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 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 Effects of Short-Term Plyometric Training on Agility, Jump and Repeated Sprint Performance in Female Soccer Players

2021 ◽  
Vol 18 (5) ◽  
pp. 2274
Author(s):  
Marcin Maciejczyk ◽  
Renata Błyszczuk ◽  
Aleksander Drwal ◽  
Beata Nowak ◽  
Marek Strzała
Keyword(s):  
Physical Performance ◽  
Sprint Performance ◽  
Soccer Players ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Short Term ◽  
Jump Performance ◽  
Squat Jump ◽  
Repeated Sprint ◽  
Before And After

The aim of the study was to determine the effects of short-term (4 weeks, twice a week: 8 sessions) plyometric training on agility, jump, and repeated sprint performance in female soccer players. The study comprised 17 females performing this sports discipline. The players were randomly divided into two groups: with plyometric training (PLY) and the control (CON). All players followed the same training program, but the PLY group also performed plyometric exercises. Tests used to evaluate physical performance were carried out immediately before and after PLY. After implementing the short PLY training, significant improvement in jump performance (squat jump: p = 0.04, ES = 0.48, countermovement jump: p = 0.009, ES = 0.42) and agility (p = 0.003, ES = 0.7) was noted in the PLY group. In the CON group, no significant (p > 0.05) changes in physical performance were observed. In contrast, PLY did not improve repeated sprint performance (p > 0.05) among female soccer players. In our research, it was shown that PLY can also be effective when performed for only 4 weeks instead of the 6–12 weeks typically applied.

scholarly journals The Relationship Between Body Composition, Anaerobic Performance and Sprint Ability of Amputee Soccer Players

2012 ◽  
Vol 35 (1) ◽  
pp. 141-146 ◽  
Author(s):  
Ali Özkan ◽  
Gürhan Kayıhan ◽  
Yusuf Köklü ◽  
Nevin Ergun ◽  
Mitat Koz ◽  
...  
Keyword(s):  
Body Composition ◽  
Sprint Performance ◽  
The Other ◽  
Soccer Players ◽  
Anaerobic Performance ◽  
Fat Percentage ◽  
Squat Jump ◽  
Counter Movement Jump ◽  
The Relationship

The purpose of the present study was to investigate the relationship between body composition, anaerobic performance and sprint performance of amputee soccer players. Fifteen amputee soccer players participated in this study voluntarily. Subjects’ height, body weight, body mass index, body fat percentage (Jackson and Pollock formula) and somatotype characteristics (Heath-Carter system) were determined. The sprint performance at 10m, 20m and 30m was evaluated, whereas the counter movement jump (CMJ), relative CMJ (RCMJ), squat jump (SJ) and relative SJ (RSJ) tests were used for the determination of anaerobic performance. The results of the Pearson Product Moment correlation analysis indicated that body composition was significantly correlated with CMJ and SJ (p < 0.01), on the other hand, no measure of body composition was significantly related to the other component (p > 0.05). A significant correlation was found between CMJ, RCMJ, SJ, 10 m, 20 m and 30 m sprint performance (p < 0.05); whereas, in contrast, no measure of body composition was significantly related to the 10 m, 20 m and 30 m sprint performance (p > 0.05). In conclusion, the findings of the present study indicated that sprint performance was described as an essential factor in anaerobic performance whereas body composition and somatotype play a determinant role in anaerobic and sprint performance in amputee soccer players.

Effect of Hope on Resilience in Adolescents: Social Support and Social Connectedness as Mediators

2021 ◽  
Vol 5 (2) ◽  
pp. 136-147
Author(s):  
İlhan Cicek
Keyword(s):  
Social Support ◽  
High School Students ◽  
Social Connectedness ◽  
School Students ◽  
Mediating Role ◽  
Resilience Scale ◽  
Significant Difference ◽  
Study Participants ◽  
The Relationship

The purpose of this study was to investigate the mediating role of social support and social connectedness between hope and resilience in adolescents. A total of 413 high school students (57.1% girls; M= 17.31, SD= 1.61) participated in the study. Participants completed the Children’s Hope Scale (CHS), Brief Resilience Scale (BRS), Brief Perceived Social Support Questionnaire (BPSSQ), and Social Connectedness Scale (SCS). The results showed that there was a positive significant correlation between social support, resilience, social connectedness, and hope. In addition, according to the gender variable, it is seen that the resilience and hope scores of the boys are significantly higher than the girls. On the other hand, no significant difference was found in social connectedness and social support in terms of gender. The results mediation analysis showed that hope significantly and positively predicted social connectedness, social support, and resilience. Also, social connectedness positively and significantly predicted social support, and social support was a significant predictor of resilience. Most importantly, social support and social connectedness acted as mediating roles in the relationship between hope and resilience. These results suggest that social connectedness and social support are two important sources in developing resilience. This has important implications for research and practice.

