Wyniki wyszukiwania - Biblioteka Nauki

1

An Assessment on the Aerobic and Anaerobic Capacities of a Tennis Player

100%

Zatoń M. , Stępień A.

Human Movement

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2011

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tom 12

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nr 2

139-146

EN

Purpose. The purpose of this research was to determine the relationship between a tennis players' technical abilities and their capacity evaluated in both a laboratory and on the tennis court. Basic procedures. Twelve tennis players participated in the study. The anaerobic capacity test (Wingate) and the progressive test were performed on a Monark E 895 cycloergometer. The aerobic and anaerobic capacities were evaluated in the laboratory. The Weber capacity test was performed on a tennis court. Main findings. The research did not reveal any significant correlation between the Wingate's mechanical parameters and the physiological parameters of the Weber test. A correlation of the maximal oxygen uptake with stroke precision on a tennis court can be observed. The research found that the maximal power output (Pmax) and total work (Wtot) found in the laboratory is related to the stroke precision on a tennis court. Conclusions. The results may suggest that both tests can be applied in the assessment of capacity and the effects of training. From the results of the laboratory and on-court tests, it is possible to specify a player's semi-specific endurance.

2

The Kinematics of Trunk and Upper Extremities in One-Handed and Two-Handed Backhand Stroke

100%

Stępień A. , Bober T. , Zawadzki J.

Journal of Human Kinetics

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2011

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tom 30

37-47

EN

The aim of this study was to present kinematics of trunk and upper extremities in tennis players who perform one-handed and two-handed backhand strokes. The study aimed to address the question of whether one of those techniques has some important advantage over the other. If so, what makes it superior?The study included 10 tennis coaches with average coaching experience of 9 years. The coaches were asked to hit 15 one-handed and two-handed backhands. The tests were carried out in a laboratory. A sponge ball was used in order to protect the measurement equipment. Video motion analysis was carried out using BTS SMART system; images were recorded with 6 cameras with a rate of 120 frames per second. The analysis of both backhand strokes focused on the second phase of the stroke (acceleration).The use of an eight-element model of human body for description of upper body motion in both techniques revealed kinematic differences in how both backhands are performed. The two-handed backhand was performed in closed kinetic chain with 8 degrees of freedom, whereas the one-handed backhand involved an open kinetic chain with 7 degrees of freedom. Higher rigidity of upper extremities which are connected with trunk in the two-handed backhand, contributes to an elevated trunk effect in this stroke. This is confirmed by higher component velocities for racket handle, which result from trunk rotation in the two-handed backhand and a negative separation angle in the two-handed backhand at the moment of contact of the racket with the ball.The study does not provide a clear-cut answer to the question of advantages of one technique over the other; however, it reveals dissimilar patterns of driving the racket in both techniques, which suggests the need for extending the analysis of techniques of both backhands with additional kinematics of tennis racket in consideration of measurements of ball velocities.

3

The application of information technology in collecting data on tennis performance

100%

Nowak M. , Gąsiorek E. , Radomański J.

Informatyka Ekonomiczna

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2015

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nr 1(35)

36-52

EN

This study focused on the application and accuracy of spatially marking tennis shots in a special computer interface based on the visual observation of video recorded tennis play. The interface program, graphically designed in the shape of a tennis court, is shown on a computer screen along with a video showing a series of balls being hit and landing on the court. The task of the observer was to mark on the interface the location where he/she felt the ball falls on the court. In effect, the interface functions as a coordinate system whereby tennis play (in this case balls falling on one side of the court) is catalogued into a series of coordinative points. These data are then converted into a spreadsheet allowing for statistical calculation and analysis. The results of the trial indicated that the accuracy of the designated points on the interface depended on the distance between where the ball fell and the nearest line delineating the court. Balls that landed less than 0.3 m from the nearest line featured a mean distance error of only 0.11 m. For the purpose of analysing game tactics, the interface was found to be an applicable tool in the collection of tennis match data.

