Young Female Volleyball Players Research Articles

The Effect of Combining Blood Flow Restriction with the Nordic Hamstring Exercise on Hamstring Strength: Randomized Controlled Trial.

(1) Background: It is a matter of curiosity what effect the blood flow restriction (BFR) method, which is usually combined with low-intensity resistance exercises, will have when used with high-intensity eccentric exercises. (2) Methods: The present study examined the effects of combining BFR with nordic hamstring exercises (NHEs) on hamstring muscle strength, bilateral deficit (BLD), and training volume. Thirty young female volleyball players, who trained three times a week, participated voluntarily in the study. These players were stratified into three groups, each comprising ten individuals: a control group (CG), an NHE group, and an NHE + BFR group. Hamstring muscle strength and BLD values were determined using an H-BORD device, while training volume was measured in terms of sets and repetitions. (3) Results: Statistical analysis revealed that there were no statistically significant differences in non-dominant and dominant leg peak torque parameters in the exercise groups (F = 2.65; p = 0.097; ηp2 = 0.17; F = 1.15; p = 0.0334; ηp2 = 0.084), while the total training volume was lower in the NHE + BFR group. (4) Conclusions: As a result, it was seen that adding the BFR method to NHE did not provide additional gains. However, due to the low training volume of BFR + NHE, it may be recommended to apply BFR together with NHE to athlete groups.

Ground reaction forces better than center of pressure differentiate postural control between young female volleyball players and untrained peers

A comprehensive explanation of the relationship between postural control and athletic performance requires compare body balance in athletes with their never training counterparts. To fill this gap in relation to volleyball, the aim of this study was to compare the balance of intermediate adolescent female players (VOL, n = 61) with inactive peers (CON, n = 57). The participants were investigated in normal quiet stance during 20 s trials on a Kistler force plate. The traditional spatial (amplitude and mean speed) and temporal (frequency and entropy) indices were computed for ground reaction forces (GRF) and center-of-pressure (COP) time-series. The spatial parameters of the both time-series did not discriminate the two groups. However, the temporal GRF parameters revealed much lower values in VOL than in CON (p < .0001). This leads to three important conclusions regarding posturography applications. First, GRF and COP provide different information regarding postural control. Second, measures based on GRF are more sensitive to changes in balance related to volleyball training and perhaps to similar training and sports activity regimens. And third, the indicators calculated based on these two time series can complement each other and thus enrich the insight into the relationship between balance and sports performance level.

Evaluation of Lower Extremity and Core Strength in Young Female and Male Volleyball Players

Volleyball is an anaerobic team sport that involves various complex movements and requires adequate body position sense. Therefore, volleyball players' most important physical characteristics are balance, agility, endurance, reaction speed, explosive strength, and quick strength. This study aimed to evaluate the relationship between core strength and functional performance of lower extremities in male and female volleyball players. A total of 19 (11 female, eight male) volleyball players aged 16-20 years (11 female, eight male) who were students of Ondokuz Mayıs University Yaşar Doğu Faculty of Sports Sciences participated in the study voluntarily. The inclusion criteria were determined as athletes with at least three years of active sports history and regular training. Height, weight, and Body Mass Index measurements were taken at the first visit. Then, shuttle test, plank test, push-up, single hop for distance (SH), triple hop for distance (TH), crossover triple hop for distance (CH), medial side triple hop for distance (MSTH), and medial rotation ( ) with hop for distance (MRH) and Y Balance Test were performed with randomized practice cards. When the push-up, sit-up, and plank tests were compared between men and women, a significant difference was found in the shuttle parameter (p 0.05). When the athletes' Single Leg Hop test parameters were evaluated, there was no significant difference, only in SH between the sides in men. At the same time, there was no significant difference only in medial rotation ( ) with hop in women (p 0.05). While there was a significant difference in triple hop for distance, crossover triple hop for distance, medial side triple hop for distance (MSTH) and medial rotation ( ) with hop between the parties in men, a statistically significant difference was found in single hop for distance, triple hop for distance, crossover triple hop for distance, medial side triple hop for distance parameters in women (p 0.05). When single-leg hop Tests LSIs were compared between male and female groups, no statistically significant difference was found in all parameters (p 0.05). When the findings of our study were examined, it was determined that although there was a significant difference in Single Leg Hop test parameters between dominant and non-dominant sides in the groups, the LSI values seen in male and female groups were between normal values, and there was no limb asymmetry. However, there was no difference between genders in LSIs, and similar results were found for men and women. In the core strength tests, while similar results were seen between genders in push-up and plank parameters, the significant difference in the shuttle test revealed that men had better core strength than women.

