scholarly journals The Comparison of Lower Extremity Isokinetic Strength in Volleyball Players According to the Leagues

2018 ◽  
Vol 8 (4) ◽  
pp. 111
Author(s):  
Cengiz Akarcesme ◽  
Sinem Hazir Aytar
Keyword(s):  
Lower Extremity ◽  
T Test ◽  
Isokinetic Strength ◽  
Extensor Muscles ◽  
Volleyball Players ◽  
Angular Velocities ◽  
Strength Difference ◽  
Knee Muscle

The purpose of the study is to compare the ratio of lower extremity isokinetic hamstring/quadriceps ratio (H/Q),bilateral strength difference (BLD) and relative peak torques (RPT) in volleyball players according to the leagues.101 volleyball players participated in the study (female=34, male=25 from 1st league; female=21, male=21 from 2ndleague). Isokinetic extension and flexion of knee muscle strengths of the volleyball players were determined withisokinetic dynamometer. Independent t test was used to compare volleyball players' flexor and extensor RPT, H/Qratios and BLD according to their leagues. In the study conducted, it was determined that both male and femalevolleyball players playing the 1st league had higher RPTs at 60°s-1 and 180°s-1 angular velocities. It was determinedthat volleyball players’ BLD was within the desired limits, whereas their H/Q ratios were low. As a result, it wasdetermined that the lower extremity isokinetic knee muscle RPT of the volleyball players playing in the 1st Leaguehad better values than those playing in the 2nd league, but these values were higher in the extension RPT. Since theessential requirement of volleyball is the jumping strength of the movements, this case may be related to the greaterdevelopment of the extensor muscles.

scholarly journals Effect of long-term training adaptation on isokinetic strength in college male volleyball players

2019 ◽  
Vol 23 (5) ◽  
pp. 236-241
Author(s):  
A. Kafkas ◽  
M.E. Kafkas ◽  
S. Savaş
Keyword(s):  
Resistance Training ◽  
Muscle Strength ◽  
Knee Extensor ◽  
Isokinetic Strength ◽  
Flexor Muscle ◽  
Knee Strength ◽  
Volleyball Players ◽  
Angular Velocities ◽  
Knee Muscle ◽  
Flexor Strength

Background and Study Aim: Most of this study focused on endurance, power, and anthropometric measurements but no research declared isokinetic strength changes during two years. The purpose of this study was to assess the effect of resistance exercises on two seasonal alters in isokinetic strength of knee muscles at different angular velocities, in college volleyball players. Material and Methods: Thirteen college volleyball players, (age: 21.75 years, body mass: 78.60 kg, and height: 187.0 cm) participated in the study. All college volleyball players take part in the two-year (8 month each year) volleyball-specific training and competitions. The measurement of peak isokinetic concentric knee extension and knee flexion torque in both legs were taken at 2 angular velocities of movement, low at 60° s-1, and intermediate at 180° s-1. Results: The pre- and post-test values of the peak isokinetic strength found that statistical significance difference, at 60° s-1 and 180° s-1 for knee extensor-flexor both dominant and non-dominant in favor of post-tests. Significant enhances were observed in the baseline dominant knee extensor-flexor muscle strength (extensor knee strength 60° s-1: 19.0%, 180° s-1: 20.5%, flexor knee strength, 60° s-1: 33.4%, 180° s-1: 31.4%) respectively. Non-dominant knee extensor-flexor muscle strength increased significantly over the two-year period (extensor knee strength 60° s-1: 21.3%, 180° s-1: 23.0%, flexor knee strength, 60° s-1: 37.4%, 180° s-1: 33.9%) respectively. Conclusion: As a result, our data suggests that the two-year planned program of specific volleyball and resistance training can increase the knee muscle extensor-flexor strength and H:Q ratios of volleyball players. Especially, at a 60° s-1 and 180° s-1 angular velocities, whilst the knee muscle extensor-flexor strength and H:Q ratios for dominant and non-dominant legs were increasing, also H:Q ratios disproportion were decreasing. Therefore, these alters indicated that regular specific-volleyball and resistance training can increase knee muscle extensor-flexor strength and H:Q ratios for dominant and non-dominant legs.

scholarly journals Effects of Regional Plyometric Trainings on Agility Performance of Male Volleyball Players

2021 ◽  
Vol 7 (1) ◽  
pp. 449
Author(s):  
Mahmut Alp ◽  
Mehmet Mansuoglu
Keyword(s):  
Lower Extremity ◽  
Training Programs ◽  
Training Group ◽  
T Test ◽  
Descriptive Statistics ◽  
Plyometric Training ◽  
Significance Level ◽  
Volleyball Players ◽  
Paired T Test

