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López-Serrano C, Zakynthinaki M, Mon-López D, Molina Martín JJ. Contextualizing Evaluation of Performance in Volleyball: Introducing Contextual Individual Contribution Coefficients to Assess Technical Actions. Percept Mot Skills 2023; 130:2663-2684. [PMID: 37927053 DOI: 10.1177/00315125231212592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
In this study, we proposed novel metrics for evaluating volleyball technical performance in relation to the action context. To assess each player's relative participation, we also introduced relative contextual coefficients. We analyzed 20 games played by the world's top eight teams during the 2019 FIVB Women's Club World Championship, using Data Volley software and Python programming. We evaluated inter- and intra-observer reliability and used binomial logistic regression models to estimate each variable's probability of having contributed to the team's set win. We calculated estimated confidence intervals, standard errors, and Wald values; and we employed Akaike's and Bayesian criteria to evaluate the model's goodness of fit. We identified optimal cut-off points using receiver operating characteristic curves, and we found that the proposed contextual evaluation coefficients prevented overestimation of a player's technical performance in uneven situations. We addressed the issue in which the winning team may be the one that scored the fewest points, and we were able to predict a team's victory with confidence. The proposed coefficients made multiple technical and contextual aspects of the game easily accessible and comprehensible, offering significant beneficial implications for coaches and players.
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Affiliation(s)
- Carlos López-Serrano
- Department of Sports, Faculty of Sciences of Physical Activity and Sport (INEF), Technical University of Madrid, Madrid, Spain
| | - María Zakynthinaki
- School of Chemical and Environmental Engineering, Technical University of Crete, Akrotiri, Chania, Greece
| | - Daniel Mon-López
- Department of Sports, Faculty of Sciences of Physical Activity and Sport (INEF), Technical University of Madrid, Madrid, Spain
| | - Juan José Molina Martín
- Department of Sports, Faculty of Sciences of Physical Activity and Sport (INEF), Technical University of Madrid, Madrid, Spain
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Dell'Antonio E, Hubert M, Lopes CMDS, Ruschel C, Roesler H. Effect of land- and aquatic-based plyometrics on spike and block reaches in young volleyball players: a pilot study. MOTRIZ: REVISTA DE EDUCACAO FISICA 2023. [DOI: 10.1590/s1980-657420230008521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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Trajković N, Pajek M, Sporiš G, Petrinović L, Bogataj Š. Reducing Aggression and Improving Physical Fitness in Adolescents Through an After-School Volleyball Program. Front Psychol 2020; 11:2081. [PMID: 32903452 PMCID: PMC7435016 DOI: 10.3389/fpsyg.2020.02081] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 07/28/2020] [Indexed: 11/20/2022] Open
Abstract
This study aimed to determine the effects of an after-school volleyball program on aggression and physical fitness in 14–16 years old students. One hundred and seven participants were randomized to a small-sided volleyball (SSV) training group or a control group (CON). The SSV group completed 8 months of small-sided volleyball training twice a week after school in addition to the regular physical education classes. Yo-Yo Intermittent Recovery Level 1 test (YYIRT1), medicine ball throw (MED), vertical jump (VJ), and Buss and Perry’s aggression questionnaire were evaluated before and after 8 months of training. Results revealed a significant interaction effect (group × time) in total sample for physical aggression [F(1, 105) = 17.688; p < 0.001], verbal aggression [F(1, 105) = 4.973; p = 0.028], anger [F(1, 105) = 7.662; p = 0.007], medicine ball throw [F(1, 105) = 36.143; p < 0.001], and YYIRT1 [F(1, 105) = 12.508; p = 0.001]. After-school small-sided volleyball for adolescents was accompanied by a significant decrease in aggression compared to physical education classes only. Additionally, adolescents from SSV group showed better results in physical fitness compared to the control group. Our findings significantly contribute to the understanding of possible mechanisms for reducing adolescents’ aggression, which include enjoyment, motivation, and self-control through sport intervention.
