Brain injuries in sports drew more and more public attentions in recent years. Brain injuries vary by name, type, and severity in the athletic setting. It should be noted, however, that these injuries are not isolated...Brain injuries in sports drew more and more public attentions in recent years. Brain injuries vary by name, type, and severity in the athletic setting. It should be noted, however, that these injuries are not isolated to only the athletic arena, as non-athletic mechanisms （e.g., motor vehicle accidents） are more common causes of traumatic brain injuries （TBI） among teenagers. Notwithstanding, as many as 1.6 to 3.8 million TBI result from sports and recreation each year in the United States alone. These injuries are extremely costly to the global health care system, and make TBI among the most expensive conditions to treat in children. This article serves to define common brain injuries in sport; describe their prevalence, what happens to the brain following injury, how to recognize and manage these injuries, and what you can expect as the athlete recovers. Some return-to-activity considerations for the brain-injured athlete will also be discussed.展开更多
The trajectory model of dispersed phase drops and the model of basic flow for drop motion between two inclined parallel plates are derived with the optimized calculation. The analytical results of direct numerical sim...The trajectory model of dispersed phase drops and the model of basic flow for drop motion between two inclined parallel plates are derived with the optimized calculation. The analytical results of direct numerical simulation indicate that the basic flow plays an important role in the drop coalescence on liquid-liquid interface. In the stratified two-phase flow field, the smaller droplets are difficult to drain the thin continuous film between the approaching droplets and bulk interfaces and eventually immerse into the trickling film to yield coalescence. They almost attain the velocity of their local surroundings. Moreover, the basic flow exerts a dominant influence on the motion of smaller droplet. The smaller droplets are easily entrained by the basic flow. On the contrary, the larger drop presents advantageous characteristics of coalescence due to its high velocity. The range of 0.3 mm < δR≤ 0.75 mm is the advantageous drop coalescence condition since the rapidly varied velocity and its first derivative theoretically cause the forces acting on a drop to become imbalanced. On the other hand, the thin layer of the continuous phase drained from the interval between the drops and trickling film should not be neglected in the calculation of shearing force since it is important for drop rotation. The drop rotation is an indispensable factor in coalescence.展开更多
Tujia Waving Dance, as an important part of culture, has drawn the attention of many scholars in sociology and ethnology and researched by them in recent years, with the results one after another. But from the perspec...Tujia Waving Dance, as an important part of culture, has drawn the attention of many scholars in sociology and ethnology and researched by them in recent years, with the results one after another. But from the perspective of sports and culture to observe and understand the Waving Dance, there are still not many learners and their analysis is limited to the discussions of the value of fitness and the recreational sports, but being ambiguous on the classification of the Waving Dance and its genes discussions, with some problems having big controversy. We can start from the basic shape of the Waving Dance to identify its dance category, to determine its basic factor, and to analyze the diversity value of the Waving Dance.展开更多
The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we c...The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we can see that in the era of leisure sports agricultural, civilization reflects a more casual game. Strictly speaking, leisure sport is a product of the birth of modern industrial civilization. But today, it has become a recreational sport entirely necessities of life, recreation is the ultimate ownership of human beings, but also one of the best state of human existence, and therefore we have reason to believe that in the near future, leisure Sports will bring a self-liberation and ultimate human freedom.展开更多
Background：Research has been conducted linking sports participation and health in childhood and adolescence;however,little is known about the contribution of sport to women＇s health.The purpose of this study was to ...Background：Research has been conducted linking sports participation and health in childhood and adolescence;however,little is known about the contribution of sport to women＇s health.The purpose of this study was to examine the relationship between sport and women＇s health in the USA by analyzing data from the Behavioral Risk Factor Surveillance System（BRFSS）.Methods：This study was a secondary data analysis of the 2013 national BRFSS survey.Unlike the BRFSS core component from previous years,in2013,participants were questioned extensively about their physical activity behaviors.Seventy-six different activities were identifie by the participants.Two researchers categorized the 76 activities as sport,conditioning exercise,recreation,or household tasks based on previously identifie categories.Logistic regression was utilized to calculate odds ratios and adjusted odds ratios for chronic diseases based on physical activity category.Results：Women who participated in sport had better health outcomes with significant y lower odds for all chronic diseases except asthma and better general health than women who participated in conditioning exercise,household tasks,or recreation,and many of the significan differences remained after controlling for demographic characteristics.Conclusion：Sport participation was associated with more positive health outcomes among women in the USA compared with the other categories.As a means to improve health of women,the USA could focus on efforts to increase sport participation among women.展开更多
