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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Getting 'Up' for the Meet: A Sociological Analysis of Drug Usage in the Sport of Olympic Weightlifting

Cooney, Douglas C. 01 January 1975 (has links) (PDF)
No description available.
2

Efeito do treinamento com diferentes intensidades do exercício \"hang power clean\" no desempenho motor e na potência muscular de jogadoras de handebol / Effects of hang power clean training with different intensities on motor performance and muscular power of handball players

Silva, Claudio Machado Pinto e 20 February 2019 (has links)
O desenvolvimento da potência muscular e das habilidades motoras como salto vertical, velocidade de corrida e agilidade é fundamental para um bom desempenho nas modalidades esportivas coletivas, dentre elas o handebol. Os exercícios do levantamento de peso olímpico (LPO), dentre eles o hang power clean (HPC), têm sido comumente utilizados para esta finalidade; porém, pouco se sabe a respeito do efeito de diferentes intensidades de treinamento com o HPC sobre o desempenho motor de atletas. Desta forma, o objetivo do estudo foi investigar o efeito de dois protocolos de treinamento com 50% e 90% 1RM no exercício HPC nos ganhos de potência muscular dos membros inferiores, na altura do salto vertical, na velocidade de corrida, na mudança de direção e na força dinâmica máxima de jogadoras de handebol. Dezesseis atletas das categorias júnior e adulto foram divididas em dois grupos (LPO50 e LPO90; 50% e 90% 1RM, respectivamente) e submetidas a 15 sessões de treinamento durante sete semanas. Testes de potência muscular dos membros inferiores, altura do salto vertical sem e com contra-movimento (SJ e CMJ, respectivamente), velocidade de corrida, mudança de direção e força dinâmica máxima (1RM) nos exercícios meio-agachamento e HPC foram realizados pré- e pós-treinamento. Após o período de treinamento foi observado aumento significante da potência de membros inferiores no CMJ com 40% da massa corporal (MC) somente para o grupo LPO90, enquanto nenhuma alteração significante ocorreu no CMJ 60% e 80% MC para ambos os grupos. Não foram observadas alterações significantes na altura dos saltos verticais (SJ, CMJ e CMJ com diferentes sobrecargas externas) para os dois grupos; porém, a velocidade de corrida nas distâncias 0-5, 0-20 e 0-30m aumentou de forma significante e semelhante entre LPO50 e LPO90. Houve diminuição significante no desempenho da mudança de direção no teste T-40 para ambos os grupos. A 1RM no exercício HPC aumentou para os dois grupos enquanto nenhuma alteração significante foi observada para o exercício meio-agachamento. Assim, após 15 sessões de treinamento com HPC em diferentes intensidades (50% vs. 90% 1RM), pode-se afirmar que a utilização de menores intensidades promoveu adaptações positivas muito similares à utilização de maiores intensidades na velocidade de corrida e na força dinâmica máxima no exercício HPC, em jogadoras de handebol / The development of muscle power and motor skills such as vertical jump, running speed and agility is fundamental for a good performance in several team sports, among them handball. Olympic weightlifting (OWL) exercises such as the hang power clean (HPC) have been commonly used for this purpose; however, little is known about the effect of different training intensities with HPC on athletes\' motor performance. Thus, the objective of the study was to investigate the effect of two training protocols with 50% and 90% 1RM of the HPC exercise on lower limbs muscle power, vertical jump height, running speed, agility, and maximum dynamic strength of female handball players. Sixteen junior and adult athletes were divided into two groups (OWL50 and OWL90, 50% and 90% 1RM, respectively) and underwent 15 training sessions for seven weeks. Test for lower limbs muscle power, squat jump and countermovement jump height (SJ and CMJ, respectively), running velocity, agility, and maximal dynamic strength (1RM) in half-squat and HPC exercises were performed pre- and post-training. After the training period, a significant increase in lower limbs power in the CMJ was observed with 40% of body mass (BM) only for the OWL90 group, while no significant alteration occurred in the CMJ 60% and 80% BM for both groups. No significant changes were observed in vertical jumps height (SJ, CMJ and CMJ with different external loads) for both groups; however, running speed at 0-5, 0-20 and 0-30m increased significantly and similarly between OWL50 and OWL90. There was a significant decrease in agility performance for both groups. The 1RM in the HPC exercise increased for both groups while no significant change was observed for the half-squat exercise. Thus, after 15 training sessions with HPC at different intensities (50% vs. 90% 1RM), it can be stated that the use of lower intensities promoted positive adaptations in running speed and maximum dynamic strength in the HPC exercise similar to the use of higher intensities, in handball players
3

