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1.
J Orthop Surg Res ; 19(1): 400, 2024 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-38992731

RESUMO

INTRODUCTION: Ankle sprains are the second most common sports injury after knee injuries, with about 85% of them affecting the lateral ankle ligaments. These injuries are particularly prevalent in sports like basketball and volleyball. PURPOSE: To investigate the effect of Aquatic therapy as an early rehabilitation protocol for elite athletes with acute lateral ankle sprain grade III on back-to-sport time, dynamic balance, pain, Athletic performance, and muscle power compared to land-based exercise training. METHODS: Thirty elite athletes have ankle sprain grade III with sprain onset from 1 to 7 days, their age ranges from 18-30 years old were recruited. All participants are professional athletes; mainly participating in above-head sports such as volleyball and basketball. The patients were randomly allocated into two treatment groups: Group I (control group): 15 patients received a conventional physical therapy program of structured therapeutic exercise program, manual therapy and land-based exercises, in addition to external support, and Group II (Aquatic therapy group): 15 patients received aquatic training. Visual Analog Scale (VAS) was used to measure the pain intensity, while the dynamic balance was measured by the Star Excursion Balance Test. Athletic performance was measured by HOP Tests (Single, Triple, 6-m, and Cross-over hops) aided by the Agility T-Test (ATT) and Illinois Agility Test (IAT). Muscle power was tested by a Single Leg Press. Finally, back to sports time was recorded for each participant in both groups. RESULTS: There was a significant interaction effect of Aquatic therapy and time for VAS (p < 0.001), single hop (p < 0.001), triple hop (p < 0.001), cross-over hop (p < 0.001), IAT (p = 0.019) and ATT (p < 0.001) of both affected and nonaffected. There was no significant interaction effect of Aquatic therapy and time for 6-MHT of affected (p = 0.923), and nonaffected (p = 0.140). There was a significant main effect of time for all dependent variables (p < 0.001) except for 6-MHT of affected (p = 0.939), nonaffected (p = 0.109), and IAT (p = 0.099). The Star excursion dynamic balance test (SEBT) and Single leg press revealed a significant difference between groups on affected and non-affected sides (p < 0.001*). Lastly and most importantly the back-to-sport time revealed a significant difference in the return-to-sport time in favor of the Aquatic therapy group who returned faster than the control group (p < 0.001*). CONCLUSION: Aquatic therapy is more effective than traditional protocols regarding early rehabilitation of acute ankle sprain grade III in Elite professional athletes for reducing pain intensity, improving dynamic balance and athletic performance and power and accelerating their return to sports time. Because aquatic therapy produces better outcomes, it is advised to be included in the rehabilitation programs of athletic patients with acute ankle sprains grade III.


Assuntos
Traumatismos do Tornozelo , Humanos , Traumatismos do Tornozelo/reabilitação , Traumatismos do Tornozelo/terapia , Traumatismos do Tornozelo/fisiopatologia , Adulto Jovem , Masculino , Adulto , Adolescente , Feminino , Modalidades de Fisioterapia , Terapia por Exercício/métodos , Entorses e Distensões/reabilitação , Entorses e Distensões/fisiopatologia , Traumatismos em Atletas/reabilitação , Traumatismos em Atletas/terapia , Traumatismos em Atletas/fisiopatologia , Atletas , Hidroterapia/métodos , Equilíbrio Postural , Desempenho Atlético/fisiologia , Resultado do Tratamento , Voleibol/lesões
2.
PLoS One ; 19(7): e0290142, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38959207

RESUMO

AIM: This preliminary study investigated the differences in event-related potential and reaction time under two groups (athletes vs. non-athletes). MATERIAL AND METHODS: The P300 was analyzed for Fz, Cz, and Pz electrodes in thirty-one healthy volunteers divided into two groups (volleyball athletes and non-athletes). In addition, the participants performed a saccadic eye movement task to measure reaction time. RESULTS: The EEG analysis showed that the athletes, in comparison to the no-athletes, have differences in the P300 in the frontal area (p = 0.021). In relation to reaction time, the results show lower reaction time for athletes (p = 0.001). CONCLUSIONS: The volleyball athletes may present a greater allocation of attention during the execution of the inhibition task, since they have a lower reaction time for responses when compared to non-athletes.


