Pre-cooling moderately enhances visual discrimination during exercise in the heat     

Neil D. Clarke  Michael J. Duncan  Mike Smith  Joanne Hankey 《Journal of sports sciences》2017,35(4):355-360

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Low fundamental movement skill proficiency is associated with high BMI and body fatness in girls but not boys aged 6–11 years old     

Michael J. Duncan  Elizabeth Bryant  David Stodden 《Journal of sports sciences》2017,35(21):2135-2141

This study examined differences in children’s body mass index (BMI) and body fatness (BF%) as a function of gender and fundamental movement skill (FMS) proficiency. Following ethics approval and parental consent, 248, 6–11 year-old children (112 boys, 136 girls) underwent assessment of 7 FMS: sprint run, side gallop, hop, kick, catch, throw and vertical jump. FMS tertiles (“high”, “medium” or “low” FMS) were created based on the summed components of the FMS. Skinfold measures were used to calculate BF%. Physical activity (PA) was assessed using pedometry and maturation predicted using anthropometry. Data were analysed using a 2 (Gender) × 3 (FMS tertile) ways analysis of covariance (ANCOVA), controlling for age, maturation and PA. Age (P = .001) and maturation (P = .006) were associated with BMI. Girls classified as high FMS proficiency had significantly lower BMI compared to girls with low and medium FMS proficiency. Age (P = .0001) and maturation (P = .007) were associated with BF%. BF% was also higher for girls with low FMS compared to those with medium and high FMS. BF% and BMI were not different across FMS tertile in boys. Such findings suggest focusing on FMS may be especially important for healthy weight, particularly in girls.  相似文献   

Analyzing and Selecting Instructional Strategies and Tactics Originally published in 1991, PIQ 4.2     

David H. Jonassen  R. Scott Grabinger  N. Duncan C. Harris 《Performance Improvement Quarterly》1997,10(1):34-54

“Formulation of instructional strategy to match subject matter and learner requirements” is an integral part of most instructional design models (Andrews & Goodson, 1980, p.5). Yet the meaning and purpose of instructional strategies in these design models vary considerably. An instructional strategy in traditional design models usually refers to the selection of instructional delivery vehicles (e.g., lecture, demonstration, computer-assisted instruction) and support activities (e.g., practice exercises, tutoring) (cf. Tracey, Flynn, & Legere, 1970). Contrast those conceptions with the many instructional strategies described in elaboration theory (Reigeluth & Stein, 1983), such as subsumptive sequencing, internally consistent orienting structures, synthesizers, summarizers, and cognitive strategy activators. What is obvious from these disparate conceptions is that instructional designers do not share a consistent definition of instructional strategies. Many of the activities that are referred to as instructional strategies are not in fact strategies, but rather are presentation vehicles. In this article, we first define instructional strategies and tactics in the context of an iterative design model. Instructional strategies are then distinguished from instructional tactics, which are the implementation of strategies. We then list the range of instructional strategies and tactics that implement them. Finally, we provide a decision tree for assisting designers to select appropriate instructional tactics.  相似文献   

World-Rank and/or Locally Relevant? Organizational Identity in the Mission Statements of Higher Education Organizations in Israel, 2008–2018     

Mizrahi-Shtelman  Ravit  Drori  Gili S. 《Minerva》2021,59(1):1-25

Minerva - Israeli higher education organizations are currently under pressure to achieve global excellence, satisfy Israeli economic and security needs, and serve Israel’s diverse social...  相似文献   

Binge-eating and vomiting: A survey of a high school population     

Jo A. Carter  Pamela A. Duncan 《Psychology in the schools》1984,21(2):198-203

A survey of 421 high school females was conducted to determine the prevalence of the binge/purge practice, bulimia, an eating disorder. Teenage vomiters in this study were found to have higher levels of somatic symptoms, anxiety, social dysfunction, and depression than did nonvomiters. They were also found to have disturbed attitudes toward food, eating, and dieting. Of the vomiters, 58% scored above the threshold score that indicates the presence of psychological and behavioral symptoms characteristic of anorexia nervosa. The findings provide information useful to school personnel who work with the social, behavioral, and academic problems of adolescents.  相似文献   

On Mr. Williams' method of manufacturing patent felted cloth     

J. Duncan 《Journal of The Franklin Institute》1844,37(3):203

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The effect of acute caffeine ingestion on upper body anaerobic exercise and cognitive performance     

Michael J. Duncan  Alexandra P. Dobell  Chloe L. Caygill  Emma Eyre  Jason Tallis 《European Journal of Sport Science》2019,19(1):103-111