Relationship between Agility, Jumping and Repetitive Sprint Performance in Young Female Volleyball Players

Amaç: Bu çalışmada rekreasyonel genç kadın voleybolcular oyuncularının çeviklik, sıçrama ve tekrarlı sprint performansı arasındaki ilişkiyi incelemek amaçlanmıştır.&#x0D; Yöntem: Araştırmanın örneklemini 20 genç kadın voleybol sporcusu (yaş: 16.55 ± 1.10; boy: 163.95 ± 4.39; kilo: 54.16 ± 8.03) gönüllü olarak oluşturmaktadır. Çalışmada performans testleri olarak antropometrik ölçümler, sürat, T Testi çeviklik, karşı hareket sıçraması, skuat karşı hareket sıçraması ve tekrarlı sprint yeteneği testleri ölçülmüştür. Verilerin analizinde SPSS 26 istatistik programı kullanılmıştır.&#x0D; Bulgular: Çalışmanın bulgularına göre Kilo ile SKHS (p

Features of planning training loads of coordinating orientation in young female volleyball players aged 10-17, taking into account their age development

Background and Study Aim. In the context of youth sports development, it is imperative to emphasize the critical importance of a comprehensive understanding of coordinating orientation training in young female volleyball players. Given the significant variations in physical and neurological growth patterns within this age group, addressing the methodological nuances of tailored training programs becomes paramount. This study aims to substantiate specific methodological approaches for planning coordination training among young female volleyball players, with a keen focus on accommodating the unique intricacies of their developmental journey. Material and Methods. Participants in this study included female volleyball players aged 10 (n=25), 11 (n=20), 12 (n=30), and 13 (n=20). The second phase of the study involved the analysis of four years of observations of female volleyball players aged 14 to 17 (n=24), who were carefully selected from a large pool of young candidates. Prior to their participation, both the children and their parents were provided with detailed information about the study, and informed consent was obtained. In the study, a series of tests were utilized, including “Backward Throw to Target”, “Stepping over a gymnastics stick”, “'Running to numbered balls”, and “Backward Shuttle Run (3x10 m)”. An expert assessment was conducted, involving the participation of highly qualified specialists (n=25). Results. The study has demonstrated a substantial increase in coordination abilities among female volleyball players aged 10 to 17. A significant improvement was observed in kinesthetic differentiation abilities (2.3 times). A somewhat smaller increase was noted in their abilities to coordinate and restructure movements and spatial orientation (1.4-1.6 times). The most pronounced and statistically significant improvements were observed in the age group of 10 to 12 years. Changes in volleyball players aged from 12 to 13 and from 13 to 14 in tests assessing the development of spatial orientation and coordination of movements were less apparent. Motor coordination indicators improved significantly in the age group of 14 to 16. Conclusions. The identification of age-related characteristics in the development of coordination abilities is crucial for implementing the principle of aligning biological development with pedagogical and training methods. Understanding the various ontogenetic stages is essential for effectively managing the long-term athletic development of young female volleyball players.

Kadın Voleybolcularda Farklı Isınma Protokollerinin Sprint Performansına Akut Etkisinin İncelenmesi

The number of studies on warm-up protocols has increased in recent years. However, there are very few studies that are specific to the population of female athletes and consist of a large number of participants. This study was designed to investigate the effects of 3 different warm-up protocols on sprinting performance in young female volleyball players. A total of 62 licensed female volleyball players aged 13-17 years participated voluntarily. There were 3 sessions in the study. The participants were randomly divided into a warm-up group (GWG), a dynamic stretch group (DSG) and a static stretch group (SSG). After completing the warm-up protocols, the groups underwent a 5-minute transition period. The 20-metre sprint performance test was then performed. Data analysis was performed with the Python programming language and IBM SPSS 26 software. Shapiro-Wilk and Kolmogorov-Smirnov tests and kurtosis and skewness checks were performed. The data were indicated to be normally distributed (p&gt; 0,05). Repeated Measures Anova test was used to detect the differences and the significance level was chosen as α=0,05. When the results were examined, it was found that there was no statistically significant difference between the GWG and SSG 20 meter sprint time values (p&gt;0,05), whereas when the DSG and GWG and SSG 20 metre sprint time values were compared, it was found that the DSG group's sprint time improved statistically significantly (p

Effect of integrative neuromuscular training and detraining on performance indices in young female volleyball players.

