scholarly journals Comparison of Power, Velocity and Force Parameters during Loaded Squat Jump Exercise in the Handball and Arm Wrestling Players

2017 ◽  
Vol 5 (12) ◽  
pp. 92 ◽  
Author(s):  
Ibrahim Can
Keyword(s):  
Measurement System ◽  
Performance Indicator ◽  
Mean Power ◽  
Mean Velocity ◽  
Squat Jump ◽  
National Team ◽  
Jump Exercise ◽  
Significant Difference ◽  
Jump Velocity ◽  
Jump Ability

The purpose of this study was to compare power, velocity and force parameters during loaded squat jump (SJ) exercise in the handball and arm wrestling players. In accordance with this purpose, ten arm wrestling athletes from the Turkish National Team (age: 20,7 ± 3,05 years; height: 175,2 ± 5,55 cm; weight: 71,7 ± 8,17 kg) who had ranks in competitions at World and Europe Am Wrestling Championships and ten handball players (age: 23,0 ± 4,00 years; height: 182,3 ± 6,06 cm; weight: 77,8 ± 11,3 kg) who competed at Turkish handball 1st league participated voluntarily in this study. Subjects were performed loaded SJ exercise using a load equals to 40 % of their body weight and obtained the power, velocity and force values using an isoinertial measurement system (T-Force Dynamic Measurement System). For data analysis, descriptive statistic and Mann Whitney - U analyses were used. According to analysis results, there was a statistically significant difference between jump velocity during loaded SJ of handball players and arm wrestling athletes (p < 0.05). Accordingly, arm wrestling athletes have better jump velocity than handball players in terms of mean velocity (MV) and peak velocity (PV). In addition, it was obtained that there wasn’t a statistically significant difference between handball and arm wrestling players in terms of mean force (MF), mean propulsive force (MPF), peak force (PF), peak power (PP), mean propulsive power (MPP), mean power (MP), time and moving distance to barbell bar during loaded SJ (p > 0.05). Consequently, jump ability is a crucial performance indicator in many sports that require explosive actions and the lower-body muscular power. However, it is not a true approach that athletes competing at sport branches which jump ability is an important performance indicator can display a better performance during loaded SJ.

scholarly journals Comparison of the Velocity and Power Parameters During Loaded-Squat Jump Exercise of National Athletes in Different Branches

2018 ◽  
Vol 6 (5) ◽  
pp. 16 ◽  
Author(s):  
Ibrahim Can ◽  
Hamit Cihan ◽  
Erdal Ari ◽  
Serdar Bayrakdaroglu
Keyword(s):  
Peak Power ◽  
Mean Power ◽  
Mean Velocity ◽  
Squat Jump ◽  
Jump Exercise ◽  
Significant Difference ◽  
Body Weights ◽  
Statistical Program ◽  
One Way Anova ◽  
Analyze Data

The aim of this investigation is to compare velocity and power variables during loaded-squat jump (SJLoaded) exercise of national athletes dealing with different sports branches and to identify whether velocity and power parameters become different or not according to branches. In accordance with this purpose, a total of 36 national athletes (age: 20.3±1.68 years; height: 173.5±6.46 cm; weight: 72.3±10.29 kg) composed of 12 wrestlers (age: 19.5±.90 years; height: 172.3±6.19 cm; weight: 75.5±13.9 kg), 12 arm wrestlers (age: 20.5±2.02 years; height: 174.7±4.76 cm; weight: 72.6±8.31 kg) and 12 kickboxers (age: 20.7±1.81 years; height: 173.5±8.29 cm; weight: 68.9±6.94 kg) dealing with different sports branches have voluntarily participated in this study. For identifying velocity and power parameters, SJLoaded exercise was executed with an external load that corresponds to 40% of body weights of the athletes by utilizing an isoinertial velocity transducer (T-Force dynamic measurement system) and values of mean velocity (MV), mean propulsive velocity (MPV), peak velocity (PV), mean power (MP), mean propulsive power (MPP) and peak power (PP) were determined. All data analyzes were performed in the SPSS 16.0 statistical program. Firstly, in order to analyze data, it was determined that the data indicated normal distribution by looking at the Shapiro-Wilk coefficient regarding the normality of the distribution of the data. Therefore one-way analysis of variance (One-way ANOVA) was utilized to identify statistical significant differences among athletes competing in different branches with regard to the velocity and power variables during the SJLoaded exercise. According to analyze results, no statistical significant difference wasn’t seen among branches with regard to MV [f (2.33) = 1.306], MPV [f (2. 33)=2.195], PV [f (2. 33)=2.242], MP [f (2. 33)=1.225], MPP [f (2. 33)=2.787] and PP [f (2. 33)= 2.607] parameters during SJLoaded exercise (p>0.05). The velocity and power parameters obtained in the SJLoaded exercise don’t differ according to the branches.

