12 research outputs found

    Efeito do destreinamento sobre variáveis cinemáticas relacionadas ao desempenho do nado crawl com diferentes estratégias de respiração

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    Sabe-se que o destreinamento acarreta em perda das adaptações do sistema cardiorrespiratório e neuromuscular adquiridas com o treinamento físico, inclusive na natação. Apesar de diversos estudos terem investigado o efeito do destreinamento do ponto de vista fisiológico, ainda não foi encontrado na literatura estudos que tenham investigado o efeito do destreinamento em variáveis cinemáticas durante o nado. Sabendo disso esse trabalho foi desenvolvido com objetivo de verificar se há efeito do destreinamento sobre variáveis cinemáticas no desempenho do nado crawl com diferentes estratégias de respiração. Para isso foi utilizada uma metodologia baseada em cinemetria para obter as variáveis cinemáticas (tempo do nado, velocidade média do nado, frequência de braçada, comprimento de braçada e velocidade de braçada) em diferentes estratégias de respiração (apneia voluntaria, respiração unilateral para o lado preferido, respiração unilateral para o lado não preferido e respiração bilateral) durante o nado crawl, antes e depois do período de destreinamento. Os dados mostraram que após cinco semanas de destreinamento o tempo do nado aumentou significativamente, a velocidade média do nado e a frequência de braçada diminuiram significativamente, exceto na estratégia de respiração bilateral. Ainda foi percebido que o tempo de braçada aumentou significativamente e a velocidade de braçada diminuiu significativamente na estratégia de apnéia voluntária e respiração para o lado preferido, por outro lado o comprimento de braçada aumentou significativamente apenas na estratégia de respiração para o lado preferido. Portanto esses achados indicam que há efeito prejudicial do destreinamento sobre variáveis cinemáticas relacionadas ao desempenho do nado crawl com diferentes estratégias de respiraçãoIt is known that detraining leads to the loss of cardiorespiratory and neuromuscular systems adaptations, once acquired with physical training, including swimming. Although several studies have been investigated the effect of detraining, through a physiological concept, it have not yet been found in the literature a study that have investigated the effect of detraining in kinematic variables during swimming. Knowing that, this work was developed in order to verify the detraining effect on kinematic variables in front crawl stroke performance with different breathing patterns. For this, we used a methodology based on video analysis for kinematic variables (swim time, stroke velocity, stroke rate, stroke length and hand velocity) in different breathing patterns (no breathing, breathing to the preferred side, breathing to the non-preferred side and bilateral breathing) during front crawl stroke, before and after the detraining period. The data showed that, after five weeks of detraining the swim time was increased, the swim velocity and stroke rate was lower, except for bilateral breathing. Although, the stroke time was increased and stroke velocity was lower in no breathing pattern and breathing to the preferred side, on the other hand, the stroke length was increased just in breathing to the preferred side. Therefore, these findings indicate that there are adverse effects of detraining on kinematic variables related to swimming front crawl stroke perfomance with various breathing patter

    Village characteristics and health of rural Chinese older adults: Examining the CHARLS Pilot Study of a rich and poor province

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    Community (or village) characteristics have received growing attention as researchers have sought factors affecting health. This study examines the association between a variety of environmental, economic, and social village characteristics and health of Chinese older rural adults with health measured in terms of physical limitations. The Chinese Health and Retirement Longitudinal Survey (CHARLS) Pilot Study data were used. Older villagers from a low-income province (Gansu) and a relatively wealthy province (Zhejiang) were surveyed between July and September, 2008. The sample included 1267 respondents in 73 villages age 45 and older. The relationship between a variety of village characteristics and physical limitations of older adults was examined using negative binomial regression (NBR) with standard errors a djusted to account for non-independence of respondents in a village. A comparison of means/percentages shows that Gansu and Zhejiang were significantly different on the dependent and most independent variables. The NBR models show that at the personal-level, decreased risk of physical limitations was associated with being male, less than 60 years old, married, higher in education, and higher in household expenditures (proxy for income). At the village-level, decreased risk of limitations was associated with a continuous supply of electricity, not using coal in the household, the existence of a sewage system, low cost of electricity, and village wealth. Decreased risk of physical limitations was also associated with various characteristics of China's New Cooperative Medical Scheme (NCMS), an insurance program for rural older adults. Policy implications for improved health of rural older adults include: (1) continued use of China's NCMS, (2) establishment of village sewage systems, (3) ending the use of coal in the home, and (4) increased educational opportunities focused on health. © 2013 Elsevier Ltd.Link_to_subscribed_fulltex
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