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Affiliation(s)
- Nebojša Trajković
- Faculty of Sport and Physical Education, University of Novi Sad, Novi Sad, Serbia
| | - Maja Pajek
- Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia
| | - Goran Sporiš
- Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia
| | | | - Špela Bogataj
- Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia.,Department of Nephrology, University Medical Centre, Ljubljana, Slovenia
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Anthropometric and Motor Performance Variables Are Decisive Factors for The Selection of Junior National Female Volleyball Players. J Hum Kinet 2019; 67:163-173. [PMID: 31523315 PMCID: PMC6714358 DOI: 10.2478/hukin-2019-0012] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This study examined whether anthropometric and fitness tests might successfully predict selection of young female volleyball players for a junior national team. Sixty four female players (age: 14.4 ± 0.5 y, body height: 1.76 ± 0.05 m, body mass: 63.9 ± 6.4 kg) underwent a selection procedure for the junior national team. Anthropometric data and speed and power test results were obtained and players were graded for their performance in a volleyball tournament. Selected players differed from the non-qualified in body height (3.4%; p = 0.001), standing reach height (2.6%; p = 0.001), the sum of skinfolds (15.4%; p = 0.035), body mass index (BMI; 7.1%; p = 0.005) and spike jump and reach (SJR) (2.5%; p = 0.001). Selected players were classified in the 99.2 ± 1.6 percentile in body height and in the 51.4 ± 20.6 percentile in the BMI, which were significantly different from those of the non-qualified players (95.4 ± 7.0 and 66.7 ± 18.6, p = 0.02 and p = 0.004, respectively). Stepwise discriminant analysis yielded a discriminant function (p < 0.001, η2 = 0.78) that was highly loaded by height, SJR and the BMI (r = 0.79, r = 0.74 and r = -0.53, respectively). Cross validation results showed that selection was correctly predicted in 15 out of the 20 selected players (predictive accuracy: 75.0%) and in 35 out of the 44 non-qualified players (predictive accuracy: 79.5%). In conclusion, body height, the BMI and SJR height successfully discriminated between selected and non-qualified elite young female junior national team volleyball players. The equal vertical jump, sprint and agility of selected and non-qualified players, highlight the importance of body height and the BMI for selection of elite junior female volleyball players.
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Silva AF, Clemente FM, Lima R, Nikolaidis PT, Rosemann T, Knechtle B. The Effect of Plyometric Training in Volleyball Players: A Systematic Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E2960. [PMID: 31426481 PMCID: PMC6720263 DOI: 10.3390/ijerph16162960] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/02/2019] [Accepted: 08/15/2019] [Indexed: 11/16/2022]
Abstract
Volleyball is considered a very explosive and fast-paced sport in which plyometric training is widely used. Our purpose was to review the effects of plyometric training on volleyball players' performance. A systematic search was conducted according to the preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines using PubMed, SciELO, SPORTDiscus, Medline, Scopus, Academic Search Complete, CINAHL and Web Science for articles published no later than December 2018. Any criteria were imposed for the included sample. The search focus was on interventional studies in which athletes underwent a plyometric program. To the 1831 articles found, another five were added, identified through other sources. Duplicated files were removed, titles and abstracts were screened, which left 21 remaining studies for extensive analysis. Results showed that the vertical jump (15 studies) was the major ability studied in plyometric training interventions, followed by strength (four studies), horizontal jump (four studies), flexibility (four studies) and agility/speed (three studies). In addition, it was observed that young (under 18 years old) female athletes were the most studied. The included studies indicated that plyometric training seems to increase vertical jump performance, strength, horizontal jump performance, flexibility and agility/speed in volleyball players. However, more studies are needed to better understand the benefits of plyometric training in volleyball players' performance.
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Affiliation(s)
- Ana Filipa Silva
- Polytechnic Institute of Viana do Castelo, School of Sport and Leisure, 4960-320 Melgaço and Research Nucleos of Polytechnic Institute of Maia (N2i), 4475-690 Maia, Portugal
| | - Filipe Manuel Clemente
- Polytechnic Institute of Viana do Castelo, School of Sport and Leisure, Melgaço and Instituto de Telecomunicações, Delegação da Covilhã, 6200-001 Covilhã, Portugal
| | - Ricardo Lima
- Polytechnic Institute of Viana do Castelo, School of Sport and Leisure, Melgaço, CIDESD-The Research Center in Sports Sciences, Health Sciences and Human Development, 4960-320 Melgaço, Portugal
| | | | - Thomas Rosemann
- Institute of Primary Care, University of Zurich, Zurich 8091, Switzerland
| | - Beat Knechtle
- Medbase St. Gallen Am Vadianplatz, St. Gallen 9001, Switzerland.