scholarly journals The Relationship between Repeated Sprint Performance and Velocity Values during Loaded-Squat Jump Exercise

2018 ◽  
Vol 7 (2) ◽  
pp. 280
Author(s):  
Ibrahim Can ◽  
Seda Sadik ◽  
Serdar Bayrakdaroglu
Keyword(s):  
Peak Velocity ◽  
Sprint Performance ◽  
Fatigue Index ◽  
Mean Velocity ◽  
Squat Jump ◽  
Repeated Sprint ◽  
Jump Exercise ◽  
Significant Difference ◽  
Study Participants ◽  
The Relationship

The purpose of this study is to investigate the relationship between repeated sprint performance and velocity values during loaded-squat jump exercise. In accordance with this purpose, 23 kickboxing athletes (age: 21,1 ± 2,10 years; height: 178,7±5,01 cm; weight: 70,8±7,85 kg) participated voluntarily in this study. Participants were performed to repeated sprint test and loaded-squat jump exercise by using an external load corresponding to 40 % of their body weight and velocity parameters were obtained as mean velocity (MV), mean propulsive velocity (MPV) and peak velocity (PV). Descriptive statistics were used in analysis of data. In addition, Spearman Correlation Analysis was used to determine the relationship between repeated sprint performance and velocity values during loaded-squat jump exercise. According to the analysis results; while total running times and fatigue index values in repeated sprint test of subjects were obtained as 52.4 (±1.96 sec) and 4.98 (±2.36%) respectively; velocity values during loaded-squat jump exercise were obtained as 1.38 (±,07 m/s-1) for MP, 1.54 (±,10 m/s-1) for MPV, and 2.58 (±,15 m/s-1) for PV. In addition, it was determined that there was no any statistically significant difference between MP (r= - ,148; r= - ,072, p>0.05, respectively), MPV (r= - ,335; r= - ,150, p>0.05, respectively), PV (r= ,010; r= - ,034, p>0.05 respectively) and total running time and fatigue index values in repeated sprint test. As a result, it can be suggested that velocity values during loaded squat jump exercise have no statistically significant effect on repeated sprint performance.

scholarly journals Caracterización y asociación del rendimiento físico en futbolistas Chilenos con parálisis cerebral (Characterization and association of the physical performance of Chilean football players with cerebral palsy)

Retos ◽  
2020 ◽  
pp. 126-134
Author(s):  
Matías Henríquez ◽  
Felipe Herrera ◽  
Fernando Muñoz ◽  
Cristian Luarte Rocha ◽  
Mónica Fernández ◽  
...  
Keyword(s):  
Cerebral Palsy ◽  
Physical Performance ◽  
Football Players ◽  
Sports Performance ◽  
Countermovement Jump ◽  
Squat Jump ◽  
Performance Variables ◽  
National Team ◽  
Jump Ability ◽  
The Relationship

