Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 13 de 13
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Artigo em Inglês | MEDLINE | ID: mdl-34210088

RESUMO

Elite judo athletes undergo vigorous training to achieve outstanding results. In pursuit of achieving competitive success, the occurrence of injuries amongst judo athletes is not rare. The study aimed to perform a knee flexors and extensors isokinetic torque analysis in elite female judo athletes. Fifty-eight elite female judo athletes of the Serbian national team (21.02 ± 3.11 years; 62.36 ± 11.91 kg, 165.04 ± 10.24 cm, training experience 12.72 ± 2.98 years) volunteered to participate in this study. The range of motion (ROM) was set at 90°. Testing was performed in a concentric-concentric mode for the testing speed of 60 °/s. Five maximal voluntary contractions of knee extensors and knee flexors muscle groups were measured for both legs. The obtained data showed a statistically significant difference in absolute torque values among different categories as heavier athletes demonstrated higher values. Post hoc analysis showed a significant difference between weight categories, as heavier athletes demonstrated higher values, while no significant differences in normalized torque values for different weight categories were observed. The implementation of new elements and training modalities may improve performance and prevent lateral asymmetry, thus reducing the risk of injury.


Assuntos
Força Muscular , Músculo Esquelético , Atletas , Feminino , Humanos , Joelho , Torque
2.
Front Psychol ; 12: 657652, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34122241

RESUMO

Background: The COVID-19 pandemic has changed the way we conduct daily life, as well as sports training and sports competitions. Given the stress produced by COVID-19, and the "bubble" safety measures for the World Sambo Championship, held in Novi Sad, from the 6th to the 8th of November, 2020, athletes might have experienced more stress than athletes normally would in non-pandemic conditions. Therefore, the current study aimed to create a psychological profile of sambo athletes participating in the Sambo World Championship and living in this condition. Methods: One-hundred-fifteen participants took part in the study, completing the Profile of Mood Scale (POMS), the Pittsburg Sleep Quality Index, the Perceived Stress Scale (PSS), and the Fear of COVID-19 Scale. A mediation model with Fear of COVID-19 predicting both stress level directly and stress level through mood disturbance was hypothesized. Gender differences were evaluated through t-test. Results: The results showed that the sample presented higher levels of stress but no problems in sleeping. In particular, data analysis confirmed an indirect effect of Fear of COVID on Perceived stress through mood disturbance (ß = 0.14, Z = 2.80, and p = 0.005), but did not have a significant impact on the direct effect (ß = -0.04, Z = -0.48, and p = 0.63). Gender differences emerged in the perceived stress level (t = -2.86, df = 114, and p = 0.005) and daytime dysfunction (t = -2.52, df = 114, and p = 0.01) where females scored higher than males for both aspects. Conclusion: The athletes participating to the World Sambo Championship experienced stress levels determined by the mood disturbance produced by the fear of the COVID-19 pandemic. Female athletes were more stressed and showed higher daytime dysfunction. The findings of the current study are useful to understand the psychological profile of the athletes competing in the "bubble" conditions during COVID-19 pandemic.

3.
Medicina (Kaunas) ; 57(6)2021 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-34072641

RESUMO

Even though scientific literature shows numerous heath complications and performance decrements associated with rapid weight loss (RWL), its prevalence remains exceedingly high across various combat sports. The aim of this study was to thoroughly search the existing literature to explore the influence of RWL on kidney function in Olympic and non-Olympic combat sport athletes. PubMed and Web of Science were searched for the relevant studies. Only original articles published from 2005 onwards, written in English, that included healthy males and females who prompted ~5% weight loss within a week or less, were included in the study. Retrieved studies showed that creatinine, blood urea nitrogen and urine specific gravity values were significantly increased after RWL in the majority of the included studies. This observation indicates that RWL caused dehydration and subsequent acute kidney damage despite various degrees of weight lost during the RWL phase, which can lead to adverse events in other body systems. Alternative methods of weight reduction that prioritize athletes' health should be considered.


