scholarly journals ACUTE EFFECTS OF CUSTOMIZING A TENNIS RACKET ON SERVE SPEED

2017 ◽  
Vol 1 (104) ◽  
pp. 44-46 ◽  
Author(s):  
Mustafa Söğüt
Keyword(s):  
Repeated Measures ◽  
Acute Effects ◽  
Limited Evidence ◽  
Vast Number ◽  
Performance Levels ◽  
Tennis Players ◽  
Tennis Racket ◽  
Repeated Measures Design ◽  
And Performance ◽  
Lead Weights

Background. A vast number of tennis players use additional lead weights attached to their rackets in order to improve stroke performances. However, there is limited evidence that racket customization as such boosts efficiency in different age and performance levels. The purpose of this repeated measures design study was to determine the acute effects of adding weight to the tip of a racket on serve speed in tennis players. Methods. Participants were male tennis players from three different age and performance levels: elite junior (n = 7, age = 15.71 ± 0.95 years), colligate (n = 11, age = 22.36 ± 2.54 years), and senior recreational (n = 17, age = 52.94 ± 9.43 years). Three identical rackets, two of which were customized by adding ten and twenty gram lead weights on the tips, were used for the measurements. A radar gun was utilized to assess serve speed of the participants. Results. The repeated measures ANOVA results revealed no significant differences among serve speed scores for the three conditions in each group. Conclusion. Results suggest that customizing a tennis racket by adding lead weight to the tip might not necessarily yield differences in serve speeds in tennis players from different age and performance levels.

scholarly journals The Acute Effects of a Swimming Session on the Shoulder Rotators Strength and Balance of Age Group Swimmers

2021 ◽  
Vol 18 (15) ◽  
pp. 8109
Author(s):  
Nuno Batalha ◽  
Jose A. Parraca ◽  
Daniel A. Marinho ◽  
Ana Conceição ◽  
Hugo Louro ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Training Session ◽  
Age Group ◽  
Acute Effects ◽  
Muscle Strengthening ◽  
Repeated Measures Design ◽  
Before And After ◽  
Shoulder Strength ◽  
Isometric Torque ◽  
Gender Specific

The purpose of this study was to analyze the acute effects of a standardized water training session on the shoulder rotators strength and balance in age group swimmers, in order to understand whether a muscle-strengthening workout immediately after the water training is appropriate. A repeated measures design was implemented with two measurements performed before and after a standardized swim session. 127 participants were assembled in male (n = 72; age: 16.28 ± 1.55 years, height: 174.15 ± 7.89 cm, weight: 63.97 ± 6.51 kg) and female (n = 55; age: 15.29 ± 1.28 years, height: 163.03 ± 7.19 cm, weight: 52.72 ± 5.48 kg) cohorts. The isometric torque of the shoulder internal (IR) and external (ER) rotators, as well as the ER/IR ratios, were assessed using a hand-held dynamometer. Paired sample t-tests and effect sizes (Cohen’s d) were used (p ≤ 0.05). No significant differences were found on the shoulder rotators strength or balance in males after training. Females exhibited unchanged strength values after practice, but there was a considerable decrease in the shoulder rotators balance of the non-dominant limb (p < 0.01 d = 0.366). This indicates that a single practice seems not to affect the shoulders strength and balance of adolescent swimmers, but this can be a gender specific phenomenon. While muscle-strengthening workout after the water session may be appropriate for males, it can be questionable regarding females. Swimming coaches should regularly assess shoulder strength levels in order to individually identify swimmers who may or may not be able to practice muscle strengthening after the water training.

The Relationship Between Affect and Performance in Competitive Intercollegiate Tennis: A Dynamic Conceptualization and Application

2007 ◽  
Vol 1 (2) ◽  
pp. 130-146 ◽  
Author(s):  
Michael B. Johnson ◽  
William A. Edmonds ◽  
Gershon Tenenbaum ◽  
Akihito Kamata
Keyword(s):  
Sport Psychology ◽  
Dynamic Nature ◽  
Performance Levels ◽  
Tennis Players ◽  
Multiple Data ◽  
Data Points ◽  
And Performance ◽  
Affective Intensity ◽  
The Relationship

A recently introduced probabilistic methodology (Kamata, Tenenbaum, & Hanin, 2002) was implemented in the current study to ascertain the idiosyncratic Individual Affect-related Performance Zones (IAPZs) of four intercollegiate tennis players. The current study advances upon previous empirical works by its use of multiple performance levels, use of athletes’ introspective affective intensity, and recording multiple data points duringcompetition. Results present within- and between-player comparisons, and highlight the dynamic nature of competitive athletic events. A brief discussion regarding the implications of this methodology and the pursuant results for sport psychology consultants is also proffered. Being idiosyncratic in nature, the observations from this study are not intended to generalize across samples, but rather to introduce how knowledge of the systematic and dynamic linkage between an individual’s affect and his or her performance can be uncovered and possibly used with individual athletes to facilitate more consistently optimal performances.