Aim of this study was to determine the effect of: 1) integrative neuromuscular training (INT); and 2) detraining on power and skill performance indices in young female volleyball players. Sixty-one pre- and early pubescent female volleyball players participated in this study divided into two groups, integrative neuromuscular training (INTG) and control (CG). The INTG followed a 12-week INT program twice weekly and both groups participated in volleyball training sessions. During 8-week detraining, both groups keep practicing volleyball. Participants were assessed on upper and lower limb power and skill accuracy tests prior, at the end and 8 weeks after INT. A repeated measures Analysis of Variance was used to examine groups' changes in performance for each variable and significance level was set at P<0.05. INTG improved all power parameters more than CG after 12 weeks of INT (significant interaction, P<0.001) whilst the CG improved only countermovement jump (CMJ) height (P<0.05) and medicine ball (MB) throw (P<0.05). Both groups improved their technical skills accuracy (P<0.001) with INTG presenting higher improvements (P<0.001). During detraining, INTG maintained performance gains in CMJ and Cod (P<0.001). MB throw distance and technical skills accuracy kept on improving for both groups (P<0.01) with higher improvements observed in INTG (P<0.001). INT may cause improvements in specific power and skill performance indices during in season training in young female volleyball players which may be maintained or even improved for at least 8-week detraining when players remain active through volleyball training.

Use of exercises with increased coordination complexity in the training process of young female volleyball players aged 13-14 years

Background and Study Aim. In the context of training young female volleyball players, understanding the criteria, extent, and impact of exercises with heightened coordination complexity becomes crucial. This study aims to determine the evaluation criteria, scope, and effects of incorporating exercises with elevated coordination demands on the specific athletic readiness of young female volleyball players aged 13–14 years. Material and Methods. The study involved female volleyball players aged 13–14 years (n=24) with an average of 4 years of professional experience. Participants were divided into a control group (n=12) and an experimental group (n=12). Prior to the study, both children and their parents were thoroughly informed about the research procedures, and parental consent was obtained for participation. The coordination exercises were categorized into five groups, each assigned a complexity rating from 1 to 5. The assessment utilized a battery of tests. Results. The findings reveal that coordination training yielded a more pronounced advancement in the development of various coordination abilities among female volleyball players in the experimental group, as compared to those in the control group. A statistically significant enhancement (p&lt;0.05) was evident across all indices of coordination readiness within the experimental group. In contrast, the control group demonstrated notable progress only in 3 out of 10 instances (p&lt;0.05). In the control group, noteworthy increases (p&lt;0.05) were observed in spatial orientation, motor activity restructuring, and response indicators. Female volleyball players in the experimental group exhibited substantial improvement (p&lt;0.05–0.001) across all indicators of technical readiness, including reception, attack hit, serve, and ball pass. Conversely, the control group players showed comparatively less remarkable changes in this aspect of readiness, with significant enhancement (p&lt;0.05) identified in three parameters. Conclusions. The strategic incorporation of exercises with progressively heightened coordination demands emerges as a valuable approach in substantially enhancing the range of coordination abilities among young female volleyball players. Recognizing this factor provides the means to expedite and optimize the mastery of motor skills more effectively.

Effect of Beetroot Juice Supplementation on Muscle Soreness and Performance Recovery after Exercise-Induced Muscle Damage in Female Volleyball Players.