Assuntos
Atletas , Eletroencefalografia , Tempo de Reação , Movimentos Sacádicos , Voleibol , Humanos , Tempo de Reação/fisiologia , Movimentos Sacádicos/fisiologia , Voleibol/fisiologia , Masculino , Feminino , Adulto Jovem , Adulto , Potenciais Evocados/fisiologia , Potenciais Evocados P300/fisiologia , Atenção/fisiologia
3.
Sci Rep ; 14(1): 13170, 2024 06 07.
Artigo em Inglês | MEDLINE | ID: mdl-38849450

RESUMO

This study explored sex-specific patterns in the relationship between maturity, body morphology, and change of direction (COD) and agility (AG) in adolescent volleyball players. The sample comprised 22 males and 24 females aged 15-17 with at least 4 years of sports experience. Measurements included body height, weight, muscle and fat mass, leg length, and center of mass. The study determined the Age of Peak Height Velocity (APHV) and evaluated sensorimotor ability through pre-planned COD and not-planned AG five-time shuttle runs, measuring the time difference as the index of reactivity. Positive correlations were found between COD and AG with fat mass index (FMI) in boys, while negative relative lower limb length (rLL) correlated with COD. In females, age of peak height velocity (APHV) showed a significant negative relationship with sensorimotor ability. Linear and polynomial regressions confirmed predictive and curvilinear relationships, respectively. Cluster analysis identified different associations in boys and girls, emphasizing sex-specific patterns. Body fat percentage had a negative impact on COD-AG in boys, while the optimal lower limb length proportion positively influenced COD due to enhanced maneuverability. Maturation affected sensorimotor abilities in girls. The findings suggest a need for a tailored approach to COD-AG development based on sex-specific considerations in adolescent volleyball players.


Assuntos
Desempenho Atlético , Voleibol , Humanos , Adolescente , Voleibol/fisiologia , Masculino , Feminino , Desempenho Atlético/fisiologia , Fatores Sexuais , Atletas , Caracteres Sexuais
4.
J Bodyw Mov Ther ; 39: 364-372, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38876653

RESUMO

Overhead sports overload the shoulder complex due to movement repetition and the great amount of force created during the athletic motion, which may cause adaptations in the shoulder and lead to shoulder pain. However, overhead movements include the kinetic chain, and alterations in some of the structures throughout the kinetic chain may increase stress on the shoulder complex and be associated with shoulder pain. PURPOSE: To compare kinetic chain components in overhead athletes with and without shoulder pain. METHODS: Forty-one volleyball and handball athletes (21 with and 20 without shoulder pain) were included and assessed for hip internal (IR) and external rotation (ER) range of motion (ROM), hip and trunk isometric strength, trunk endurance and neuromuscular control of the lower and upper limbs (Y balance test). RESULTS: Athletes with shoulder pain showed smaller IR ROM in both hips, lower endurance time for trunk extensors and flexors, decreased reach distance in the anterior and posteromedial direction, as well as a smaller composite score in the Y balance test (p < 0.05). CONCLUSION: Volleyball and handball athletes with shoulder pain showed changes in ROM throughout the kinetic chain in addition to lower core endurance, and decreased neuromuscular control of lower limbs.


Assuntos
Força Muscular , Amplitude de Movimento Articular , Dor de Ombro , Voleibol , Humanos , Amplitude de Movimento Articular/fisiologia , Masculino , Voleibol/fisiologia , Adulto Jovem , Feminino , Dor de Ombro/fisiopatologia , Força Muscular/fisiologia , Adulto , Fenômenos Biomecânicos/fisiologia , Rotação , Atletas , Adolescente , Tronco/fisiopatologia , Tronco/fisiologia
5.
J Bodyw Mov Ther ; 39: 531-535, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38876680