4

The Effects of Rhythm Training on Tennis Performance

100%

Söğüt M. , Kirazci S. , Korkusuz F.

Journal of Human Kinetics

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2012

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tom 33

123-132

EN

Rhythm training is an integral part of sports. The purposes of the study were to analyze the effects of rhythm training on tennis performance and rhytmic competence of tennis players, to compare the improvement levels of tennis specific and general rhythm training and to examine the effects of shorter and longer tempos on rhythmic competence. Thirty university students whose mean score of International Tennis Number (ITN) was 7.3 (±0.9) were divided randomly into three sub-groups: Tennis Group, General Rhythm Training Group and Tennis-Specific Rhythm Training Group. The experimental procedure lasted 8 weeks. During this period, all groups had the same tennis training twice a week. The Tennis Group had regular tennis training sessions. In addition to regular tennis training sessions, the General Rhythm Training Group followed the general rhythm training sessions and the Tennis-Specific Rhythm Training Group had tennis-specific rhythm training. The measurement instruments were ITN, Rhythmic Competence Analysis Test and Untimed Consecutive Rally Test. The results indicated that participation in tennis-specific or general rhythm training resulted in progress in tennis playing levels, forehand consistency performance and rhythmic competence of the participants. On the other hand, attendance to the regular 8-week tennis training was enough to solely increase the tennis playing level but not sufficient to develop forehand consistency performance and rhythmic competence. Although the participants in the TRTG had better improvement scores than the ones in the GRTG, no significant difference was found between the rhythm training groups. The results also revealed that participants exhibited higher rhythmic competence scores on fast tempo compared to slow tempo.

5

Online coach development and certification programs in sports: are they possible?

88%

Papageorgiou K. G.

Central European Journal of Sport Sciences and Medicine

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2020

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tom 32

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nr 4

69-75

EN

Anticipating the inevitable shift of coach education and Coach Certification Programs (CCP) to distance-learning platforms in the imminent future, I have attempted to identify obstacles that we are likely to face. After explaining the rationale and the potential benefits of such courses, I have identified technique as the most difficult component to both teach and evaluate. A specific viewpoint regarding technique is briefly discussed and several related guidelines are provided to assist in both teaching (coach education) and evaluating technique (CCP) within the context of distance education.

6

A Unique Case of Supraspinatus Tendonitis after Tennis Forehand Repetitive Motions

88%

Djurovic N. , Hraste M. , Stanisic L. , Lozovina M. , Lozovina V. , Pavicic L.

Journal of Human Kinetics

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2010

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tom 23

115-119

EN

A unique case of a professional tennis player who sustained a traumatic supraspinatus tendonitis while playing Forehand was presented. This case shows how science fields could and should cooperate in the future since this appears to be the first report of high inflammatory of supraspinatus tendon during Forehand motions. Instead of aggressive treatment in the form of surgery, a team of experts decided for new treatment that brought exceptional results.

7

Physical Performance, Body Composition and Body Balance in Relation to National Ranking Positions in Young Polish Tennis Players

88%

Karnia M. , Garsztka T. , Rynkiewicz M. , Rynkiewicz T. , Zurek P. , Łuszczyk M. , Śledziewska E. , Ziemann E.

