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Effects of weighted vests and sled towing on sprint kinematics   总被引:1,自引:0,他引:1  
In this study, we compared sprint kinematics of sled towing and vest sprinting with the same relative loads. Twenty athletes performed 30-m sprints in three different conditions: (a) un-resisted, (b) sled towing, and (c) vest sprinting. During sled towing and vest sprinting, external loads of 15% and 20% of body mass were used. Sprint times were recorded over 10 and 30 m. Sagittal-plane high-speed video data were recorded at 5, 15, and 25 m from the start. Relative to the un-resisted condition, sprint time increased (7.5 to 19.8%) in both resisted conditions, resulting mainly from decreased step length (-5.2 to -16.5%) with small decreases in step frequency (-2.7 to -6.1%). Sled towing increased stance phase duration (14.7 to 26.0%), trunk angle (12.5 to 71.5%), and knee angle (10.3 to 22.7%), and decreased swing phase duration (-4.8 to -15.2%) relative to the un-resisted condition. Vest sprinting increased stance phase duration (12.8 to 24.5%) and decreased swing phase duration (-8.4 to -14.4%) and trunk angle (-1.7 to -13.0%). There were significant differences between the two resisted conditions in trunk, thigh, and knee angles. We conclude that sled towing and vest sprinting have different effects on some kinematics and hence change the overload experienced by muscle groups.  相似文献   
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The purpose of this study was to determine the between day reliability of power-time measures calculated with data collected using the linear position transducer or the force plate independently, or a combination of the two technologies. Twenty-five male rugby union players performed three jump squats on two occasions one week apart. Ground reaction forces were measured via a force plate and position data were collected using a linear position transducer. From these data, a number of power-time variables were calculated for each method. The force plate, linear position transducer and a combined method were all found to be a reliable means of measuring peak power (ICC = 0.87-0.95, CV = 3.4%-8.0%). The absolute consistency of power-time measures varied between methods (CV = 8.0%-53.4%). Relative consistency of power-time measures was generally comparable between methods and measures, and for many variables was at an acceptable level (ICC = 0.77-0.94). Although a number of time-dependent power variables can be reliably calculated from data acquired from the three methods investigated, the reliability of a number of these measures is below that which is acceptable for use in research and for practical applications.  相似文献   
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In this article, I consider ways in which the concept of “proximity” can be put to work to understand how gendering occurs in the conduct of gender research – the theme of this special issue. If we accept that researchers are always already inside and implicated in the issues into which they inquire, and that they simultaneously establish an outside position which enables them to notice patterns, make inferences, and develop understandings, then we can say that researchers are always in proximity to something, and that this proximity, inherited or otherwise, places objects, capacities, and understandings within their reach, while also permitting them to extend their reach. In this article, I consider what happens in gender research contexts when researchers register certain proximities, fail to see others, or deny those that make them uncomfortable. Framed by my ongoing research into place cultures in boys’ schools, I argue that thinking gender research practices with the concept of “proximity” pushes researchers to think beyond essentializing accounts of how they gender and are gendered in doing gender research.  相似文献   
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Eccentric strength training is thought to be important for improving functional performance. A form of training that may enhance the eccentric training stimulus is the attachment of a rubber bungy to the strength-training apparatus in such a way that the return velocity and, therefore, the force required to decelerate the load at the end of the eccentric phase are increased. To determine the effects of elastic bungy training, we performed two studies. In the first, we examined the electromyographic (EMG) and kinematic characteristics of three different squat techniques: traditional squat, non-bungy jump squat and bungy jump squat. In the second study, we examined whether jump squat training with and without the attachment of a rubber bungy to an isoinertial supine squat machine affects muscle function, multidirectional agility, lunge ability and single leg jump performance. The EMG activity of the vastus lateralis and gastrocnemius muscles was recorded. An instrumented isoinertial supine squat machine was used to measure maximal strength and various force, velocity and power measures in both studies. Participants were randomly assigned to one of three groups: a control group and two weight-trained groups, one of which performed bungy squat jumps and one of which performed non-bungy squat jumps. The two experimental groups performed 10 weeks of ballistic weight training. The kinematic and EMG characteristics of the bungy and non-bungy squat techniques differed significantly from those of the traditional squat on all the variables measured. The only difference between the bungy squat and non-bungy squat training was greater EMG activity during the later stages (70-100%) of the eccentric phase of the bungy squat condition. The 10 weeks of bungy squat and non-bungy squat jump weight training were found to be equally effective in producing improvements in a variety of concentric strength and power measures (10.6-19.8%). These improvements did not transfer to improved performance for the single leg jump and multidirectional agility. However, bungy weight training did lead to a significant improvement in lunge performance (21.5%) compared with the other groups.  相似文献   
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ABSTRACT

The purpose of this paper is to quantify, review, and analyze published research output of academic librarians from 21 higher education Institutions in Ireland. A mixed approach using an online survey questionnaire, supplemented by content analysis and extensive literature scoping were used for data collection. Factors inhibiting and predicting the likelihood of research publication are identified. Motivations, barriers, and collaboration are examined. Qualitative perspectives from survey respondents are offered. The survey response was 30%. The main findings are presented and contextualized. There is evidence of moderate research growth and publication rates among the Irish LIS community; Open Access pathways are increasingly accepted. The paper has original value with both exploratory and analytical perspectives. This is the first comprehensive national study of this cohort; it adds value and a new perspective to the existing literature on academic librarians' participation in scholarly endeavours and communication.  相似文献   
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