Coaching points for the technique of the eggbeater kick in synchronized swimming based on three-dimensional motion analysis

We investigated coaching points for the technique of the eggbeater kick in synchronized swimming. The movements of the eggbeater kick for six female synchronized swimmers, all the top-ranking members at the Olympics and World Championships, were analyzed by using three-dimensional motion analysis. By comparing the movements of higher eggbeater-skilled swimmers with lower eggbeater-skilled swimmers, the coaching points for techniques of the eggbeater kick in synchronized swimming are clarified as follows. First, to hold the knees as high and as near the water surface as possible and to keep the heels close to the hips. Secondly, to keep the knees as wide as possible. Thirdly, to kick sideways producing lift force, and not to kick downward. Fourthly, to pull up the heels to nearly the water surface at the out-kick, with strong internal rotation of the thighs. Lastly, to move the feet as if treading water, with strong dorsiflexion and plantar flexion and adduction of the foot; that is to move the feet like the motion of the hands when sculling. Moreover, the movements of higher eggbeater-skilled swimmers can be termed 'horizontal kick type' and the movements of lower eggbeater-skilled swimmers can be termed 'vertical kick type'.     

Centre of pressure sway characteristics during static one-legged stance of athletes from different sports

Abstract

The frequency of one-legged stance and two-legged stance differs considerably among sports. We therefore expect the balance ability of athletes from different sports to vary. This study compared the sway characteristics during a static one-legged stance of soccer players, basketball players, swimmers, and non-athletes. The centre of pressure sway during one-legged stance of ten male participants representing each of the four groups was measured using a stabilometer. Centre of pressure sway was assessed by four sway factors: sway velocity, anterior-posterior sway, horizontal sway, and high-frequency sway. None of the four groups of participants showed significant differences in body sway between standing on the dominant leg and standing on the non-dominant leg. The soccer players had more high-frequency sway and less anterior-posterior sway and horizontal sway than the basketball players, swimmers, and non-athletes. These results suggest that soccer players have superior ability to maintain a stable one-legged stance. Further study is required to determine how much of the superior balance ability in soccer players is innate and how much is developed through training, as well as to determine the relationship between balance ability and playing performance.     

Behavior of reinforced concrete structural walls with various opening locations: experiments and macro model

Two experimental tests of three-storied reinforced concrete structural walls having large openings were performed.Based on an original macro model,a multiple modified macro-model was proposed to develop a simple method to design a reinforced concrete structural wall with large openings and various opening locations.The interaction between reinforcement ties and concrete struts formed along the perimeter of openings was neglected in the original model.However,the strut-and-tie node was proposed to take account of such interaction in the proposed model.The predicted behavior of two specimens using such a proposed model was compared with the experimental results.It is shown that the behavior of structural walls with large openings could be modeled well using the proposed model.Moreover,the study indicates that the proposed model is applicable even in cases of multi-story structural walls having large openings and various opening locations.     

Curriculum Mapping in Higher Education: A Vehicle for Collaboration

This qualitative study makes the case for the implementation of curriculum mapping, a procedure that creates a visual representation of curriculum based on real time information, as a way to increase collaboration and collegiality in higher education. Through the use of curriculum mapping, eleven faculty members in a western state university Teacher Licensure program aligned and revised the teacher education curriculum across a sequence of courses. An increase in collaboration and collegiality among faculty emerged as an unintended outcome as a result of participation in the project. Kay Pippin Uchiyama  is currently the Assessment Coordinator for the Poudre School District in Fort Collins, Colorado. During this study, she was an Assistant Professor of Teacher Education at Colorado State University and a co-primary investigator for the Preparing Tomorrow’s Teachers to Use Data grant. She received her Ph.D. in Instruction and Curriculum in the Content Areas with an emphasis on Teacher Education and Learning to Teach from the University of Colorado at Boulder. Her interests include data driven instruction, assessment for learning, teacher education, professional development schools, and mathematics education. Her email is kuchiyam@psdschools.org. Jean L. Radin  is an adjunct professor at Colorado State University and a co-primary investigator for the Preparing Tomorrow’s Teachers to Use Data grant. She received her Ph.D. from Colorado State University. Her interests are brain-based teaching and learning, data driven instructional practices, teacher education and professional development schools. Her email is jradin@cahs.colorado.edu.     

Rediscovering Development in Infancy

This commentary endorses J. Kagan’s (2008) conclusion that many of the most dramatic findings on early perceptual, cognitive, and social competencies are ambiguous. It supports his call for converging research operations to disambiguate findings from single paradigms and single response indices. The commentary also argues that early competencies must be placed into a longitudinal framework, thereby allowing researchers to (a) identify whether regressive phenomena play a role in skill development, (b) understand what functions (if any) given skills play in their precocious manifestations and whether these functions are comparable in later instantiations of skills, and (c) avoid rich interpretations by identifying how robust a suspected competency is across contexts.     