The study aims to investigate the regional plyometric trainings’ effects on the agility performance of male volleyball players. Süleyman Demirel University Volleyball Team with 20 players attended to the study voluntarily. Players were randomly divided into volleyball training group (VTG) (n = 10) and plyometric training group (PTG) (n = 10). As the VTG continued with their routine volleyball training; regional plyometric trainings for the lower extremity were performed to the PTG for 6 weeks, 3 days a week, at least 30 minutes a day in addition to volleyball training. T and Pro-Agility Tests were applied to the groups at the beginning and end of the 6-week period. Descriptive Statistics, Paired T-Test, and Independent T-Test were used for comparison. “p < 0.05” significance level was accepted for the results’ evaluation. Results of comparison of the T and Pro-Agility pre and post tests’ values of the groups, differences were statistically significant in PTG’s values p < 0.05), but no differences were found in VTG’ values (p > 0.05). Also, no differences were found as a result of the comparison of the pre and post T and Pro-Agility Test values between the groups (p > 0.05). Considering that plyometric trainings provide maximum contraction in the shortest time possible and its effect on the characteristics like sudden changes of location and direction in the volleyball, applying plyometric trainings may be thought to be effective in volleyball training programs.

scholarly journals Examination of Balance and Isokinetic Strength in Female Volleyball Players

2019 ◽  
Vol 8 (6) ◽  
pp. 31
Author(s):  
Elif Cengizel ◽  
Cagdas Ozgur Cengizel
Keyword(s):  
Angular Velocity ◽  
Significant Relationship ◽  
Knee Flexion ◽  
Isokinetic Strength ◽  
Balance Test ◽  
Significant Difference ◽  
Volleyball Players ◽  
Angular Velocities ◽  
The Relationship ◽  
Flexion And Extension

The purpose of this research is: (a) to compare the dominant and non-dominant leg isokinetic strength and balance, (b) to compare the balance applied on the same side to different directions and isokinetic strength applied to the same side at different angular velocities and (c) to examine the relationship between the balance and isokinetic strength applied at different angular velocities in female volleyball players. Eleven senior female volleyball players voluntarily participated in the research. Isokinetic knee flexion and extension strength were separately obtained on concentric/concentric dominant and non-dominant leg as 5 repetitions at 60˚.s-1 angular velocity, 10 repetitions at 180˚.s-1 and 15 repetitions at 300˚.s-1. The balance test was performed for both sides in anterior (ANT), posterolateral (PL) and posteromedial (PM) directions. In female volleyball players, there is no significant difference between the dominant and non-dominant leg in terms of isokinetic strength and balance. A significant difference was detected between the balance applied in different directions on the same side and isokinetic force applied at different angular velocities. However, there is not any significant relationship between isokinetic strength and balance in female volleyball players. As a result, there is no isokinetic strength and balance asymmetry in volleyball and there is no relationship between them. This may be an indication of the need for both legs in volleyball.

scholarly journals Profil izokinetickej sily extenzorov a flexorov kolena u mladých futbalových hráčov

2012 ◽  
Vol 6 (1) ◽  
pp. 53-60
Author(s):  
Tomáš Malý ◽  
František Zahálka ◽  
Lucia Malá ◽  
Jaroslav Teplan
Keyword(s):  
Angular Velocity ◽  
Research Group ◽  
Eccentric Contraction ◽  
Baseline Data ◽  
Soccer Players ◽  
Knee Extensors ◽  
Isokinetic Strength ◽  
Concentric Contraction ◽  
Angular Velocities

Th e aim of the study was to present isokinetic strength profi le of knee fl exors and extensors during concentric contraction in young soccer players. Particularly in knee fl exors was evaluated also strength during eccentric contraction. Research group was state from young soccer players U17 category (n=19, age=16,4±0,3 years). All of them are the participant of highest junior soccer league. Isokinetic strength was evaluated by isokinetic dynamometr Cybex Humac Norm in following angular velocities: 30, 60 and 120°/s in eccentric contraction and 60, 180, 240 and 300 °/s in concentric contraction. Th e results did not revealed signifi cant diff erences at three diff erent speed levels of knee fl exors’ strength during eccentric contraction (p>0,05). Regarding the concentric contraction we found signifi cant diff erences for strength production depending on angular velocity for both knee extensors and fl exors (p<0,01). Knee fl exors generated more strength during eccentric contraction compared to concentric contraction. Th e strength profi les developed in the present study can assist in the establishment of baseline data in young soccer players or for comparison values with other researchers.

Isokinetic Strength Profiles of Thigh Muscles of Modern Dancers in Relation to Their Experience Level

2013 ◽  
Vol 28 (3) ◽  
pp. 137-144
Author(s):  
Ani Agopyan ◽  
Demet Tekin ◽  
Mehmet Unal ◽  
Hizir Kurtel ◽  
Gullu Turan ◽  
...  
Keyword(s):  
Body Weight ◽  
Peak Torque ◽  
Thigh Muscle ◽  
Isokinetic Strength ◽  
Total Work ◽  
Isokinetic Dynamometer ◽  
Experience Level ◽  
Strength Tests ◽  
Angular Velocities ◽  
Modern Dancers