  Objetivo: el objetivo de este estudio fue: i) Caracterizar el perfil del rendimiento físico de los futbolistas con parálisis cerebral (PC) de la selección Chilena de fútbol 7 acorde a su clasificación deportiva (CD) y posición de juego; ii) Analizar la relación entre las variables de rendimiento físico con la CD. Método: Participaron 19 jugadores varones con PC pertenecientes a la selección Chilena de fútbol 7 agrupados según CD (FT1, FT2, FT3) y posición de juego. Se realizaron mediciones de agilidad (AG), capacidad de realizar sprint repetido (RSA), distancia recorrida en la prueba Yo-Yo (D), capacidad de salto con las pruebas Squat Jump (SJ) y Countermovement Jump (CMJ). Resultados: Se encontraron diferencias significativas de acuerdo a las CD donde los jugadores FT3 lograron un mayor rendimiento en las pruebas de AG y D comparado con FT2 y FT1, no así para RSA donde solo fue superior a FT1. Mediocampistas lograron un mayor rendimiento con un tamaño del efecto grande en todas las variables en comparación a las posiciones de defensa y delantero. Se observaron relaciones fuertes y muy fuertes entre todas las variables de rendimiento físico, así también para las relaciones con la CD a excepción de SJ y CMJ. Conclusión: Se deben considerar las características específicas de cada CD de los jugadores con PC en conjunto con la posición de juego y la táctica del equipo en sí misma, conjugando una serie de factores que busquen lograr los más altos niveles de rendimiento físico y deportivo. Abstract. Objective: The aims of this study were: i) Characterize the physical performance profile of cerebral palsy (CP) football players of the Chilean national team of football 7 a-Side according to the sport classification (SC) and playing position; ii) Analyze the relationship between physical performance variables and the SC. Method: 19 male football players with CP belonging to the Chilean national team of football 7 a-Side participated and were grouped according to SC (FT2; FT2; FT3) and playing position. Measurements of Agility (AG), repeated sprint ability (RSA), the covered distance in the Yo-Yo test (D), jump ability in Squat Jump (SJ), and Countermovement Jump (CMJ) test were made. Results: Significant differences were found according to SC, where FT3 players achieved higher performance in AG and D tests compared to FT2 and FT1, not for RSA, which was only higher than FT1. Midfielder achieved a higher performance with a large effect size in all variables compared with defender and forward positions. Strong and very strong relationships were observed between all the physical performance variables, as well as for relationships with SC except for SJ and CMJ. Conclusion: The specific characteristics of each SC of CP players must be considered in conjunction with the playing position and the team's tactics, combining a series of factors that seek to achieve the highest levels of physical and sports performance.

scholarly journals Relationship Between Jump Performance and Sport Ages in U16 Basketball Players

2019 ◽  
Vol 8 (2) ◽  
pp. 207
Author(s):  
Ozlem Orhan ◽  
Sezen Cimen Polat ◽  
Imdat Yarim
Keyword(s):  
Body Mass Index ◽  
Body Weight ◽  
Body Mass ◽  
The Other ◽  
Countermovement Jump ◽  
Basketball Players ◽  
Jump Performance ◽  
Squat Jump ◽  
Significant Difference ◽  
Jump Ability

This study was conducted to evaluate the jump performance of youth basketball players according to their sport ages. 26 male basketball players (14.1&plusmn;1.6 year) who participated in the study were divided into two groups of sport ages of 4 and below (&le;4) and 6 and above (&ge;6). The group with sports ages &le;4 consisted of 12 male basketball players with a height of 162&plusmn;2.56 cm, a body weight of 51.4&plusmn;3.04 kg, a body mass index of 19.4&plusmn;0.74 kg/m&sup2;. The other group with sports ages &ge;6 consisted of 14 male basketball players with a height of 155.9&plusmn;1.98 cm, a body weight of 45.7&plusmn;1.85 kg, a body mass index of 18.8&plusmn;0.69 kg/m. All basketball players&rsquo; squat jump (SJ) and countermovement jump (CMJ) were measured (Optojump Microgate Bolzano, Italy). The Mann Whitney U test was used to determine whether there were differences between groups in terms of T flighttimes and jump heights. Statistically significant level of p&lt;0.05 was accepted. As a result of the study, no statistically significant difference was observed between the sport ages and SJ and CMJ splashes. In this respect, it can be considered that the Jump performance does not develop in parallel with the training age, and that the jump ability of this cause may be more related to motor skill and ability than the training age.