Beetroot juice (BRJ) contains various bioactive compounds suggested to be effective in improving athlete recovery. However, the number of studies evaluating the effects of BRJ on recovery and muscle soreness (MS) indicators in female athletes is limited. Therefore, the present study aimed to determine the effects of BRJ consumption on the performance recovery indicators and MS after exercise-induced muscle damage (EIMD) in female volleyball players. Twelve young female volleyball players were evaluated in this study. We utilized a randomized, cross-over, and double-blind design during two phases with a 30-day interval (wash-out). During each phase, EIMD was performed first, followed by BRJ or placebo (PLA) supplementation for two days (eight servings of 50 mL). Recovery monitoring of performance indicators and MS was performed after EIMD. The results of wall-sit, V sit and reach (VSFT), vertical jump height (VJH), pressure pain threshold (PPT), and thigh swelling (Sw-T) tests were recorded 48 h after EIMD. Also, the Perceived Muscle Soreness was recorded using the visual analog scale (VAS) 12 (MS-12 h), 24 (MS-24 h), and 48 (MS-48 h) hours after EIMD. The data were analyzed using two-way repeated measures of ANOVA at p < 0.05. Compared to PLA, BRJ supplementation improves wall-sit performance after EIMD (p < 0.05), while reducing Sw-T and perceived muscle soreness (p < 0.05). However, no significant difference was observed between PLA and BRJ in VJH and VSFT performance after EIMD (p > 0.05). Our findings indicate that the consumption of BRJ in female volleyball players can be useful for improving some recovery indicators, such as muscle endurance, perceived muscle soreness, and tissue edema, after EIMD.

Vertical Jump Kinetic Parameters on Sand and Rigid Surfaces in Young Female Volleyball Players with a Combined Background in Indoor and Beach Volleyball.

Little is known about the differences in vertical jump biomechanics executed on rigid (RJS) and sand (SJS) surfaces in female indoor and beach volleyball players. Eleven young female beach volleyball players with a combined indoor and beach volleyball sport background performed squat jumps, countermovement jumps with and without an arm swing, and drop jumps from 40 cm on a RJS (force plate) and SJS (sand pit attached to the force plate). The results of the 2 (surface) × 4 (vertical jump test) repeated-measure ANOVA revealed a significant (p < 0.05) main effect of the surface and the vertical jump test on the jump height and time to achieve peak vertical body center of mass velocity. A significant (p < 0.05) main effect of the test, but not of the surface (p > 0.05), was observed for the other examined biomechanical parameters. The only significant (p < 0.05) jump height gain difference between RJS and SJS was observed for the utilization of the stretch-shortening cycle, which was higher in SJS (15.4%) compared to RJS (7.5%). In conclusion, as the testing was conducted during the beach volleyball competitive season, the examined female players showed adaptations relating the effective utilization of the pre-stretch and enhanced stability during the execution of the vertical jump tests on a SJS compared to RJS.

New Specific Kinesthetic Differentiation Tests for Female Volleyball Players: Reliability, Discriminative Ability, and Usefulness.

This study aimed to determine the test-retest reliability and discriminative ability of five sport-specific kinesthetic differentiation ability tests in female volleyball players. The sample of participants consisted of 98 female volleyball players aged 15.20 ± 1 years from six clubs in Bosnia and Herzegovina. Kinesthetic differentiation ability was determined by the overhead passing test, forearm passing test, float service with a net test, float service without a net test, and float service 6 m from the net test. To estimate test-retest reliability, a sub-sample of 13 players performed all tests on two testing occasions. Furthermore, the discriminative ability of the tests was determined by analyzing the performance between players of different playing positions and situational performances. Parameters of the intraclass correlation coefficient (ICC) were excellent (0.87-0.78) in all tests except for the float service with the net test, whose reliability was good (0.66). For the absolute reliability estimates, the SEM was higher than SWC (0.2) for all variables except the float service 6 m from the net test, and the SEM was lower than SWC (0.6, 1.2). One-way ANOVA detected no statistically significant inter-positional differences in all five tests (p > 0.05). A significant difference was found between less and more successful players (p < 0.01) for all applied tests. The results of this study show that a specific battery test is a reliable and valid measure and can be used to monitor kinesthetic differentiation ability in young female volleyball players.

Is there any weakness in sports performance in volleyball athletes regarding the correlation between foot posture index and lower limb functional hopping performance?

