Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 6.199
Filtrar
1.
Rev. andal. med. deporte ; 13(4): 257-260, dic. 2020.
Artigo em Espanhol | IBECS | ID: ibc-195074

RESUMO

La actual situación de pandemia producida por el SARS-CoV-2, obliga a los laboratorios de fisiología del ejercicio a tomar una serie de medidas adicionales para la realización segura de las pruebas de esfuerzo, tanto diagnósticas como de rendimiento. El objetivo del presente trabajo es exponer las medidas a adoptar, para la prevención del contagio por el SARS-CoV-2, durante la realización de pruebas de esfuerzo a deportistas, propuestas por los profesionales del Centro Andaluz de Medicina del Deporte, basadas en la evidencia científica disponible, y que están orientadas hacia su aplicación en el propio laboratorio, a los atletas y a todos los profesionales que participan en su evaluación


The current pandemic situation, produced by SARS-CoV-2, forces exercise physiology laboratories to take a series of additional measures for the safe performance of stress tests, both diagnostic and performance. The objective of this report is to present preventive measures to be taken to avoid contagion by SARS-CoV-2 during exercise tests on athletes, proposed by the professionals of the Andalusian Center for Sports Medicine, based on scientific evidence available, and oriented towards its application in the laboratory itself, to athletes and to all professionals who participate in its evaluation


A atual situação de pandemia produzida pelo SARS-CoV-2 obriga os laboratórios de fisiologia do exercício a tomar uma série de medidas adicionais para a realização segura dos testes de esforço, tanto de diagnóstico quanto de desempenho. O objetivo deste trabalho é apresentar as medidas a serem adotadas para a prevenção do contágio pelo SARS-CoV-2 durante testes de exercício em atletas, propostas pelos profissionais do Centro Andaluz de Medicina do Esporte, com base em evidências científicas disponíveis, e que são orientados para a sua aplicação no próprio laboratório, aos atletas e a todos os profissionais que participam na sua avaliação


Assuntos
Humanos , Infecções por Coronavirus/prevenção & controle , Teste de Esforço/métodos , Gasometria/métodos , Atletas/estatística & dados numéricos , Desempenho Atlético/fisiologia , Controle de Doenças Transmissíveis/organização & administração , Pandemias , Quarentena , Distância Social , Esportes/fisiologia , Precauções Universais/métodos
2.
Medicine (Baltimore) ; 99(45): e23144, 2020 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-33157996

RESUMO

Cardiac remodeling is common in the athletes. Little data is available regarding the cardiac remodeling on the recently proposed 4 sport disciplines among the elite university athletes.A total of 7639 athletes participated in the 2017 Taipei Summer Universiade. Cardiac evaluation via history, ECG, and echocardiography were performed in 826 athletes who signed up for Check Up Your Heart. Athletes were grouped into one of 4 sport disciplines Skill, Power, Mixed, and Endurance.After excluding 66 participants with missing demographic data, 13 missing echocardiographic data, and 24 inadequate echocardiographic images, a total number of 723 university athletes (mean age 23 ±â€Š3 years, 419 males) from 99 countries engaging in 25 different sporting events were analyzed. Electrocardiograms showed that Endurance group had a slower heart rate and higher percentage of left ventricular (LV) hypertrophy (39%). Echocardiograms showed there were significant differences in LV mass index (P < .001), LV geometry (P < .001), left atrial (LA) dilatation (P = .026), right ventricular (RV) dilatation (P < .001), right atrial (RA) dilatation (P < .0001), and tricuspid annular plane systolic excurse (P = .006). LV ejection fraction, LV strain, RV strain, and LV diastolic function showed no difference in 4 sport disciplines.Eccentric LV hypertrophy was the most common type of cardiac remodeling in the university athletes participated in 2017 Taipei Summer Universiade. Adaptive changes in chamber size were more commonly seen in Endurance sport. RA dilatation was the most sensitive to hemodynamic demand, followed by RV dilatation, LA dilatation, and LV dilatation.