Baltic Journal of Health and Physical Activity

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2010

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tom 2

|

nr 2

113-123

EN

Background: Tennis is characterized with short and intermittent efforts of an altering intensity and time where numerous factors determine the achieved success. Some of them include human's morphological body build, motor abilities and efficiency of the energetic systems. Both motor abilities and physical capacity appear to be particularly significant due to the unpredictable time and weather situation of the tournaments. The purpose of this study was to determine the relationship between body composition, aerobic capacity and the balance in young tennis players at rest and during fatigue triggered by an endurance test. Moreover, we tried to find the correlation between the tennis ranking position and the balance.Material/Methods: Well-trained 16 young tennis players (15 and 17 years old, singles national ranking 3-39, average training experience of 9 years) took part in this study. They were assigned to two groups according to their age - 15 TG and 17 TG. Participants completed the same battery of body composition, aerobic, and body balance assessments. Body balance measurement was repeated twice - before and after the aerobic assessment.Results: The main finding of this study points out the body balance to be a motor ability influencing results achieved in the specific tennis drill. This connection was observed in both of the tested groups; however, it was particularly significant within 17 TG.Conclusions: The presented study does not point out the main factor to focus on when conducting a career of a professional tennis player regardless of the numerous tests and measurements included in the analysis observed. Interesting correlations may suggest that for the players in a developmental age it is speed and balance that ought to be more intensively developed.

8

Measurement of Angular Parameters and Velocities of the Upper Limb Segments in Tennis Using Inertial Motion Sensors for the Purposes of the Didactic Process

88%

WOŁOSZYN F.

Edukacja-Technika-Informatyka

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2019

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tom 10

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nr 1

302-309

EN

The aim of the study is to show differences in accurate and missed forehand and backhand strokes in tennis, as a feedback for coaches, teachers and players. The main assumptions of the study are to show the values of angular parameters and velocity, as well as to analyse every phase of a stroke. The priority in the study is to show how the abovementioned parameters affect the accuracy and velocity of forehand and backhand strokes. Material and research methods: A professional tennis player was tested using the individual case method and kinematic analysis. The motion capture system (MCS) was used for research purposes using inertial motion sensors. Results: Strokes were analysed to demonstrate the angular parameters and velocities of selected upper limb segments. Three upper limb segments were taken into account, i.e. the right hand, the right forearm and the right shoulder. The results of the angles and velocities achieved by individual segments were analysed in three axes of the body: X, Y, Z. The results concern the beginning of the acceleration phase, the end of the acceleration phase, i.e. the moment of impact, and the final, follow-through phase. Conclusion: The results show that a stroke can be accurate despite a significant change in angle and velocity. This situation applies to both forehand and backhand strokes.

9

Improving attentional processes in sport; sport specific issues during effective playing time

88%

Schefke T. , Gronek P.

Studies in Physical Culture and Tourism

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2011

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tom 18

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nr 1

10

RELATIONSHIPS BETWEEN PHYSICAL CHARACTERISTICS AND RANKING OF YOUNG TENNIS PLAYERS

75%

Meckel Y. , Hophy A. , Dunsky A. , Eliakim A.

Central European Journal of Sport Sciences and Medicine

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2015

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tom 10

|

nr 2

5-12

EN

The purpose of the present study was: 1) to determine young tennis players’ fitness and anthropometric characteristics; and 2) to determine to what extent these characteristics relate to the players’ national ranking. Forty young (age 15.1 ±0.4) trained male tennis players, who were ranked from 1 to 40 in their age group in the country’s youth tennis players list, were tested for speed, speed endurance, flexibility, strength, specific agility and quickness, aerobic capacity, height, and weight. Significant correlations were found between the players’ ranking and speed (r = 0.430 – 0.475), specific agility and quickness (r = 0.626), speed endurance (r = 0.562), strength (r = –0.416), aerobic capacity (r = –0.581), flexibility (r = 0.352), height (r = –0.443), and weight (r = –0.293). Stepwise regression analysis indicated that specific agility and quickness accounted for almost 40% of the players’ ranking, while its combination with the players’ height accounted for 56%. The results imply the overall importance of anaerobic capabilities and tennis-specific movements to the young tennis players’ ranking. The results also emphasize the importance of tennis-specific tests to the young tennis players’ performance evaluation

11

Relative age in elite tennis

63%

O'Donoghue P.

Studies in Physical Culture and Tourism

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2009

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tom 16

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nr 4

12

Asymmetry of muscle mass distribution in tennis players

63%

Rynkiewicz M. , Rynkiewicz T. , Zurek P. , Ziemann E. , Szymanik R.