Determination of Spreading Motive Levels of Elite Hearing-impaired Sportsmen

2019 ◽  
pp. 39-55
Author(s):  
Osman Kusan ◽  
Hasan Erdem Mumcu ◽  
Abdulkerim Çeviker ◽  
Ömer Zambak ◽  
Onur Öztürk
Keyword(s):  
Educational Status ◽  
Hearing Impaired ◽  
Validity And Reliability ◽  
Male Athletes ◽  
Internal Motivation ◽  
National Team ◽  
Older Athletes ◽  
Significant Difference ◽  
Level Of Significance ◽  
Age Range

This study was conducted to investigate the sub-scales of sports instructions of elite athletes with hearing impairment or hearing loss due to different reasons. A total of 173 hearing-impaired athletes constituted of 54 female and 119 male athletes who are active national team athletes in the age range of 15-25 years. The study was conducted based on Self Determination Theory of Deci and Ryan [9] and on the developed Sports Motivation Scale, Pelletier et al. [24] Kazak [18] applied the validity and reliability of the scale for Turkish athletes. Accordingly, since the p_values calculated for the inner motivation sub-scale and its sub-scales are less than the value of α = .05 which is taken as the level of significance, there is a statistically significant difference in the average scores of the hearing-impaired athletes in their internal motivations and sub-scales. According to gender and educational status, there was no difference in the motivation of the hearing-impaired athletes. According to the age variable, it was seen that older athletes had more external connections. Considering the general motivation scores, the athletes in tennis and swimming were less motivated than others. Elite hearing-impaired athletes are affected by both internal and external impulses. However, internal motivation scores are higher than the external. Internal motivation scores are seen as the lowest in the branch swimming area.

scholarly journals Isokinetic Profile of Elite Serbian Female Judoists

2021 ◽  
Vol 18 (13) ◽  
pp. 6988
Author(s):  
Wieslaw Blach ◽  
Miodrag Drapsin ◽  
Nemanja Lakicevic ◽  
Antonino Bianco ◽  
Tamara Gavrilovic ◽  
...  
Keyword(s):  
Knee Extensors ◽  
Training Experience ◽  
Lateral Asymmetry ◽  
National Team ◽  
Significant Difference ◽  
Judo Athletes ◽  
Muscle Groups ◽  
Torque Values ◽  
Training Modalities ◽  
Knee Flexors

Elite judo athletes undergo vigorous training to achieve outstanding results. In pursuit of achieving competitive success, the occurrence of injuries amongst judo athletes is not rare. The study aimed to perform a knee flexors and extensors isokinetic torque analysis in elite female judo athletes. Fifty-eight elite female judo athletes of the Serbian national team (21.02 ± 3.11 years; 62.36 ± 11.91 kg, 165.04 ± 10.24 cm, training experience 12.72 ± 2.98 years) volunteered to participate in this study. The range of motion (ROM) was set at 90⁰. Testing was performed in a concentric–concentric mode for the testing speed of 60 ⁰/s. Five maximal voluntary contractions of knee extensors and knee flexors muscle groups were measured for both legs. The obtained data showed a statistically significant difference in absolute torque values among different categories as heavier athletes demonstrated higher values. Post hoc analysis showed a significant difference between weight categories, as heavier athletes demonstrated higher values, while no significant differences in normalized torque values for different weight categories were observed. The implementation of new elements and training modalities may improve performance and prevent lateral asymmetry, thus reducing the risk of injury.

Verification of In Situ Thresholds and Integrated Real-Ear Measurements

2010 ◽  
Vol 21 (10) ◽  
pp. 663-670 ◽  
Author(s):  
Jeffrey J. DiGiovanni ◽  
Ryan M. Pratt
Keyword(s):  
Measurement System ◽  
Hearing Aids ◽  
Hearing Aid ◽  
Normal Hearing ◽  
Analysis Tool ◽  
Ohio University ◽  
Positive Direction ◽  
Significant Difference ◽  
Threshold Measurement