Análise comparativo da execução técnica do Levantamento de Peso Olímpico entre praticantes com e sem experiência / Not informed by the author

Noriega, Carlos Enrique Lopez 27 March 2019 (has links)
O desempenho geral de um atleta está diretamente relacionado com o desenvolvimento da potência muscular, sendo esta a maior característica dos praticantes do Levantamento de peso olímpico (LPO), daí a sua utilização em diferentes planejamentos esportivos em procura do melhoramento do desempenho e potência muscular. Os movimentos do LPO recrutam os maiores grupos musculares e requerem intensos esforços físicos realizados com ênfase na velocidade e técnica. Velocidade, coordenação, níveis de coativação muscular são características dos movimentos próprios do Levantamento de Peso Olímpico e que são adquiridos e aperfeiçoados no tempo. O Power Snatch (PS) é um movimento derivado do Arranco, considerado como um dos movimentos mais difíceis de executar pela sua complexidade técnica. O PS é utilizado em diferentes modalidades esportivas em procura de elevar o desempenho atlético. Estudos prévios registraram dados cinemáticos e/ou medições eletromiográficas, mas sempre foram com atletas de alto rendimento. O presente estudo investigou os padrões cinemáticos e atividades musculares que representariam a execução técnica do PS e comportada por uma trajetória ótima observada desde o plano sagital do executante. Dezenove voluntários participaram do estudo, 11 sujeitos foram treinados (GT) durante 6 semanas e a cada duas semanas as variáveis cinemáticas e de atividade muscular foram registradas. 8 especialistas (GE) em levantamento participaram para registrar suas execuções técnicas. O PS foi dividido em 6 fases, representadas por 48 variáveis que comportam a análise cinemática por cada sujeito divididos em 3 sessões. 16 variáveis representaram dados da trajetória do GE. 8 músculos, correspondentes ao lado dominante de cada sujeitos foram registrados. Os dados cinemáticos e de atividade muscular foram analisados e comparados. Foram identificados parâmetros que comportam a trajetória óptima da barra e das atividades musculares nas diferentes fases da execução técnica do PS. O GT mostrou mudanças na sua execução, sendo que algumas delas se aproximaram aos do GE. Os coeficientes de ativação muscular foram maiores no GT que no GE. Os resultados do presente estudo levantam a questão da possibilidade de que a trajetória ótima no PS existe, mas varia entre os diferentes executantes / The performance of an athlete is directly related to the development of muscular power, this being the main characteristic of the Olympic Weightlifting (OW) practitioners. Hence their use in different training plans in order to improve performance and muscular power. The OW movements recruit the largest muscle groups and require intense physical effort performed with emphasis on speed and technique. Speed, coordination, levels of muscular coactivation are characteristic of the movements of the Olympic Weightlifting themselves and are acquired and improved over time. Power Snatch (PS) is a movement derived from the Snatch, considered as one of the most difficult movements to perform due to its technical complexity. The PS is used in different sports modalities in order to increase athletic performance. Previous studies have recorded kinematic data and/or electromyographic measurements, but these studies were limited to elite athletes. The present study investigated the kinematic patterns and muscular activities that represent the technical execution of the PS, referred by an optimal trajectory observed from the sagittal plane of the performer. Nineteen volunteers participated in the study, 11 subjects were trained (GT) for 6 weeks and every two weeks the kinematic and muscle activity variables were recorded. 8 specialists in ow training (GE) participated to register their technical executions. The PS was divided into 6 phases, represented by 48 variables that involve the kinematic analysis for each subject divided into 3 sessions. 16 variables represented GE trajectory data. 8 muscles, corresponding to the dominant side of each subject were recorded. Kinematic and muscle activity data were analyzed and compared. Parameters were identified that include the optimal trajectory of the bar and muscular activities in the different phases of the PS technical execution. The GT showed changes in its execution, with some of them approaching those of GE. The muscle activation coefficients were higher in the GT than in the EG. The results of the present study raise the question of the possibility that the optimal trajectory in PS exists, but varies among the different performers
4

The Double Knee Bend- Characteristics and Coaching Points

Cedar, William E.S., Hornsby, W. Guy, Mizuguchi, Satoshi, Stone, Michael H. 01 September 2019 (has links)
Excerpt:The purpose of this article is to present and discuss the phases of the pull that precede the power position, as well as present some suggestions for how to coach these positions...
5

Psykologin bakom skadeprevention inom tyngdlyftning, styrkelyft, Crossfit och kroppsbyggning. : En Kvalitativ studie ur coachers perspektiv

