scholarly journals The effect of female volleyball players’ leg volume and mass on balance and reaction timeBayan voleybolcuların bacak hacim ve kütlesinin denge ve reaksiyon zamanına etkisi

2015 ◽  
Vol 12 (2) ◽  
pp. 1296 ◽  
Author(s):  
Serkan İbiş ◽  
Rüçhan İri ◽  
Zait Burak Aktuğ
Keyword(s):  
Reaction Time ◽  
Significant Relationship ◽  
Dynamic Balance ◽  
Average Weight ◽  
Average Height ◽  
Measuring Device ◽  
Balance System ◽  
The Third ◽  
Volleyball Players ◽  
Visual Reaction

<p>In this study, it is aimed to investigate the relationship between leg volume - mass and balance – reaction time of the third league female volleyball players. 20 volunteer third league volleyball players, who are still active, are participated in this study. The average age of participant female volleyball players is 23,20±3,42 years, average height 176,30±7,78 cm, average weight 65.11±8,22 kg. Participant female volleyball players’ leg volume by Frustum method, leg mass by Hanavan method, static and dynamic balance by Biodex Balance System and visual reaction time by MOART Lafayette Reaction Measuring Device were measured. In analyzing the relation among the measurements, Pearson Product Moment Correlation coefficient was used. As a result of analysis of the obtained data; significant moderate correlation was found between the legs mass and dynamic balance (r=0.654, p&lt;0,05). It was determined with a highly significant relationship between leg mass and foot volume (r=0.913, p&lt;0,01) and foot mass (r=0.917, p&lt;0,01). Also a significant relationship was found between leg volume and foot volume (r=0.800, p&lt;0,01) and foot mass (r=0.644, p&lt;0,05).</p><p>Consequently; it can be said that there is a highly significant relationship between leg volume-mass and foot volume-mass, and there is a relationship between dynamic balance and leg mass of the third league female volleyball players.</p><p> </p><p><strong>Özet</strong></p><p>Bu çalışmada, üçüncü lig bayan voleybolcuların bacak hacimleri ile denge ve reaksiyon zamanları arasındaki ilişkinin incelenmesi amaçlanmıştır. Çalışmaya üçüncü ligde oynayan toplam 20 gönüllü bayan voleybolcu katılmıştır. Çalışmaya katılan bayan voleybolcuların yaş ortalamaları 23,20±3,42 yıl, boy ortalamaları 176,30±7,78 cm, ağırlık ortalamaları 65.11±8,22 kg’dır. Çalışmada katılan bayan voleybolcuların bacak hacmi Frustum yöntemi, bacak kütlesi Hanavan yöntemi, statik-dinamik denge ölçümü Biodex Denge Sistemi ve görsel reaksiyon zamanı ölçümleri MOART Lafayette Reaksiyon Ölçüm cihazı ile ölçülmüştür. Elde edilen ölçümler arasındaki ilişkiyi belirlemek amacıyla Pearson Çarpımlar Moment Korelasyon katsayısı kullanılmıştır. Elde edilen verilerin analizi sonucunda; bacak kütlesi ile dinamik denge arasında orta düzeyde (r=0.654, p&lt;0,05), bacak kütlesi ile ayak hacmi (r=0.913, p&lt;0,01) ve ayak kütlesi (r=0.917, p&lt;0,01) arasında yüksek düzeyde ilişki bulunurken; bacak hacmi ile ayak hacmi (r=0.800, p&lt;0,01) ve ayak kütlesi (r=0.644, p&lt;0,05) arasında ilişki tespit edilmiştir.</p><p>Sonuç olarak; çalışmadaki bulgular 3. Ligde oynayan bayan voleybolcuların bacak hacmi ve bacak kütlesinin ayak kütlesi ve ayak hacmi ile yüksek düzeyde ilişki gösterdiği, dinamik dengenin de bacak kütlesiyle ilişkili olduğu tespit edilmiştir.</p>

scholarly journals Positional differences in anticipation timing, reaction time and dynamic balance of American football players

