利用流行电视节目“美国忍者”（ANW）进行体育课程设计

当今流行文化占据了美国学生大量的时间。因此,教育工作者理应承认并拥抱当前流行的电视节目、电子游戏和文化现象,并利用这些"热点",将关键的教学内容与学生的兴趣衔接起来。以美国流行的电视节目"美国忍者"(ANW)的运动单元为借鉴,根据学龄儿童青少年的特点和学校体育场馆器械的现实对流行电视节目的运动单元和理念进行整合,形成"忍者勇士"(PE-NW)体育课程;详细介绍课程的安排、计划和实施,课程包含的以障碍挑战的形式进行体育练习的方式方法、针对的学生身体素质内容以及安全原则、训练原则等内容。我国学龄儿童青少年同样处于与美国同龄人类似的环境和情况,了解国外优秀体育课程开发和设计的思路,可以为开发出适应中国国情或地域特定情况的、更有效果的体育课提供借鉴。     

Gonadal hormones may predict structural bone fragility in elite female soccer player

ABSTRACT

Purpose: This study determined the impact of menstrual status on bone tissue in elite post-pubertal female soccer players over an entire season.

Methods: Fifty-one elite female soccer players participated. At baseline, forty-one were assigned to the low hormonal androgenic profile (low-HAPL) and 10 to the high hormonal androgenic profile (high-HAPL).

Results: An 8-month training program led to increased bone mineral density content (p<0.05). The low-HAPL athletes improved the Narrow neck average cortical thickness (ACT) by 1.4% and reduced the corresponding Buckling ratio (BR) by 2.6%, thus decreasing the fracture risk (p<0.05). The high-HAPL athletes decreased the Narrow neck ACT by 5.4% and increased the BR by 2.6%, increasing fracture risk (p<0.05). Differences were assigned as being “very likely beneficial” for the low-HAPL athletes, supported by very large (d=3.41) and large (d=1.58) effect sizes for the Narrow neck ACT and BR, respectively.

Conclusion: A season of soccer training has induced bone geometry improvements in adolescent females. Bone health parameters improved in the two clusters. However, high-HAPL athletes decreased its resistance to loading compare to low-HAPL athletes. Even if female players do not present clinical symptoms related to their hormonal status, sport medicine physicians should pay attention to their structural bone fragility.     

Effects of pitch spatial references on players’ positioning and physical performances during football small-sided games

The aim of this study was to identify the effects of adding spatial references during football small-sided games in youth players’ tactical and physical performance. Twelve under-15 players performed a Gk+ 6v6+ Gk game under two playing conditions: (i) without spatial references (CONTROL condition); (ii) with spatial references, by dividing equally the pitch into three corridors and three sectors (experimental situation, LINES). Players’ positional data was used to compute time-motion and tactical-related variables. The results revealed that performance under LINES situation increased the regularity in the zones occupied (~14%, Cohen’s d: 0.5; ±0.3; p = 0.003) and in the distance between teammates’ dyads (~19%, 0.9; ±0.2; p < 0.001). Oppositely, LINES condition decreased the longitudinal synchronization of players’ displacements (0.4; ±0.2; p = 0.002), players’ average speed (0.5; ±0.3; p = 0.002) and distance covered at lower (0.9; ±0.3; p < 0.001) and moderate speed (0.5; ±0.3; p < 0.001). Adding spatial references seems to promote a more structured pattern of play and increase positional regularity. However, coaches should be aware that this constraint may decrease the synchronization between players. Overall, these findings may be generalized to most invasion team sports.     

Beyond muscle: the effects of creatine supplementation on brain creatine,cognitive processing,and traumatic brain injury

Abstract

The ergogenic and therapeutic effects of increasing muscle creatine by supplementation are well-recognized. It appears that similar benefits to brain function and cognitive processing may also be achieved with creatine supplementation, however research in this area is more limited, and important knowledge gaps remain. The purpose of this review is to provide a comprehensive overview of the current state of knowledge about the influence of creatine supplementation on brain function in healthy individuals. It appears that brain creatine is responsive to supplementation, however higher, or more prolonged dosing strategies than those typically used to increase muscle creatine, may be required to elicit an increase in brain creatine. The optimal dosing strategy to induce this response, is currently unknown, and there is an urgent need for studies investigating this. When considering the influence of supplementation strategies on cognitive processes, it appears that creatine is most likely to exert an influence in situations whereby cognitive processes are stressed, e.g. during sleep deprivation, experimental hypoxia, or during the performance of more complex, and thus more cognitively demanding tasks. Evidence exists indicating that increased brain creatine may be effective at reducing the severity of, or enhancing recovery from mild traumatic brain injury, however, only limited data in humans are available to verify this hypothesis, thus representing an exciting area for further research.     