Assuntos
Artes Marciais , Perda de Peso , Atletas , Peso Corporal , Feminino , Humanos , Rim , Masculino
4.
BMC Sports Sci Med Rehabil ; 13(1): 39, 2021 Apr 14.
Artigo em Inglês | MEDLINE | ID: mdl-33853685

RESUMO

BACKGROUND: Rapid weight loss (RWL) is commonly practiced in combat sports. Both magnitude and methods used to induce RWL are largely similar among combat sports, but currently, there is no data on RWL methodology used by sambo athletes. Therefore, the aim of this study was to determine RWL procedures sambo athletes apply to lose weight rapidly. METHODS: The sample consisted of 199 participants, of which 132 males and 67 females who participated in the World Sambo Championship 2020 held in Novi Sad, Serbia. Each participant received RWL questionnaire that was available in multiple languages, and every participant was instructed how to fill it out. RESULTS: Almost 87% of sambo participants declared to have intentionally cut their weight prior to the competition, whereby 5.27 kg (SD: ±7.57) was lost. Gradual dieting, sauna use and skipping meals were the most dominant methods used to reduce weight prior to competition while more extreme methods of RWL such as the use of laxatives, diuretics, diet pills and vomiting were also implemented but by much smaller fragment of the participants involved. CONCLUSIONS: Findings from our study largely match with previously conducted RWL studies in terms of prevalence, magnitude and methods used by combat sport athletes, especially in judo and wrestling. Knowing the hazardous consequences of RWL, alternative methods of sustainable weight loss should be considered.

5.
Nutrients ; 13(4)2021 Mar 25.
Artigo em Inglês | MEDLINE | ID: mdl-33805862

RESUMO

BACKGROUND: Like other combat sports, sambo has competition rules that divide athletes into categories based on gender, age and weight. Athletes in combat sports often resort to rapid weight loss (RWL) methods to be more competitive in lower weight categories and gain an advantage against lighter, smaller and weaker competitors. The aim of this study was to examine the methodology implemented by two different sambo age categories, junior and senior athletes, in order to attain RWL. METHODS: The sample consisted of 103 male sambo elite athletes (seniors/juniors: age 28.5 ± 4.3/18.9 ± 0.8; height (m): 1.7 ± 0.1/1.8 ± 0.1; weight (kg): 76.3 ± 17.8/74.4 ± 16.3; BMI (kg/m2): 25.0 ± 3.8/23.7 ± 3.9) who completed a survey on RWL. RESULTS: Athletes reported losing a mean of 5 kg starting approximately 12 days before a competition. The most common methodology reported by senior and junior sambo athletes was gradually increasing dieting, followed by sauna and plastic suit training. Less common methods adopted were laxatives, diuretics, the use of diet pills and vomiting. There were significant group differences for sauna and diet pill ingestion. Coaches and parents are influential people in the lives of athletes concerning the weight loss strategy to be adopted. CONCLUSIONS: This study's results unequivocally confirm the prevalent practice of RWL in both senior and junior sambo athletes. Although athletes prevalently chose "less harmful" methods, there is a need to inform parents and coaches of the risks and benefits of RWL.


Assuntos
Atletas/estatística & dados numéricos , Artes Marciais/estatística & dados numéricos , Perda de Peso , Adolescente , Adulto , Fatores Etários , Diuréticos/administração & dosagem , Humanos , Laxantes/administração & dosagem , Masculino , Banho a Vapor/estatística & dados numéricos , Inquéritos e Questionários , Tempo , Vômito
6.
Int. j. morphol ; 38(5): 1244-1249, oct. 2020. tab, graf
Artigo em Inglês | LILACS | ID: biblio-1134432

RESUMO

SUMMARY: The objective of this research was to establish the anthropometric characteristics and somatotype profiles of Montenegrin male and female judokas, divided by weight categories. The sample was composed of 170 Montenegrin judokas, 92 male judo athletes (21.8 ± 3.9 years) and 78 female judo athletes (20.5 ± 3.1 years). All athletes were of national level, divided by official weight categories. This study provides normative data of anthropometric and somatotype profiles in relation to gender and weight categories of Montenegrin judo athletes. The anthropometric profiles changed according to weight category, whereas, anthropometric parameters were highest in the heaviest category as compared to other weight categories. In the domain of male somatotype profiles, three different types of somatotype in relation to weight category were obtained. The three weight categories were endomorphic mesomorphs (-90 kg, -100 kg, >100 kg), ectomorphic mesomorphs (-60 kg, -73 kg, -81 kg) and judo athletes of -66 kg were mesomorphic ectomorphs. All the female athletes were endomorphic mesomorphs, except for category 52. Representatives from the -52 kg were mesomorphic endomorphs. This study highlights how somatotype profiles of national judo athletes differ between weight categories. It is likely that some changes could be used in applying proper training methods with a focus on the athletes' physical abilities, which could result in a decrease in somatotype diversity among weight categories.