scholarly journals The Acute Effects of Yoga on Executive Function

2013 ◽  
Vol 10 (4) ◽  
pp. 488-495 ◽  
Author(s):  
Neha Gothe ◽  
Matthew B. Pontifex ◽  
Charles Hillman ◽  
Edward McAuley
Keyword(s):  
Aerobic Exercise ◽  
Cognitive Performance ◽  
Repeated Measures ◽  
Reaction Times ◽  
Exercise Bout ◽  
Exercise Session ◽  
Acute Effects ◽  
Cognitive Assessments ◽  
Repeated Measures Design ◽  
The Relationship

Background:Despite an increase in the prevalence of yoga exercise, research focusing on the relationship between yoga exercise and cognition is limited. The purpose of this study was to examine the effects of an acute yoga exercise session, relative to aerobic exercise, on cognitive performance.Methods:A repeated measures design was employed where 30 female college-aged participants (Mean age = 20.07, SD = 1.95) completed 3 counterbalanced testing sessions: a yoga exercise session, an aerobic exercise session, and a baseline assessment. The flanker and n-back tasks were used to measure cognitive performance.Results:Results showed that cognitive performance after the yoga exercise bout was significantly superior (ie, shorter reaction times, increased accuracy) as compared with the aerobic and baseline conditions for both inhibition and working memory tasks. The aerobic and baseline performance was not significantly different, contradicting some of the previous findings in the acute aerobic exercise and cognition literature.Conclusion:These findings are discussed relative to the need to explore the effects of other nontraditional modes of exercise such as yoga on cognition and the importance of time elapsed between the cessation of the exercise bout and the initiation of cognitive assessments in improving task performance.

THE EFFECT OF BALLET DANCE AT IRE ON BODY AND SELF-PERCEPTIONS OF FEMALE DANCERS

2006 ◽  
Vol 34 (8) ◽  
pp. 991-998 ◽  
Author(s):  
Brena R. Price ◽  
Terry F. Pettijohn
Keyword(s):  
Body Image ◽  
Repeated Measures ◽  
Performance Level ◽  
The Other ◽  
Design Experiment ◽  
Body Perception ◽  
Ballet Dancers ◽  
Repeated Measures Design ◽  
Self Perceptions ◽  
And Performance

Body and self-perceptions of female ballet dancers (N = 38) were assessed in a repeated measures design experiment investigating the effects of dance attire. Participants were randomly assigned to complete a ballet class dressed in a black leotard with pink tights or dressed in their choice of loose-fitting clothing referred to by dancers as “junk.” The next day, participants completed a ballet class in the other clothing condition. After completing the ballet class each day, dancers completed surveys regarding self-perceived body image and performance level. Results revealed that participants reported significantly lower self- and body-perception ratings in the leotard with tights attire condition compared to the loose-fitting clothing condition. These results have implications for the effects of required dance attire on female dancer perceptions.

I Like Myself, I Really Do (at Least Right Now)

2020 ◽  
Vol 36 (1) ◽  
pp. 196-206 ◽  
Author(s):  
Almut Rudolph ◽  
Michela Schröder-Abé ◽  
Astrid Schütz
Keyword(s):  
Construct Validity ◽  
Performance Feedback ◽  
Repeated Measures ◽  
Temporal Stability ◽  
Social Feedback ◽  
Student Sample ◽  
Empirically Supported ◽  
Good Internal Consistency ◽  
And Performance ◽  
Induced Changes

Abstract. In five studies, we evaluated the psychometric properties of a revised German version of the State Self-Esteem Scale (SSES; Heatherton & Polivy, 1991 ). In Study 1, the results of a confirmatory factor analysis on the original scale revealed poor model fit and poor construct validity in a student sample that resembled those in the literature; thus, a revised 15-item version was developed (i.e., the SSES-R) and thoroughly validated. Study 2 showed a valid three-factor structure (Performance, Social, and Appearance) and good internal consistency of the SSES-R. Correlations between subscales of trait and state SE empirically supported the scale’s construct validity. Temporal stability and intrapersonal sensitivity of the scale to naturally occurring events were investigated in Study 3. Intrapersonal sensitivity of the scale to experimentally induced changes in state SE was uncovered in Study 4 via social feedback (acceptance vs. rejection) and performance feedback (positive vs. negative). In Study 5, the scale’s interpersonal sensitivity was confirmed by comparing depressed and healthy individuals. Finally, the usefulness of the SSES-R was demonstrated by assessing SE instability as calculated from repeated measures of state SE.

