sport outcomes. The importance of "believing" in self-talk and the potential motivational and detrimental effects of negative self-talk on performance are discussed.

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