Objectives:
VO2max is globally considered as the gold standard to evaluate the cardiorespiratory fitness that is an essential component to judge one’s aerobic fitness level. The present study was ...aimed to enumerate the validity for application of Cooper’s 12 min run test (CRT) in predicting VO2max among Indian swimmers and volleyball players.
Materials and Methods:
Swimmers (male = 66, female = 70) and volleyball players (male = 88, female = 81) were recruited by simple random sampling from reputed clubs of Kolkata. They were segregated into study and confirmatory groups. VO2max was determined by graded incremental cycle ergometer test followed by expired gas analysis and indirect CRT method.
Results:
Predicted VO2max (PVO2max) showed significant difference with the directly measured VO2max (VO2max) in study groups of both sports. Limits of agreement between PVO2max and VO2max proved inapplicability of current CRT protocol in studied populations. Modified population specific equations were computed from significant correlation of VO2max with distance covered in Cooper run test. Application of these norms in confirmatory groups revealed insignificant difference between PVO2max and VO2max in both genders.
Conclusion:
Modified equations are validated for application of CRT in evaluating VO2max in swimmers and volleyball players of both genders of Kolkata, India.
Objective This study sought to compare the impact of core stability and trampoline training on the static and dynamic balance, along with proprioception, among female volleyball players dealing with ...chronic ankle instability. Methods TThirty-six female volleyball players experiencing chronic ankle instability were purposefully chosen and randomly split into three groups: core stability training, trampoline training, and a control group. Static and dynamic balance were assessed using the stork and Y balance tests, while proprioception was evaluated utilizing a goniometer. Following the pre-test evaluations, the core stability and trampoline training groups underwent a 6-week exercise regimen. Post this training period, further evaluations were conducted. The ANCOVA test, LSD, and paired t-tests were employed for inter-group comparisons and intra-group assessments. Results Findings suggest that both training programs significantly impacted static balance (p≤0.01), dynamic balance (p≤0.01), and ankle proprioception in dorsiflexion (p≤0.01) and plantar flexion (p≤0.01) positions. Notably, a notable difference was observed between the effects of the two training programs on posterior-medial orientation, total dynamic balance score, and proprioception in plantar flexion. However, the trampoline training program demonstrated a greater effect than the core stability program. Nevertheless, no significant difference was found between the two training groups in static balance, anterior and posterior-lateral dynamic balance, and proprioception in dorsiflexion (p>0.05). Furthermore, both training groups exhibited significant differences in the researched variables when compared to the control group (p≤0.01). Conclusion Overall, the results illustrate that incorporating core stability exercises and trampoline training enhanced static and dynamic balance, as well as deep ankle sensation, among athletes dealing with chronic ankle instability.
La presente investigación es un estudio cuasi experimental que muestra los efectos de un programa de entrenamiento de la flexibilidad de la cadena muscular posterior sobre el alcance funcional y la ...ejecución del golpe de antebrazos en un grupo de jugadores de voleibol sentado de la liga de Bogotá. Dicho programa se fundamentó en la combinación de dos técnicas de desarrollo de la flexibilidad, facilitación neuromuscular propioceptiva (FNP) y estiramiento dinámico. Se llevó a cabo durante seis semanas, para un total de 17 sesiones, cada una de 30 minutos de duración y dos sesiones para aplicar el pre test y post test. El estudio muestra significación estadística en los resultados de los test de flexibilidad, sin embargo, no se obtiene significación en los resultados del test de alcance funcional ni en la evaluación del golpe de antebrazos, aunque si se observan cambios a nivel clínico. Además de esto se encuentra una correlación de significación estadística entre el test de sit and reach y el ángulo de inclinación del tronco, medido a través de análisis de gesto por medio del software kinovea.
This meta-analysis aimed to assess the effects of plyometric jump training (PJT) on volleyball players' vertical jump height (VJH), comparing changes with those observed in a matched control group. A ...literature search in the databases of PubMed, MEDLINE, Web of Science, and SCOPUS was conducted. Only randomized-controlled trials and studies that included a pre-to-post intervention assessment of VJH were included. They involved only healthy volleyball players with no restrictions on age or sex. Data were independently extracted from the included studies by two authors. The Physiotherapy Evidence Database scale was used to assess the risk of bias, and methodological quality, of eligible studies included in the review. From 7,081 records, 14 studies were meta-analysed. A moderate Cohen's
effect size (ES = 0.82, p <0.001) was observed for VJH, with moderate heterogeneity (
= 34.4%, p = 0.09) and no publication bias (Egger's test, p = 0.59). Analyses of moderator variables revealed no significant differences for PJT program duration (≤8 vs. >8 weeks, ES = 0.79 vs. 0.87, respectively), frequency (≤2 vs. >2 sessions/week, ES = 0.83 vs. 0.78, respectively), total number of sessions (≤16 vs. >16 sessions, ES = 0.73 vs. 0.92, respectively), sex (female vs. male, ES = 1.3 vs. 0.5, respectively), age (≥19 vs. <19 years of age, ES = 0.89 vs. 0.70, respectively), and volume (>2,000 vs. <2,000 jumps, ES = 0.76 vs. 0.79, respectively). In conclusion, PJT appears to be effective in inducing improvements in volleyball players' VJH. Improvements in VJH may be achieved by both male and female volleyball players, in different age groups, with programs of relatively low volume and frequency. Though PJT seems to be safe for volleyball players, it is recommended that an individualized approach, according to player position, is adopted with some players (e.g. libero) less prepared to sustain PJT loads.
Celotno besedilo
Dostopno za:
DOBA, FSPLJ, IZUM, KILJ, NUK, OILJ, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK, VSZLJ
Our primary objective in this study was to investigate the offensive strategies employed in the attack phase of men’s volleyball, specifically focusing on side-out as stratified by the type of ...confrontation that was determined by the opponent’s team performance. We analyzed 5524 attacking actions during 22 games of the 12 teams that participated in the Volleyball Men’s Superliga (season 2021–2022). Based on their final rankings in the championship, we classified these teams into three tiers: high-performance, intermediate-performance, and low-performance. Subsequently, we examined the dynamics of these matches using Social Network Analysis. We found that the opponent teams' performance levels did not influence the game dynamics. Notably, the eigenvector values were prominently higher for Attack Zones 2 and 4, wherein the middle-blocker jumped to attack close to the setter across all networks. Thus, setters opted for traditional and low-risk strategies to minimize errors, disregarding available information about the skill level of the opposing team, making their offensive tactics predictable.
In volleyball game, vertical jump is an important component in doing spikes and blocks. One of the exercise that can be used to improve the vertical jump is plyometric depth jump exercise. This study ...aims to determine the effect of plyometric depth jump exercise toward changes in vertical jumps of volleyball player UKM Bola Voli. This study was a quasi-experimental research with time series design approach. The sample sizes were 20 students and plyometric exercise was given 12 times (1 month). The sample inclusion criteria were men on aged 18-25 who are willing to become respondent and sign informed consent. The data collected was vertical jump value of volley ball player UKM. The results showed that there was an effect of plyometric depth jump exercise with the intensity of 4 set of 12 repetitions and 5 sets of 12 repetitions with significance value of 0.017 and 0.000 (p<0.05). This study showed an increase in vertical jump value in volley ball players UKM, Hasanuddin University.
Training volume and body composition have been suggested as risk factors for jumper's knee among athletic youth, but research is lacking. The aim of this 4‐year prospective cohort study was to ...examine the relationship between training and competition load, body composition, and risk for developing jumper's knee. Participants are elite volleyball players, aged 16–18 years. Training and competition load was recorded continuously and body composition semiannually. Jumper's knee was diagnosed on a standardized clinical examination. We recruited 141 healthy students (69 males and 72 females), and 28 developed jumper's knee (22 boys and six girls). In a multivariate analyses, boys had three to four times higher risk compared with girls. Volleyball training had an odds ratio (OR) 1.72 (1.18–2.53) for every extra hour trained, and match exposure was the strongest sports‐related predictor for developing jumper's knee with an OR of 3.88 (1.80–8.40) for every extra set played per week. We did not detect any significant differences between the groups in body composition at the time of inclusion or in the change of body composition during the study period. Conclusion, male gender, a high volume of volleyball training and match exposure were risk factors for developing jumper's knee.
Introduction: Flywheel training devices have initially been used as means of astronaut conditioning in outer space during long missions. The system uses a rotating disc to store the energy during the ...concentric phase of the movement and converts it to resistance during the eccentric phase. The inertia of the flywheel offers the load of the exercise performed. Later, these devices started being used in injury rehabilitation and performance training. Objective: The objective of the study was to measure the effect of isoinertial exercises using a flywheel training device on lower limb power and stability. Also, we wanted to verify if a positive correlation can be found between force, power and stability. Methods: 15 female volleyball players were included in the study N=15. During 4 months the subjects trained twice a week using the flywheel device. Initial and final tests were performed using OptoJump, Y balance test and the device’s own measuring system. The measured parameters were average power, average force, jump height and composite reach distance index. Results: Significant improvement have been found between the initial and final results for power, force, jump height and composite reach distance index p<.01. Conclusions A flywheel isoinertial training device can be seen as a viable alternative for power and stability development for volleyball players.
In this study, we aimed to develop and psychometrically examine a self-efficacy scale for high-performance volleyball athletes. A literature review and interviews with 16 experts led to construction ...of item content. A preliminary version of the scale was then administered to 24 high-performing adult athletes, followed by administration of the scale to 300 Brazilian high-performing volleyball athletes (M age = 24.88, SD = 5.51 years; 55% male; 45% female). The definitive model contained 19 items, grouped into three factors (Self-Efficacy in the Game, Defensive Self-Efficacy in Volleyball, and Offensive Self-Efficacy in Volleyball). A Global Self-Efficacy score was evaluated through several statistical procedures that provided evidence of an adequate fit of the model to the data, and we showed internal reliability of the item content and invariance of the instrument for both sexes. These results support the instrument’s test content, internal structure, and relation to other variables, indicating that the Volleyball Self-Efficacy Scale (VSES) can now be used to assess the self-efficacy of high performing Brazilian volleyball athletes.
El presente estudio busca conocer cómo se experimenta el afrontamiento psicosocial en partidos internacionales en jugadoras de voleibol profesional de la selección peruana. Se utilizó una metodología ...cualitativa con diseño fenomenológico-hermenéutico. Se realizaron doce entrevistas semiestructuradas a jugadoras profesionales de voleibol pertenecientes a la selección femenina peruana en la categoría mayores. A partir del análisis se identificaron tres categorías, nueve subcategorías y siete códigos, que conforman las 189 unidades de análisis. Los resultados mostraron que las principales estrategias de afrontamiento utilizadas por las deportistas son el análisis lógico personal y del equipo contrario, el uso del esfuerzo, la búsqueda de apoyo profesional y las imágenes mentales. Se concluye que las jugadoras profesionales de voleibol en Perú utilizan principalmente el afrontamiento orientado a la tarea, realizando actividades que les permiten sentirse capaces y que desempeñan un papel esencial en la toma de decisiones durante las competiciones.
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