Identifying the optimal resistive load for complex training in male rugby players

Alternating a resistance exercise with a plyometric exercise is referred to as "complex training". In this study, we examined the effect of various resistive loads on the biomechanics of performance of a fast stretch-shortening cycle activity to determine if an optimal resistive load exists for complex training. Twelve elite rugby players performed three drop jumps before and after three back squat resistive loads of 65%, 80%, and 93% of a single repetition maximum (1-RM) load. All drop jumps were performed on a specially constructed sledge and force platform apparatus. Flight time, ground contact time, peak ground reaction force, reactive strength index, and leg stiffness were the dependent variables. Repeated-measures analysis of variance found that all resistive loads reduced (P < 0.01) flight time, and that lifting at the 93% load resulted in an improvement (P < 0.05) in ground contact time and leg stiffness. From a training perspective, the results indicate that the heavy lifting will encourage the fast stretch-shortening cycle activity to be performed with a stiffer leg spring action, which in turn may benefit performance. However, it is unknown if these acute changes will produce any long-term adaptations to muscle function.     

Exploring associations between supervisory support,teacher burnout and classroom emotional climate: the moderating role of pupil teacher ratio

Abstract

In previous studies on classroom emotional climate (CEC), factors related to teacher’s working conditions have rarely been included. Thus, in the current study, we examined associations between supervisory support, teacher burnout and CEC, and whether pupil teacher ratio (PTR) moderated this association, applying a randomised-control trial design. Participants were students from 300 classes at the end of grade 1, and 300 teachers. Structural equation modelling (SEM) revealed significant relations between supervisory support and teacher burnout and between teacher burnout and CEC. Supervisory support was indirectly related to CEC through teacher burnout. Finally, PTR moderated the association between teacher burnout and CEC.     

Retrospective Enhancement of Thesis Cataloging and the Match Rate of Authors in National Authority Files

Abstract

The researchers extracted a disproportionate stratified random sample from 40?years of thesis bibliographic records at Concordia University in Montreal, Quebec. Match rates for thesis authors in the LC/NACO Name Authority File and in Canadiana Authorities were examined. ProQuest digitization of older theses, the creation of an institutional repository, the move to electronic theses and dissertations in 2011, and the implementation of vendor-assisted authority control in 2017 impacted bibliographic records. In addition to the dearth of matches in general, results uncovered false matches and significant changes to Library and Archives Canada thesis authority control practices over the years.     

Opportunities and threats: A security assessment of state e-government websites

This study assessed the security of the U.S. state e-government sites to identify opportunities for and threats to the sites and their users. The study used a combination of three methods – web content analysis, information security auditing, and computer network security mapping – for data collection and analysis. The findings indicate that most state e-government sites posted privacy and security policy statements; however, only less than half stated clearly what security measures were in action. Second, the information security audit revealed that 98% of the sites secured users' accounts with SSL encryption for data transmission, and the sites' search tools enable public users to search for public information only. Third, although the sites had most of their internet ports filtered or behind firewalls, all of them had their main IP addresses detected and their port 80/tcp open. The study discussed the threats and opportunities and suggested possible solutions for improving e-government security.     

KINDERGARTEN SOCIAL WITHDRAWAL AND READING ACHIEVEMENT: A CROSS‐LAGGED PATH MODEL FOR AT‐RISK LEARNERS

The association between social withdrawal, school adjustment, and academic functioning in preschool and school entry is well‐established. Children who experience social withdrawal in primary grades are at risk for decreased academic performance. The bidirectional relationships among early literacy and social withdrawal in primary grades have not been examined to date. The present study used a cross‐lagged model to examine the relationship between social withdrawal and early literacy skills from kindergarten to second grade (N = 137). Results indicated that kindergarten social withdrawal predicted second grade reading achievement after controlling for prior literacy skill acquisition. Bidirectional influence hypotheses were not confirmed in the present study.     

Triathlon transition study: quantifying differences in running movement pattern and precision after bike-run transition

Various publications discuss the discrepancies of running in triathlons and stand-alone runs. However, those methods, such as analysing step-characteristics or ground-contact time, lack the ability to quantitatively discriminate between subtle running differences. The attractor method can be applied to overcome those shortcomings. The purpose was to detect differences in athletes’ running patterns (δM) and movement precision (δD) by comparing a 5,000 m run after a prior cycling session (TRun) with an isolated run over the same distance (IRun). Participants completed the conditions on a track and a stationary trainer, allowing the use of their personal bike to simulate an Olympic triathlon. During each run, three-dimensional acceleration data, using sensors attached to the ankles, were collected. Results showed that both conditions lead to elevated attractor parameters (δM and δD) over the initial five minutes before the athletes found their rhythm. This generates a new perspective because independent of running after a bike session or without preload, an athlete needs certain time to adjust to the running movement. Coaches must consider this factor as another tool to fine-tune pacing and performance. Moreover, the attractor method is a novel approach to gain deeper insight into human cyclic motions in athletic contexts.