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Jeffrey M. McBride Tracie L. Haines Tyler J. Kirby 《Journal of sports sciences》2013,31(11):1215-1221
Abstract Nine males (age 24.7 ± 2.1 years, height 175.3 ± 5.5 cm, body mass 80.8 ± 7.2 kg, power clean 1-RM 97.1 ± 6.36 kg, squat 1-RM = 138.3 ± 20.9 kg) participated in this study. On day 1, the participants performed a one-repetition maximum (1-RM) in the power clean and the squat. On days 2, 3, and 4, participants performed the power clean, squat or jump squat. Loading for the power clean ranged from 30% to 90% of the participant's power clean 1-RM and loading for the squat and jump squat ranged from 0% to 90% of the participant's squat 1-RM, all at 10% increments. Peak force, velocity, and power were calculated for the bar, body, and system (bar + body) for all power clean, squat, and jump squat trials. Results indicate that peak power for the bar, body, and system is differentially affected by load and movement pattern. When using the power clean, squat or jump squat for training, the optimal load in each exercise may vary. Throwing athletes or weightlifters may be most concerned with bar power, but jumpers or sprinters may be more concerned with body or system power. Thus, the exercise type and load vary according to the desired stimulus. 相似文献
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This study examined the extent to which (a) nine US history students developed historically-grounded perspectives, and (b) the entire class engaged itself in inclusive, moral debate about historical events and issues. Inductive methods were used in this micro-ethnographic study to construct and verify its themes though interview, classroom observation and student survey. Seven students demonstrated identifiable perspectives. History was viewed by these students as personally-constructed interpretations, not as value-free chronologies. Only one student's perspective, however, was historically-grounded; other perspectives were grounded in references to contemporary issues. Evidence of moral debate was limited totwo debates observed during 24 classroom observations. These two findings seemed interconnected: students with little historical grounding to their perspectives may have little inclination toward collective, ethical critique. Moral debate consisting of student exchange of diverse historically-grounded perspectives was not the classroom norm. The debates that went into the making of American society concerned not just institutions or governing principles, but the capacity of humans to sustain those institutions. Whatever the disagreements were over other issues at the American Constitutional Convention \[in Philadelphia in 1787], the fundamental question sensed by everyone … was whether the people themselves would understand what it meant to hold the ultimate power of society, and whether they had enough sense of history and destiny to know where they had been and where they ought to be going. (Cousins; cited by Goodlad 1979: 40; emphasis added) 相似文献
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Janalee Morris Tom Buchanan Janet Arnold Tracie Czerkawski Brad Congram 《Learning disabilities research & practice》2023,38(4):296-310
Academic accommodations for students experiencing disabilities are increasingly available at postsecondary institutions. More studies of the efficacy of accommodations for student success are warranted, however. Given the increased gender gap in university participation, more focus on the unique impact of gender is also needed. Using a sample of students registered with Access and Inclusion Services with learning disabilities (LD), attention-deficit/hyperactivity disorder (ADHD), and combined LD/ADHD at a Canadian undergraduate university (N = 661), we explored the impact of gender on academic performance and accommodation usage. Next, we examined how gender intersected with the impact of academic accommodations on academic performance. Women, on average, demonstrated better academic performance. Academic strategies and assistive technologies were not associated with higher academic performance. However, testing accommodations (extended time and environmental accommodations) were positively associated with academic performance for men with LD or ADHD, but not for the combined group LD/ADHD. For the former two, the more tests accommodated, the higher the academic performance. Furthermore, this gender association was most prominent for students experiencing ADHD. Interpretations and policy recommendations related to these findings are presented. 相似文献
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Haines TL McBride JM Triplett NT Skinner JW Fairbrother KR Kirby TJ 《Journal of sports sciences》2011,29(13):1435-1442