Assuntos
Remodelamento Atrial , Esportes/fisiologia , Remodelação Ventricular , Adulto , Estudos Transversais , Feminino , Humanos , Masculino , Estudos Retrospectivos , Taiwan , Universidades , Adulto Jovem
3.
Artigo em Inglês | MEDLINE | ID: mdl-32992687

RESUMO

Rules determine how team sport matches occur. Match-induced fatigue is specific to each sport, and may be associated with injury incidence. For example, the injury rate in soccer is distinctly higher during matches than in training sessions. Understanding the differences between team sports rules might be useful for enhancing rules (e.g., safer sport). Therefore, this study aimed to evaluate the impact of the rule-induced physical demands between soccer, futsal, basketball, and handball, focusing on substitution rules. Data from the elite team sports' rules (e.g., absolute and relative court dimensions; the number of players, substitutions allowed, total game time, time-outs) were collected, including the changes due to the coronavirus disease (COVID-19) pandemic in soccer substitutions, and comparisons were performed. The data showed that soccer has higher rule-induced physical demands: e.g., substantially lower substitution rate, higher dimensions in absolute (eight to fifteen times), and relative (four to eight times) values. Simulations also showed that soccer has extremely large differences, even considering COVID-19 substitution changes (from three to up to five). We conclude that elite soccer has remarkably higher overall rule-induced physical demands than elite futsal, basketball and handball, and increasing soccer substitutions permanently (e.g., unlimited) might mitigate overall soccer demands.


Assuntos
Atletas , Esforço Físico , Futebol/fisiologia , Esportes/fisiologia , Betacoronavirus , Infecções por Coronavirus , Humanos , Pandemias , Pneumonia Viral
4.
PLoS One ; 15(9): e0233475, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32946458

RESUMO

We aimed to compare the match-play and kinematic demands of the translation and rotation movements of elite wheelchair padel players as a function of match results. Twenty-two elite male players were video-analysed with a two-dimensional direct linear transformation (DLT) -corrected video system across seven matches of a professional tournament. Distance, turns, changes of direction, linear and angular speed, acceleration and the players' heart rate (HR) were recorded. Losing couples in wheelchair padel covered greater distances than winners (P <0.001; r = 0.024) and did so at a higher speed (P <0.001; r = 0.06), while making greater efforts by accelerating (P <0.001; ∅ = -0.021), braking (P <0.001; ∅ = -0.014), and remaining less time stationary (P <0.001; ∅ = 0.059). In addition, losers performed more turns per rally (P <0.001; r = 0.04) at a faster speed, greater angular accelerations (P <0.001; V = 0.06) and greater average (P = 0.007; d = 0.91) and maximum (P = 0.20; d = 0.69) HR values. These data suggest that winner couples performed a better court positioning and employed a strategy to move the opponent during rallies in order to avoid them optimally reaching the ball.


Assuntos
Desempenho Atlético/fisiologia , Paratletas , Esportes/fisiologia , Cadeiras de Rodas , Aceleração , Adulto , Fenômenos Biomecânicos/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos de Tempo e Movimento , Gravação em Vídeo
5.
Orthop Clin North Am ; 51(4): 441-452, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32950213

RESUMO

It is essential for total knee arthroplasty patients to return to their previous level of activity to maintain a healthy lifestyle. This article reviews the current recommendations regarding return to physical activity after total knee arthroplasty and trying to find the balance between levels of activity and prosthetic joint preservation. In general, most total joint replacement patients are able to return to their previous level of activity and to a lesser extent to sports. This article discuss patients' actual levels of activity including their return to work and sport and the factors that influence meeting their expectations for surgery.