Background: Accurate prescriptive gain results in a more accurate fit, lower return rate in hearing aids, and increased patient satisfaction. In situ threshold measurements can be used to determine required gain. The Widex Corporation uses an in situ threshold measurement strategy, called the Sensogram. Real-ear measurements determine if prescriptive gain targets have been achieved. Starkey Laboratories introduced an integrated real-ear measurement system in their hearing aids. Purpose: To determine whether the responses obtained using the Widex Sensogram were equivalent to those obtained using current clinical threshold measurement methods. To determine the accuracy of the Starkey IREMS™ (Integrated Real Ear Measurement System) in measuring RECD (real-ear to coupler difference) values compared to a dedicated real-ear measurement system. Research Design: A verification design was employed by comparing participant data measured from standard, benchmark equipment and procedures against new techniques offered by hearing-aid manufacturers. Study Sample: A total of 20 participants participated in this study. Ten participants with sensorineural hearing loss were recruited from the Ohio University Hearing, Speech, and Language Clinic participated in the first experiment. Ten participants with normal hearing were recruited from the student population at Ohio University participated in both experiments. The normal-hearing group had thresholds of 15 dB HL or better at the octave frequencies of 250–8000 Hz. The hearing-impaired group had thresholds of varying degrees and configurations with thresholds equal to or poorer than 25 dB HL three-frequency pure-tone average. Data Collection and Analysis: The order of measurement method for both experiments was counterbalanced. In Experiment 1, thresholds obtained via the Widex Sensogram were compared to thresholds obtained for each participant using a clinical audiometer and ER-3A insert ear phones. In Experiment 2, RECD values obtained via the Starkey IREMS were compared to RECD values obtained via the Audioscan Verifit™. A repeated-measures analysis of variance (ANOVA) was used for statistical analysis, and a Fisher's LSD (least significant difference) was used as a post hoc analysis tool. Results: A significant difference between Sensogram thresholds and conventional audiometric thresholds was found with the Sensogram method resulting in better threshold values at 0.5, 1.0, and 2.0 kHz for both groups. In Experiment 2, a significant difference between RECD values obtained by the Starkey IREMS and the Audioscan Verifit system was found with significant differences in RECD values found at 0.25, 0.5, 0.75, 1.5, 2.0, and 6.0 kHz. Conclusions: The Sensogram data differ significantly from traditional audiometry at several frequencies important for speech intelligibility. Real-ear measures are still required for verification of prescribed gain, however, calling into question any claims of shortened fitting time. The Starkey IREMS does perform real-ear measurements that vary significantly from benchmark equipment. These technologies represent a positive direction in prescribing accurate gain during hearing-aid fittings, but a stand-alone system is still the preferred method for real-ear measurements in hearing-aid fittings.

Abstract 249: Stationary Signal and Flow Velocity Assessment by MRI of a New Nitinol Nanocomposite Polymer Stent-Graft

2012 ◽  
Vol 32 (suppl_1) ◽  
Author(s):  
Mital Desai ◽  
Rachel E Clough ◽  
Nicholas R Gaddum ◽  
Kawal Rhode ◽  
Xiang Zhou ◽  
...  
Keyword(s):  
Steady Flow ◽  
Stent Graft ◽  
Signal Attenuation ◽  
Stent Grafts ◽  
Mean Velocity ◽  
Nanocomposite Polymer ◽  
Significant Difference ◽  
Flow Phantom ◽  
Flow Flux ◽  
Commercial Device

Objective: To assess MRI compatibility and suitability of a new sutureless stent-graft made from Nitinol bonded to nanocomposite polymer (NP). Methods: 1. Using MRI and Magnevist contrast, isotropic 3D T1-weighted FFE images of NP stent-graft were acquired to observe artefacts and stationary signal attenuation. Average signal magnitude was calculated. Medtronic ValiantTM was used as control. 2. In second stage, steady flow phantom was setup for flow-encoded MRI signal assessment of both stent-grafts. Baseline values were obtained by velocity measurements without stent-graft using identical settings. 2D through-plane phase contrast images were acquired and average velocity and amount of flow (flux) were calculated. Results: On static assessment of NP and ValiantTM stent-grafts no significant image artefacts were seen. The signal inside and outside the ValiantTM stent-graft was 644.2(SD 36.2) and 659.6(SD 85.8) respectively. The signal attenuation for this device was 2.39%. The signal inside and outside the NP stent graft was 1561.7(SD 31.2) and 1595.5(SD 40.8) respectively with comparable signal attenuation of 2.16%. In MRI velocity attenuation study, steady flow phantom was set at mean volume of 105.3 ml and mean velocity of 79.5 cm/sec. Flux measured in ValiantTM stent-graft was 102±2.27 ml/sec with no significant difference to baseline (104±1.98 ml/sec; P=0.892). Similarly flux for NP stent-graft at mean stroke volume 104.4 ml and mean velocity of 92.3 cm/sec showed no difference to baseline (99.8±2.4 vs. 104±0.96 ml/sec; P=0.176). There was no significant difference in flux between Medtronic and NP stent-grafts (102±2.27 vs. 99.8±2.4 ml/sec; P=0.328). Conclusion: NP stent-graft does not display any material-induced artefacts on MRI. On flow assessment, signal attenuation is comparable with the commercial device. These properties are important in developing this stent-graft, compliant, durable, visco-elastic, biocompatible and anti-thrombogenic, for future clinical use.