RESUMO

Body composition is a fundamental component of physical fitness related to the performance of Sitting volleyball (SV) players. Also, establishing the best method for evaluating the body composition of these para-athletes would be highly necessary for this field. The purpose of this study was (1) to describe the body composition of male and female highly trained SV players, (2) to compare the values obtained from this population by two different methods and (3) to establish validity on one of these methods. Thirteen Brazilian SV national team players (five males and eight females) participated in this study. The air-displacement plethysmography (ADP) method as the criterion assessment and the skinfolds (SF) method were conducted for each player. Results showed that there were no significant differences between the values of all players, which ADP and SF measured for body fat percentage (BF%) and body density (BD) (p > 0.05). We found significantly different values between male and female players for BF% by SF (p = 0.04) and BD by SF (p = 0.04). A high degree of reliability was found between ADP and SF measures for BF% and BD. There were statistically significant positive correlations between BF% and BD in all values for both methods (p < 0.01). This pilot study suggests that considering the magnitude of space, expense, and other limitations related to the ADP method against the SF method, we recommend using the SF method, which is a valid, viable and reliable method for measuring body composition in elite SV players.


Assuntos
Composição Corporal , Pletismografia , Dobras Cutâneas , Voleibol , Humanos , Masculino , Feminino , Voleibol/fisiologia , Projetos Piloto , Composição Corporal/fisiologia , Adulto Jovem , Pletismografia/métodos , Reprodutibilidade dos Testes , Adulto , Postura Sentada
6.
Medicine (Baltimore) ; 103(25): e38683, 2024 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-38905375

RESUMO

The aim of this study was to investigate the effect of pes planus level on counter movement jump (CMJ) performance parameters in amateur female and male volleyball players. In this context, amateur volleyball players aged between 18 and 23 years actively playing in the university school volleyball team were included in the study. Pes planus levels of the participants were analyzed using the navicular drop test (NDT). My Jump Lab application was used for CMJ measurement. Within the scope of CMJ, the participants' jump height, force, relative force, power, relative power, average speed, take-off speed, impulse, and flying time were analyzed. According to the linear regression results between NDT and CMJ parameters, force in males (t = 12.93, P = .049) and average speed in females (t = -3.52, P = .017) were significantly associated with NDT. NDT was similar in men and women (P > .05). However, all CMJ parameters were highly different between genders (P < .001). In the correlation analysis between sport age and physical characteristics and CMJ parameters; height (r = .386, P = .046), weight (r = .569, P = .002), leg length (r = .389, P = .045), foot length (r =. 558, P = .005), foot width (r = .478, P = .018), force (r = .407, P = .039), impulse (r = .460, P = .018) parameters, and sport age. The results suggest that the average speed in females and force in males both significantly influenced NDT, highlighting the significance of both factors in predicting NDT scores. Moreover, all CMJ measures showed significant variations between genders, although the NDT scores did not. Furthermore, the correlation analysis demonstrated a strong correlation between a number of physical attributes and CMJ parameters, highlighting the multifaceted nature of athletic performance and indicating the possible impact of these attributes on CMJ results.


Assuntos
Desempenho Atlético , Pé Chato , Voleibol , Humanos , Voleibol/fisiologia , Feminino , Masculino , Adulto Jovem , Desempenho Atlético/fisiologia , Adolescente , Pé Chato/fisiopatologia , Movimento/fisiologia , Fatores Sexuais , Atletas/estatística & dados numéricos
7.
J Sports Med Phys Fitness ; 64(7): 650-660, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38916088

RESUMO

BACKGROUND: This study aimed to ascertain the influence of somatotype structures on athletic performance among professional athletes. METHODS: Twenty-eight professional athletes, comprising 14 handball players and 14 volleyball players, were enlisted as participants for this study. As per the methodology, evaluations encompassing explosive power, strength, flexibility, horizontal jump, agility, sprint, and hand-foot reaction tests were conducted. Following physiological assessments, parameters including body mass index, body fat percentage, and somatotype were computed. The impact of athletes' somatotype structures on their athletic performance was investigated employing linear regression analysis. RESULTS: The endomorphy value serves as a negative predictor (r2=0.159) for explosive power, whereas the mesomorphy (r2=0.204) and ectomorphy (r2=0.379) values act as positive predictors of explosive power. Ectomorphy value negatively predicts grip strength (r2=0.399) and back strength (r2=0.214), while mesomorphy value positively predicts grip strength (r2=0.233) and back strength (r=0.338; r2=0.114). Mesomorphy value negatively predicts flexibility (r2=0.247), long jump (r2=0.311), sprint (r2=0.256), and reaction (r2=0.133), whereas ectomorphy value positively predicts flexibility (r2=0.225), long jump (r2=0.463), sprint (r2=0.393), and reaction (r2=0.208). CONCLUSIONS: This study showed a correlation between various somatotype structures and indicators of athletic performance. Within this framework, it can be inferred that mesomorphy and ectomorphy values serve as reliable predictors of athletes' performance. Furthermore, individuals with elevated mesomorphy values may exhibit enhanced strength performance, while those with higher ectomorphy values may demonstrate superior flexibility performance. Hence, when designing training programs aimed at enhancing athletes' performance attributes, it is imperative to account for the influence of body type on such performances.