RESUMEN: El objetivo de esta investigación fue establecer las características antropométricas y los perfiles somatotípicos de judokas Montenegrinos de ambos sexos, divididos por categorías de peso. La muestra estuvo compuesta por 170 judokas montenegrinos, 92 hombres (21,8 ± 3,9 años) y 78 mujeres (20,5 ± 3,1 años). Todos los atletas eran de nivel nacional, divididos por categorías de peso oficiales. Este estudio proporcionó datos normativos de perfiles antropométricos y somatotipos en relación con las categorías de sexo y peso de los atletas de judo Montenegrinos. Los perfiles antropométricos cambiaron según la categoría de peso, mientras que los parámetros antropométricos fueron más altos en la categoría más pesadas en comparación con otras categorías. En el dominio de los perfiles de somatotipo masculino, se obtuvieron tres tipos diferentes en relación con la categoría de peso. Las tres categorías fueron mesomorfos endomórficos (-90 kg, -100 kg, > 100 kg), mesomorfos ectomórficos (-60 kg, -73 kg, -81 kg) y ectomorfos mesomórficos (-66 kg). Todas las atletas femeninas fueron mesomorfas endomórficas, excepto la categoría 52. Los representantes de los -52 kg eran endomorfos mesomórficos. Este estudio destaca cómo los perfiles de somatotipo de los atletas nacionales de judo difieren entre las categorías de peso. Es probable que puedan aplicarse algunos cambios en los métodos de entrenamiento, con un enfoque en las habilidades físicas de los atletas, lo que podría resultar en una disminución en la diversidad de somatotipos entre las categorías de peso.


Assuntos
Humanos , Masculino , Feminino , Adulto Jovem , Somatotipos , Antropometria , Artes Marciais , Pregas Cutâneas , Peso Corporal , Montenegro
8.
Nutrients ; 12(5)2020 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-32357500

RESUMO

Rapid weight loss (RWL) is commonly practiced among judo athletes. Although it helps them to gain the advantage over their lighter opponents, previous studies have shown that RWL can have a negative impact on the athlete's performance and overall well-being. This systematic review aimed to synthesize the evidence that examines the influence of rapid weight loss on physiological parameters, biomarkers, and psychological well-being in judo athletes. We followed the preferred reporting items for systematic reviews and meta-analyses guidelines. We searched for studies on Web of Science and PubMed that elaborate on the influence of ≥5% RWL achieved over ≤7-day period in judokas. Out of 52 studies initially found, 14 studies met our eligibility criteria and were included in the review. In total, we examined data from 1103 judo athletes. Retrieved studies showed conflicting data concerning physiological parameters and biomarkers, while psychological well-being parameters were more consistent than physiological and biomarkers. The feeling of tension, anger, and fatigue significantly increased while a decrease in vigor was demonstrated among athletes who lost weight rapidly. The evidence on the impact of RWL on performance remains ambiguous. More studies under standardized conditions are needed in order to provide firm evidence. Considering the harmful effects of RWL outlined in the existing literature, it is important to determine and monitor athlete's minimal competitive weight to prioritize the health and safety of the athlete, emphasize fairness, and ultimately benefit the sport.


Assuntos
Atletas/psicologia , Desempenho Atlético/fisiologia , Desempenho Atlético/psicologia , Artes Marciais/fisiologia , Artes Marciais/psicologia , Perda de Peso , Programas de Redução de Peso/métodos , Adulto , Ira , Fadiga , Humanos , Masculino , Estresse Psicológico , Fatores de Tempo , Adulto Jovem
9.
J Transl Med ; 18(1): 142, 2020 03 30.
Artigo em Inglês | MEDLINE | ID: mdl-32228627