Assuntos
Artroplastia de Quadril/reabilitação , Artroplastia do Joelho/reabilitação , Humanos , Volta ao Esporte , Esportes/fisiologia
6.
Rev. int. med. cienc. act. fis. deporte ; 20(79): 435-451, sept. 2020. graf, tab
Artigo em Espanhol | IBECS | ID: ibc-197047

RESUMO

Esta investigación plantea como objetivo principal diseñar un instrumento de registro que permita describir y relacionar tres niveles de acción del balonmano (juego de equipo, juego grupal y juego individual), vinculándolos al contexto de competición y atendiendo a su eficacia. Siguiendo las directrices de la metodología observacional se opta por un sistema combinado de formatos de campo y sistema de categorías, utilizando un diseño de investigación de carácter ideográfico, puntual y multidimensional. Se utiliza como instrumento de registro el software Dartfish TeamPro V.4.5 para analizar siete partidos de categoría absoluta, y siete partidos de categoría infantil, generándose datos de tipo concurrente y de evento. Se aplican técnicas estadísticas descriptivas e inferenciales bivariadas para el análisis relacional de los datos. Destacamos los resultados que constatan la asociación entre sistemas de juego y procedimientos colectivos tanto ofensivos como defensivos, y la dificultad en establecer relaciones significativas entre el ataque y la defensa


The main aim of this research was to design a recording tool that allows describing and relating three levels of action in team handball (team play, group play and individual play), linking them to the competition context and taking their effectiveness into account. Following the guidelines of observational methodology, we selected a combined system of field formats and system of categories, using an ideographic, specific and multidimensional research design. Dartfish TeamPro V.4.5 software, was used as a recording instrument to analyse seven matches in the top category, and seven matches in the children's category, generating concurrent and event data. Bivariate descriptive and inferential statistical techniques were used for the relational analysis of the data. The results confirmed the association between game systems and collective procedures, both offensive and defensive, as well as the difficulty to establish significant relationships between attack and defense


Assuntos
Humanos , Masculino , Adolescente , Atletas , Esportes/fisiologia , Treinamento de Resistência/métodos , Equipamentos Esportivos/normas , Eficácia , Desempenho Físico Funcional , Análise de Variância , Esportes/normas
7.
Rev. int. med. cienc. act. fis. deporte ; 20(79): 487-506, sept. 2020. graf, tab
Artigo em Espanhol | IBECS | ID: ibc-197050

RESUMO

El objetivo de este trabajo se centra en construir y validar una herramienta que permita, de forma fiable, evaluar el conocimiento de base de jugadores con discapacidad intelectual leve en aspectos de táctica ofensiva en FS, permitiendo usarlo como evaluación inicial complementaria que guíe el proceso de entrenamiento. El tamaño muestral fue de 68 jugadores (Medad=27; SDedad=9.06 y Mexperiencia=11.78; SDexperiencia=1,29). Los resultados muestran valores adecuados de consistencia interna y de fiabilidad (α=0.64, ω=0.74, ICC=0.64 y test-retest). De manera complementaria, se realizó un análisis cualitativo, mediante una entrevista colectiva a un grupo de expertos, sobre la utilidad del instrumento en esta población de deportistas. Los resultados permiten establecer una sólida base para el empleo de este instrumento en futuros estudios


The objective of this work is to build and validate a tool that allows, reliably, evaluate the base knowledge of players with mild intellectual impairment in aspects of offensive tactical in FS, so that it can be used as an additional initial evaluation to guide the training process of coaches. The sample size is constituted by 68 subjects (Mage=27; SDage=9.06 y Mexperience=11.78; SDexperience=1,29). The results show satisfactory internal consistency and reliability values (α=0.64, ω=0.74, ICC=0.64 and test-retest). In a complementary manner, a qualitative analysis was carried out, through a collective interview with a group of experts, about the utility of the instrument in this population of athletes. The results allow to establish a solid base for the use of this instrument in future studies


Assuntos
Humanos , Deficiência Intelectual/fisiopatologia , Desempenho Atlético/fisiologia , Esportes/fisiologia , Futebol/fisiologia , Destreza Motora/fisiologia , Esportes para Pessoas com Deficiência/fisiologia , Esportes/normas , Tomada de Decisões , Futebol/educação , Basquetebol , Tênis , Pessoas com Deficiência/psicologia
8.
Rev. int. med. cienc. act. fis. deporte ; 20(79): 551-566, sept. 2020. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-197054