Relationship of The Knee Extensor Strength But Not The Quadriceps Femoris Muscularity With Sprint Performance in Sprinters: A Reexamination and Extension

2021 ◽  
Author(s):  
Miyuki Hori ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Takahiro Tanaka ◽  
Yuki Kusagawa ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Knee Extension ◽  
Quadriceps Femoris ◽  
Sprint Performance ◽  
Sprint Time ◽  
Knee Extensor Strength ◽  
Significant Difference ◽  
The Absolute ◽  
Relationship Of ◽  
The Relationship

Abstract Purpose: This study examined the relationships of the knee extensor strength and quadriceps femoris size with sprint performance in sprinters. Methods: Fifty-eight male sprinters and 40 body size-matched male non-sprinters participated in this study. The knee extensor isometric and isokinetic strengths were measured using a dynamometer. The isokinetic strength measurements were performed with slow and fast velocities at 60°/s and 180°/s, respectively. The quadriceps femoris muscle volume (MV) was measured using magnetic resonance imaging. The relative values of the knee extensor strengths and quadriceps femoris MV were normalized to body mass.Results: The absolute and relative values of the two velocity isokinetic strengths, but not of isometric strength, of the knee extension were significantly higher in sprinters than in non-sprinters (both Ps < 0.05). Such a significant difference was also observed for the relative quadriceps femoris MV (P = 0.018). In sprinters, there were significant correlations between all three knee extensor strengths and quadriceps femoris MV (r = 0.421 to 0.531, all Ps £ 0.001). The absolute and relative strengths of the fast-velocity isokinetic knee extension correlated with personal best 100-m sprint time (r = -0.477 and -0.409, respectively, both Ps £ 0.001). By contrast, no significant correlations were observed between absolute and relative quadriceps femoris MVs and personal best 100-m sprint time. Conclusions: These findings suggest that despite the presence of the relationship between muscle strength and size, the knee extensor strength may be related to superior sprint performance in sprinters independently of the quadriceps femoris muscularity.

The Relationship Between Posterior Communicating Artery Formation and Vertebral Artery Flow Parameters

2021 ◽  
pp. 875647932110059
Author(s):  
İbrahim Önder Yeniçeri ◽  
Vedat Semai Bek ◽  
Neşat Çullu ◽  
Gülnihal Kutlu
Keyword(s):  
Vertebral Artery ◽  
Duplex Sonography ◽  
Posterior Communicating Artery ◽  
Vertebrobasilar Insufficiency ◽  
Flow Volume ◽  
Mean Velocity ◽  
Flow Parameters ◽  
Diastolic Velocity ◽  
Significant Difference ◽  
The Relationship

Objectives: It is important to know the range of normal vertebral artery (VA) flow volume. Diminished VA flow volume is associated with vertebrobasilar insufficiency. The study aim was to investigate the relationship between the posterior communicating artery (PCoA) calibration and the VA flow parameters, in patients with no underlying cerebrovascular disease, below 50 years of age. Materials and Methods: The study population consisted of 102 cases below 50 years of age. The basilar artery (BA), internal carotid artery (ICA), and the PCoA calibrations were measured with magnetic resonance angiography. The VA flow parameters (maximum systolic velocity, end-diastolic velocity, mean velocity, VA flow volume, and VA calibration) were measured with duplex sonography. Results: There was no statistically significant difference between these two imaging groups, in terms of VA Vmax, VA flow volumes, VA calibrations, and BA calibrations. However, the mean right ICA and mean left ICA calibrations were significantly higher in group 2 than group 1 ( P < .01). There was no significant correlation between mean PCoA calibration and mean Vmax, mean calibration, and the total flow volume of vertebral arteries. Conclusion: The findings indicate that the VA flow rate may be relatively maintained, regardless of PCoA measurements in this study.

