Predicting vertical ground reaction force during running using novel piezoresponsive sensors and accelerometry

ABSTRACT

Running is a common exercise with numerous health benefits. Vertical ground reaction force (vGRF) influences running injury risk and running performance. Measurement of vGRF during running is now primarily constrained to a laboratory setting. The purpose of this study was to evaluate a new approach to measuring vGRF during running. This approach can be used outside of the laboratory and involves running shoes instrumented with novel piezoresponsive sensors and a standard accelerometer. Thirty-one individuals ran at three different speeds on a force-instrumented treadmill while wearing the instrumented running shoes. vGRF was predicted using data collected from the instrumented shoes, and predicted vGRF were compared to vGRF measured via the treadmill. Per cent error of the resulting predictions varied depending upon the predicted vGRF characteristic. Per cent error was relatively low for predicted vGRF impulse (2–7%), active peak vGRF (3–7%), and ground contact time (3–6%), but relatively high for predicted vGRF load rates (22–29%). These errors should decrease with future iterations of the instrumented shoes and collection of additional data from a more diverse sample. The novel technology described herein might become a feasible way to collect large amounts of vGRF data outside of the traditional biomechanics laboratory.     

Antecedents and consequents of student satisfaction in higher technical-vocational education: evidence from Brazil

International Journal for Educational and Vocational Guidance - This article proposes a model of antecedents and consequences of student satisfaction in Higher Technical-Vocational Education (HTVE)...     

Correlates of Sustained Volunteering: Advocacy for Students with Disabilities

Parents of students with disabilities often receive support from special education advocates, who may be trained through a variety of programs. Using a web-based survey, this study examined the postgraduation advocacy activities of 83 graduates of one such volunteer advocacy training program. In the one to four years after program graduation, 63.8% (53 of 83) of the graduates advocated for one or more families; these sustained advocates reported stable rates of advocacy over time, and advocates performed activities that were either family-focused or school-focused. For graduates who advocated post-training, amounts of advocacy were positively related to satisfaction with advocating and with higher levels of involvement with other advocates and with the broader disability community. Compared to those not advocating after graduating, sustained advocates reported greater advocacy-role identities, increased involvement in disability groups, and higher likelihood to advocate in the upcoming year. Future research and practice implications are discussed.     

Evaluating the performance of school psychologists: Current status and future directions with a 360-degree evaluation process

The purpose of this article is twofold: (a) to present the results of a study examining the current status of performance evaluations for school psychologist and (b) to use those findings to inform future directions. A content analysis of a national sample of 36 performance appraisal rubrics was conducted to examine their alignment with the professional standards established by the National Association of School Psychologists (NASP). Among the rubrics reviewed, 88.9% featured eight or more of the NASP domains of practice, yet only 56% of the rubrics featured all 10 domains, suggesting variability in the degree to which the rubrics aligned with the standards of practice, particularly for rubrics developed at the district-level. The results of this study informed the development of a 360-evaluation process based on the Framework for Personnel Evaluation of School Psychologists Utilizing the NASP Practice Model and Morrison's four key principles for evaluating the performance of school psychologists.     

Involvement of endothelial progenitor cells in the formation of plexiform lesions in broiler chickens: possible role of local immune/inflammatory response

Plexiform lesions (PLs), which are often accompanied by perivascular infiltrates of mononuclear cells, represent the hallmark lesions of pulmonary arteries in humans suffering from severe pulmonary arterial hypertension (PAH). Endothelial progenitor cells (EPCs) have been recently implicated in the formation of PLs in human patients. PLs rarely develop in rodent animal models of PAH but can develop spontaneously in broiler chickens. The aim of the present study was to confirm the presence of EPCs in the PLs in broilers. The immune mechanisms involved in EPC dysfunction were also evaluated. Lungs were collected from commercial broilers at 1 to 4 weeks of age. The right/total ventricle ratios indicated normal pulmonary arterial pressures for all sampled birds. Immunohistochemistry was performed to determine the expressions of EPC markers (CD133 and VEGFR-2) and proangiogenic molecule hepatocyte growth factor (HGF) in the lung samples. An EPC/lymphocyte co-culture system was used to investigate the functional changes of EPCs under the challenge of immune cells. PLs with different cellular composition were detected in the lungs of broilers regardless of age, and they were commonly surrounded by moderate to dense perivascular mononuclear cell infiltrates. Immunohistochemical analyses revealed the presence of CD133⁺ and VEGFR-2⁺ cells in PLs. These structures also exhibited a strong expression of HGF. Lymphocyte co-culture enhanced EPC apoptosis and completely blocked HGF-stimulated EPC survival and in vitro tube formation. Taken together, this work provides evidence for the involvement of EPCs in the development of PLs in broilers. It is suggested that the local immune cell infiltrate might serve as a contributor to EPC dysfunction by inducing EPC death and limiting their response to angiogenic stimuli. Broiler chickens may be valuable for investigating reversibility of plexogenic arteriopathy using genemodified inflammation-resistant EPCs.     

髋关节滑膜皱襞生长发育的应用解剖学研究

木文对胎儿、儿童和成人三个年龄组,总计126侧髋关节进行了解剖学观测.发现片状滑膜皱襞在胎儿5月龄时就已经发生,绒毛状皱襞则在儿童早期才开始出现.并发现滑膜皱襞伴随着机体的生长发育,形态逐渐增大,数量逐渐增多,直到成年期方趋于稳定.同时发现,髋关节的滑膜皱襞(唇外皱襞)主要分布在三个部位:股骨头韧带的基部、髋臼唇外缘和股骨颈滑膜反折处.特别是髋臼唇外缘的滑膜皱襞有少数(9.52%)嵌入头臼之间的缝隙之中,作者认为唇外皱襞(C皱襞)是导致儿童髋关节滑膜皱襞综合症的形态学基础.     

Implementation as a Focus of Consultation to Evaluate Academic Tutoring Services in an Urban School District: A Case Study Example

This article describes a multiagency initiative to evaluate academic tutoring services by focusing on the processes that contribute to effective program implementation. Community-based tutoring service providers serving students in the Cincinnati Public Schools (OH) partnered to initiate a “Seal of Approval” process for promoting evidence-based practices among tutoring providers, assigning merit to effective programs, and eliminating or remediating ineffective practices. The consultant-driven process evaluation was designed to be fair and equitable among an array of tutoring service providers. This case example has implications for consultants, tutoring program directors, and school district administrators seeking to establish an accountability system for tutoring service providers.