Energy availability in athletes

This review updates and complements the review of energy balance and body composition in the Proceedings of the 2003 IOC Consensus Conference on Sports Nutrition. It argues that the concept of energy availability is more useful than the concept of energy balance for managing the diets of athletes. It then summarizes recent reports of the existence, aetiologies, and clinical consequences of low energy availability in athletes. This is followed by a review of recent research on the failure of appetite to increase ad libitum energy intake in compensation for exercise energy expenditure. The review closes by summarizing the implications of this research for managing the diets of athletes.     

Engaging students in active learning: use of a blog and audience response system

Librarians provide instruction to medical students as part of a core course in the medical school curriculum. Instruction was provided, in part, through didactic sessions covering professional-level medical information resources, PubMed search skills, psychosocial information, and evidence-based medicine. Librarians redesigned instructional sessions with the goals of increasing student engagement and minimizing the lecture format, maximizing the number of students receiving feedback on their search and evaluation skills, and permitting students to see a variety of possible responses as well as engage in peer- and self-evaluation. Librarians integrated the use of a blog and an audience response system (ARS) into the instruction to help accomplish these goals.     

Maternal Parenting Stress,Child Exuberance,and Preschoolers’ Behavior Problems

This study investigated whether child exuberance, an aspect of temperament related to emotion regulation, moderates the well-documented association between high parenting stress and increased risk for internalizing and externalizing problems during the preschool years. At 42 months of age child exuberance was observed in 256 children (47% girls) and maternal self-reports on parenting stress were obtained. At 48 months internalizing and externalizing problems were assessed through reports from both parents. Indeed, higher maternal parenting stress increased the risk for internalizing problems, and this association was more pronounced among children with high levels of exuberance. Existent emotion regulation difficulties in highly exuberant children may further heighten the risk conveyed by an unfavorable caregiving environment for developing internalizing problems.     

Using social cognitive theory to predict physical activity and fitness in underserved middle school children

Few researchers have used social cognitive theory and environment-based constructs to predict physical activity (PA) and fitness in underserved middle-school children. Hence, we evaluated social cognitive variables and perceptions of the school environment to predict PA and fitness in middle school children (N = 506, ages 10-14 years). Using multiple regression analyses we accounted for 12% of the variance in PA and 13-21% of the variance in fitness. The best predictors of PA were barrier self-efficacy, classmate social support, and gender; whereas, only gender predicted fitness. The results affirmed the importance of barrier self-efficacy and gender differences. Our findings regarding classmate social support are some of the first to illuminate the importance of school-specific peers in promoting PA.     

Professional development design: Embedding educational reform in New Zealand

Teacher professional development variously supports ongoing skill development, new knowledge, and systems change. In New Zealand, the implementation of major assessment reforms in senior secondary schools provided opportunity to investigate teacher professional development as a function of the particular stage of an educational reform. Multi-method data sources including teacher surveys and school case studies were employed to evaluate professional development during the embedding stage of a standards-based assessment system, revealing a positive relationship between professional satisfaction and teacher involvement in setting priorities for the professional development. Other positive features were networking, personalized learning, and facilitator expertise. This research illustrates the importance of tailoring professional learning to implementation phase of an organizational change.     

A simple and inexpensive enteric-coated capsule for delivery of acid-labile macromolecules to the small intestine