2020 ◽  
Vol 24 (5) ◽  
pp. 227-239
Author(s):  
Halil İ. Ceylan ◽  
Ahmet R. Günay
Keyword(s):  
Reaction Time ◽  
Dynamic Balance ◽  
Absolute Error ◽  
American Football ◽  
Football Players ◽  
Balance Performance ◽  
Significant Difference ◽  
Visual Reaction ◽  
Test Result ◽  
Anterior Posterior

Purpose: The aim of this study was to compare the coinciding anticipation timing (CAT), reaction time and dynamic balance performances of American football players according to their playing positions. Material: Thirty-five American football players, who train at least 3 days a week, and compete in Universities Protected Football 1st League, participated in this study, voluntarily. The players were divided into two playing positions: offensive (17 players, mean age: 20.76 ± 1.30 years) and defensive (18 players, mean age: 21.94 ± 2.87 years). The CAT at different stimulus speeds (6 mph, 12 mph), reaction time (visual, auditory, mixed), and dynamic balance performance (anterior-posterior, medial-lateral, perimeter lenght) were measured in the laboratory environment. The CAT, reaction time, and dynamic balance performance of players were determined by Bassin Anticipation Timer, Newtest 1000, and Technobody Prokin-200, respectively. Results: The data obtained were analyzed in SPSS (20.0) program. Firstly, the raw data for CAT performance (6mph, 12 mph) were converted to absolute error score. According to Shapiro-Wilk test result, the all data showed normal distribution. Independent Sample t test was used to determine the differences between the two playing positions. In addition, the effect size between the two playing positions was calculated in parameters with showing significant differences, and Cohen’s d (1988) values were taken into account. Compared with the defensive players (20.15±3.81 ms), the absolute error scores at fast stimulus speeds (12 mph) of offensive players (17.45±3.48 ms) was found to be significantly lower (t(33) =-2.181, p=.036). The visual reaction time of offensive players (318.11± 17.47 ms) was significantly shorter than defensive players (340.58± 32.60 ms, t(26322) =-2.560, p=.017). In terms of dynamic balance parameters such as perimeter lenght, anterior-posterior, and medial-lateral, there was no statistically significant difference between the playing positions (p>0.05). Conclusions: Perceptual-cognitive characteristics such as CAT, and reaction time performance differ according to the playing positions, and this difference may be related to the physical, and cognitive demands required by their playing positions.

scholarly journals PSYCHOPHYSIOLOGICAL FEATURES OF VOLLEYBALL PLAYERS WITH HEARING IMPAIRMENT

2020 ◽  
Vol 20 (S1) ◽  
pp. 128-135
Author(s):  
O Litovchenko ◽  
A Maximova
Keyword(s):  
Nervous System ◽  
Reaction Time ◽  
Hearing Impairment ◽  
Symmetric Distribution ◽  
Functional Capabilities ◽  
Volleyball Players ◽  
Visual Reaction ◽  
The Central Nervous System ◽  
Motor Tests ◽  
The Right

Aim. The paper aims to reveal the features of the central nervous system and interhemispheric asymmetry in volleyball players with hearing impairment. Materials and methods. The study involved 14 athletes of various sports experience with varying degrees of hearing impairment aged from 20 to 35 years (average age 29.20 ± 1.3 years). Simple visual reaction was studied in terms of the reaction time, reaction stability, and functional capabilities of the nervous system. To establish the manual asymmetry, the M. Annette questionnaire and motor tests (dynamometry, tests for intertwined fingers, the applause test) were used, the coefficient of the right hand was calculated. When detecting visual asymmetry, the Rosenbach test and the telescope test were used. The coefficient of the right eye was also calculated. Results. It was established that a third of the examined athletes had a symmetric distribution of signs in both the visual and manual spheres. The reliable dependence between symmetric distribution and sports titles was not found. The reaction time in volleyball players with hearing impairment was reduced. The reaction stability and the level of functional capabilities were within the normal range and had a significant dependence on the sports rank and category. Conclusion. It was revealed that volleyball players with hearing impairment formed a special type of interhemispheric interaction characterized by a more uniform distribution between the right and left hemispheres, which resulted in low values of manual and visual asymmetry.