Trends in Sport Sciences

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2013

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tom 20

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nr 1

EN

Introduction. Tennis is a sport that requires asymmetric movements. Asymmetry in tennis pertains to the player carrying a racket and using it to hit the ball. An asymmetric tennis technique may lead to an asymmetric distribution of muscle mass and unbalanced muscle tonus. These disproportions will result in an improper body stature and may even cause irregularities in the skeletal structure. Aim of the Study. The aim of this study was to determine the degree of muscle mass asymmetry and its association with the dominant upper limb. Material and Methods. The study included 16 active tennis players: 15 right-handed and 1 left-handed. The control group (UN) comprised 16 non-training middle school pupils: 14 right-handed and 2 left-handed. Body composition was determined by means of bioelectrical impedance analysis (BIA). Results. Signifi cant differences between the dominant and non-dominant arms in tennis players were observed. The players featured a higher muscle mass of the dominant upper limb compared to the non-dominant limb. Similar differences were not observed amongst the controls. The control group was characterized with markedly lower asymmetry than the tennis players in terms of muscle mass distribution in the upper limbs (p < 0.05). No signifi cant correlations were found between age or training experience and the asymmetry coeffi cient values. Conclusions. The study revealed a signifi cant infl uence of sport training on asymmetry in muscle mass distribution in the upper limbs.

13

Can physical training minimize the gender differences in lung capacity of trained tennis players aged 14-17 years old?

63%

Pandit N. , Banik S. , Prasad S. K. , Majumdar P. , Banerjee O. , Bandyopadhyay A.

Medical Science Pulse

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2018

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tom 12

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nr 2

EN

Background: This study was based on gender differences in male and female trained tennis players. Aim of the study: The aim of this study was to determine the extent that physical training could minimize the gender differences in lung capacities in trained tennis players aged 14–17 years. Material and methods: The participants were ten male and seven female lawn tennis players, with a mean ± standard deviation (SD) age of 15.5 ± 1.27 and 14.43 ± 1.13 years, respectively. Physical characteristics and lung volumes were measured on the same day for each participant. Data were presented as mean ± SD, and Student’s t-test to compare the measured variables was performed. Results: Differences between genders were insignificant in terms of age (years), weight (kg), body fat (%), lean body mass (kg) and chest circumference (cm). However, height (cm), and W/H ratio were significantly (p < 0.05) higher in male tennis players in comparison to female players. Insignificant differences were found for TV (L), SVC (L), FVC (L), FEV1 (L), FEV1/FVC (%), FEF25-75% (L/s), PEF (L/s) and MVV (L/min). The only significant difference (p < 0.05) in lung function measures between male and female trained tennis players was for PIF (L/s). Conclusions: Male tennis players were taller than female tennis players of same age range, which might be advantageous for males while playing. Insignificant differences between male and female players in the various lung variables measured indicated that the influence of height and gender differences could be minimized by proper training during puberty. A significantly higher PIF in male players indicated stronger and more powerful inspiratory muscle activity compared with female tennis players.

14

Changes in the level of kinesthetic differentiation ability in table tennis players

63%

Bankosz Z. , Skarul A.

Studies in Physical Culture and Tourism

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2010

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tom 17

|

nr 1

15

Network organizations on the sports market - the case of WTA

63%

Waśkowski Z. , Radwan-Cho K.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2022

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tom z. 162

721--737

EN

Purpose: The aim of the article is to present an example of a solution applied in economic practice in the field of the structure of the global WTA network organization, with particular emphasis on the relations between its main participants - the organizers of tennis tournaments. Methodology: Considerations in the article, beyond the theoretical part, based on a review of the literature on the subject, were carried out with the use of the descriptive method. For the purposes of the article, available source materials from the resources of the WTA organization were used, as well as the co-author's own observations made during many years of cooperation with this organization. Findings: The study allowed for the identification and relatively rich description of the structure of the WTA as a network organization. It explains how the WTA organization functions on the global tennis market, on which general and theoretical principles it is created, and what benefits it brings to both the WTA and its members. Originality/value: The WTA network presented in the article and the "coalitions" of its members brings forth the diversity of the structures of network organizations. This signifies that a network integrator must skillfully shape and manage relations with emerging subgroups of stakeholders with different priorities, needs and goals.