scholarly journals Enhancement of Countermovement Jump Performance Using a Heavy Load with Velocity-Loss Repetition Control in Female Volleyball Players

2021 ◽  
Vol 18 (21) ◽  
pp. 11530
Author(s):  
Michal Krzysztofik ◽  
Rafal Kalinowski ◽  
Robert Trybulski ◽  
Aleksandra Filip-Stachnik ◽  
Petr Stastny
Keyword(s):  
Body Mass ◽  
Repeated Measures ◽  
Performance Enhancement ◽  
Countermovement Jump ◽  
Mean Power ◽  
Mean Velocity ◽  
Heavy Load ◽  
Jump Performance ◽  
Volleyball Players ◽  
Post Hoc

Although velocity control in resistance training is widely studied, its utilization in eliciting post-activation performance enhancement (PAPE) responses receives little attention. Therefore, this study aimed to evaluate the effectiveness of heavy-loaded barbell squats (BS) with velocity loss control conditioning activity (CA) on PAPE in subsequent countermovement jump (CMJ) performance. Sixteen resistance-trained female volleyball players participated in this study (age: 24 ± 5 yrs.; body mass: 63.5 ± 5.2 kg; height: 170 ± 6 cm; relative BS one-repetition maximum (1RM): 1.45 ± 0.19 kg/body mass). Each participant performed two different conditions: a set of the BS at 80% 1 RM with repetitions performed until a mean velocity loss of 10% as the CA or a control condition without CA (CNTRL). To assess changes in jump height (JH) and relative mean power output (MP), the CMJ was performed 5 min before and throughout the 10 min after the CA. The two-way analysis of variance with repeated measures showed a significant main effect of condition (p = 0.008; η2 = 0.387) and time (p < 0.0001; η2 = 0.257) for JH. The post hoc test showed a significant decrease in the 10th min in comparison to the value from baseline (p < 0.006) for the CNTRL condition. For the MP, a significant interaction (p = 0.045; η2 = 0.138) was found. The post hoc test showed a significant decrease in the 10th min in comparison to the values from baseline (p < 0.006) for the CNTRL condition. No significant differences were found between all of the time points and the baseline value for the CA condition. The CA used in the current study fails to enhance subsequent countermovement jump performance in female volleyball players. However, the individual analysis showed that 9 out of the 16 participants (56%) responded positively to the applied CA, suggesting that the PAPE effect may be individually dependent and should be carefully verified before implementation in a training program.

scholarly journals PENGARUH LATIHAN KNEE TUCK JUMP DAN LATIHAN HALF SQUAT JUMP TERHADAP KEMAMPUAN SMASH KEDENG DALAM PERMAINAN SEPAKTAKRAW

2020 ◽  
Vol 11 (3) ◽  
pp. 117
Author(s):  
Heriansyah Heriansyah ◽  
Suhartiwi Suhartiwi
Keyword(s):  
Data Analysis ◽  
Random Sampling ◽  
Male Students ◽  
Squat Jump ◽  
Significance Level ◽  
Jump Training ◽  
Analysis Technique ◽  
Significant Difference ◽  
Experiment Method ◽  
The Difference

This study aims to determine the extent of the difference in effect between knee tuck jump and half squat jump training on the ability to smash kedeng in sepaktakraw games. By using the field experiment method. The population used is male students of Southeast Sulawesi SMANKO with a sample of 60 people taken by Proposive random sampling. The data analysis technique used is the t-test at 95% significance level. The results showed that; (1) There is a significant effect of knee tuck jump training on the ability to smash kedeng in sepaktakraw games on Southeast Sulawesi SMANKO students, proven to = 13,446> tt = 2,045. There is a significant effect of half squat jump training on the ability of the Kedeng smash in sepaktakraw games on Southeast Sulawesi SMANKO students, proven to = 10.478> tt = 2.045. There is a significant difference in effect between training on the ability to smash kedeng in sepaktakraw games on Southeast Sulawesi SMANKO students, proven, to = 9,970> tt = 2,000.

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