scholarly journals Review of body balance research methods

2018 ◽  
Vol 22 (3) ◽  
pp. 50-56 ◽  
Author(s):  
Bożena Jenek ◽  
Agata Skorupińska
Keyword(s):  
Motor Skills ◽  
Dynamic Balance ◽  
The Body ◽  
Measuring Device ◽  
Body Balance ◽  
Creative Commons ◽  
Balance System ◽  
Reliable Assessment ◽  
And Gender ◽  
The Impact

A man's physical fitness largely depends on the ability to maintain body balance. This ability is examined by using various methods and tests, still searching for the best way of its evaluation. Body balance is discussed from different aspects and in relation to various developmental periods. Usually, static and dynamic balance are distinguished. Commonly used computer techniques and different kinds of tests of balance evaluation are still not satisfactory and they constitute a topic for discussion over the value of these measurements. Balance system of the body require the interaction of many mechanisms, which undoubtedly, impedes the construction of the measuring device used for its accurate and reliable assessment, both in static and dynamic conditions. The conducted research on linking body balance with other manifestations of a man's motor skills, for example the impact of body composition and gender on the level of this feature, is very helpful in the accurate assessment of this feature among the youth and children. The differences, resulting from the interaction between environmental and genetic factors, in somatic potential that are manifested in different body size and body proportions, may be decisive of a children’s motor skills and predispositions. It has been proved that the influence of specific exercises can effectively influence the level of children's balance. The purpose of the report is to review different methods of body balance examination. The PubMed and Scopus databases have been searched. The following keywords were used in the search: balance, postural balance, coordination, coordination diagnostics. This article is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. null

scholarly journals Relationship Between Isokinetic Leg Strength and Dynamic Balance Performance of Elite Male Volleyball Players

2019 ◽  
Vol 7 (7) ◽  
pp. 138
Author(s):  
Yakup Aktaş
Keyword(s):  
Angular Velocity ◽  
Significant Relationship ◽  
Dynamic Balance ◽  
Balance Performance ◽  
Significance Level ◽  
Leg Strength ◽  
Hamstring Muscles ◽  
Volleyball Players ◽  
Bilateral Differences ◽  
The Relationship

Objective: This study aims at analysing the relationship between isokinetic leg strength and dynamic balance performances of MSK Urfa male volleyball players that play in Turkey Volleyball League of Swashbucklers.Materials and Methods: 13 voluntary volleyball players that played in MSK Urfa being a team in League of Swashbucklers in 2016-2017 season participated in the study. Bioelectric Impedance Measurement Device (Tanita MC 180) was used to measure body composition of volleyball players. Isokinetic dynamometer (IsoMed 2000 GmbH, Germany) was used to measure their isokinetic leg strength. Tecnobody Prokin device was used to measure their dynamic balance performance. The relationship between isokinetic leg strength and dynamic balance performance was determined by Spearman correlation analysis and the significance level was accepted as p <0.05.Findings: According to the data obtained from the study, there was no statistically significant relationship between the dynamic balance performance of volleyball players and the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 60°/s (p>0,05); but there was statistically significant relationship between the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 120°/s (p<0,05).There was no statistically significant relationship between dynamic balance performance and Hamstring/Quadriceps (H/Q) force ratio of dominant and non-dominant leg at angular velocity of 60°/s and 120°/s (p> 0.05).As a result; it was observed that the bilateral differences of hamstring and quadriceps muscles of volleyball players at 120°/s velocity affected their dynamic balance performance; but H/Q ratio at 60°/s and 120°/s velocity did not affect their dynamic balance performance.