Abstract

The current study examined the effect of acute caffeine ingestion on mean and peak power production during upper body Wingate test (WANT) performance, rating of perceived exertion, readiness to invest effort and cognitive performance. Using a double-blind design, 12 males undertook upper body WANTs, following ingestion of caffeine (5?mg*kg^?1) or placebo. Pre-substance ingestion, 60?mins post substance ingestion and post exercise participants completed measures of readiness to invest physical and mental effort and cognitive performance. Peak power was significantly higher (P?=?.026), fatigue index greater (P?=?.02) and rating of perceived exertion lower (P?=?.025) in the presence of caffeine. Readiness to invest physical effort was also higher (P?=?.016) in the caffeine condition irrespective of time point (pre, 60?mins post ingestion and post exercise). Response accuracy for incongruent trials on the Flanker task was superior in the presence of caffeine (P?=?.006). There was a significant substance?×?time interaction for response speed in both congruent and incongruent conditions (both P?=?.001) whereby response speeds were faster at 60?mins post ingestion and post exercise in the caffeine condition, compared to placebo. This is the first study to examine the effects of caffeine ingestion on this modality of exercise and suggests that caffeine ingestion significantly enhances peak power, readiness to invest physical effort, and cognitive performance during WANT performance.  相似文献   

The Via Media of American Museum Practice: Henry Watson Kent and the Metropolitan Museum of Art     

Sally Anne Duncan 《Curator: The Museum Journal》2005,48(3):301-316

Speculation about the character and purposes of American art museums has occasioned intense debate since their inception—never more so than today. Whether to be elitist or populist, object‐based or audience‐based forms the crux of many heated arguments. This article asserts that, in the midst of competing philosophies, the successful American art museum has in reality grown from an amalgam of ideas that form a via media or middle path, far more inclusive and pragmatic than is usually noted. This comprehensive philosophy is most effectively demonstrated in the work of Henry Watson Kent at the Metropolitan Museum of Art in New York during the first decades of the twentieth century. The work of Kent and his colleagues at the Metropolitan Museum is here examined as a paradigm for the via media museum practice that speaks to the aspirations of America's current art museum leadership.  相似文献   

The effect of badminton-specific exercise on badminton short-serve performance in competition and practice climates     

Michael J. Duncan  Cheryl K.Y. Chan  Neil D. Clarke  Martin Cox  Mike Smith 《European Journal of Sport Science》2017,17(2):119-126

This study examined the effects of changes in physiological and psychological arousal on badminton short-serve performance in competitive and practice climates. Twenty competitive badminton players (10 males and 10 females) volunteered to participate in the study following ethics approval. After familiarisation, badminton short-serve performance was measured at rest, mid-way through and at the end of a badminton-specific exercise protocol in two conditions; competition vs. practice. Ratings of cognitive and somatic anxiety were assessed at three time points prior to badminton short-serve performance using the Mental Readiness Form 3. Heart rate and rating of perceived exertion (RPE) were assessed during the exercise protocol. Results indicated that better short-serve performance was evident in practice compared to competition (P?=?.034). RPE values were significantly higher in the competition condition compared to practice (P?=?.007). Cognitive anxiety intensity was significantly lower post-exercise in the practice condition compared to competition (P?=?.001). Cognitive anxiety direction showed greater debilitation post-exercise in the competition condition compared to practice (P?=?.01). Somatic anxiety intensity increased from pre-, to mid- to post-exercise (P?=?.001) irrespective of condition. This study suggests that badminton serve performance is negatively affected when physiological arousal, via badminton-specific exercise, and cognitive anxiety, via perceived competition, are high.  相似文献   

Comparing physical activity estimates in children from hip-worn Actigraph GT3X+ accelerometers using raw and counts based processing methods     

Duncan S. Buchan  Gillian McLellan 《Journal of sports sciences》2019,37(7):779-787

This study examined differences in physical activity (PA) estimates provided from raw and counts processing methods. One hundred and sixty-five children (87 girls) wore a hip-mounted ActiGraph GT3X+ accelerometer for 7 days. Data were available for 129 participants. Time in moderate PA (MPA), vigorous PA (VPA) and moderate-vigorous PA (MVPA) were calculated using R-package GGIR and ActiLife. Participants meeting the wear time criteria for both processing methods were included in the analysis. Time spent in MPA (?21.4 min.d^?1, 95%CI ?21 to ?20) and VPA (?36 min.d^?1, 95%CI ?40 to ?33) from count data were higher (P < 0.001) than raw data. Time spent in MVPA between the two processing methods revealed significant differences (All P < 0.001). Bland-Altman plots suggest that the mean bias for time spent in MPA, VPA and MVPA were large when comparing raw and count methods. Equivalence tests showed that estimates from raw and count processing methods across all activity intensities lacked equivalence. Lack of equivalence and poor agreement between raw and count processing methods suggest the two approaches to estimate PA are not comparable. Further work to facilitate the comparison of findings between studies that process and report raw and count physical activity data may be necessary.  相似文献