Björk, Anders, Haag, Jonathan January 2015 (has links)
Huvudsyftet med föreliggande studie var att undersöka på vilket sätt coacher inom tyngdlyftning, styrkelyft, Crossfit och kroppsbyggning implementerar preventiva strategier designade för att förebygga skador genom inverkan på psykologiska riskfaktorer. Vidare var det av intresse att undersöka vilka personlighetsdrag hos en idrottare som coacher upplevde ökade risken för skador. Ett ytterligare syfte var att studera coachernas erfarenheter av relationen mellan idrottares stressnivå och skaderisk. Totalt genomfördes nio semistrukturerade intervjuer med coacher på distrikt till internationell nivå lokaliserade i Sverige. Samtliga coacher hade tidigare erfarenhet med skadade idrottare. Resultatet sammanställdes genom en deduktiv innehållsanalys. Under intervjuerna identifierades flera interventionsstrategier som kunde relateras till Williams och Andersens (1998) stress­skademodell. Det framgick att coacherna i studien fokuserar mycket på fysiologiska och stressrelaterade aspekter och inte personlighetsdrag när de implementerar interventioner för att förebygga skador. Implikationer för skadeförebyggande träning samt förslag på framtida forskning ges.
6

The Power Position: Characteristics and Coaching Points

Stone, Michael H., Hornsby, W. Guy, Cedar, William E.S., Mizuguchi, Satoshi 01 August 2018 (has links)
Excerpt:The power position is an integral position for a variety of power lifting movements. Athletes can develop their power position via an integrated approach involving sound exercise selection and purposeful instruction leading to enhanced strength and technique...
7

Kroppsuppfattning och dess relation till tyngdlyftares och styrkelyftares upplevelse av att tävla i en viktklassidrott : En nationell enkätundersökning / Body image and its relation to weightlifters’ and powerlifters’ experience of competing in a weight class sport : A Swedish survey

Nyström, Lisa January 2023 (has links)
Kroppsuppfattning påverkar vår livskvalitet. Utöver att prestera på tävling behöver tyngdlyftare och styrkelyftare delta på en invägning, där deras kroppsvikt avgör vilken viktklass de tävlar i. Syftet med studien var att undersöka om det fanns ett samband mellan lyftares kroppsuppfattning och upplevelse av att vara aktiv och tävlande inom tyngdlyftning och/eller styrkelyft. Metod: 210 svenska tyngdlyftare och styrkelyftare med tävlingserfarenhet i åldrarna 15–70 år deltog i studien. Deltagarna svarade på en digital enkät som inkluderade ett av författaren nyskapat instrument om förekomst av beteenden och upplevelser av att tävla i en viktklassidrott, samt Body Esteem Scale for Adolescents and Adults om kroppsuppfattning. Resultat: Signifikant positiva korrelationer av måttlig styrka påvisades mellan kroppsuppfattning och tävlingsupplevelse, samt mellan kroppsuppfattning och viktupplevelse. Svag positiv korrelation påvisades mellan kroppsuppfattning och invägningsupplevelse. 60 % av studiedeltagarna rapporterade positiv kroppsuppfattning och 40 % rapporterade blandad/splittrad eller negativ kroppsuppfattning. Slutsats: Studiens resultat indikerar att kroppsuppfattning och upplevelse av att tävla, upplevelse av sin kroppsvikt och att tävla i viktklass(er), samt upplevelse av invägning har ett samband. Då 40 % av populationen rapporterade blandad/splittrad eller negativ kroppsuppfattning tyder resultaten på praktiska förbättringsmöjligheter där idrottares kroppsuppfattning kan förbättras. / Body image affects our quality of life. In addition to performing in competition, weightlifters and powerlifters need to participate in a weigh-in, where their body weight determines which weight class they compete in. The purpose of the study was to investigate whether there was a relationship between lifters’ body image and experience of being active and competing in weightlifting and/or powerlifting. Method: 210 Swedish weightlifters and powerlifters with competition experience aged 15–70 years participated in the study. The participants responded to a digital questionnaire that included an instrument newly created by the author on the prevalence of behaviours and experiences of competing in a weight class sport, as well as the Body Esteem Scale for Adolescents and Adults. Results: Positive correlations of statistical significance and of moderate strength were found between body image and competition experience, as well as between body image and weight experience. Weak positive correlation was demonstrated between body image and weigh-in experience. 60 % of the participants reported positive body image and 40 % reported mixed/split or negative body image. Conclusion: The results of the study indicate a relationship between body image and experience of competing, experience of one's body weight and competing in weight class(es), as well as experience of weigh-ins. As 40 % of the population reported mixed/split or negative body image, the results indicate practical opportunities where athletes’ body image can be improved.

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