Nutritional strategies for promoting fat utilization and delaying the onset of fatigue during prolonged exercise

Carbohydrate ingestion before and during endurance exercise delays the onset of fatigue (reduced power output). Therefore, endurance athletes are recommended to ingest diets high in carbohydrate (70% of total energy) during competition and training. However, increasing the availability of plasma free fatty acids has been shown to slow the rate of muscle and liver glycogen depletion by promoting the utilization of fat. Ingested fat, in the form of long-chain (C 16-22 ) triacylglycerols, is largely unavailable during acute exercise, but medium-chain (C 8-10 ) triacylglycerols are rapidly absorbed and oxidized. We have shown that the ingestion of medium-chain triacylglycerols in combination with carbohydrate spares muscle carbohydrate stores during 2 h of submaximal (< 70% VO 2 peak) cycling exercise, and improves 40 km time-trial performance. These data suggest that by combining carbohydrate and medium-chain triacylglycerols as a pre-exercise supplement and as a nutritional supplement during exercise, fat oxidation will be enhanced, and endogenous carbohydrate will be spared. We have also examined the chronic metabolic adaptations and effects on substrate utilization and endurance performance when athletes ingest a diet that is high in fat (> 70% by energy). Dietary fat adaptation for a period of at least 2-4 weeks has resulted in a nearly two-fold increase in resistance to fatigue during prolonged, low- to moderate-intensity cycling (< 70% VO 2 peak). Moreover, preliminary studies suggest that mean cycling 20 km time-trial performance following prolonged submaximal exercise is enhanced by 80 s after dietary fat adaptation and 3 days of carbohydrate loading. Thus the relative contribution of fuel substrate to prolonged endurance activity may be modified by training, pre-exercise feeding, habitual diet, or by artificially altering the hormonal milieu or the availability of circulating fuels. The time course and dose-response of these effects on maximizing the oxidative contribution of fat for exercise metabolism and in exercise performance have not been systematically studied during moderate- to high-intensity exercise in humans.     

Sport studies

The sport-for-development movement has grown exponentially in the last decade generating increasing academic attention. However, existing research has rarely sought the views of young people despite them being both the main target audience of initiatives and frequently the deliverers. This paper seeks to address young people's absence within research and advocate the importance of engaging them in sport-for-development debates to enhance understanding of current delivery and to improve policy and practice in the future. The paper examines Zambian young people's views of HIV/AIDS peer-led education delivered through sport considering particularly whether young people believe such interventions can encourage empowerment and subsequent behaviour change. The paper outlines the importance of improving understanding of how young people can begin to translate knowledge into agency. The paper concludes with the suggestion that change is more likely if peer-led education through sport programmes are combined with multi-layered interventions directed at all levels of communities.     

Selection of models in contingency tables: A reexamination

Qualitative data often need analysis using log-linear models, as pointed out by Liu and Sanders. In this article, references to the state-of-the-art literature and software packages for analyzing such data are presented. We also illustrate the two types of log-linear models and present procedures for investigating both types.     

Indexing tuition to cost of education: The impact on students and institutions

This study examines an emerging trend in state higher education finance policy: the use of an index to establish tuition and fee levels at public institutions. Based on a national survey of tuition-setting policies, this study documents the increasing use of an indexing formula to determine tuition levels. Factors encouraging this trend are examined, and questions that must be addressed by state and institutional policymakers in adopting such a formula are discussed. Policy implications for states and institutions are also considered.     

中国在应对反倾销方面存在的问题及对策

加入WTO后，中国将在更广的范围与世界各国和地区开展更深层次的经贸往来活动。针对其中出现的愈益频繁的倾销的斗争，章作出了一些分析，并提出了应对之策。     

Economic stress, parenting, and child adjustment in Mexican American and European American families

To assess the impact of economic hardship on 111 European American and 167 Mexican American families and their 5th-grade (M age=11.4 years) children, a family stress model was evaluated. Structural equation analyses revealed that economic hardship was linked to indexes of economic pressure that were related to depressive symptoms for mothers and fathers of both ethnicities. Depressive symptoms were linked to marital problems and hostile parenting. Paternal hostile parenting was related to child adjustment problems for European Americans, whereas marital problems were linked to child adjustment problems for Mexican Americans. Maternal acculturation was associated with both higher marital problems and lower hostile parenting. The utility of the model for describing the effects of economic hardship in Mexican Americans is noted.     

Building an online community to support the professional development of casual teachers

Abstract

With the burgeoning casualisation of the higher education workforce, the precarious nature of casual teaching has become increasingly well documented. Universities are recognising that enhancing quality learning and teaching must include attention to the provision of services, support, and professional development for teachers employed on a sessional or casual basis. This paper presents a study investigating an online course for supporting and connecting dispersed and diverse casual teachers at an Australian university. The study explores the role of community and the impact of professional development for casual teachers across discipline boundaries in an institution-wide online course.     

A meta-analysis of reading-level match dyslexia studies in consistent alphabetic orthographies

Annals of Dyslexia - We provide a meta-analytic review of all group-comparison studies that used reading-level match design, were conducted in highly consistent European orthographies, included...     

Development of auditory event-related potentials in young children and relations to word-level reading abilities at age 8 years

A relationship between brain responses at birth and later emerging language and reading skills have been shown, but questions remain whether changes in brain responses after birth continue to predict the mastery of language-related skills such as reading development. To determine whether developmental changes in the brain-based perceptual skills are systematically related to differences in word-level reading proficiency at age 8 years, brain event-related potentials (ERPs) to speech and nonspeech stimuli were recorded annually at the ages of 1 through 8 years in a sample of 109 typically developing children. Two measures of word-level reading (one that requires decoding of real words and one of pseudowords) were administered at age 8 years. Growth curve analysis, using the hierarchical linear models, related reading performance (average versus low) to the longitudinal maturation in the ERP waveform peak and latencies. Maturational changes (e.g., slope, acceleration, and cubic growth) in N1 amplitude from ages 1 to 4 were related to proficiency in decoding pseudoword stimuli only, with children who were less proficient in decoding pseudowords evidencing more steeply negative declines in amplitude with age, particularly at the frontal and parietal recording sites in response to both speech and nonspeech stimuli. In contrast, proficiency in decoding real words was related to developmental changes in N2 amplitudes from ages 4 to 8 only at the parietal recording site, and only in response to nonspeech stimuli. The early development of biologically based differences in the perception and processing of auditory information contributes to later group differences in reading proficiencies at school age.