The impact of ‘central places’ on spatial spending patterns: evidence from Flemish local government cultural expenditures

Governments often see it as their responsibility to support cultural life and at times spend a significant amount of resources in the pursuit of this goal. The present article analyses whether and how municipalities influence each other in this decision to spend resources on the arts (using data on local government cultural spending in 304 Flemish municipalities in 2002). Following ‘central place theory’, the focal point of the analysis is the idea that––especially for cultural expenditures––large municipalities (and, specifically, ‘central places’) may affect their neighbours’ behaviour differently than small municipalities. The empirical analysis supports this idea. Indeed, we show that Flemish municipalities’ cultural spending is generally positively affected by that in neighbouring municipalities. This pattern is, however, significantly more complex for municipalities neighbouring the 13 largest Flemish cities.

ICDP approach to awareness-raising about children's rights and preventing violence, child abuse, and neglect

In April 2011, the Committee on the Rights of the Child issued the General Comment No. 13 on the right of the child to freedom from all forms of violence. Its Article 19 declares that "protective measures should, as appropriate, include effective procedures for the establishment of social programs to provide necessary support for the child and for those who have the care of the child." One available social program that focuses on providing support for parents, caregivers and children is the International Child Development Program (ICDP), which is presented in this article. The ICDP is designed to influence and improve the quality of contact and relation between the caregivers, usually parents, and children, through the practical application of the eight themes or guidelines for positive interaction. The Convention on the Rights of the Child is a value-based legal document ratified by most countries in the world. This is a significant achievement and it gives a new basis and legitimization for a more humane treatment of children all over the world. Nevertheless, it is important to understand that there is a big gap between a legal document describing ideal conditions for children at a macro-governmental level and its implementation at the microlevel of families and communities. The ICDP is another expression of the same humanitarian spirit as it is encoded in the convention of children' rights. ICDP can be put in practice in any community to create positive conditions for the fulfillment of fundamental children's rights: the right to be protected from violence and to receive the loving care and guidance from the immediate environment which is required to ensure healthy human development. Introducing children's rights is likely to have a major impact on families (and all levels of authorities) if efforts are also made to activate awareness and deeper bonding to children as persons. Without a deep activation of a more humanized and caring relationship to children, provided by social programs such as ICDP, the advocacy for children's rights may become an empty shell without its basis in human realities.     

Is syllable segmentation developmentally constrained by consonant sonority within syllable boundaries in silent reading? Evidence in French children

There is agreement that French typically reading children use syllable‐sized units to segment words. Although the statistical properties of the initial syllables or the clusters within syllable boundaries seem to be crucial for syllable segmentation, little is known about the role of consonant sonority in silent reading. In two experiments that used audio‐visual and visual pseudoword recognition tasks with 300 French typically developing children, we showed a progressive increase in the use of syllable segmentation from the first through fifth years of reading instruction. The children were influenced both by an optimal ‘sonorant coda–obstruent onset’ sonority profile and by the individual position‐dependent consonant sonority within syllable boundaries. Orthographic and phonological statistical properties did not clearly modulate the response patterns. We provide innovative data to help further understand the developmental course of the use of syllable segmentation as determined by sonority. We discuss our results in the light of linguistic principles.     

Effect of physiological harvest stages on the composition of bioactive compounds in Cavendish bananas

The combined influence of maturation, ripening, and climate on the profile of bioactive compounds was studied in banana (Musa acuminata, AAA, Cavendish, cv. Grande Naine). Their bioactive compounds were determined by the Folin-Ciocalteu assay and high-performance thin layer chromatographic (HPTLC) method. The polyphenol content of bananas harvested after 400 degree days remained unchanged during ripening, while bananas harvested after 600 and 900 degree days exhibited a significant polyphenol increase. Although dopamine was the polyphenol with the highest concentration in banana peels during the green developmental stage and ripening, its kinetics differed from the total polyphenol profile. Our results showed that this matrix of choice (maturation, ripening, and climate) may allow selection of the banana (M. acuminata, AAA, Cavendish, cv. Grande Naine) status that will produce optimal concentrations of identified compounds with human health relevance.