Hallux Limitus and Its Relationship with the Internal Rotational Pattern of the Lower Limb

2011 ◽  
Vol 101 (6) ◽  
pp. 467-474 ◽  
Author(s):  
Guillermo Lafuente ◽  
Pedro V. Munuera ◽  
Gabriel Dominguez ◽  
Maria Reina ◽  
Blanca Lafuente
Keyword(s):  
Internal Rotation ◽  
Lower Limb ◽  
Study Groups ◽  
Control Group ◽  
Hallux Limitus ◽  
Foot Progression Angle ◽  
Diminished Capacity ◽  
Significant Difference ◽  
Study Participants ◽  
The Relationship

Background: The aims of this study were to determine whether individuals with mild hallux limitus show a diminished capacity of internal rotation of the lower limb compared with those without hallux limitus and whether individuals with mild hallux limitus show an increased foot progression angle. Methods: In 80 study participants (35 with normal feet and 45 with mild hallux limitus), the capacity of internal rotation of the lower limb (internal rotational pattern), hallux dorsiflexion, and the foot progression angle were measured. The values for internal rotational pattern and foot progression angle were compared between the two study groups, and the correlations between these variables were studied. Results: The capacity of internal rotation of the lower limb was significantly lesser in patients with mild hallux limitus (P &lt; .0001). There was no significant difference in foot progression angle between the two groups (P = .115). The Spearman correlation coefficient was 0.638 (P &lt; .0001) for the relationship between internal rotational pattern and hallux dorsiflexion. Conclusions: Patients with mild hallux limitus had a lesser capacity of internal rotation of the lower extremity than did individuals in the control group. The more limited the internal rotational pattern of the lower limb, the more limited was hallux dorsiflexion. The foot progression angle was similar in both groups. (J Am Podiatr Med Assoc 101(6): 467–474, 2011)

scholarly journals Relationship between self-reported and objectively measured manual ability varies during the first year post-stroke

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Netha Hussain ◽  
Margit Alt Murphy ◽  
Åsa Lundgren-Nilsson ◽  
Katharina S. Sunnerhagen
Keyword(s):  
Kinematic Analysis ◽  
Peak Velocity ◽  
Movement Time ◽  
First Year ◽  
Mean Velocity ◽  
Pointing Task ◽  
Objectively Measured ◽  
The University ◽  
The Relationship ◽  
Spearman’S Correlation

AbstractSelf-reported outcomes provide unique insights about an individual’s perceived manual ability after stroke. This study aimed at determining how the relationship between objective kinematic variables obtained from the target-to-target pointing task and self-reported manual ability varies during the first year in individuals after stroke. Sixty-six individuals from the Stroke Arm Longitudinal study at the University of Gothenburg (SALGOT) cohort were assessed using ABILHAND questionnaire and kinematic analysis at five timepoints between the 10th day and 12th month after stroke. Kinematic analysis was performed using a target-to-target pointing task in a virtual environment. Spearman’s correlation was used to determine the extent of correlation between ABILHAND logits and kinematic variables. The correlations varied with time within the first year after stroke. The correlations were low or very low early after stroke and became moderate to high after 6 months for objective measures of movement time and smoothness, but remained low to moderate for mean velocity and low for peak velocity. Due to this discrepancy between self-perceived and objective assessments of arm function, a combination of self-reported and objective assessments of upper limb should be used as outcome measures, especially in the acute and subacute stages after stroke.

scholarly journals The Relationship between Problem-Solving Skills and Memory Development in Preschool Children

2020 ◽  
Vol 9 (3) ◽  
pp. 43
Author(s):  
Yasemin Aydoğan ◽  
Arzu Özyürek
Keyword(s):  
Preschool Children ◽  
Problem Solving ◽  
Educational Status ◽  
School Type ◽  
Parental Age ◽  
Problem Solving Skills ◽  
Significant Difference ◽  
Scale Scores ◽  
Study Participants ◽  
The Relationship

<p>The present study aimed to investigate the correlation between problem-solving and memory skills in preschool children. The study group included 122 4-6 years olf children attending pre-school education institutions. Random sampling method was used to determine the study participants. Data were collected with Problem-Solving Skills Scale (PSSS) and Memory Scale for Children (MSC). In data analysis, Pearson's correlation coefficient was used to determine the correlation between the scale scores. The t test and one-way analysis of variance (ANOVA) were used to determine the effect of gender of the children, parental age and educational status on problem solving and memory. The study findings demonstrated that there was a significant correlation between the PSSS and MSC subscale scores, and the problem-solving skills and memories of pre-school children were not affected by gender, school type, parental age and profession, and mother's educational status. There was a difference between memory scores of the children based on the father's educational status and no significant difference was determined in problem-solving skills.</p>

Sign in / Sign up

Export Citation Format

Share Document