Assuntos
Atletas , Desempenho Atlético , Somatotipos , Humanos , Desempenho Atlético/fisiologia , Somatotipos/fisiologia , Masculino , Adulto Jovem , Adulto , Força Muscular/fisiologia , Voleibol/fisiologia , Força da Mão/fisiologia , Índice de Massa Corporal , Teste de Esforço
8.
Int J Mol Sci ; 25(11)2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38892295

RESUMO

The increasing demand placed on professional athletes to enhance their fitness and performance has prompted the search for new, more sensitive biomarkers of physiological ability. One such potential biomarker includes microRNA (miRNA) small regulatory RNA sequences. The study investigated the levels of the selected circulating miRNAs before and after a 10-week training cycle in 12 professional female volleyball players, as well as their association with cortisol, creatine kinase (CK), and interleukin 6 (IL-6), using the qPCR technique. Significant decreases in the miR-22 (0.40 ± 0.1 vs. 0.28 ± 0.12, p = 0.009), miR-17 (0.35 ± 0.13 vs. 0.23 ± 0.08; p = 0.039), miR-24 (0.09 ± 0.04 vs. 0.05 ± 0.02; p = 0.001), and miR-26a (0.11 ± 0.06 vs. 0.06 ± 0.04; p = 0.003) levels were observed after training, alongside reduced levels of cortisol and IL-6. The correlation analysis revealed associations between the miRNAs' relative quantity and the CK concentrations, highlighting their potential role in the muscle repair processes. The linear regression analysis indicated that miR-24 and miR-26a had the greatest impact on the CK levels. The study provides insights into the dynamic changes in the miRNA levels during training, suggesting their potential as biomarkers for monitoring the adaptive responses to exercise. Overall, the findings contribute to a better understanding of the physiological effects of exercise and the potential use of miRNAs, especially miR-24 and miR-26a, as biomarkers in sports science and medicine.


Assuntos
Atletas , Biomarcadores , MicroRNA Circulante , Creatina Quinase , Voleibol , Humanos , Feminino , MicroRNA Circulante/sangue , MicroRNA Circulante/genética , Biomarcadores/sangue , Creatina Quinase/sangue , Adulto , Interleucina-6/sangue , Interleucina-6/genética , Hidrocortisona/sangue , Adaptação Fisiológica , Adulto Jovem , MicroRNAs/sangue , MicroRNAs/genética
9.
PLoS One ; 19(6): e0304743, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38917106

RESUMO

This observational study aimed to evaluate the intra- and inter-operator reliability of a digital palpation device in measuring compressive stiffness of the patellar tendon at different knee angles in talent and elite volleyball players. Second aim was to examine differences in reliability when measuring at different knee angles, between dominant and non-dominant knees, between sexes, and with age. Two operators measured stiffness at the midpoint of the patellar tendon in 45 Dutch volleyball players at 0°, 45° and 90° knee flexion, on both the dominant and non-dominant side. We found excellent intra-operator reliability (ICC>0.979). For inter-operator reliability, significant differences were found in stiffness measured between operators (p<0.007). The coefficient of variance significantly decreased with increasing knee flexion (2.27% at 0°, 1.65% at 45° and 1.20% at 90°, p<0.001). In conclusion, the device appeared to be reliable when measuring compressive stiffness of the patellar tendon in elite volleyball players, especially at 90° knee flexion. Inter-operator reliability appeared to be questionable. More standardized positioning and measurement protocols seem necessary.