RESUMO

Las transiciones en triatlón afectan al rendimiento y riesgo de lesión. El objetivo fue determinar la fatiga neuromuscular inducida por 40 km de ciclismo y la eficacia del entrenamiento pliométrico en la fatiga y rendimiento de la carrera a pie. Participaron doce triatletas, 5 realizaron un entrenamiento pliométrico y 7 continuaron su entrenamiento habitual. Se realizaron tests de salto antes y después de 40 km de ciclismo para determinar la fatiga y se registró el ritmo de 5 km de carrera. Se observaron diferencias significativas en la altura de salto (p < 0,05) indicando que 40 km de ciclismo inducen fatiga en la extremidad inferior. Tras el entrenamiento pliométrico se observaron mejoras significativas en el test Squat Jump posterior al ciclismo (p = 0,038) y en el ritmo del primer kilómetro (p = 0,015). El entrenamiento pliométrico parece ser más eficaz que el entrenamiento habitual para mejorar la fatiga neuromuscular y el ritmo del primer kilómetro


The transition between the different phases of triathlon affects both athletic performance and risk of injury. The aim was to determine the neuromuscular fatigue induced by 40 km cycling and the plyometric training efficacy in order to improve such fatigue and running performance. Twelve triathletes participated, 5 of them did specific plyometric training versus 7 who continued with their usual training. Different jump tests were carried out before and after 40 km cycling in order to determine the fatigue, the 5km-running pace was also recorded. Significant differences were observed in the jump height (p < 0,05) post-cycling, showing that 40 km cycling induces leg neuromuscular fatigue. After the plyometric training, significant improves were observed in the Squat Jump Test post-cycling (p = 0,038) and in the first kilometre running pace (p = 0,015). The plyometric training seems to be more effective than usual training to improve cycling induced neuromuscular fatigue and the first kilometre running pace


Assuntos
Humanos , Masculino , Feminino , Adulto Jovem , Adulto , Fadiga Muscular/fisiologia , Esportes/fisiologia , Projetos Piloto , Desempenho Atlético , Ciclismo/fisiologia , Corrida/fisiologia , Atletas/estatística & dados numéricos , Estudos Longitudinais
9.
Sportis (A Coruña) ; 6(3): 517-532, sept. 2020. ilus, graf, tab
Artigo em Inglês | IBECS | ID: ibc-197062

RESUMO

The purpose of this study is to determine the effect of an acute local vibration exercise on the visual reaction time of a fencer's upper body extremities. Twenty-six male fencers between the ages of 15 and 23 (mean age, 17.38 ± 2.13 years, height: 173.6±9.1 cm, body mass: 70.2 ±14.1 kg) volunteered for this study. The reaction time test was applied before and after the vibration exercise (applied for 30 seconds in 27 Hz with a 2-mm amplitude). After 25 min. standard warming up, fencers were informed about the test, and three repeated reaction tests were performed to provide familiarization. The fencers started the reaction test in the standard fencing guard position. According to five signals coming at two to five second intervals from the target monitor, the fencers made touché by bending (attacking). The reaction time test had five trials. The average reaction time values pre-vibration, and post-vibration were compared. The visual reaction time measured pre-vibration were significantly longer than those measured post-vibration (p < 0.001). Acute local vibration exercise applied to fencers shortened the visual reaction time. Given the fact that vibration can improve RT, the use of vibration in training has the potential to provide an advantage to fencers