RESUMO

OBJECTIVE: To observe the effect of rapid weight loss (RWL) methods over 3 days on muscle damage in judokas. METHODS: Eighteen judokas participated in this crossover study, meaning that judo athletes were subjected to exercise-only phase (4 days) and RWL phase (3 days). Subjects were tested for myoglobin, creatine kinase, aldolase, hemoglobin, and hematocrit values on seven consecutive days. These biomarkers served as indicators of acute muscle damage. RESULTS: During the exercise-only phase, no significant changes were observed. Myoglobin (Mb) (p < 0.001), creatine kinase (CK) (p < 0.001) and aldolase (ALD) (p < 0.001) significantly increased only during the RWL phase, as well as hemoglobin (Hb) (p < 0.001) and hematocrit (Hct) (p < 0.005) values. It was detected that peak values for muscle damage biomarkers were reached on the sixth day, while Hct and Hb values were the highest on the seventh day of the study. CONCLUSION: Our study showed significant muscle damage induced by RWL. The prevalence of RWL use by judokas is high but firm scientific evidence is lacking in the evaluation of the current practice of it. Therefore, further knowledge must be gained to evaluate the effectiveness of RWL on performance and its impact on judokas' wellbeing.


Assuntos
Artes Marciais , Perda de Peso , Atletas , Estudos Cross-Over , Humanos , Músculo Esquelético
10.
Medicine (Baltimore) ; 99(3): e18819, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32011492

RESUMO

The objectives of this research were to establish somatotype and hand-grip strength between elite cadet male and female sambo athletes divided by weight categories.A total of 97 elite cadet sambo athletes, participants of the World Cadets Sambo Championships 2018 participated in the study. Male and female sambo athletes were divided by official weight categories. Anthropometrical variables were taken in order to calculate somatotypes and hand-grip strength. A one-way analysis of variance and Tukey's post hoc tests were used to compare group differences by weight categories.Results of this study provide the first description of somatotype and hand-grip strength of elite male and female cadet sambo athletes in relation to weight category. A typical somatotype in male sambo athletes was endomorphic mesomorphs with a predominance of musculoskeletal tissue, while female athletes differed concerning weight category. Overall, an increase in handgrip strength across weight categories was noted. Hand-grip strength increases linearly from the lightest to the heaviest weight category except in -66 and -84 kg in male athletes. Differences in handgrip strength of female athletes were detected between the lightest group and last six groups in all three variables in favor of last six as well as -44 and kg -48 kg compared with the heaviest.To the best of our knowledge, this study provides the first normative data of somatotype and hand-grip strength analyses in relation to age, gender, and weight categories of cadet sambo athletes. The anthropometric profile of sambo athletes changed according to their weight category. Mesomorphy was the most dominant somatotype component in male athletes, while female had three different types of somatotype component in relation to weight category. In conclusion, we found differences in hand-grip strength related to weight category, which can be linked to the muscle mass of athletes. Future studies should focus on somatotype and strength handgrip values of international compared to national level sambo athletes.


Assuntos
Atletas , Força da Mão/fisiologia , Artes Marciais , Somatotipos , Adolescente , Antropometria , Estudos Transversais , Feminino , Humanos , Masculino , Valores de Referência
12.
Appl Physiol Nutr Metab ; 41(10): 1100-1103, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27690568

RESUMO

We evaluated the effects of exercise on circulating concentrations of guanidinoacetic acid (GAA) and creatine in 23 healthy volunteers subjected to running to exhaustion and free-weight bench-press to volitional failure. Blood was taken before and following each exercise session. Running induced a significant decrease in serum GAA by 20.1% (P < 0.001), while free-weight exercise reduced GAA by 11.7% (P < 0.001), suggesting the possible use of serum GAA as a novel biomarker of exhaustion.

13.
Coll Antropol ; 37 Suppl 2: 171-7, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23914505

RESUMO

The aim of the present study was to analyze differences in motor and cognitive abilities of children depending on their value in quantitative indicators of Body Mass Index (BMI) and subcutaneous fatty tissue. The study sample consisted of overall 910 boys and girls, aged 11 to 14, all from elementary schools in Vojvodina (Serbia). Six anthropometric, eight motor and one cognitive variable were analyzed to identify quantitative and qualitative differences in motor and cognitive functioning of children. Children were divided into three groups within gender based on their body mass index calculated and subcutaneous fatty tissue measured. The results obtained from the study indicate the existence of differences in motor and only partly in intellectual abilities between groups of subjects. The greatest differences between the clusters were found in the level of coordination of the entire body, and the static strength of arms and shoulders.


Assuntos
Desenvolvimento do Adolescente/fisiologia , Índice de Massa Corporal , Desenvolvimento Infantil/fisiologia , Cognição/fisiologia , Destreza Motora/fisiologia , Gordura Subcutânea/fisiologia , Adolescente , Criança , Feminino , Humanos , Masculino
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...