Agreement between Polar and SRM mobile ergometer systems during laboratory-based high-intensity,intermittent cycling activity

Abstract

The purpose of this study was to assess the agreement between two mobile cycle ergometer systems for recording high-intensity, intermittent power output. Twelve trained male cyclists (age 31.4 ± 9.8 years) performed a single 3 min intermittent cycle test consisting of 12 all-out efforts, separated by periods of passive recovery ranging from 5 to 15 s. Power output was recorded using a Polar S710 heart rate monitor and power sensor kit and an SRM Powercrank system for each test. The SRM used torque and angular velocity to calculate power, while the S710 used chain speed and vibration to calculate power. Significant differences (P < 0.05) in power were found at 8 of the 12 efforts. A significant difference (P = 0.001) was also found when power was averaged over all 12 intervals. Mean power was 556 ± 102 W and 446 ± 61 W for the SRM and S710 respectively. The S710 underestimated power by an average of 23% with random errors of ?/÷ 24% when compared with the SRM. Random errors ranged from 36% to 141% with a median of 51%. The results indicate there was little agreement between the two systems and that the Polar S710 did not provide a valid measure of power during intermittent cycling activity when compared with the SRM. Power recorded by the S710 system was influenced greatly by chain vibration and sampling rates.     

Interpreting Scores from Standardized Tests

This essay seeks to establish a metaphor of the professional practice of teaching to the attributes and training of an offensive lineman in the game of American football. Effective classroom instruction does not rely exclusively on a rare set of talents but rather rests on the commitment to the work of teaching. Like the position of offensive lineman, the profession of teaching is one of service. And more, it is one in which the person's performance can blossom through intense determination. An invitation is offered to serve as an effective teacher.     

Student attitudes toward closed-circuit instructional television

Summary The objectives of this study were to examine (1) the relative effectiveness of closed-circuit television for classroom teaching compared to conventional teaching and (2) the acceptability of closed-circuit television teaching to the students. A course was offered both by closed-circuit television and by conventional teaching. Students within each group were asked to rate the course and other related concepts. In addition, their examination grades were obtained. No differences were found with respect to performance. The students taught via television rated the course and their instructors relatively lower than those who received conventional instruction. Howard M. Bobren is assistant to the director, Institute of Communications Research and Sheldon L. Siegel is research assistant, College of Education, both at the University of Illinois.     

Authoring Student Voices on College Preparedness: A Case Study

African American students continue to attend college at much lower rates than their white, Asian, and Latino counterparts. Although researchers have examined this issue from a multitude of vantage points, the voices of students—particularly students of color—have been limited in this research. Using a counter-storytelling narrative approach, this study examines what urban African American high school students identify as the critical factors affecting their educational trajectory and college-going prospects. Findings from the current study reveal that students identified inadequate resources, tracking, lack of AP courses, and poor teachers as factors that influenced their high school to college transition. This study provides much needed insight into the discourse on school reform from the most important constituent in schools—the students.     

Designing and using an organisational culture inquiry tool to glimpse the relational nature of leadership and organisational culture within a South Australian primary school

This case study research found that the relational leadership and organisational culture at a public primary school situated in a high poverty location in South Australia was built upon the strength of the inter-relationships between the teachers, teachers and leadership, and between teachers and students. Supported by what we called ‘dynamic inter-relationships’ and a ‘commitment to ongoing growth’ manifesting as key themes across the qualitative survey data generated by the school’s participants, we found the individual strengths of staff served the ‘on-going formation of organisational life’. Cognisant of these disclosed relational underpinnings, the research provided recommendations to the school’s leadership team about how they could best progress their educational reform agenda. The findings affirmed an Appreciative Inquiry inspired approach designed for the research was ‘fit for purpose’ as it generated extensive qualitative data from the teachers and leaders, offering opportunity for deep interpretive analysis using hermeneutic methodology of the school’s relational leadership and organisational culture. The research findings were subsequently confirmed by the teachers and leaders through a dialogic presentation of the research findings as an accurate representation of the culture of their school.     

Examining the influence of the parent-initiated and coach-created motivational climates upon athletes' perfectionistic cognitions

The aims of this study are threefold. First, we investigate the influence of the parent-initiated motivational climate upon elite junior athletes' perfectionistic cognitions. Second, we examine whether the coach-created motivational climate predicts additional variance in elite junior athletes' perfectionistic cognitions beyond the effects associated with the parent-initiated motivational climate. Third, we test the moderating role of athletes' gender and age in the relationship between the parent-initiated and coach-created motivational climates and athletes' perfectionistic cognitions. A total of 190 elite junior athletes (mean age 15.2 years, s?=?1.5, range 10-18) completed the Parent-Initiated Motivational Climate Questionnaire-2 (White & Duda, 1993), the Perceived Motivational Climate in Sport Questionnaire-2 (Newton, Duda, & Yin, 2000), and the Perfectionistic Cognitions Inventory (Flett, Hewitt, Blankstein, & Gray, 1998). Regression analyses revealed that mother- and father-initiated worry-conducive climates, the father-initiated success-without-effort climate, and the coach-created performance motivational climate predicted male athletes' perfectionistic cognitions. Female athletes' perfectionistic cognitions were predicted by the mother-initiated worry-conducive climate, father-initiated learning-enjoyment climate, and both dimensions of the coach-created climate. Finally, athletes' gender emerged as a significant moderator of the mother-initiated worry-conducive climate and athletes' perfectionistic cognitions relationship. Findings confirm that the parent-initiated motivational climate is a significant predictor of athletes' perfectionism-related thoughts, and provide initial support for the influence of the coach-created motivation climate over children's perfectionistic cognitions.     

The efficacy of a computer-adaptive reading program on grade 5 students’ reading achievement scores

Education and Information Technologies - Reading in upper-elementary grades includes comprehending complex texts and learning disciplinary-specific vocabulary. This study aims to determine the...