El propósito de este estudio es determinar el efecto de un ejercicio de vibración local aguda en el tiempo de reacción visual de las extremidades superiores de un esgrimidor. Veintiséis esgrimidores masculinos entre las edades de 15 y 23 (edad media, 17.38 ± 2.13 años, altura: 173.6 ± 9.1 cm, masa corporal: 70.2 ± 14.1 kg) se ofrecieron como voluntarios para este estudio. La prueba del tiempo de reacción se aplicó antes y después del ejercicio de vibración (aplicado durante 30 segundos en 27 Hz con una amplitud de 2 mm). Después de 25 min. calentamiento estándar, se informó a los esgrimidores sobre la prueba y se realizaron tres pruebas de reacción repetidas para proporcionar familiarización. Los esgrimidores comenzaron la prueba de reacción en la posición estándar de protección de esgrima. De acuerdo con cinco señales que vienen a intervalos de dos a cinco segundos desde el monitor objetivo, los esgrimistas hicieron un toque al doblarse (atacar). La prueba del tiempo de reacción tuvo cinco ensayos. Se compararon los valores promedio de tiempo de reacción pre-vibración y post-vibración. El tiempo de reacción visual medido antes de la vibración fue significativamente mayor que el medido después de la vibración (p <0.001). El ejercicio de vibración local aguda aplicado a los esgrimidores acortó el tiempo de reacción visual. Dado que la vibración puede mejorar la RT, el uso de la vibración en el entrenamiento tiene el potencial de proporcionar una ventaja a los esgrimidores


Assuntos
Humanos , Masculino , Adolescente , Adulto Jovem , Adulto , Vibração , Visão Ocular/fisiologia , Esportes/fisiologia , Tempo de Reação/fisiologia , Desempenho Atlético/fisiologia , Desempenho Psicomotor/fisiologia , Percepção Espacial/fisiologia , Reflexo/fisiologia , Movimentos Oculares/fisiologia , Orientação/fisiologia , Software , Antropometria
11.
PLoS One ; 15(8): e0237584, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32841263

RESUMO

Esports as the competitive play of digital games has gained considerable popularity. However, a comprehensive framework for esport training is still missing. In this paper, a performance model integrating insights from game research and sport science is developed. Based on this model, an online questionnaire was designed and applied to investigate training in different esports regarding relevant competencies and training areas. Overall, 1,835 esports players voluntarily participated in the study. Age ranged from 13 to 47 years (M = 20,9; SD = 4,5), and males clearly dominated (95%). Furthermore, the mean weakly playing time was 20.03 hours (SD = 15.8). Training occupied 38.85% (7.75 h) of the playing time on average. On the one hand, the results reveal game-specific competence and training structures in the five esports selected for the study (Starcraft II, League of Legends, Rocket League, FIFA, and Counter Strike). On the other hand, the factor structure of competencies closely resembles the esports performance model. As a conclusion, esports training methods should always consider the specific competence profile of the respective esports game.


Assuntos
Educação Física e Treinamento/métodos , Esportes/fisiologia , Esportes/psicologia , Jogos de Vídeo/psicologia , Adolescente , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
12.
PLoS One ; 15(8): e0237727, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32810165

RESUMO

Equestrian sports have been a source of numerous studies throughout the past two decades, however, few scientists have focused on the biomechanical effects, including muscle activation, that the horse has on the rider. Because equitation is a sport of two (the horse-human dyad), we believe there is a need to fill in the knowledge gap in human biomechanics during riding. To investigate the differences between novice and advanced riders at a neuromuscular level we characterized the motor output of a set of riders' key muscles during horse riding. Six recreational riders (24 ± 7 years) and nine professional riders (31 ± 5 years) from the Spanish Classical School of Riding (Lipica) volunteered to take part in this study. Riders' upper body, core and lower limb muscles were monitored and synchronized with inertial data from the left horse's leg at walk, rising trot and canter. We used principal component analysis to extract muscle modes. Three modes were identified in the advanced group whereas five modes were identified in the novice group. From the novice group, one mode united dorsal and ventral muscles of the body (reciprocal mode). Advanced riders showed higher core muscles engagement and better intermuscular coordination. We concluded that advanced horse riding is characterized by an ability to activate muscles contralaterally but not reciprocally (dorsal-ventral contraction). In addition, activating each muscle independently with different levels of activation, and the ability to quickly decrease overall muscle activity is distinctive of advanced riders.