Assuntos
Palpação , Ligamento Patelar , Voleibol , Humanos , Voleibol/fisiologia , Masculino , Feminino , Ligamento Patelar/fisiologia , Palpação/instrumentação , Palpação/métodos , Reprodutibilidade dos Testes , Adulto Jovem , Adulto , Amplitude de Movimento Articular/fisiologia , Articulação do Joelho/fisiologia , Adolescente , Fenômenos Biomecânicos , Variações Dependentes do Observador
10.
Sci Rep ; 14(1): 13708, 2024 06 14.
Artigo em Inglês | MEDLINE | ID: mdl-38877057

RESUMO

The aim of this study was to establish reliability of post-activation performance enhancement in three manners: (1) interday morning and afternoon reliability; (2) intraday morning and afternoon reliability; (3) intraday set-to-set reliability. Twelve elite male volleyball players experienced in resistance training performed four identical experimental sessions-two in the morning and two in the afternoon. During each session participants performed a mini complex training session-three sets of a conditioning activity (CA) (3 repetitions of a trap bar deadlift at 80% 1RM with 15% of accommodating resistance) and 90 s after a CA performed squat jump (SJ) with 4 min intra-set rest interval. The ANOVA with repeated measures was used to assess significance of the effect of a CA and ICC to assess reliability of measurements. The PAPE protocol was found to be ineffective to subsequently enhance JH on various occasions. Also, the results of this study suggest that the practitioners may effectively implement appropriately organized complex training as both intraday set-to-set (0.87 and 0.82 for morning sessions; 0.83 and 0.58 for afternoon sessions) and interday morning (0.67) and afternoon (0.8) reliabilities seem to be acceptable. However, introducing two CT sessions within one day is highly questionable as at the moment intraday morning and afternoon reliability is vague (0.88 and 0.48).


Assuntos
Desempenho Atlético , Voleibol , Humanos , Masculino , Voleibol/fisiologia , Desempenho Atlético/fisiologia , Adulto Jovem , Adulto , Treinamento Resistido/métodos , Atletas , Reprodutibilidade dos Testes
11.
Int J Sports Physiol Perform ; 19(7): 696-704, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38772546

RESUMO

PURPOSE: This cohort study aimed to investigate the relationship between subjective (wellness and internal training load [ITL]) and objective (neuromuscular fatigue) monitoring markers and performance aspects (reception quality [RQ] and attack efficiency [AE]) in professional female volleyball players. METHODS: The study was conducted over an 8-week period during the final mesocycle of the competitive phase. A total of 24 training sessions and 10 matches were included in the analysis. Subjective measures of wellness and ITL were assessed, and neuromuscular fatigue was evaluated using countermovement-jump (CMJ) height. RQ and AE were determined based on game statistics. RESULTS: The study found a positive relationship between wellness and RQ, particularly affecting outside hitters and liberos. ITL showed a positive association with AE, primarily impacting outside hitters, opposite hitters, and middle blockers. Additionally, ITL demonstrated a negative correlation with RQ, mainly affecting outside hitters and liberos. CMJ performance was associated with AE, where a decrease in CMJ height was linked to reduced AE. CONCLUSIONS: The findings highlight the importance of considering players' wellness scores in training and match strategies for different positions. Careful management of training loads, considering both physical and technical demands, is crucial for optimizing performance outcomes. Monitoring neuromuscular fatigue, as indicated by CMJ performance, is particularly relevant for outside hitters, opposite hitters, and middle blockers involved in attack actions. Coaches, trainers, and sports practitioners can use these insights to develop position-specific training protocols and implement effective strategies for maintaining or improving performance metrics under various stressors.


Assuntos
Desempenho Atlético , Fadiga Muscular , Voleibol , Humanos , Feminino , Voleibol/fisiologia , Desempenho Atlético/fisiologia , Fadiga Muscular/fisiologia , Adulto Jovem , Condicionamento Físico Humano/métodos , Comportamento Competitivo/fisiologia , Adulto , Nível de Saúde , Estudos de Coortes
12.
Phys Ther Sport ; 67: 155-160, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38810390