The aim of this study was to determine maximal voluntary peak torque (PT), PT% body weight (PT%BW), total work (TW), and hamstring/quadriceps ratio (HQR) for bilateral and unilateral thigh muscle strength during isokinetic muscle contractions in modern dancers in relation to their experience level. METHODS: Twenty-two female dancers were divided into two groups: intermediate dancers (ID, n=11) and advanced dancers (AD, n=11). Strength tests were performed using the Biodex System-III Pro Multijoint System isokinetic dynamometer to determine three joint angular velocities (60, 180, 300°/s). RESULTS: During extension, ADs exhibited higher ratios in the HQR (p=0.016) on right leg at 300°/s, IDs generated greater TW (p=0.042), and within groups, there was a significant left-to-right difference in the HQR at 300°/s for ADs (p=0.042). During flexion, within groups, the ADs exhibited significant differences between legs for both PT (p=0.026) and PT%BW (p=0.022) at 300°/s. CONCLUSION: For both groups, the average HQR in all angular velocities was not within the recommended range, which is required to prevent injuries; at the same time, unilateral muscular imbalances existed. Lower extremities of ADs exhibited asymmetric strength patterns at a certain level. Further research should be done to confirm the findings of this pilot study.

Influence of Isokinetic Knee Muscle Torque at Different Angular Velocities on Standing Posture Stability in Healthy Adults

2018 ◽  
Vol 28 (02) ◽  
pp. 129-134
Author(s):  
Sami Al-Abdulwahab ◽  
Shaji Kachanathu ◽  
Faris Alodaibi
Keyword(s):  
Postural Stability ◽  
Standing Balance ◽  
Standing Posture ◽  
Muscle Torque ◽  
Angular Velocities ◽  
H:Q Ratio ◽  
Muscle Groups ◽  
Knee Muscle ◽  
The Impact ◽  
Posture Stability

Abstract Objectives Knee muscle groups contribute to proper and safe static and dynamic standing posture stability. The impact of isokinetic knee muscle torque at various angular velocities on standing posture stability is poorly understood. We investigated the influence of isokinetic knee muscle torque at different angular velocities on standing posture stability. Design Cross-sectional study. Setting King Saud University Campus labs. Method The study population was a convenience sample of 30 healthy volunteer college students with a mean age of 20±2 years. Isokinetic concentric peak torque (PT) of knee extensor (Q) and flexor (H) muscle groups as well as the flexor to extensor (H:Q) ratio at three different angular velocities: (60, 180, and 300°/s) were measured, respectively. The postural stability was also measured in both static and dynamic components. The Pearson correlation coefficient was used to examine the association between the different isokinetic components and postural stability (both static and dynamic). Results The PT of Q and H muscle groups and the H:Q ratio at the 3 different angular velocities were significantly associated with static standing balance with eye open on a firm surface (p<0.033). Moreover, the PT of Q at 60 and 180°/s angular velocities was significantly associated with maximum and endpoint excursion components of dynamic standing balance (p<0.044). Conclusions The PT of both Q and H muscle groups at different angular velocities are associated with maintenance of standing static balance. PT of Q only is significantly associated with control of dynamic standing balance in the lower angular velocities.

scholarly journals THE ADDITION BALLISTIC STRETCHING ON KNEE TUCK JUMP EXERCISE MORE EFFECTIVE THAN KNEE TUCK JUMP EXERCISE TO INCREASE POWER OF LEG MUSCLE OF VOLLEYBALL PLAYERS MALE IN THE FACULTY OF MEDICINE UDAYANA UNIVERSITY

2018 ◽  
Vol 6 (1) ◽  
pp. 18
Author(s):  
I Made Dwi Apri Pramana ◽  
I Putu Sutha Nurmawan ◽  
I Putu Adiartha Griadhi ◽  
Ida Ayu Dewi Wiryanthini
Keyword(s):  
Muscle Power ◽  
Vertical Jump ◽  
T Test ◽  
Control Group ◽  
Explosive Power ◽  
Jump Exercise ◽  
Jump Test ◽  
Volleyball Players ◽  
Leg Muscle ◽  
Leg Muscle Power

Muscle power was defined as the combination between speed and strenght of muscle contraction and enters in the fitness components. Plyometrics exercises can be used to improve the skills of volleyball players. This study was an experimental study using research designs pre test and post test control group design. The sampling technique inthis study with a simple random sampling. The total sample of 20 person so in one group consisted of 10 person. The first group was given additional ballistic stretching on knee tuck jump exercise. The second group was given knee tuck jump exercise. Measurements of leg muscle power using vertical jump test. Normality test p > 0.05 and homogeneitytest p > 0.05. The results showed an increase in leg muscle power in first group amounted to 14.30 cm and in second group an increase of 7.70 cm. Paired samples t-test p value = 0.000 (p <0.05) in first group and p = 0.000 (p < 0.05) in second group. Test increase explosive power leg muscle after exercise in both groups using independent sample t-test obtained first group and second group where p = 0.000 (p <0.05) with an increase in the percentage of 30.95% in the first group and 16.73% in the second group. From the research done can be concluded that the addition of ballisticstretching on knee tuck jump exercise is more effective than knee tuck jump exercise in increasing explosive power leg muscle in male volleyball players Medical Faculty Of Udayana University. Keywords: muscle power, ballistic stretching, knee tuck jump, vertical jump test.

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