Assuntos
Cavalos/fisiologia , Movimento/fisiologia , Músculo Esquelético/fisiologia , Esportes/fisiologia , Adolescente , Adulto , Animais , Fenômenos Biomecânicos , Estudos Transversais , Eletromiografia , Humanos , Análise de Componente Principal , Adulto Jovem
13.
J Electromyogr Kinesiol ; 53: 102442, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32659610

RESUMO

The monoaminergic bulbospinal pathways from the brainstem are central to motor functions by regulating the gains of spinal motoneurons and represent, in that respect, probably the primary control system for motoneuron excitability. Yet, the efficiency of this system is few, if not never, assessed in the fields of sports and exercise sciences. In this review paper, we propose a methodological approach intended to assess how this neuromodulatory system affects motoneuron excitability. This approach is based on the use of tendon vibration which can, in certain circumstances, induce the generation of the so-called tonic vibration reflex through the stimulation of muscle spindles. Force and EMG responses to tendon vibration are indeed indicative of how this descending system modulates the gain of the ionotropic inputs from Ia afferents and thus of the strength of the monoaminergic drive. After a brief presentation of the neuromodulatory system and of the mechanisms involved in the generation of the tonic vibration reflex, we address some important methodological considerations regarding the use of the TVR to probe this neuromodulatory gain control system. Hopefully, this paper will encourage sports and exercise scientists to investigate this system.


Assuntos
Exercício Físico/fisiologia , Neurônios Motores/fisiologia , Tratos Piramidais/fisiologia , Esportes/fisiologia , Eletromiografia/métodos , Eletromiografia/tendências , Humanos , Contração Muscular/fisiologia , Fusos Musculares/fisiologia , Músculo Esquelético/fisiologia , Reflexo/fisiologia
14.
Sports Health ; 12(5): 441-448, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32660392

RESUMO

BACKGROUND: Physical activity (PA) and physical fitness (PF) are crucial for bone health. However, children participating in competitive sports with high PA are at a greater risk of fracture from trauma or overuse. Given the importance of bone development during adolescence, associations between commonly used physical fitness tests with distal third radius (R-SoS) and midshaft tibia (T-SoS) speed of sound by quantitative ultrasound were assessed in adolescent athletes and nonathletes. HYPOTHESIS: The relationship between physical fitness tests and R-SoS and T-SoS will differ depending on sex and athletic status. STUDY DESIGN: Cross-sectional study. LEVEL OF EVIDENCE: Level 3. METHODS: Physical fitness of 285 boys (156 athletes) and 311 girls (74 athletes) aged 10 to 18 years was assessed through strength, speed, agility, and cardiorespiratory tests. Linear regression was used to assess the associations of physical fitness tests with R-SoS and T-SoS. RESULTS: For boys, favorable associations were observed between physical fitness tests with R-SoS in athletes and T-SoS in both athletes and nonathletes (P < 0.05). For nonathlete girls, favorable associations were found for handgrip (R-SoS and T-SoS, both P < 0.05), whereas the progressive aerobic cardiovascular endurance run, vertical jump, speed at 20 m and 40 m were only favorably associated with T-SoS. For athlete girls, the association between handgrip (P = 0.03), vertical jump, and 4 × 10 m shuttle run (P < 0.05) with T-SoS was significantly related to a bone outcome. CONCLUSION: The handgrip test and vertical jump were associated with T-SoS in boys and girls independent of sport status. These results suggest that physical fitness is associated with bone health in adolescents, particularly boys, and that the relationship between physical fitness and bone may differ depending on sex and athletic status. CLINICAL RELEVANCE: Physical fitness tests are simple, easy-to-use tools for monitoring bone health and should be used by sport and health professsionals to promote healthy sport participation and prevent bone injuries.