RESUMO

OBJECTIVES: To evaluate the reliability of the Enhanced Paper Grip Test (EPGT) for assessing foot strength in volleyball and soccer players. DESIGN: A cross-sectional observational study with repeated measurements. SETTING: Field-based study. PARTICIPANTS: A convenience sample of 28 athletes (13 volleyball players and 15 soccer players) participated in the study. MAIN OUTCOME MEASURES: The main outcome measures were the intraclass correlation coefficients (ICC) for intra-visit and inter-visit reliability, typical error, and coefficient of variation for the force (N) recorded in EPGT test. RESULTS: The EPGT demonstrated good to excellent relative reliability (ICC values ranged from 0.93 to 0.97) and acceptable absolute reliability (typical error = 5-8 % of the mean). Significant inter-limb asymmetries were observed in both volleyball (16.0 ± 10.2%) and soccer players (15.3 ± 9.8%). CONCLUSIONS: The EPGT is a reliable tool for assessing foot strength in volleyball and soccer players. Further research is required to explore the applicability of EPGT in different athletic and clinical contexts, and its potential role in athletic performance and injury prevention.


Assuntos
, Força da Mão , Futebol , Voleibol , Humanos , Voleibol/fisiologia , Futebol/fisiologia , Estudos Transversais , Reprodutibilidade dos Testes , Masculino , Pé/fisiologia , Adulto Jovem , Força da Mão/fisiologia , Força Muscular/fisiologia , Adulto , Adolescente , Feminino , Teste de Esforço
13.
Motor Control ; 28(3): 341-361, 2024 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-38702047

RESUMO

The aim of this study was to examine the effect of attentional focus instructions on the biomechanical variables associated with the risk of anterior cruciate ligament injury of the knee joint during a drop landing task using a time series analysis. Ten female volleyball players (age: 20.4 ± 0.8 years, height: 169.7 ± 7.1 cm, mass: 57.6 ± 3.1 kg, experience: 6.3 ± 0.8 years) performed landings from a 50 cm height under three different attentional focus conditions: (1) external focus (focus on landing as soft as possible), (2) internal focus (focus on bending your knees when you land), and (3) control (no-focus instruction). Statistical parameter mapping in the sagittal plane during the crucial first 30% of landing time showed a significant effect of attentional focus instructions. Despite the similarity in landing performance across foci instructions, adopting an external focus instruction promoted reduced vertical ground reaction force and lower sagittal flexion moment during the first 30% of execution time compared to internal focus, suggesting reduced knee loading. Therefore, adopting an external focus of attention was suggested to reduce most biomechanical risk variables in the sagittal plane associated with anterior cruciate ligament injuries, compared to internal focus and control condition. No significant differences were found in the frontal and horizontal planes between the conditions during this crucial interval.


Assuntos
Atenção , Articulação do Joelho , Voleibol , Humanos , Feminino , Voleibol/fisiologia , Fenômenos Biomecânicos/fisiologia , Articulação do Joelho/fisiologia , Adulto Jovem , Atenção/fisiologia , Lesões do Ligamento Cruzado Anterior/fisiopatologia
14.
Med Eng Phys ; 128: 104174, 2024 06.
Artigo em Inglês | MEDLINE | ID: mdl-38789218

RESUMO

Scleroderma is a chronic and progressive autoimmune disorder of connective tissues often causing lesions and deformities of the hands. Individuals affected by this condition experience daily life limitations and are typically unable to take part in sport activities that involve impacts on the hands. In this article we describe the design and manufacturing of custom-made hand orthoses to play sitting volleyball, for an elite paralympic athlete affected by scleroderma. The devices consist of a carbon fibre shell with an internal silicone padding and an external polymeric multilayer cover. The manufacturing of the orthoses involves digital modelling, 3D printing, composite lamination and an innovative method to create a strong and durable chemical bonding between silicone and carbon fibre. The internal silicone padding proved to be effective in hosting and protecting the hands, whereas the external shell with polymeric multilayer cover allowed to dampen the ball shocks while effectively hitting the ball. Indeed, these devices allowed the athlete to take part in the 2020 Tokyo Paralympic games and were used for two years without showing any damage.