Objective: The aim of the study was to investigate the relationship between 1RM calf raise, countermovement jump (CMJ), and functional hop performance with foot posture index (FPI). Methods: Twenty-six volleyball athletes were evaluated in this study. Foot posture index was evaluated with six-item criteria; talar head palpation, curves above and below the malleoli, calcaneus inversion/eversion, talonavicular congruence, medial longitudinal arch high, and forefoot abduction/adduction. Single hop, triple hop, crossover hop for distances, medial side triple hop, 90° medial rotation hop, single-leg vertical jump, 6m. timed hop, 1RM calf raise, and CMJ were measured in this study.Results: All measurements were tested on both right and left side. Significant differences were found in single hop (p = 0.016), triple hop (p = 0.005), medial side triple hop (p = 0.001), medial rotation hop (p = 0.020) in single leg vertical jump, and FPI for right and left sides (p &lt; 0.001, p &lt; 0.005). There were significant differences when comparing the limb symmetry indexes (LSI%) calculated from hop tests. When the correlations between FPI and hop tests were found significant, correlation and no significant correlations were found between left side and FPI. Conclusion: This study has shown that young female volleyball players may produce low hop performances due to the asymmetric structure relationship FPI scores. Level of Evidence IV; Therapeutics Studies; Cases Series.

THE EFFECT OF 14 WEEKS STRENGTH AND SERVING EXERCISE WITH YOUNG FEMALE VOLLEYBALL PLAYERS ON TENNIS SERVING

This study aims to determine the effects of strength and serving practices on serving skills performed by volleyball players who practice volleyball regularly. 30 female athletes with an average age of 16.30±0.8 years control group (CG) and 16.44±0.1 years experimental group (EG), who have been participating in volleyball practices on a regular basis for at least five years (90 min/day, three days/week), volunteered for this study. All players were randomly divided into two groups: the EG (n=15) and the CG (n=15). The participants continued attending their regular practices three times a week for 14 weeks, involving technical-tactical training and speed and agility practices required to succeed in volleyball. In addition to these practices, the EG also performed extra serving practices for another hour once a week and participated in strength workout training programs aiming to improve their upper and lower extremities on another day. At the beginning of this study, these players' anthropometric characteristics and ability to get the serve over the net and to serve to a target were noted before and after this 14-week program. When the physical characteristics of these groups were compared, no statistically significant differences were found (p&amp;gt;0.05). However, when the players' ability to get the serve over the net and to serve to a target were compared, statistically significant differences were found between these two groups (p&amp;gt;0.05). Finally, it was concluded that strength and serving practices, in addition to technical practices, which play a crucial role in improving performance and skills in volleyball, improved the serving skills of young female volleyball players; thus, giving extra programs to improve serving skills was found essential.&lt;p&gt; &lt;/p&gt;&lt;p&gt;&lt;strong&gt; Article visualizations:&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;&lt;img src="/-counters-/soc/0095/a.php" alt="Hit counter" /&gt;&lt;/p&gt;

Changes in Body Composition and Motor Fitness of Young Female Volleyball Players in an Annual Training Cycle.

Modern volleyball requires a high level of motor preparation, specific body build and optimal body composition. The aim of this study was to determine changes in body build, body composition and motor skills in young volleyball female players during an annual training cycle. The research group was comprised of 36 female athletes aged 14-16 years, who were monitored throughout a whole season using a longitudinal study design. Body composition was estimated by bioelectrical impedance analysis. Motor fitness was assessed with the following tests: vertical jumping tests (based on one-handed and two-handed reach, standing vertical jump and running vertical jump), standing long jump and 2 kg medicine ball throw. Measurements were carried out at the beginning of the preparatory period, after its completion, in the middle of the start period, at the end of the start period and during transition periods. The study showed significant changes in body composition and motor fitness level during the annual training cycle. These changes differ in subsequent periods of the macrocycle. The most pronounced changes occurred after the preparatory period and concerned increases in fat-free mass, total water content and cell mass. A significant reduction in fat content was also noted at this point. Systematic monitoring of morpho-functional changes in young female volleyball players over extended periods provides them a chance to maintain their optimal fitness level.

External focus of attention enhances arm velocities during volleyball spike in young female players.