Assuntos
Teste de Esforço/métodos , Aptidão Física/fisiologia , Rádio (Anatomia)/fisiologia , Esportes/fisiologia , Tíbia/fisiologia , Adolescente , Densidade Óssea/fisiologia , Criança , Estudos Transversais , Feminino , Força da Mão , Humanos , Masculino , Rádio (Anatomia)/diagnóstico por imagem , Fatores Sexuais , Tíbia/diagnóstico por imagem , Ultrassonografia
15.
J Sports Sci ; 38(20): 2390-2395, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32602402

RESUMO

The purpose of the present study was to compare the myosin heavy chain (MHC) isoform composition of the deltoid and vastus lateralis muscles of the dominant and non-dominant limbs in handball players. Eleven male Greek elite handball players (age 22.6 ± 1.9 yrs, training experience 10.6 ± 2.1 yrs, height 184.1 ± 4.1 cm, and weight 81.0 ± 12.5 kg) participated in the study. Four muscle biopsies were obtained from the dominant and non-dominant deltoid and vastus lateralis muscles during the in-season period. The MHC composition was determined using SDS-PAGE. No significant difference was found between the dominant and non-dominant muscles; Deltoid muscle: MHC I [(95%CI = -1.22, 0.33), P = 0.228], MHC ΙΙa [(95%CI = -0.32, 1.59), P = 0.168] and MHC IIx [(95%CI = -1.49, 1.10), P = 0.749]; Vastus lateralis muscle: MHC I [(95%CI = -0.38, 0.63), P = 0.586], MHC ΙΙa [(95%CI = -0.50, 0.65), P = 0.783] and MHC IIx [(95%CI = -1.08, 0.42), P = 0.355]. The findings of the present study indicate that the greater use of the dominant limbs for throwing actions and body movements in handball do not lead to altered MHC isoform composition compared to the non-dominant limbs.


Assuntos
Músculo Deltoide/química , Cadeias Pesadas de Miosina/análise , Músculo Quadríceps/química , Esportes/fisiologia , Eletroforese em Gel de Poliacrilamida , Humanos , Masculino , Cadeias Pesadas de Miosina/química , Isoformas de Proteínas/análise , Adulto Jovem
16.
Artigo em Inglês | MEDLINE | ID: mdl-32674282

RESUMO

This study assesses the status of hydration and the acid-base balance in female handball players in the Polish Second League before and after simulated matches in both indoor (hall) and beach (outdoor) conditions. The values of biochemical indicators useful for describing water-electrolyte management, such as osmolality, hematocrit, aldosterone, sodium, potassium, calcium, chloride and magnesium, were determined in the players' fingertip capillary blood. Furthermore, the blood parameters of the acid-base balance were analysed, including pH, standard base excess, lactate and bicarbonate ion concentration. Additionally, the pH and specific gravity of the players' urine were determined. The level of significance was set at p < 0.05. It was found that both indoor and beach simulated matches caused post-exercise changes in the biochemical profiles of the players' blood and urine in terms of water-electrolyte and acid-base balance. Interestingly, the location of a simulated match (indoors vs. beach) had a statistically significant effect on only two of the parameters measured post-exercise: concentration of calcium ions (lower indoors) and urine pH (lower on the beach). A single simulated game, regardless of its location, directly affected the acid-base balance and, to a smaller extent, the water-electrolyte balance, depending mostly on the time spent physically active during the match.


Assuntos
Equilíbrio Ácido-Base , Esportes , Equilíbrio Hidroeletrolítico , Bicarbonatos , Feminino , Humanos , Concentração Osmolar , Esportes/fisiologia , Adulto Jovem
18.
J Sports Sci ; 38(19): 2208-2214, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32516095

RESUMO

Despite the importance of technique and tactics for athlete performance, there has been surprisingly little research on the value of these skills in talent identification and development. This study investigated the relationship between coaches' early notational analyses of female youth handball players and the long-term success of these athletes. Participants included sixty-eight female handball players involved in a talent selection camp in Germany when they were between 12 and 14 years of age (mean = 14.42, SD = 0.42). All subsequently ended up as non-, semi- or professional adult players. During the initial selection camp, participants were evaluated on a range of quantitative and qualitative measures of technical and tactical skill. Results indicated significant differences between the groups, but only for the number of actions taken, not for the quality of those actions. While this seems counterintuitive, it may reflect the likelihood that more skilled and/or talented players take more actions. Further work is necessary to explore the validity and implications of these findings.