Assuntos
Desenho de Equipamento , Mãos , Aparelhos Ortopédicos , Voleibol , Humanos , Atletas , Escleroderma Sistêmico , Impressão Tridimensional
15.
PeerJ ; 12: e17387, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38770095

RESUMO

Purpose: The aim of this study was to assess the reliability and validity of the My Jump 2® app in measuring jump height, flight time, and peak power among elite women beach volleyball players on sand surfaces. Methods: Eleven elite female beach volleyball players (aged 23.6 ± 6.2 years; weight 66.3 ± 5.8 kg; height 174.4 ± 5.8 cm; with 8.4 ± 4.8 years of professional experience) participated in this study. Each player performed six countermovement jumps in a wooden box filled with sand on a force platform while simultaneously recording a video for subsequent analysis using the My Jump 2® app. Results: We found excellent agreement for flight time, jump height and peak power between observers (ICC = 0.92, 0.91 and 0.97, respectively). No significant differences between force platform and My Jump 2® app were detected in the values obtained for the three variables (P > 0.05). For the force platform and the My Jump 2® app, we found a good agreement measuring jump height and flight time (ICC = 0.85 and 0.85, respectively). However, we only found a moderate agreement for peak power (ICC = 0.64). The difference in jump height showed a limit of agreement between -4.10 and 4.74 cm in Bland-Altman, indicating a high level of agreement between the two measurement tools. Conclusion: Based on our findings, the My Jump 2® app reveals a valid tool for measuring jump height and flight time of CMJ on sand surfaces. However, more caution is needed when measuring peak power.


Assuntos
Aplicativos Móveis , Voleibol , Humanos , Feminino , Voleibol/fisiologia , Reprodutibilidade dos Testes , Adulto Jovem , Adulto , Desempenho Atlético/fisiologia , Teste de Esforço/métodos , Teste de Esforço/instrumentação , Atletas
17.
Scand J Med Sci Sports ; 34(5): e14635, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38671558

RESUMO

The aim was to determine how jump load affects knee complaints in elite men's volleyball. We collected data from four men's premier league volleyball teams through three seasons in a prospective cohort study (65 players, 102 player-seasons). Vert inertial measurement devices captured the jump load (jump frequency and jump height) from 21 088 daily player sessions, and knee complaints were reported in 3568 weekly OSTRC-O questionnaires. Mixed complementary log-log regression models described the probability of (i) experiencing symptoms if players were currently asymptomatic, (ii) worsening symptoms if players had symptoms, and (iii) recovery from knee complaints. Based on our causal assumptions, weekly jump load was modeled as the independent variable, adjusted for age (years), weight (kg), position on volleyball team, and past jump load. No certain evidence of an association was found between weekly jump load and probability of (i) knee complaints (p from 0.10 to 0.32 for three restricted cubic splines of load), (ii) worsening symptoms if the player already had symptoms (p from 0.11 to 0.97), (iii) recovery (p from 0.36 to 0.63). The probability of knee complaints was highest for above-average weekly jump load (~1.2% for an outside hitter with mean age and height) compared with low loads (~1%) and very high loads (→ ~ 0%). The association between jump load and knee complaints risk remains unclear. Small differences in risk across observed jump load levels were observed. It would likely require substantially increased sample sizes to detect this association with certainty.


Assuntos
Voleibol , Humanos , Masculino , Voleibol/lesões , Estudos Prospectivos , Adulto Jovem , Adulto , Articulação do Joelho/fisiologia , Inquéritos e Questionários
18.
J Sports Sci ; 42(6): 511-518, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38676287

RESUMO

Exploration is an important feature for successfully learning motor skills. However, game rules such as one attempt to serve in volleyball could discourage exploration due to an individual's fear of making a mistake and forfeiting a point. The constraints-led approach is a coaching methodology that encourages exploration by selectively manipulating task constraints such as rules. Therefore, the aim of this study was to examine whether the addition of the task constraint of a second serve would encourage volleyball players to use their first serve to explore their action capabilities. Forty male high school students competed in two volleyball games; a regulation (single serve) game and a modified (2-serve) game. Participants reported that having a second chance at serving allowed them to feel more confident and relaxed which facilitated the exploration of their serving capability. In the 2-serve game, participants attempted a more powerful (M = 60.3 km/hr), and complex (M = 44.5% jump topspin serves) first serve, compared to the regulation game (M = 55.6 km/hr; M = 25.2% jump topspin serves). Findings suggest that to facilitate learning of motor skills, it is important to manipulate the practice environment using task constraints to address the factors that restrict exploration.