Research on Dynamic Balance Method of Precision Centrifuge

2014 ◽  
Vol 945-949 ◽  
pp. 777-780
Author(s):  
Tao Liu ◽  
Yong Xu ◽  
Bo Yuan Mao
Keyword(s):  
Mathematical Model ◽  
Balance Control ◽  
Dynamic Balance ◽  
Dynamic Balancing ◽  
Structure Characteristics ◽  
Balance System ◽  
Simulation Results ◽  
Set Up ◽  
System Controller ◽  
The Mathematical Model

Firstly, according to the structure characteristics of precision centrifuge, the mathematical model of its dynamic balancing system was set up, and the dynamic balancing scheme of double test surfaces, double emendation surfaces were established. Then the dynamic balance system controller of precision centrifuge was designed. Simulation results show that the controller designed can completely meet the requirements of precision centrifuge dynamic balance control system.

scholarly journals The molecular footprints of COVID-19

2020 ◽  
Vol 45 (3) ◽  
pp. 241-248
Author(s):  
Engin Yilmaz ◽  
Yakut Akyön ◽  
Muhittin Serdar
Keyword(s):  
Reaction Time ◽  
Changing Environment ◽  
The Third ◽  
The Past ◽  
The People ◽  
The World ◽  
The Future ◽  
Host Virus Interactions ◽  
Virus Interactions

AbstractCOVID-19 is the third spread of animal coronavirus over the past two decades, resulting in a major epidemic in humans after SARS and MERS. COVID-19 is responsible of the biggest biological earthquake in the world. In the global fight against COVID-19 some serious mistakes have been done like, the countries’ misguided attempts to protect their economies, lack of international co-operation. These mistakes that the people had done in previous deadly outbreaks. The result has been a greater economic devastation and the collapse of national and international trust for all. In this constantly changing environment, if we have a better understanding of the host-virus interactions than we can be more prepared to the future deadly outbreaks. When encountered with a disease which the causative is unknown, the reaction time and the precautions that should be taken matters a great deal. In this review we aimed to reveal the molecular footprints of COVID-19 scientifically and to get an understanding of the pandemia. This review might be a highlight to the possible outbreaks.

scholarly journals Soft Tissue Mobilization and Stretching for Shoulder in CrossFitters: A Randomized Pilot Study

2021 ◽  
Vol 18 (2) ◽  
pp. 575
Author(s):  
Marcos Jusdado-García ◽  
Rubén Cuesta-Barriuso
Keyword(s):  
Soft Tissue ◽  
Internal Rotation ◽  
Repeated Measures ◽  
Control Group ◽  
Average Weight ◽  
Average Height ◽  
Shoulder Injury ◽  
Glenohumeral Internal Rotation Deficit ◽  
Posterior Shoulder ◽  
Soft Tissue Mobilization

Background. The shoulder in CrossFit should have a balance between mobility and stability. Glenohumeral internal rotation deficit and posterior shoulder stiffness are risk factors for overhead shoulder injury. Objective. To determine the effectiveness of instrument-assisted soft tissue mobilization and horizontal adduction stretch in CrossFit practitioners’ shoulders. Methods: Twenty-one regular CrossFitters were allocated to experimental (stretching with isometric contraction and instrument-assisted soft tissue mobilization) or control groups (instrument-assisted soft tissue mobilization). Each session lasted 5 min, 2 days a week, over a period of 4 weeks. Shoulder internal rotation and horizontal adduction (digital inclinometer), as well as posterior shoulder stretch perception (Park scale), were evaluated. Shapiro–Wilk test was used to analyze the distribution of the sample. Parametric Student’s t-test was used to obtain the intragroup differences. The inter- and intra-rater differences were calculated using a repeated measures analysis of variance (ANOVA). Results. Average age was 30.81 years (SD: 5.35), with an average height of 178 (SD: 7.93) cm and average weight of 82.69 (SD: 10.82) kg. Changes were found in the experimental group following intervention (p < 0.05), and when comparing baseline and follow-up assessments (p < 0.05) in all variables. Significant differences were found in the control group following intervention (p < 0.05), in right horizontal adduction and left internal rotation. When comparing the perception of internal rotation and horizontal adduction in both groups, significant differences were found. Conclusions. Instrument-assisted soft tissue mobilization can improve shoulder horizontal adduction and internal rotation. An instrument-assisted soft tissue mobilization technique yields the same results alone as those achieved in combination with post-isometric stretch with shoulder adduction.

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