Assuntos
Desempenho Atlético/fisiologia , Tutoria , Destreza Motora/fisiologia , Esportes/fisiologia , Adolescente , Adulto , Aptidão , Criança , Feminino , Seguimentos , Alemanha , Humanos
19.
Phys Ther Sport ; 44: 92-98, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32497989

RESUMO

BACKGROUND: Weakness of the shoulder external rotators (ER) is one of the main risk factors for shoulder pain in handball. Short, effective shoulder ER strength programs the players will adhere to are lacking. OBJECTIVES: to develop a short and effective shoulder ER strength program, handball players will adhere to. METHODS: We conducted a modified Delphi study, including experts in the field of shoulder, strength training and handball. In the first round, the experts were asked to rate eight pre-defined shoulder ER exercises on efficacy and adherence and to suggest other preferred exercises. In round two, they were asked to rate the new exercises from round one. In round three, they received a statistical summary of the panels scores, their own score and a summary of the suggestions. Based on the feedback, the experts were asked to revise their response. RESULTS: Sixteen experts completed three rounds with 100% response rate. Twenty-eight exercises were rated. We reached consensus for both efficacy and adherence for two exercises, ER in 90° abduction in a bent-over squat position and ER in 90° abduction combined with horizontal abduction and trunk rotation in a push-up position. CONCLUSION: We reached consensus for both efficacy and adherence for two exercises.


Assuntos
Técnica Delfos , Terapia por Exercício/métodos , Postura/fisiologia , Lesões do Ombro/fisiopatologia , Articulação do Ombro/fisiologia , Esportes/fisiologia , Humanos , Masculino , Treinamento de Resistência , Fatores de Risco
20.
Phys Ther Sport ; 44: 143-150, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32512505

RESUMO

OBJECTIVE: To examine the proportion of skeletally immature anterior cruciate ligament reconstructed (ACLR) patients who achieve ≥90% of lower extremity recovery at 6-9 months post-operatively. DESIGN: Cross-sectional study. SETTING: Biomechanical laboratory. PARTICIPANTS: Skeletally immature ACLR patients. MAIN OUTCOME MEASURE(S): Muscular strength (quadriceps, hamstrings, hip abductors, and hip extensors), dynamic balance (anterior reach, posteromedial reach, and posterolateral reach), and functional hops tests (single hop, triple hops, cross-over hops, and 6 m timed hops) were examined. The primary outcome variable was the proportion of the study patients whose limb symmetry index (LSI) were ≥90% during return to sport (RTS) tests. RESULTS: A total of 105 skeletally immature ACLR patients who are planning to return to sporting activities (age: 13.4 ± 1.4 years) were enrolled. The proportion of skeletally immature ACLR patients who achieved ≥90% of LSI in all four strength, three balance, and four hop tests were 20.0%, 65.4%, and 27.8%. In those who completed all test battery (72/105), only 4.2% of skeletally immature ACLR patients demonstrated ≥90% of LSI in all RTS tests. CONCLUSION: A small proportion of skeletally immature ACLR patients demonstrated ≥90% of lower extremity recovery approximately at 7 months following ACLR.


Assuntos
Lesões do Ligamento Cruzado Anterior/reabilitação , Reconstrução do Ligamento Cruzado Anterior/métodos , Músculos Isquiossurais/fisiopatologia , Força Muscular/fisiologia , Músculo Quadríceps/fisiopatologia , Volta ao Esporte/fisiologia , Esportes/fisiologia , Adolescente , Lesões do Ligamento Cruzado Anterior/fisiopatologia , Lesões do Ligamento Cruzado Anterior/cirurgia , Estudos Transversais , Feminino , Seguimentos , Humanos , Masculino , Período Pós-Operatório , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA