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671.
The purpose of this study was to determine the effects of systematic changes in stride rate and length at a given running speed on the peak shank deceleration (PSD) experienced during ground contact. Data were collected from 10 well-trained subjects as they ran on a treadmill at a pace of 3.8 m s-1 (7-min mile-1). Shank deceleration was measured by a lightweight accelerometer which was tightly attached over the distal medial tibia. High-speed films (200 Hz) were taken from a side view to quantify modifications in sagittal plane movement which might have accompanied the stride rate changes. Five stride rate conditions were randomly presented - 10% slower, 5% slower, normal, 5% faster and 10% faster. Average PSD was computed from 10 steps during each condition and testing was repeated on three different occasions. For each session, PSD observed for each condition was normalized to that observed at the normal stride rate in order to minimize the effects of variations in attachment of the accelerometer between and within subjects. The normalized PSD results at each stride rate tested were - normal = 1.0, 10% slower = 1.09, 5% slower = 1.03, 5% faster = 0.96 and 10% faster = 0.91. Significant differences were found between all these means except normal and 5% slower. The kinematic analysis revealed non-significant results for hip, knee and ankle joint angles at touchdown for the various stride rates. Application of the findings to existing analytical models indicated that, for a given running speed, peak impact forces in the ankle and knee joints decreased as stride rate increased. 相似文献
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This paper develops a framework to assess the text-based public information provided on program level government agency Web sites. The framework informs the larger e-government question of how, or whether, state administrative agencies are using Web sites in a transformative capacity—to change relationships between citizens and government. It focuses on assessing the degree to which text information provided on government Web sites could facilitate various relationships between government agencies and citizens. The framework incorporates four views of government information obligations stemming from different assumptions about citizen–government relationships in a democracy: the private citizen view, the attentive citizen view, the deliberative citizen view, and the citizen–publisher view. Each view suggests inclusion of different types of information on government agency web sites. The framework is employed to assess state Web sites containing information about chronic wasting disease, a disease effecting deer and elk in numerous U.S. states and Canada. 相似文献
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很多大学生表示他们不想做兼职工作,因为不想耽误学习(或玩乐)时间。然而,最新研究显示,兼职工作不仅能挣钱。还可以帮助学生提高平均成绩。通过对无数大学生的采访和调查。研究者们发现,每周工作1—20小时的大一新生平均成绩点数为3.13,而什么兼职都不做的学生其平均成绩点只有3.04。 相似文献
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Jason J. Burrow‐Sanchez William R. Jenson Elaine Clark 《Psychology in the schools》2009,46(3):238-245
Experimentation with substances is typical for many young people, but unfortunately some will go on to develop substance abuse problems that substantially affect their lives. Successfully intervening with students who use or abuse substances is a challenge for school mental health professionals across the nation. There is a need for evidence‐based practices that school professionals can use when working with students who have substance abuse problems. This article provides school professionals in secondary settings with current information on student substance use rates, evidence‐based individual and group interventions, and discussion of the 42 Code of Federal Regulations, Part 2 (42 CFR). © 2008 Wiley Periodicals, Inc. 相似文献