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Whitehead PN, Conners RT, Shimizu TS. The Effect of In-Season Demands on Lower-Body Power and Fatigue in Male Collegiate Hockey Players. J Strength Cond Res 2019; 33:1035-1042. [PMID: 30908458 DOI: 10.1519/jsc.0000000000003090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Whitehead, PN, Conners, RT, and Shimizu, TS. The effect of in-season demands on lower-body power and fatigue in male collegiate hockey players. J Strength Cond Res 33(4): 1035-1042, 2019-The purpose of this study was to determine the effect of in-season demands, such as games, travel, and the subsequent fatigue related to these demands, on lower-body power (LBP) in collegiate hockey players. Two jump protocols (countermovement and squat jumps) were used to calculate LBP. Twenty-seven NCAA (National Collegiate Athletic Association) Division I male hockey players (age, 21.9 ± 1.4 years; height, 176.7 ± 6.5 cm; body mass, 81.4 ± 7.9 kg) participated in the study that spanned 18 weekly sessions. At each session, participants completed an 8-item fatigue questionnaire, which provided a cumulative numerical value for fatigue (total score of fatigue [TSF]), before performing maximal jumps on a contact mat. General linear modeling was conducted to compare dependent variables (jump height, relative LBP, TSF) across weekly sessions. Pearson product-moment correlation coefficients were calculated to examine the relationship between jump height and LBP across the jump protocols, as well as to examine the relationship of TSF with all measured variables. Jump height and LBP declined throughout the season with greater effect of travel observed following the longest travel sequence (p ≤ 0.05; η ≥ 0.60). Differences in TSF were observed from baseline (p ≤ 0.037), and a large effect was seen for away trips that included air travel (d ≥ 1.35). Total score of fatigue had a negative correlation with jump height and power during both jumps (r ≤ -0.742; p < 0.001). In conclusion, the in-season demands of ice hockey resulted in significant reductions in LBP throughout a hockey season, and the 8-item fatigue questionnaire is a sensitive tool reflective of athletic performance measures.
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Affiliation(s)
| | | | - Tyler S Shimizu
- Athletics, The University of Alabama in Huntsville, Huntsville, Alabama
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Tsoukos A, Drikos S, Brown LE, Sotiropoulos K, Veligekas P, Bogdanis GC. Upper and Lower Body Power Are Strong Predictors for Selection of Male Junior National Volleyball Team Players. J Strength Cond Res 2018; 33:2760-2767. [PMID: 29385001 DOI: 10.1519/jsc.0000000000002472] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Tsoukos, A, Drikos, S, Brown, LE, Sotiropoulos, K, Veligekas, P, and Bogdanis, GC. Upper and lower body power are strong predictors for selection of male junior National volleyball team players. J Strength Cond Res 33(10): 2760-2767, 2019-The purpose of this study was to determine whether a battery of anthropometric and lower and upper body strength and speed and power tests predicted selection of young volleyball players for a Junior National Team by expert coaches. Fifty-two male junior volleyball players (14.8 ± 0.5 years, height: 1.84 ± 0.05 m, body mass: 72.5 ± 7.1 kg) took part in a training camp and underwent a selection procedure by expert coaches' of the junior national team. Anthropometric data and fitness tests results were obtained and players were graded on a scale from 0 to 100 on the basis of their performance in a volleyball tournament. Selected players were superior in the majority of measured variables (p ≤ 0.017) and had higher grading scores compared with nonselected players (85.3 ± 4.1 vs. 70.5 ± 5.6, respectively, p < 0.01). The combination of spike jump and reach (SJR) test and 3-kg medicine ball throw (MB3) velocity explained 63.5% of the variance in expert coaches' grading (p < 0.001). A multivariate discriminant analysis yielded a significant discriminant function (Wilk's lambda = 0.55, χ = 29.324, p < 0.001, η = 0.82). Spike jump and reach and MB3 were the only variables that contributed to the discriminant function (standardized function coefficients: SJR = 0.68, MB3 = 0.67). Cross-validation results showed that selection was correctly predicted in 14 of the 16 selected players (predictive accuracy: 87.5%) and in 32 of the 36 nonselected players (predictive accuracy: 88.9%). The SJR and MB3 fitness tests can predict a large portion of the variance of expert coaches' grading and successfully discriminate elite young male volleyball players for selection vs. nonselection for a junior national team. This result is very important as performance testing during a selection process may be reduced to only 2 measurements.
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Affiliation(s)
- Athanasios Tsoukos
- School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athens, Greece
| | - Sotirios Drikos
- School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athens, Greece
| | - Lee E Brown
- Human Performance Laboratory, California State University, Fullerton, Fullerton, California
| | | | - Panagiotis Veligekas
- School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athens, Greece
| | - Gregory C Bogdanis
- School of Physical Education and Sports Science, National and Kapodistrian University of Athens, Athens, Greece
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