Exercise affects muscle metabolism and composition in the untrained muscles. The proteome of muscle tissue will be affected by exercise and resting. This is of economic importance for pork quality where transportation...Exercise affects muscle metabolism and composition in the untrained muscles. The proteome of muscle tissue will be affected by exercise and resting. This is of economic importance for pork quality where transportation relates to exercise of untrained muscles. Rest reverses exercise effects. The objective of this research was to develop potential protein biomarkers that predict the optimal resting time after exercise related to optimal pork quality. Ten litters of four female pigs were within litter allocated to the four treatment groups： exercise by running on a treadmill for 27 minutes followed by rest for 0, 1, or 3 h; control pigs without exercise. Proteome profiles and biochemical traits measuring energy metabolism and meat quality traits expected to be related to exercise were determined in the Longissimus and the Biceps femoris of the pigs. The results indicated associations between protein abundances in muscles and exercise, resting, and biochemical traits.展开更多
Starting from the skill characteristics of ski tourism,this paper discusses the impact of consumer skill on travel decisions,and the moderating effect of the ski resort’s comprehensive leisure environment(including t...Starting from the skill characteristics of ski tourism,this paper discusses the impact of consumer skill on travel decisions,and the moderating effect of the ski resort’s comprehensive leisure environment(including the ski resort sports environment and the regional cultural tourism environment),in order to both understand their impacts on the travel distance characteristics of skiers and attempt to provide necessary research support for the development of China’s ski industry and the construction of destinations.Based on the data from multi-period visitor surveys,this paper constructs the consumption skill-travel radius decision-making influence model under the moderating effect of the ski resort comprehensive leisure environment.The results show three main characteristics.(1)The travel radius obviously differs among skiers with different skill levels.The skill level of skiers has a significant positive effect on the larger travel radius,and a significant negative effect on the smaller travel radius.That is,skiers with a higher skill level are more inclined to undertake long-distance skiing travel,while skiers with a lower skill level are more inclined to undertake short-distance skiing travel.(2)The comprehensive leisure environment has a significant moderating effect on the skiers’travel radius,with a significant positive impact on enlarging the travel radius,while the influences on high-skill and low-skill skiers are significantly higher than on middle-skill skiers.(3)In the comprehensive leisure environment,there are differences in the moderating effect of the ski resort sports environment and the regional cultural tourism environment on the skiers travel radius,and the positive moderating effect of the ski resort sports environment on the high-skill skiers’travel radius is more obvious.While the regional cultural tourism environment has a more obvious positive moderating effect on the travel radius of non-skiers and junior skiers,it is more conducive to promoting domestic travel.In general,the skier skill level in China was generally lower,and the ski resort comprehensive leisure environment optimization is conducive to overcoming the limitation of the travel radius caused by the disadvantageous skill level of consumers.However,to promote the development of China’s ski industry in the long run,it is necessary to focus on improving the consumer’s ski skill level,but prevent the risk of losing high-skill consumers overseas.In the course of improving the level of domestic ski sports facilities,we should also focus on the domestic leisure cultural tourism environment to better enhance the attractiveness of domestic ski destinations.展开更多
Objective: To investigate the changes of proton transportation across the inner mitochondrial membrane (IMM) and H + ATPase of hepatocytes in endotoxic shock rats. Methods: Endotoxin from E.Coil of 5.0 mg/kg or saline...Objective: To investigate the changes of proton transportation across the inner mitochondrial membrane (IMM) and H + ATPase of hepatocytes in endotoxic shock rats. Methods: Endotoxin from E.Coil of 5.0 mg/kg or saline of 1 ml/kg was injected into the femoral vein. The rats were sacrificed pre injection and 1, 3, 5, 8 hours after injection, and plasma and liver tissue samples were collected respectively. The liver tissue samples were used for preparation of mitochondria and submitochondrial particles (SMPs). The proton translocation of SMPs and H + ATPase, phospholipase A 2 (PLA 2) activities and malondialdehyde (MDA) content, membrane fluidities of different level of mitochondria membrane and plasma MDA content were assayed. Results: (1) Five hours after E. Coli. O111B4 injection, the maximum fluorescence quenching ACMA after adding ATP, nicotinamide adenin dinucleoacid hydrogen (NADH), and the succinate were significantly decreased (P< 0.05 ). The time of maximum fluorescent quenching and the half time of fluorescent quenching were significantly prolonged (P< 0.01 ), especially when NADH was used as a substrate. (2) The mitochondrial H + ATPase activity was significantly increased at early stage of endotoxic shock (P< 0.05 ), and significantly decreased at late stage of endotoxic shock (P< 0.01 ). (3) The mitochondrial membrane bound PLA 2 activity, plasmal and mitochondrial MDA content were significantly increased and succinate dehydrogenase (SDH) activity of mitochondria decreased markedly in endotoxic shock rats (P< 0.05 ). (4) The mitochondrial membrane fluidity of different lipid regions was decreased, especially in the head of phospholipid. Conclusions: Proton transportation across IMM and mitochondrial H + ATPase activity are significantly decreased in endotoxic shock.展开更多
文摘Brain injuries in sports drew more and more public attentions in recent years. Brain injuries vary by name, type, and severity in the athletic setting. It should be noted, however, that these injuries are not isolated to only the athletic arena, as non-athletic mechanisms （e.g., motor vehicle accidents） are more common causes of traumatic brain injuries （TBI） among teenagers. Notwithstanding, as many as 1.6 to 3.8 million TBI result from sports and recreation each year in the United States alone. These injuries are extremely costly to the global health care system, and make TBI among the most expensive conditions to treat in children. This article serves to define common brain injuries in sport; describe their prevalence, what happens to the brain following injury, how to recognize and manage these injuries, and what you can expect as the athlete recovers. Some return-to-activity considerations for the brain-injured athlete will also be discussed.