The aim of this study was to investigate the effect of different volleyball-specific attentional focus instructions on arm velocities of a volleyball spike in young female volleyball players using the Statistical Parametric Mapping method. Twelve young female volleyball players (13.6 ± 0.6 years old, 1.8 ± 0.8 years of experience in volleyball training) were asked to perform a volleyball spike in a standing position in three different attentional focus conditions including internal focus (IF, i.e., pull back your elbow prior to transfer momentum), external focus, (EF, i.e., imagine cracking a whip to transfer momentum), and control (CON, i.e., no-focus instruction). A Qualisys 3D motion capture-system was used to track reflective markers attached to the arm, forearm, and hand. Consequently, four phases of the volleyball spike including wind-up, cocking, acceleration, and follow-through were analyzed. A one-way repeated-measure ANOVA using one-dimensional statistical parametric mapping (SPM1d) showed that players achieved greater velocities in the hand (p < 0.01), forearm (p < 0.01), and arm (p < 0.01) using the EF instructions from the start of the wind-up phase to the acceleration phase. Post-hoc (SPM1d-t-tests-paired) analyses indicated significantly greater arm, forearm, and hand velocities during the EF condition, compared to CON (p < 0.01, p < 0.01, and p < 0.01 respectively) and IF (p < 0.01, p < 0.01, and p < 0.01 respectively) conditions. These findings suggest that EF instructions had an immediate impact on increasing volleyball spike velocity from the start of the wind-up phase to the acceleration phase prior to ball contact.

Anthropometric characteristic and body composition of female students involved in volleyball training

There have been only few studies investigating the anthropometric characteristics of female vol­leyball players. These studies have revealed a positive influence of volleyball training on the physical devel­opment and fitness level among girls and women. The aim of the study was to assess the anthropometric profile of young female volleyball players. Our sample consisted of twelve female volleyball players aged between 18-21 years with at least 5 years of training experience. The body height and mass, the thickness of skinfolds, longitudinal dimensions of the body, girth and breadths were measured. The body composition was determined using anthropometric and bioimpedance methods. Somatotype was determined according to the calculating method of J. E. L. Carter. The body height of the volleyball players was estimated as high, and the body mass – higher than aver­age. Middle shoulders, narrow pelvis and prevailing of longitudinal dimensions were the most distinctive features of the body proportions of the female volleyball players. Although their thorax was narrow, the res­piratory muscles were well developed. The male type of proportions was typical for players exhibiting a thei­noid scheme (middle shoulders, long legs) according to V.V. Bunak. Our data showed high development of the muscular component of the body of volleyball players, comparable to females professionally involved in sport . Index of muscle development, based on the excursion of the shoulder muscles, was typical for female athletes – 9,92 ± 2,98 cm. We also found that the relative mass of the fat component was within the normal range for elite volleyball players. The central somatotype was found to be typical for the female volleyball players: endomorphy – 3,98 ± 0,58, mesomorphy – 3,38 ± 1,01, and ectomorphy – 3,67 ± 0,76. The obtained results describe the morphological profile of female volleyball players and can be used for the monitoring of their fitness level.

FEATURES OF RHEOVASOGRAPHIC PARAMETERS OF THE TIBIA IN VOLLEYBALL PLAYERS OF A HIGH LEVEL OF SKILL OF THE YOUTH AGE.

Aim of the work was to determine the peculiarities of rheographic parameters of the tibia in volleyball players of the general group and individual somatotypes. Materials and Methods: A comprehensive examination of 108 highly skilled volleyball players and 130 practically healthy girls aged between 16 and 20 years who did not play sports was conducted. The rheovasographic parameters of the tibia were determined using tetrapolar reocardiography on a computer diagnostic complex with the assessment of amplitude, time, and indicators of the ratio of amplitude and time rheovasographic parameters. A somatotypological study was conducted based on a calculated modification of the Heath-Carter method (1990) with the division of volleyball players and non-athletes into 4 constitutional groups: mesomorphic, ectomorphic, ecto-mesomorphic, and intermediate type. Results: Significant differences in the value of individual amplitude and most tibia rheovasographic parameters between volleyball players and girls of the control group were revealed. In athletes, the amplitudes of the systolic, diastolic and rapid blood filling, the duration of the rheographic wave, the time of the ascending and descending parts of the rheogram and slow blood filling were statistically significantly higher. Somatotypological features of peripheral hemodynamic indicators were determined in volleyball players; the greatest differences in the indicators of regional blood circulation on the tibia were recorded for representatives of the ectomorphic somatotype; between volleyball players and non-athletes with ecto-mesomorphic somatotype, there was no significant difference in the value of all tibia rheovasographic parameters. Conclusion: Systematic training and competitions lead to prominent changes in rheovasographic indicators of the tibia in young female volleyball players, which are manifested by a better state of capillary and venous blood filling of the tibia muscles, but at the same time a reduced speed of regional blood flow due to a reduced tone of the vascular wall of small and medium arteries.