Professional development: a key to Kentucky's educational reform effort

Despite its essential role in educational reform, professional development typically does not receive adequate support in systemic reform efforts. This article presents an exception—a state that incorporated professional development as a central priority in its reform effort and four schools that used state resources to build their capacity for enacting the reform agenda. We describe central features of Kentucky's approach to professional development, characterize elements of professional development within the four schools, and discuss how these elements promoted three dimensions of school capacity: individual teachers’ knowledge, skills, and dispositions; professional community; and program coherence. Based on this “image of the possible,” we offer recommendations for professional development that supports systemic, standards-based educational reform.     

Stroke phase discrimination in breaststroke swimming using a tri-axial acceleration sensor device

Our previous study has demonstrated that the swimmer’s wrist acceleration in the crawl stroke and the breaststroke had distinctive characteristics between subjects (Ohgiet al. 2000). In addition, stroke phase discrimination could be achieved for the crawl stroke by using the swimmer’s wrist acceleration. This study provides evidence that the swimmer’s tri-axial wrist acceleration could be used for stroke phase discrimination in the breaststroke. Swimmers’ triaxial wrist accelerations were measured and their underwater stroke paths calculated. The authors examined the characteristics of the wrist acceleration, such as a local maximum or minimum, with reference to the swimmers’ stroke paths. As a result, it was suggested that the three phases of the breaststroke, the recovery, the insweep and the outsweep, could be distinguished using thex-axis (ulnar-radial axis) and they-axis (distal-proximal axis) acceleration. This methodology allows us to identify which stroke phase would be changed in skill training or over training, and the acceleration sensor device has the potential to become a precise stroke pedometer or stroke monitoring tool in the near future.     

Early effects of oral administration of omeprazole and roxatidine on intragastric pH

Objective

The ideal medication for the treatment of acid-related diseases, e.g., peptic ulcers, stress-related gastric bleeding, functional dyspepsia, and gastroesophageal reflux disease, should have a rapid onset of action to promote hemostasis and relieve the symptoms. The aim of our study was to investigate the inhibitory effects on gastric acid secretion of a single oral administration of a proton pump inhibitor, omeprazole 20 mg, and an H₂-receptor antagonist, roxatidine 75 mg.

Methods

Ten Helicobacter pylori-negative male subjects participated in this randomized, two-way crossover study. Intragastric pH was monitored continuously for 6 h after single oral administration of omeprazole 20 mg and roxatidine 75 mg. Each administration was separated by a 7-d washout period.

Results

During the 6-h study period, the average pH after administration of roxatidine was higher than that after administration of omeprazole (median: 4.45 vs. 2.65; P=0.0367). Also during the 6-h study period, a longer duration of maintenance at pH above 2, 5, and 6 was observed after administration of roxatidine 75 mg than after administration of omeprazole 20 mg (median: 90.6% vs. 55.2%, P=0.0284; 43.7% vs. 10.6%, P=0.0125; 40.3% vs. 3.3%, P=0.0125; respectively).

Conclusions

In Helicobacter pylori-negative healthy male subjects, oral administration of roxatidine 75 mg increased the intragastric pH more rapidly than that of omeprazole 20 mg.     

Centre of pressure sway characteristics during static one-legged stance of athletes from different sports

The frequency of one-legged stance and two-legged stance differs considerably among sports. We therefore expect the balance ability of athletes from different sports to vary. This study compared the sway characteristics during a static one-legged stance of soccer players, basketball players, swimmers, and non-athletes. The centre of pressure sway during one-legged stance of ten male participants representing each of the four groups was measured using a stabilometer. Centre of pressure sway was assessed by four sway factors: sway velocity, anterior-posterior sway, horizontal sway, and high-frequency sway. None of the four groups of participants showed significant differences in body sway between standing on the dominant leg and standing on the non-dominant leg. The soccer players had more high-frequency sway and less anterior-posterior sway and horizontal sway than the basketball players, swimmers, and non-athletes. These results suggest that soccer players have superior ability to maintain a stable one-legged stance. Further study is required to determine how much of the superior balance ability in soccer players is innate and how much is developed through training, as well as to determine the relationship between balance ability and playing performance.     

国产丝瓜藓属（真藓科）两新种

 报道了我国丝瓜藓属Pohlia两新种，即产自云南的明齿丝瓜藓 P．hyaloperistoma Zhang,Li &; Higuchi和产自西藏的疏叶丝瓜藓P．macrocarpa Zhang,Li&;Higuchi。前者主要特征为蒴齿透明无疣，后者孢子体大型且雌雄异株。