Understanding the ecology of the gastrointestinal tract and the impact of the contents on the host mucosa is emerging as an important area for defining both wellness and susceptibility to disease. Targeted delivery of drugs to treat specific small intestinal disorders such as small bowel bacterial overgrowth and targeting molecules to interrogate or to deliver vaccines to the remote regions of the small intestine has proven difficult. There is an unmet need for methodologies to release probes/drugs to remote regions of the gastrointestinal tract in furthering our understanding of gut health and pathogenesis. In order to address this concern, we need to know how the regional delivery of a surrogate labeled test compound is handled and in turn, if delivered locally as a liquid or powder, the dynamics of its subsequent handling and metabolism. In the studies we report on in this paper, we chose ¹³C sodium acetate (¹³C-acetate), which is a stable isotope probe that once absorbed in the small intestine can be readily measured non-invasively by collection and analysis of ¹³CO₂ in the breath. This would provide information of gastric emptying rates and an indication of the site of release and absorptive capacity. In a series of in vitro and in vivo pig experiments, we assessed the enteric-protective properties of a commercially available polymer EUDRAGIT®L100-55 on gelatin capsules and also on DRcaps®. Test results demonstrated that DRcaps®coated with EUDRAGIT®L100-55 possessed enhanced enteric-protective properties, particularly in vivo. These studies add to the body of knowledge regarding gastric emptying in pigs and also begin the process of gathering specifications for the design of a simple and cost-effective enteric-coated capsule for delivery of acid-labile macromolecules to the small intestine.     

International Communication

TRACING NEW ORBITS: COOPERATION AND COMPETITION IN GLOBAL SATELLITE DEVELOPMENT edited by Donna A. Demac (New York: Columbia University Press, 1986—$35.00)

ISSUES IN INTERNATIONAL TELECOMMUNICATIONS: GOVERNMENT REGULATION OF COMSAT by Leland L. Johnson (Santa Monica, CA: Rand Corp., 1987—price not given, paper)

TECHNOLOGICAL FRONTIERS AND FOREIGN RELATIONS edited by Anne G. Keatley (1985—$19.95, paper, 306 pp.)

THE COMPETITIVE STATUS OF THE U.S. ELECTRONICS INDUSTRY: A STUDY OF THE INFLUENCES OF TECHNOLOGY IN DETERMINING INTERNATIONAL INDUSTRIAL COMPETITIVE ADVANTAGE (1984—$10.95, 126 pp.)

THE POLITICAL ECONOMY OF INTERNATIONAL TECHNOLOGY TRANSFER edited by John R. McIntyre and Daniel S. Papp (Westport, CT: Quorum Books/Greenwood Press, 1986—$45.00)

SCIENCE AND TECHNOLOGY IN THE USA by Albert Teich and Jill Pace (Detroit: Gale Research, 1986—$95)     

Modeling the Interrelationships Among Pre-service Science Teachers’ Understanding and Acceptance of Evolution, Their Views on Nature of Science and Self-Efficacy Beliefs Regarding Teaching Evolution

This study proposed a path model of relationships among understanding and acceptance of evolution, views on nature of science, and self-efficacy beliefs regarding teaching evolution. A total of 415 pre-service science teachers completed a series of self-report instruments for the specified purpose. After the estimation of scale scores using unidimensional IRT models, path analysis suggested that sophisticated views on NOS were associated with higher levels of both understanding and acceptance of evolution, and the higher level of understanding of evolution was related to the higher level of acceptance of evolution. Besides, higher levels of both understanding and acceptance of the theory and na?ve views on NOS were found to be associated with stronger self-efficacy beliefs for teaching evolution effectively.     

Motivated Attention and Reward in Parenting

Parenting has a significant and lasting impact on child development. From birth, parents must sensitively and appropriately attend to their infant’s emotional expressions and vocalizations. Accumulating evidence indicates that these infant cues of emotion attract more attention than equivalent adult cues in parents as well as non-parents. We review this evidence and suggest that infant cues hold high incentive value and elicit motivated attention (i.e., enhanced processing of motivationally relevant stimuli), which in turn promotes approach motivation and thus caregiving responses. Further, we discuss data suggesting that infant cues are salient for non-parents, with increasing motivated attention to infant cues in the transition to parenthood. This increase may depend on interactions between the dopamine reward system and the neuropeptide oxytocin. Therefore, we also explore the human and non-human data that support this association and consider potential sources of variability in motivated attention in parents.