Probability-Based and Measurement-Related Hypotheses With Full Restriction for Investigations by Means of Confirmatory Factor Analysis

Methodology ◽  
2011 ◽  
Vol 7 (4) ◽  
pp. 157-164
Author(s):  
Karl Schweizer
Keyword(s):  
Factor Analysis ◽  
Confirmatory Factor Analysis ◽  
Cognitive Processing ◽  
Latent Variables ◽  
Repeated Measures ◽  
Latent Variable ◽  
Model Fit ◽  
Repeated Measures Data ◽  
Confirmatory Factor ◽  
And Performance

Probability-based and measurement-related hypotheses for confirmatory factor analysis of repeated-measures data are investigated. Such hypotheses comprise precise assumptions concerning the relationships among the true components associated with the levels of the design or the items of the measure. Measurement-related hypotheses concentrate on the assumed processes, as, for example, transformation and memory processes, and represent treatment-dependent differences in processing. In contrast, probability-based hypotheses provide the opportunity to consider probabilities as outcome predictions that summarize the effects of various influences. The prediction of performance guided by inexact cues serves as an example. In the empirical part of this paper probability-based and measurement-related hypotheses are applied to working-memory data. Latent variables according to both hypotheses contribute to a good model fit. The best model fit is achieved for the model including latent variables that represented serial cognitive processing and performance according to inexact cues in combination with a latent variable for subsidiary processes.

Power of Modified Brown-Forsythe and Mixed-Model Approaches in Split-Plot Designs

Methodology ◽  
2017 ◽  
Vol 13 (1) ◽  
pp. 9-22 ◽  
Author(s):  
Pablo Livacic-Rojas ◽  
Guillermo Vallejo ◽  
Paula Fernández ◽  
Ellián Tuero-Herrero
Keyword(s):  
Repeated Measures ◽  
Statistical Power ◽  
Mixed Model ◽  
Covariance Structure ◽  
Simulation Method ◽  
Future Research ◽  
Repeated Measures Design ◽  
Fixed And Random Effects ◽  
Split Plot ◽  
High Level

Abstract. Low precision of the inferences of data analyzed with univariate or multivariate models of the Analysis of Variance (ANOVA) in repeated-measures design is associated to the absence of normality distribution of data, nonspherical covariance structures and free variation of the variance and covariance, the lack of knowledge of the error structure underlying the data, and the wrong choice of covariance structure from different selectors. In this study, levels of statistical power presented the Modified Brown Forsythe (MBF) and two procedures with the Mixed-Model Approaches (the Akaike’s Criterion, the Correctly Identified Model [CIM]) are compared. The data were analyzed using Monte Carlo simulation method with the statistical package SAS 9.2, a split-plot design, and considering six manipulated variables. The results show that the procedures exhibit high statistical power levels for within and interactional effects, and moderate and low levels for the between-groups effects under the different conditions analyzed. For the latter, only the Modified Brown Forsythe shows high level of power mainly for groups with 30 cases and Unstructured (UN) and Autoregressive Heterogeneity (ARH) matrices. For this reason, we recommend using this procedure since it exhibits higher levels of power for all effects and does not require a matrix type that underlies the structure of the data. Future research needs to be done in order to compare the power with corrected selectors using single-level and multilevel designs for fixed and random effects.

Lifestyle intervention using modified BASNEF model in hypertension management (Preprint)

2020 ◽  
Author(s):  
Resti Tito Villarino ◽  
Christopher Arcay ◽  
Maria Concepcion Temblor
Keyword(s):  
Lifestyle Intervention ◽  
Repeated Measures ◽  
Intervention Program ◽  
Phase 1 ◽  
Management Technique ◽  
Enabling Factors ◽  
Educational Models ◽  
Stroke Risk Factor ◽  
Repeated Measures Design ◽  
Lifestyle Intervention Program

BACKGROUND Hypertension is a serious health issue and a major cardiovascular disease and stroke risk factor. In hypertensive patients, various health educational models have been used to improve their lifestyle, but the findings are inconsistent. OBJECTIVE The study assessed the effects of a lifestyle intervention program using modified Beliefs, Attitude, Subjective Standards, Enabling Factors (BASNEF) model among non-adherent hypertensive respondents in relation to the introduction of a lifestyle intervention program in the management of hypertension. METHODS This is a quantitative quasi-experimental research particularly utilizing a repeated-measures design of within-subjects approach on the 50 non-adherent patients diagnosed with essential hypertension at Moalboal, Cebu, Philippines in 2019. The respondents received five sessions of trainings based on modified BASNEF model. The Morisky Medication Adherence instrument was used. The first phase included a demographic questionnaire and the last phase comprised the evaluation of the program. Frequencies, percentages, means and standard deviations for descriptive statistics while t-test, repeated measures, ANOVA, and Pearson product moment correlation for inferential statistics. RESULTS The result indicated that the phase 1 mean (146.5) of the systolic readings differ significantly from the phase 4 mean (134.92) of the systolic readings. However, since these two means came from phases that were not consecutive, the result, as a whole, did not show a significant decrease or change when analyzed chronologically from one phase to the next. CONCLUSIONS The study has established that BASNEF model approach can be an effective BP management technique.

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