Assuntos
Aprendizagem , Destreza Motora , Voleibol , Humanos , Voleibol/fisiologia , Masculino , Destreza Motora/fisiologia , Adolescente , Desempenho Atlético/fisiologia , Desempenho Atlético/psicologia , Comportamento Exploratório , Tutoria
19.
Int J Sports Physiol Perform ; 19(6): 533-544, 2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38561004

RESUMO

PURPOSE: This study aimed at evaluating the effect of level of competition and drill typology on loads during the preseason period in male volleyball players. METHODS: Internal (percentage of peak heart rate [HR] and summated HR zone) and external (PlayerLoad per minute, total and high accelerations per minute [tACCmin and hACCmin], decelerations per minute [tDECmin and hDECmin], and jumps per minute [tJUMPmin and hJUMPmin]) loads were monitored across a 5-week preseason period in 12 Division 1 (age: 22.5 [3.9] y; stature: 188 [6.2] cm; body mass: 85 [11.6] kg; training experience: 9.4 [4.2] y) and 12 Division 2 (age: 20.7 [2.9] y; stature: 186 [6.2] cm; body mass: 77.8 [9.6] kg; training experience: 5.6 [2.3] y) male volleyball players. Furthermore, differences in load were assessed for each drill typology (warm-up, conditioning, technical, tactical, and integral). RESULTS: No effects (P > .05) of level of competition on the internal (except for summated HR zone, P = .05) and external loads (except for tJUMPmin, P = .002) were found. Differently, drill typologies showed an effect (P < .001) on all the investigated internal- and external-load measures. The main post hoc results revealed higher (P < .05) percentage of peak HR, summated HR zone, PlayerLoad per minute, and tACCmin in warm-up and conditioning drills, while higher (P < .05) hDECmin and hJUMPmin were found in tactical and integral drills. CONCLUSIONS: These results suggest that volleyball coaches use warm-up and conditioning drills when aiming at increasing the internal loads, PlayerLoad per minute, and tACCmin, while tactical and integral drills should be preferred to enhance the number of hDECmin and hJUMPmin.


Assuntos
Aceleração , Desempenho Atlético , Comportamento Competitivo , Frequência Cardíaca , Voleibol , Humanos , Masculino , Voleibol/fisiologia , Adulto Jovem , Frequência Cardíaca/fisiologia , Comportamento Competitivo/fisiologia , Desempenho Atlético/fisiologia , Condicionamento Físico Humano/métodos , Exercício de Aquecimento/fisiologia , Desaceleração
20.
Psychol Sport Exerc ; 73: 102655, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38677497

RESUMO

Grounded in Self-Determination Theory, this game-to-game study among Flemish volleyball coaches and athletes had two primary objectives. First, we examined how variations in need-supportive and need-thwarting coaching styles related to variations in athletes' basic psychological needs, motivation, and coach-rated performance. Second, we examined whether athletes who perceived their coach as need-thwarting during a specific game would experience different outcomes based on the overall need-supportive or need-thwarting coaching style they encountered across games. Linear mixed modeling on data from 190 elite volleyball athletes (Mage = 23.95, 32.6 % male) and their 26 coaches (Mage = 48.12, 95.7 % male) indicated positive associations between game-specific need-supportive coaching and athletes' reports of game-specific basic psychological need experiences and motivation, as well as coach-rated performance, whereas game-specific need-thwarting coaching showed opposite trends. Athlete perceptions of a coaching style were more predictive of the outcomes than coach perceptions. Second, the lack of systematic cross-level interactions between game-specific coaching and team-level coaching indicated that the observed correlates of game-specific need-thwarting and need-supportive coaching hold regardless of the perceived overall need-thwarting or need-supportive style of the coach across games.


Assuntos
Atletas , Desempenho Atlético , Tutoria , Motivação , Voleibol , Humanos , Voleibol/psicologia , Masculino , Feminino , Tutoria/métodos , Adulto Jovem , Desempenho Atlético/psicologia , Adulto , Atletas/psicologia , Comportamento Competitivo , Autonomia Pessoal , Pessoa de Meia-Idade
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