THE COMPARISON TO THE CHARACTERISTICS OF THREE-DIMENSIONAL JOINT KINETICS BETWEEN SINGLE LEG AND DOUBLE LEG REBOUND JUMP

The purpose of this study was to clarify the differences between the SRJ and DRJ in terms of three-dimensional joint kinetics for the takeoff leg. Twenty male track and field athletes were performed repeated rebound jump with single leg (SRJ) and double leg (DRJ). Kinematics and kinetics data were recorded using Vicon T20 system (250 Hz) and force platforms (1000 Hz). When comparing a SRJ to a DRJ, the characteristics of the former are as follows: 1) the jump height by a single leg is significantly higher because of the larger hip joint work around the extension-flexion, especially on the abduction-adduction axes; 2) the hip extension and abduction torque is larger; and 3) in the SRJ, the hip abduction torque is larger than the hip extension torque. Therefore, the joint kinetics of the SRJ is characterized by the large hip abduction torque, in addition to the large hip extension torque

Correlación de las demandas y recursos laborales con el work engagement

Uno de los principales objetivos de las empresas es generar rentabilidad, ya que de ello depende su permanencia en el mercado; para lograrlo, es necesario que las organizaciones centren sus esfuerzos en garantizar que sus colaboradores tengan un buen desempeño y consigan así los resultados esperados. Esto ha hecho que las empresas se preocupen por gestionar el work engagement en sus colaboradores, ya que diversos estudios señalan que es un factor que está asociado a mayores índices de productividad, desempeño, compromiso con la organización; y menores índices de ausentismo y rotación. Para gestionar el work engagement se hace uso del Modelo de Demandas y Recursos Laborales (JD-R), ya que hace referencia a cómo las características laborales influyen en el bienestar del colaborador. Para esta investigación se consideraron el control laboral y soporte social como recursos laborales, mientras que la carga laboral y el conflicto trabajo – familia como demandas laborales. La presente investigación busca identificar la relación e influencia que existe entre las demandas y recursos laborales mencionados sobre el work engagement. Se tomó una muestra de 88 colaboradores de nivel operario de una fábrica con una media de edad de 32.07 años. Los resultados evidencian correlaciones medianas directas entre el work engagement con ambos recursos laborales (r(control laboral) = .40; r(soporte social) = .35). Con respecto a las demandas laborales analizadas, estas no evidencian relación con el work engagement.One of the main objectives for organizations is to be profitable, so that they can stay competitive in the market. To make this happen, it is necessary that organizations focus their efforts in making sure that their workers have good performances and achieve the expected results. This is the reason why organizations around the world are trying to manage their worker’s work engagement, because different studies have shown that work engagement appears as a variable associated with more productivity, performance, commitment to the organization; and less absenteeism and turnover. In order to manage work engagement, the Job Demand – Resources Model (JD-R) is used, which states how some work characteristics have an influence on the worker’s satisfaction. For this investigation, job control and social support are considered as job resources; while workload and work – family conflict are considered as job demands. This investigation’s objective is to identify the relation and influence these resources and demands have on work engagement. The sample consists of 88 operative workers from a factory with an age mean of 32.07 years old. The results show medium direct relation between work engagement and both job resources (r(job control) = .40; r(social support) = .35). Both job demands show no signs of relation with work engagement.Tesi

A Case of Lobulated and Pedunculated Duodenal Hyperplastic Polyp Treated with Snare Polypectomy

We report herein the case of a lobulated and pedunculated hyperplastic polyp in the third portion of the duodenum causing anemia and occult blood in stools, which was detected by capsule endoscopy (CE) and treated with snare polypectomy. A 71-year-old man was referred to our hospital because of anemia and occult blood in stools. Three months earlier, he had been admitted to another hospital because of hemorrhage from gastric antral vascular ectasia (GAVE). Despite being treated for GAVE, hemoglobin decreased gradually. Esophagogastroduodenoscopy (EGD) and colonoscopy revealed no source of bleeding. However, CE revealed a polyp at the distal duodenum. Barium meal and EGD revealed a lobulated and pedunculated polyp in the third portion of the duodenum. The polyp was treated with snare polypectomy. Histopathological examination of the polyp revealed hyperplasia. After treatment of the polyp, the anemia improved gradually. To our knowledge, there are only 6 reported cases of a duodenal hyperplastic polyp, including our case. The polyp was pedunculated in only 2 cases and lobulated only in our case. Moreover, our case was diagnosed by CE. When a patient presents with anemia or obscure gastrointestinal bleeding undiagnosed by EGD and colonoscopy, CE is useful for detecting the bleeding lesion

Cavernous malformation of the optic chiasm with continuous hemorrhage in a pregnant woman: A case report

Background Cavernous malformation of the anterior visual pathway is rare, especially in pregnant woman. Planning a treatment strategy with cross-disciplinary specialists is important. Case description A 27-year-old pregnant woman presented with acute hemorrhage around the right optic nerve and chiasm, manifesting as poor vision in both eyes. Examination revealed right-eye deteriorated acuity and bilateral temporal hemianopsia. Computed tomography showed an oval high-density mass in the suprasellar region. Gradient echo-based T2-weighted magnetic resonance imaging showed the lesion to be hypointense (possibly a hematoma) and mainly in the optic chiasm. Fluid attenuated inversion recovery imaging showed a bilateral optic tract surrounding the lesion, which enlarged over 1 week, increasing the loss of visual function. Five days after admission, she delivered a healthy >2500-g baby by cesarean section (CS). Right frontotemporal craniotomy was performed 7 days after CS. Incision of the right optic nerve's lateral surface revealed clotted blood with abnormal vascular construction from the right side of the chiasm. We removed the hematoma and vascular lesion. Visual evoked potentials were detected only after optic chiasm decompression. Histological evaluation revealed a hematoma-like lesion with capsules and hemosiderin deposition, suggesting cavernous malformation. Her postoperative recovery was uneventful, with right visual acuity returning to normal, and her visual field not deteriorating any more. Conclusion Devising a treatment strategy with the obstetrician was important in this case to manage the hematoma and cavernous malformation safely

An improved and simple experimental technique for modeling thermal convection in science class using frozen starch syrup and localized heating

Plate tectonics is one of the most important and basic concepts required for understanding volcanic activity, seismicity, and various geological phenomena occurring within the framework of the rock cycle. Mantle convection, which refers to the thermal convection in the mantle, is the driving force for plate tectonics. Therefore, a heat convection modeling experiment was proposed for secondary school-level science students so that they can visualize and comprehend mantle convection. In this article, to improve operability and repeatability, we proposed a technique for conducting a simple experiment to model thermal convection using frozen starch syrup and localized heating; the use of starch syrup was suggested in a previous study.本研究の一部はJSPS科研費26350235，16K00966，17H00820の助成を受けて行われた