基金Supported by Natural Science Foundation of Tianjin (No. 09JCYBJC06400)Science and Technology Foundation of Civil Aviation Administration of China (No. MHRDZ200802)
文摘The trajectory model of dispersed phase drops and the model of basic flow for drop motion between two inclined parallel plates are derived with the optimized calculation. The analytical results of direct numerical simulation indicate that the basic flow plays an important role in the drop coalescence on liquid-liquid interface. In the stratified two-phase flow field, the smaller droplets are difficult to drain the thin continuous film between the approaching droplets and bulk interfaces and eventually immerse into the trickling film to yield coalescence. They almost attain the velocity of their local surroundings. Moreover, the basic flow exerts a dominant influence on the motion of smaller droplet. The smaller droplets are easily entrained by the basic flow. On the contrary, the larger drop presents advantageous characteristics of coalescence due to its high velocity. The range of 0.3 mm < δR≤ 0.75 mm is the advantageous drop coalescence condition since the rapidly varied velocity and its first derivative theoretically cause the forces acting on a drop to become imbalanced. On the other hand, the thin layer of the continuous phase drained from the interval between the drops and trickling film should not be neglected in the calculation of shearing force since it is important for drop rotation. The drop rotation is an indispensable factor in coalescence.
文摘Tujia Waving Dance, as an important part of culture, has drawn the attention of many scholars in sociology and ethnology and researched by them in recent years, with the results one after another. But from the perspective of sports and culture to observe and understand the Waving Dance, there are still not many learners and their analysis is limited to the discussions of the value of fitness and the recreational sports, but being ambiguous on the classification of the Waving Dance and its genes discussions, with some problems having big controversy. We can start from the basic shape of the Waving Dance to identify its dance category, to determine its basic factor, and to analyze the diversity value of the Waving Dance.
文摘The 21st century is the era of human recreation. What leisure and sport bring to people is bound to be a civilized, healthy, happy, and new life patterns. Throughout the development of sports and leisure history, we can see that in the era of leisure sports agricultural, civilization reflects a more casual game. Strictly speaking, leisure sport is a product of the birth of modern industrial civilization. But today, it has become a recreational sport entirely necessities of life, recreation is the ultimate ownership of human beings, but also one of the best state of human existence, and therefore we have reason to believe that in the near future, leisure Sports will bring a self-liberation and ultimate human freedom.
文摘Background：Research has been conducted linking sports participation and health in childhood and adolescence;however,little is known about the contribution of sport to women＇s health.The purpose of this study was to examine the relationship between sport and women＇s health in the USA by analyzing data from the Behavioral Risk Factor Surveillance System（BRFSS）.Methods：This study was a secondary data analysis of the 2013 national BRFSS survey.Unlike the BRFSS core component from previous years,in2013,participants were questioned extensively about their physical activity behaviors.Seventy-six different activities were identifie by the participants.Two researchers categorized the 76 activities as sport,conditioning exercise,recreation,or household tasks based on previously identifie categories.Logistic regression was utilized to calculate odds ratios and adjusted odds ratios for chronic diseases based on physical activity category.Results：Women who participated in sport had better health outcomes with significant y lower odds for all chronic diseases except asthma and better general health than women who participated in conditioning exercise,household tasks,or recreation,and many of the significan differences remained after controlling for demographic characteristics.Conclusion：Sport participation was associated with more positive health outcomes among women in the USA compared with the other categories.As a means to improve health of women,the USA could focus on efforts to increase sport participation among women.
