Isokinetic Profile of Elbow Flexion and Extension Strength in Elite Junior Tennis Players

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.

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

Journal of Bone and Mineral Research ◽

10.1359/jbmr.1998.13.2.310 ◽

1998 ◽

Vol 13 (2) ◽

pp. 310-319 ◽

Cited By ~ 195

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

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

International Journal of Sports Physiology and Performance ◽

10.1123/ijspp.2020-0390 ◽

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.

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Excitotoxic acid lesions of the primate subthalamic nucleus result in reduced pallidal neuronal activity during active holding

Journal of Neurophysiology ◽

10.1152/jn.1992.68.5.1859 ◽

1992 ◽

Vol 68 (5) ◽

pp. 1859-1866 ◽

Cited By ~ 89

Author(s):

I. Hamada ◽

M. R. DeLong

Keyword(s):

Subthalamic Nucleus ◽

Neuronal Activity ◽

Elbow Flexion ◽

Ibotenic Acid ◽

Excitatory Input ◽

Behavioral Task ◽

Discharge Rates ◽

Before And After ◽

The Mean ◽

Flexion And Extension

1. To gain a better understanding of the pathophysiology of hemiballismus in primates, and to test directly the hypothesis that the subthalamopallidal projection is excitatory, we studied the effects of lesions of the subthalamic nucleus (STN) on neuronal activity in the globus pallidus (GP) of monkeys during performance of a motor behavioral task. 2. Animals were trained to position and hold a manipulandum to which torque pulses were applied, producing elbow flexion and extension. The activity of neurons in the external (GPe) and internal (GPi) segments of GP was recorded in two monkeys during task performance before and after STN lesions. The STN was lesioned by the fiber-sparing neurotoxins ibotenic acid and/or kainic acid. 3. After lesioning, the firing rate of neurons in both segments of GP, which was measured during the period of holding before torque application, was significantly decreased in both animals. The mean of discharge rates of GPi neurons decreased (P < 0.001) from 69.8 (n = 169, SD = 21.6) to 47.4 spikes/s (n = 180, SD = 22.6) after lesioning. The mean of discharge rates of GPe neurons decreased from 63.6 spikes/s (n = 218, SD = 25.1) before lesions to 41.0 spikes/s (n = 208, SD = 18.1) after lesioning. 4. These results provide further evidence that STN gives rise to a major excitatory input to both segments of the GP and support the hypothesis that dyskinesias result from decreased GPi output.

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

Journal of Sport and Exercise Psychology ◽

10.1123/jsep.16.4.400 ◽

1994 ◽

Vol 16 (4) ◽

pp. 400-415 ◽

Cited By ~ 71

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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A Pilot Study of Individual Muscle Force Prediction during Elbow Flexion and Extension in the Neurorehabilitation Field

Sensors ◽

10.3390/s16122018 ◽

2016 ◽

Vol 16 (12) ◽

pp. 2018 ◽

Cited By ~ 3

Author(s):

Jiateng Hou ◽

Yingfei Sun ◽

Lixin Sun ◽

Bingyu Pan ◽

Zhipei Huang ◽

...

Keyword(s):

Pilot Study ◽

Muscle Force ◽

Elbow Flexion ◽

Force Prediction ◽

Individual Muscle ◽

Flexion And Extension

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The effect of ball compression on the match-play characteristics of elite junior tennis players

Journal of Sports Sciences ◽

10.1080/02640414.2014.942683 ◽

2014 ◽

Vol 33 (3) ◽

pp. 320-326 ◽

Cited By ~ 22

Author(s):

Kim Kachel ◽

Tim Buszard ◽

Machar Reid

Keyword(s):

Match Play ◽

Tennis Players ◽

Junior Tennis

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Design and Implement an Exoskeleton Arm for Reinforcement the Human Muscles after Stroke

Al-Nahrain Journal for Engineering Sciences ◽

10.29194/njes.22040252 ◽

2019 ◽

Vol 22 (4) ◽

pp. 252-258

Author(s):

Duha Qais Abd-ul-Amir ◽

Auns Qusai Hashim ◽

Abdulnasir Hussin Ameer

Keyword(s):

Stroke Rehabilitation ◽

Elbow Flexion ◽

Mobility Limitations ◽

Basic Principles ◽

Robotic Exoskeleton ◽

Human Muscles ◽

Negative Impacts ◽

Exoskeleton Device ◽

Flexion And Extension

Mobility limitations in stroke survivors yield negative impacts on the quality of life for such individuals. Rehabilitation is needed to help them recover and regain mobility. Accordingly, this study aims to design and validate a “Robotic Exoskeleton” intended for stroke rehabilitation. The basic principles of this robotic exoskeleton device are its dependence on electromyography signal and electronic microcontroller to provide an efficient physiotherapy exercises system.The robotic exoskeleton is a one degree of freedom which performs the flexion and extension of the elbow joint. After the design was completed, 19 subjects participated in this study: 4 healthy subjects, and 15 post-stroke patients.The results showed the benefit of robotic exoskeleton in increasing the elbow range of motion, where angle of elbow flexion was raised from the first physiotherapy session to maximum elbow flexion in the last session.

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