Effect of a Marathon Run on Serum Lipoproteins,Creatine Kinase,and Lactate Dehydrogenase in Recreational Runners

Abstract

The objective of this study was to determine the effect of a marathon run on serum lipid and lipoprotein concentrations and serum muscle enzyme activities and follow their recovery after the run. These blood concentrations were measured before, immediately after, and serially after a marathon run in 15 male recreational runners. The triglyceride level was significantly elevated postrace, then fell 30% below baseline 1 day after the run, and returned to baseline after 1 week. Total cholesterol responded less dramatically but with a similar pattern. High-density lipoprotein cholesterol remained significantly elevated and low-density lipoprotein cholesterol was transiently reduced for 3 days after the run. The total cholesterol/high-density cholesterol ratio was significantly lowered for 3 days. Serum lactate dehydrogenase activity significantly doubled postrace and then declined but remained elevated for 2 weeks. Serum creatine kinase activity peaked 24 hr after the run, with a 15-fold rise, and returned to baseline after 1 week. The rise of these enzymes reflects mechanically damaged muscle cells leaking contents into the interstitial fluid. It is concluded that a prolonged strenuous exercise bout in recreational runners, such as a marathon, produces beneficial changes in lipid blood profiles that are significant for only 3 days. However, muscle damage is also evident for 1 week or more from the dramatic and longlasting effect on enzyme levels. Laboratory values for these runners were outside normal ranges for some days after the race.     

SCHOOL DELINQUENCY AND SOCIAL BOND FACTORS: EXPLORING GENDERED DIFFERENCES AMONG A NATIONAL SAMPLE OF 10TH GRADERS

School delinquency has been linked to an array of negative educational outcomes, and if left unchecked, may lead to more serious problems in adulthood. Identifying the risk and protective factors that influence school delinquency is therefore crucial to develop effective intervention programs. Utilizing Hirschi's social bond theory as a framework, the authors investigated the relationships between social bonds (i.e., parental involvement, bond to school, beliefs, commitment to sport activities, commitment to non‐sport activities, and involvement) and school delinquency among a nationally representative sample of 10th graders. Special attention was given to gender differences. Results indicate that social bond measures account for a significant variance in school delinquency (11.2%, p < .001) above and beyond that predicted by socioeconomic status (1.5%, p < .001), and that the relationships between social bonds and school delinquency vary across gender. Practical and theoretical implications are for educators and researchers alike.     

Cascade optical chromatography for sample fractionation

Optical chromatography involves the elegant combination of opposing optical and fluid drag forces on colloidal samples within microfluidic environments to both measure analytical differences and fractionate injected samples. Particles that encounter the focused laser beam are trapped axially along the beam and are pushed upstream from the laser focal point to rest at a point where the optical and fluid forces on the particle balance. In our recent devices particles are pushed into a region of lower microfluidic flow, where they can be retained and fractionated. Because optical and fluid forces on a particle are sensitive to differences in the physical and chemical properties of a sample, separations are possible. An optical chromatography beam focused to completely fill a fluid channel is operated as an optically tunable filter for the separation of inorganic, polymeric, and biological particle samples. We demonstrate this technique coupled with an advanced microfluidic platform and show how it can be used as an effective method to fractionate particles from an injected multicomponent sample. Our advanced three-stage microfluidic design accommodates three lasers simultaneously to effectively create a sequential cascade optical chromatographic separation system.     

Single view silhouette fitting techniques for estimating tennis racket position

Stereo camera systems have been used to track markers attached to a racket, allowing its position to be obtained in three-dimensional (3D) space. Typically, markers are manually selected on the image plane, but this can be time-consuming. A markerless system based on one stationary camera estimating 3D racket position data is desirable for research and play. The markerless method presented in this paper relies on a set of racket silhouette views in a common reference frame captured with a calibrated camera and a silhouette of a racket captured with a camera whose relative pose is outside the common reference frame. The aim of this paper is to provide validation of these single view fitting techniques to estimate the pose of a tennis racket. This includes the development of a calibration method to provide the relative pose of a stationary camera with respect to a racket. Mean static racket position was reconstructed to within ±2 mm. Computer generated camera poses and silhouette views of a full size racket model were used to demonstrate the potential of the method to estimate 3D racket position during a simplified serve scenario. From a camera distance of 14 m, 3D racket position was estimated providing a spatial accuracy of 1.9 ± 0.14 mm, similar to recent 3D video marker tracking studies of tennis.     

Dilemmas of Participatory Enquiry: a case study of method‐in‐action

The purpose of this paper is to problematize the notion of participatory enquiry as a legitimate form of educational evaluation. Using a case study of a new teacher education program the authors describe how they negotiated and enacted an alternative evaluation methodology within a traditional context. The evaluation process was intended to actively engage faculty members and students, as well as representatives of the educational system and the broader community, in self‐reflection and self‐evaluation of their own program. The authors then attempt to turn the methodology back on itself by critically analyzing their own participatory process in terms of a number of dilemmas that arose during the three‐year course of the evaluation. These dilemmas were addressed directly as political issues of method as a means of eliciting discussion and debate about the appropriateness of various forms of enquiry in the assessment and evaluation of higher education.     

Sex bias and the validity of believed differences between male and female interscholastic athletic coaches

Previous research indicates that young athletes as well as athletic administrators hold gender-role stereotypical beliefs about coaches that disfavor females. The validity of two such beliefs (lack of qualified female coaches and time constraints due to family responsibilities) was examined in a statewide survey of 256 female and 296 male interscholastic coaches and a nationwide survey of 2,719 male and 1,449 female interscholastic coaches. Statistical analyses (p less than .001) indicated that female coaches were (a) more qualified than their male counterparts with respect to coaching experience with female teams, professional training, and professional experience; (b) as qualified as male coaches with regard to intercollegiate playing experience; and (c) less qualified than male coaches with respect to high school playing experience and coaching experience with male teams. Findings also indicated that male rather than female coaches more often experienced time constraints due to family responsibilities.     

优秀运动员素质教育探索

通过对目前我国体育界优秀运动员素质状况的调查与分析,指出运动队存在着重专项运动素质教育而忽视其他素质教育,尤其是就业素质教育存在着更大的偏颇与弊端。为全面提高优秀运动员自身素质,培养跨世纪的新型体育人才,对优秀运动员素质教育内涵;素质教育要素;素质教育主要实施措施进行了探讨。     

Graduate Capabilities: a Framework for Assessing Course Quality 1

Three propositions about quality learning when linked to the concept of graduate capability provide a framework for examining the extent to which learning outcomes are embedded within the provision of authentic learning environments, a focus on global issues, and the development of skills to support life‐long learning. A case study in nursing at the Queensland University of Technology (QUT) is used to illustrate a student learning experience that addresses graduate capabilities, develops an authentic learning environment, addresses global issues, and fosters the development of skills to support life‐long learning.