文摘Exercise affects muscle metabolism and composition in the untrained muscles. The proteome of muscle tissue will be affected by exercise and resting. This is of economic importance for pork quality where transportation relates to exercise of untrained muscles. Rest reverses exercise effects. The objective of this research was to develop potential protein biomarkers that predict the optimal resting time after exercise related to optimal pork quality. Ten litters of four female pigs were within litter allocated to the four treatment groups： exercise by running on a treadmill for 27 minutes followed by rest for 0, 1, or 3 h; control pigs without exercise. Proteome profiles and biochemical traits measuring energy metabolism and meat quality traits expected to be related to exercise were determined in the Longissimus and the Biceps femoris of the pigs. The results indicated associations between protein abundances in muscles and exercise, resting, and biochemical traits.
基金The National Natural Science Foundation of China(42071199)The General Project of Scientific Research Program of Beijing Municipal Education Commission(SM202110031002)The Key Project of National Key Research and Development Plan(2019YFB1405600).
文摘Starting from the skill characteristics of ski tourism,this paper discusses the impact of consumer skill on travel decisions,and the moderating effect of the ski resort’s comprehensive leisure environment(including the ski resort sports environment and the regional cultural tourism environment),in order to both understand their impacts on the travel distance characteristics of skiers and attempt to provide necessary research support for the development of China’s ski industry and the construction of destinations.Based on the data from multi-period visitor surveys,this paper constructs the consumption skill-travel radius decision-making influence model under the moderating effect of the ski resort comprehensive leisure environment.The results show three main characteristics.(1)The travel radius obviously differs among skiers with different skill levels.The skill level of skiers has a significant positive effect on the larger travel radius,and a significant negative effect on the smaller travel radius.That is,skiers with a higher skill level are more inclined to undertake long-distance skiing travel,while skiers with a lower skill level are more inclined to undertake short-distance skiing travel.(2)The comprehensive leisure environment has a significant moderating effect on the skiers’travel radius,with a significant positive impact on enlarging the travel radius,while the influences on high-skill and low-skill skiers are significantly higher than on middle-skill skiers.(3)In the comprehensive leisure environment,there are differences in the moderating effect of the ski resort sports environment and the regional cultural tourism environment on the skiers travel radius,and the positive moderating effect of the ski resort sports environment on the high-skill skiers’travel radius is more obvious.While the regional cultural tourism environment has a more obvious positive moderating effect on the travel radius of non-skiers and junior skiers,it is more conducive to promoting domestic travel.In general,the skier skill level in China was generally lower,and the ski resort comprehensive leisure environment optimization is conducive to overcoming the limitation of the travel radius caused by the disadvantageous skill level of consumers.However,to promote the development of China’s ski industry in the long run,it is necessary to focus on improving the consumer’s ski skill level,but prevent the risk of losing high-skill consumers overseas.In the course of improving the level of domestic ski sports facilities,we should also focus on the domestic leisure cultural tourism environment to better enhance the attractiveness of domestic ski destinations.
文摘Objective: To investigate the changes of proton transportation across the inner mitochondrial membrane (IMM) and H + ATPase of hepatocytes in endotoxic shock rats. Methods: Endotoxin from E.Coil of 5.0 mg/kg or saline of 1 ml/kg was injected into the femoral vein. The rats were sacrificed pre injection and 1, 3, 5, 8 hours after injection, and plasma and liver tissue samples were collected respectively. The liver tissue samples were used for preparation of mitochondria and submitochondrial particles (SMPs). The proton translocation of SMPs and H + ATPase, phospholipase A 2 (PLA 2) activities and malondialdehyde (MDA) content, membrane fluidities of different level of mitochondria membrane and plasma MDA content were assayed. Results: (1) Five hours after E. Coli. O111B4 injection, the maximum fluorescence quenching ACMA after adding ATP, nicotinamide adenin dinucleoacid hydrogen (NADH), and the succinate were significantly decreased (P< 0.05 ). The time of maximum fluorescent quenching and the half time of fluorescent quenching were significantly prolonged (P< 0.01 ), especially when NADH was used as a substrate. (2) The mitochondrial H + ATPase activity was significantly increased at early stage of endotoxic shock (P< 0.05 ), and significantly decreased at late stage of endotoxic shock (P< 0.01 ). (3) The mitochondrial membrane bound PLA 2 activity, plasmal and mitochondrial MDA content were significantly increased and succinate dehydrogenase (SDH) activity of mitochondria decreased markedly in endotoxic shock rats (P< 0.05 ). (4) The mitochondrial membrane fluidity of different lipid regions was decreased, especially in the head of phospholipid. Conclusions: Proton transportation across IMM and mitochondrial H + ATPase activity are significantly decreased in endotoxic shock.
