The effect of crank inertial load on the physiological and biomechanical responses of trained cyclists

The existing literature suggests that crank inertial load has little effect on the responses of untrained cyclists. However, it would be useful to be aware of any possible effect in the trained population, particularly considering the many laboratory-based studies that are conducted using relatively low-inertia ergometers. Ten competitive cyclists (mean VO(2max) = 62.7 ml x kg(-1) x min(-1), s = 6.1) attended the human performance laboratories at the University of Wolverhampton. Each cyclist completed two 7-min trials, at two separate inertial loads, in a counterbalanced order. The inertial loads used were 94.2 kg x m(2) (high-inertia trial) and 2.4 kg x m(2) (low-inertia trial). Several physiological and biomechanical measures were undertaken. There were no differences between inertial loads for mean peak torque, mean minimum torque, oxygen uptake, blood lactate concentration or perceived exertion. Several measures showed intra-individual variability with blood lactate concentration and mean minimum torque, demonstrating coefficients of variation > 10%. However, the results presented here are mostly consistent with previous work in suggesting that crank inertial load has little direct effect on either physiology or propulsion biomechanics during steady-state cycling, at least when cadence is controlled.     

Cornerstones and keystones: Humanities for the gifted and talented

The Humanities as a curriculum provide a natural learning environment where gifted students have opportunities to make intellectual inquiries in every realm of human endeavors.     

Convergence of views: Self‐perceptions of African American and White kindergartners

As the second in a series of studies concerning the development of kindergartners' self‐perceptions, this study examined the effects of the kindergarten experience on self‐perceptions of African American and White students as they progressed through their kindergarten year. Using a countywide sample of 209 children in 31 classrooms, the study incorporated in vivo observations of teachers' verbal behavior and self‐perception data from the Pictorial Scale of Perceived Competence and Social Acceptance for Young Children. Results indicate that the kindergarten experience had an equalizing effect on the self‐perceptions of African American and White children, although self‐perceptions of cognitive competence were initially lower for African American children than for their White counterparts. Teachers' verbal interactions with children were not affected by the child's race, at least when different achievement levels were taken into account. © 1999 John Wiley & Sons, Inc.     

The up-front legacies of France 2019: changing the face of ‘le foot féminin’

ABSTRACT

The drive to develop women’s football in France, a game 100 years old albeit one long-stigmatised, was thrust into high gear in 2011. Since then, a confluence of events and cultural changes, from on-field results and officials’ investment of greater resources to winning the 2019 World Cup host bid, greater mediatisation of women’s players, and more – including the spectacular 2010 meltdown of Les Bleus in South Africa – have combined to energise and grow the game. This newfound dynamism was unforeseen a decade ago and illustrates some of France’s biggest World Cup legacies: the up-front investments underpinning the sport’s development during the 2010s, and the ways the country has repackaged itself as a champion of women’s football and women in football, forever changing the face of ‘le foot féminin’.     

The Role of Preschool Relational and Physical Aggression in the Transition to Kindergarten: Links With Social-Psychological Adjustment

Research Findings: The transition to kindergarten has important ramifications for future achievement and psychosocial outcomes. Research suggests that physical aggression may be related to difficulty during school transitions, yet no studies to date have examined the role of relational aggression in these transitions. This article examines how engagement in preschool physical and relational aggression predict psychosocial adjustment during the kindergarten school year. Observations and teacher reports of aggression were collected in preschool, and kindergarten teachers reported on student–teacher relationship quality, child internalizing problems, and peer acceptance in kindergarten. Results suggested that preschool physical aggression predicted reduced peer acceptance and increased conflict with the kindergarten teacher. High levels of relational aggression, when not combined with physical aggression, were related to more positive transitions to kindergarten in the domains assessed. Practice or Policy: These data lend support to the need for interventions among physically aggressive preschoolers that target not only concurrent behavior but also future aggression and adjustment in kindergarten. Thus, educators should work to encourage social influence in more prosocial ways among aggressive preschoolers.     

The effects of an increasing versus constant crank rate on peak physiological responses during incremental arm crank ergometry

We examined the effects of concomitant increases in crank rate and power output on incremental arm crank ergometry. Ten healthy males undertook three incremental upper body exercise tests to volitional exhaustion. The first test determined peak minute power. The subsequent tests involved arm cranking at an initial workload of 40% peak minute power with further increases of 10% peak minute power every 2 min. One involved a constant crank rate of 70 rev · min(-1), the other an initial crank rate of 50 rev · min(-1) increasing by 10 rev · min(-1) every 2 min. Fingertip capillary blood samples were analysed for blood lactate at rest and exhaustion. Local (working muscles) and cardiorespiratory ratings of perceived exertion (RPE) were recorded at the end of each exercise stage. Heart rate and expired gas were monitored continuously. No differences were observed in peak physiological responses or peak minute power achieved during either protocol. Blood lactate concentration tended to be greater for the constant crank rate protocol (P = 0.06). Test duration was shorter for the increasing than for the constant crank rate protocol. The relationship between local RPE and heart rate differed between tests. The results of this study show that increasing cadence during incremental arm crank ergometry provides a valid assessment of peak responses over a shorter duration but alters the heart rate-local RPE relationship.     

Child care and low-income children's development: direct and moderated effects

A large literature has documented the influence of child care on young children's development, but few studies have examined low-income children in community care arrangements. Using data from Welfare, Children, and Families: A Three-City Study (N = 204), this study examined the influence of child care quality and the extent of care on low-income children's (ages 2-4 years) cognitive and socioemotional development over time. Higher levels of child care quality were modestly associated with improvements in children's socioemotional development, and extensive hours in child care were linked to increases in children's quantitative skills and decreases in behavior problems. Analyses suggest that child care quality may be particularly salient for subgroups of children from low-income families.