16

Effects of Cross-Training Using Silat Practice on Psychological Profiles of Young Tennis Players

63%

Abdul Rahim L. M. R. , Shapie M. N. M. , Abdullah N. M. , Parnabas V. , Mohd Nor M. A.

Ido Movement for Culture. Journal of Martial Arts Anthropology

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2022

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tom 22

|

nr 2s

37-45

EN

Background. Silat has been found to support the development of psychological aspects in enhancing the mental toughness of an athlete. In tennis performance, psychological skills are important and it is crucial to include in the training routines. Problem and aim. Psychological factor has been identified by coaches that may affect the performance of junior tennis players. Psychological attributes that can be developed through silat practice may assist young tennis players improve their psychological performance. Therefore, this study investigated the effects of silat practice as a cross-training program on the mental toughness of junior tennis players in Malaysia. Material and methods. Thirty (n=30) nationally ranked junior tennis players between the ages of 12 to 16 years old (18 males and 12 females, mean age 14.29 ± 1.65 years) were selected using purposive sampling method and were equally divided into experimental and control groups. Both groups were involved with the same training sessions every day for eight weeks. However, the experimental group performed a 30-minute silat practice prior to their normal training sessions. All participants completed a 42 items Psychological Profiles Inventory (PPI) Questionnaire one day before and after the intervention. Results. The experimental group (n=15) showed significant improvement after the intervention while the results of the paired t-test analysis indicated that all the psychological profiles except negative energy showed a significant difference between the experimental (n=15) and the control (n=15) groups after the 8 weeks of the intervention program.Conclusions. The results in this study validate the positive effect of silat practice on the mental toughness of junior tennis players.

PL

Tło. Stwierdzono, że silat wspiera rozwój aspektów psychologicznych w zwiększaniu odporności psychicznej sportowca. By osiąganąć sukces w tenisie, umiejętności psychologiczne są bardzo ważne i należy je włączyć do rutynowych treningów. Problem i cel. Trenerzy zidentyfikowali czynniki psychologiczne, które mogą mieć wpływ na wyniki osiągane przez młodych tenisistów. Atrybuty psychologiczne, które można rozwinąć poprzez praktykę silatu, mogą pomóc młodym tenisistom w zwiększeniu ich wydajności psychologicznej. W związku z tym, w niniejszej pracy zbadano wpływ praktyki silat jako programu treningu przekrojowego na odporność psychiczną młodych tenisistów w Malezji Materiał i metody. Trzydziestu (n=30) tenisistów juniorów w wieku od 12 do 16 lat (18 mężczyzn i 12 kobiet, średnia wieku 14,29 ± 1,65 lat) zostało wybranych metodą doboru celowego i równo podzielonych na grupę eksperymentalną i kontrolną. Obie grupy uczestniczyły w tych samych sesjach treningowych każdego dnia przez osiem tygodni. Grupa eksperymentalna wykonywała jednak 30-minutowy trening silat przed normalnymi sesjami treningowymi. Wszyscy uczestnicy wypełnili Kwestionariusz 42 pozycji Inwentarza Profili Psychologicznych (PPI) dzień przed i po badaniem. Wyniki. Grupa eksperymentalna (n =15) wykazała znaczącą poprawę po interwencji, a wyniki analizy sparowanych testów t wskazały, że wszystkie profile psychologiczne z wyjątkiem negatywnej energii wykazały znaczącą różnicę pomiędzy grupą eksperymentalną (n=15) a grupą kontrolną (n=15) po 8 tygodniach programu interwencyjnego. Wnioski. Wyniki tego badania potwierdzają pozytywny wpływ treningu silat na odporność psychiczną młodych tenisistów.