The purpose of this investigation was to compare valgus/varus knee angles during various jumps and lower body strength between males and females relative to body mass. Seventeen recreationally active females (age: 21.94 ± 2.59 years; height: 1.67 ± 0.05 m; mass: 64.42 ± 8.39 kg; percent body fat: 26.89 ± 6.26%; squat one-repetition maximum: 66.18 ± 19.47 kg; squat to body mass ratio: 1.03 ± 0.28) and 13 recreationally active males (age: 21.69 ± 1.65 years; height: 1.77 ± 0.07 m; mass: 72.39 ± 9.23 kg; percent body fat: 13.15 ± 5.18%; squat one-repetition maximum: 115.77 ± 30.40 kg; squat to body mass ratio: 1.59 ± 0.31) performed a one-repetition maximum in the squat and three of each of the following jumps: countermovement jump, 30 cm drop jump, 45 cm drop jump, and 60 cm drop jump. Knee angles were analysed using videography and body composition was analysed by dual-energy X-ray absorptiometry to allow for squat to body mass ratio and squat to fat free mass ratio to be calculated. Significant differences (P ≤ 0.05) were found between male and female one-repetition maximum, male and female squat to body mass ratio, and male and female squat to fat free mass ratio. Significant differences were found between male and female varus/valgus knee positions during maximum flexion of the right and left leg in the countermovement jump, drop jump from 30 cm, drop jump from 45 cm, and drop jump from 60 cm. Correlations between varus/valgus knee angles and squat to body mass ratio for all jumps displayed moderate, non-significant relationships (countermovement jump: r = 0.445; drop jump from 30 cm: r = 0.448; drop jump from 45 cm: r = 0.449; drop jump from 60 cm: r = 0.439). In conclusion, males and females have significantly different lower body strength and varus/valgus knee position when landing from jumps. 相似文献
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Tracie E. Costantino 《Educational theory》2004,54(4):399-417
In this article I examine Dewey's ambivalent attitude toward art museums — criticizing their existence as repositories for the rich, while exploring their educational potential — by analyzing Dewey's comments on museums in various texts, by relating his ideas to museum education theories and practice of the time, and by exploring his involvement with Albert Barnes and the Barnes Foundation. Specifically, I discuss how these men influenced each other and consider possible reasons for Dewey's involvement with a "capitalist collector" such as Barnes. This examination is placed within the broader context of Dewey's philosophy of art as experience. An analysis of these issues is especially relevant at the present time, given that museums are increasingly involved in K-12 education through outreach and professional development programs, in addition to school tours. 相似文献
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Tracie M. Addy Margaret R. Blanchard 《International Journal of Science Education》2013,35(8):1045-1071
ABSTRACTUsing data from the 2006 Program for International Student Assessment (PISA), we explored nine aspects of science engagement (science self-efficacy, science self-concept, enjoyment of science, general interest in learning science, instrumental motivation for science, future-oriented science motivation, general value of science, personal value of science, and science-related activities) as outcomes and predictors of science achievement. Based on results from multilevel modelling with 4456 students nested within 132 schools, we found that all aspects of science engagement were statistically significantly and positively related to science achievement, and nearly all showed medium or large effect sizes. Each aspect was positively associated with one of the (four) practices (strategies) of science teaching. Focus on applications or models was positively related to the most aspects of science engagement (science self-concept, enjoyment of science, instrumental motivation for science, general value of science, and personal value of science). Hands-on activities were positively related to additional aspects of science engagement (science self-efficacy and general interest in learning science) and also showed a positive relationship with science achievement. 相似文献
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Tracie O. Afifi Jonathan Boman William Fleisher Jitender Sareen 《Child abuse & neglect》2009,33(3):139-147
ObjectivesTo determine how the experiences of child abuse and parental divorce are related to long-term mental health outcomes using a nationally representative adult sample after adjusting for sociodemographic variables and parental psychopathology.MethodsData were drawn from the National Comorbidity Survey (NCS, n = 5,877; age 15–54 years; response rate 82.4%). Logistic regression models were used to determine the odds of experiencing lifetime psychiatric disorders and suicidal ideation and attempts.ResultsParental divorce alone was associated with some psychiatric disorders after adjusting for sociodemographic variables (AOR ranging from 1.30 to 2.37), while child abuse alone was associated with psychiatric disorders (AOR ranging from 1.39 to 6.07) and suicidal ideation (AOR = 2.08; 95% CI = 1.57–2.77) and attempts (AOR = 1.54; 95% CI = 1.02–2.31) after adjusting for sociodemographic variables. However, having experienced both parental divorce and child abuse together resulted in significantly increased odds for lifetime PTSD (AOR = 9.87; 95% CI = 6.69–14.55), conduct disorder (AOR = 4.01; 95% CI = 2.92–5.51) and suicide attempts (AOR = 2.74; 95% CI = 1.84–4.08) compared to having experienced either parental divorce or child abuse alone. These results were attenuated when further adjusting for parental psychopathology.ConclusionsWhen the experience of parental divorce is accompanied with child abuse, the associations with some poor mental health outcomes are significantly greater compared to the impact of either parental divorce or child abuse on its own. Therefore, parental divorce is an additional childhood adversity that significantly contributes to poor mental health outcomes especially when in combination with child abuse. Parental psychopathology attenuated these relationships suggesting that it may be one possible mechanism to explain the relationships between child abuse, parental divorce, and psychiatric disorders and suicide attempts. 相似文献
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