TREINAMENTO DE FORÇA DO CENTRO ABDOMINAL EM JOGADORAS DE VOLEIBOL

ABSTRACT Introduction: The performance of female volleyball players depends heavily on the stability of the abdominal center. This stabilization system provides the players with a stable performance during exercises. Abdominal core strength training can also improve the efficiency and accuracy of body movements, although its studies in volleyball players lack evidence. Objective: Examine the effect of abdominal core strength training on physical fitness in female volleyball players. Methods: Eighteen female volleyball players were randomly selected and divided into two groups. The experimental group performed abdominal core strength exercises. The control group practiced regular physical exercises. The experiment lasted 12 weeks. The article addressed eight primary test items. Among them, the waist extension test and the adapted bridge test were the main indicators of the center of gravity stability. The experiment's results were analyzed by comparing the data before and after the intervention by mathematical and statistical methods. Results: The experimental group improved significantly in all aspects after 12 weeks of abdominal core strength training (P&lt;0.05). The experimental group's results were significantly improved (P&lt;0.05). Conclusion: Abdominal core strength training promotes the development of stability, coordination, and agility in young female volleyball players. The exercises explored to strengthen the abdominal center are indicated for women's volleyball teams. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

The Effect of Core Training on Agility, Explosive Strength and Balance in Young Female Volleyball Players

The present study aimed to determine the effect of core training on agility, explosive strength and balance in young female volleyball players. 20 young female volleyball players volunteered to participate in the study. Vertical jump, counter movement jump, pro-agility and dynamic balance tests were applied to all volleyball players before and after the core-training program. The athletes were selected randomly and divided into two groups as study group (n=10) and control group (n=10). The study group performed core exercises added to the beginning of the training sessions for 8 weeks (3days/week) in addition to volleyball training. The control group, on the other hand, continued volleyball training alone. At the end of 8 weeks, the tests applied in the pre-test were repeated and analyzed for all participants in order to determine the effect of core training on agility, explosive strength and balance parameters. In the statistical analysis of the study, Kurtosis-Skewness test was used to determine the normal distribution of the data. Mixed Anova and two-independent independent-samples t-test were used to make in-group and between-group comparisons. During the study, the level of significance was accepted as 0.05. A statistically significant difference was found in the balance precision index, static vertical jump (cm), counter movement jump (cm) and pro-agility agility test (sec) parameters when comparing the study and control groups. As a result, core exercises performed in addition to volleyball training appear to have a positive effect on agility, explosive strength and balance performances.

Investigation of the Effects of 8-Week Selected Pliometric Training Program on Vertical Jump and Agility in Female Volleyball Players

Purpose: The aim of this study was to investigate the effects of pliometric training on vertical jump and agility in young female volleyball players. Methods: Normal training was applied to the groups and pliometric study protocol was applied to the training program of the training group for 8 weeks. Pre-test and post-test were applied before and after the program. SPSS 25.0 program was used in the analyzes. Descriptive statistics were expressed as frequency (n), average (Mean), standard deviation (SS), minimum (Min) and maximum (Max) values. Independent samples t test was used for comparison of two groups and paired sample t test was used for intragroup comparisons. Statistical significance was evaluated at p &lt;0.05. Results: In the analyzes, A total of 50 female athletes, 25 of whom were in experimental and 25 of which were in the control group, participated in the study. The mean age of the training group was 14,56 ± 1,45 years, body weight was 55,79 ± 7,93 kg and height was 165,6 ± 7,26 cm. The mean age of the control group was 14,88 ± 1,86 years, body weight was 54,4 ± 9,82 kg and height was 164,56 ± 6,59 cm. Pliometric training applications have significant contributions to BF percentage, anaerobic capacity, (p&lt;0,05), vertical jump, leg strength, long jump, hegzagonal test, 505 agility test, Illinois agility test, and back strength (p&lt;0,001) level of significance. Conclusions: It was concluded that it will contribute to strength development by decreasing the intensity in sports branches and middle school Physical Education classes which require strength and agility, especially in volleyball and in many branches in training programs and through game training and pliometric exercises. Keywords: Development, Pliometric Training, Training, Volleyball.