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Thomas A. Wackwitz Clare L. Minahan Trish King Chantelle Du Plessis Mark H. Andrews Phillip M. Bellinger 《Journal of sports sciences》2021,39(1):84-90
ABSTRACT This study aimed to compare mechanical variables derived from torque-cadence and power-cadence profiles established from different cycle ergometer modes (isoinertial and isokinetic) and modelling procedures (second- and third-order polynomials), whilst employing a novel method to validate the theoretical maximal power output (Pmax). Nineteen well-trained cyclists (n = 12 males) completed two experimental sessions comprising six, 6-s maximal isoinertial or isokinetic cycling sprints. Maximal pedal strokes were extracted to construct power–cadence relationships using second- and third-order polynomials. A 6-s sprint at the optimal cadence (Fopt) or optimal resistance (Topt) was performed to assess construct validity of Pmax. No differences were found in the mechanical parameters when derived from isokinetic (Pmax = 1311 ± 415, Fopt = 118 ± 12) or isoinertial modes (Pmax = 1320 ± 421, Fopt = 116 ± 19). However, R2 improved (P < 0.02) when derived from isoinertial sprints. Third-order polynomial modelling improved goodness of fit values (Standard Error, adjusted R2), but derived similar mechanical parameters. Finally, peak power output during the optimised sprint did not significantly differ from the theoretical Pmax in both cycling modes, thus providing construct validity. The most accurate P-C profile can be derived from isoinertial cycling sprints, modelled using third-order polynomial equations. 相似文献
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We examined the information processing capabilities of children diagnosed with the inattentive subtype of attention-deficit/hyperactivity disorder (ADHD) who had been characterized as having a sluggish cognitive tempo. Children referred for school-related problems (n = 81) and nonreferred community controls (n = 149) participated. Of the referred children, 24 met criteria for ADHD, 42 met criteria for reading disability (RD), and 9 of these were comorbid for RD and ADHD. Children with ADHD differed from those without ADHD on a visual search task but not on an auditory processing task; the reverse was true for children with RD. Decomposition of the visual search task into component operations demonstrated that children in the ADHD group had a slow processing rate that was not attributable to inattention. The children with ADHD were not globally poor at information processing or inattentive, but they demonstrated diminished speed of visual processing. 相似文献
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Sweat lactate reflects eccrine gland metabolism. However, the metabolic tendencies of eccrine glands in a hot versus thermoneutral environment are not well understood. Sixteen male volunteers completed a maximal cycling trial and two 60-min cycling trials [30°C?=?30±1°C and 18°C?=?18±1°C wet bulb globe temperature (WBGT)]. The participants were requested to maintain a cadence of 60 rev?·?min?1 with the intensity individualized at ～ 90% of the ventilatory threshold. Sweat samples at 10, 20, 30, 40, 50 and 60?min were analysed for lactate concentration. Sweat rate at 30°C (1380±325?ml?·?h?1) was significantly greater (P<0.05) than at 18°C (632±311?ml?·?h?1). Sweat lactate concentration was significantly greater (P<0.05) at each time point during the 18°C trial, with values between trials tending to converge across time. During the 30°C trial, both heart rate (20, 30, 40, 50 and 60?min) and rectal temperature (30, 40, 50 and 60?min) were significantly higher than in the 18°C trial. Higher sweat lactate concentrations coupled with lower sweat rates may indicate a greater relative contribution of oxygen-independent metabolism within eccrine glands during exercise at 18°C. Decreases in sweat lactate concentration across time suggest either greater dilution due to greater sweat volume or increased reliance on aerobic metabolism within eccrine glands. The convergence of lactate concentrations between trials may indicate that time-dependent modifications in sweat gland metabolism occur at different rates contingent partially on environmental conditions. 相似文献
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James Clyde Diperna Puiwa Lei Jillian Bellinger Weiyi Cheng 《Psychology in the schools》2016,53(2):189-203
The purpose of this study was to examine the impact of a universal program to promote positive classroom behavior on students’ approaches to learning and early academic skills. Second grade classrooms (N = 39) were randomly assigned to treatment and business‐as‐usual control conditions. Teachers in intervention classrooms implemented the Social Skills Improvement System Classwide Intervention Program (SSIS‐CIP) over a 12‐week period. Participating students’ (N = 494) engagement, motivation, and academic skills were assessed before and after treatment implementation. Results indicated that students with lower levels of engagement and motivation at pretest experienced significant improvement in these areas after exposure to the SSIS‐CIP. Although no significant differences were observed in reading, students receiving supplemental instructional services demonstrated greater gains in mathematics than did their peers in the control condition. 相似文献
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Weiler MD Harris NS Marcus DJ Bellinger D Kosslyn SM Waber DP 《Journal of learning disabilities》2000,33(6):538-550
Children referred for evaluation of learning impairment (LI, N =100) and a comparison group of nonreferred (NLI, N = 243) children were evaluated on a visual filtering task. The task was designed hierarchically to provide for evaluation of component operations-serial search, parallel search, decision, and response. With each additional processing demand, response times increased disproportionately for the LI group relative to the NLI group. Overall response time reliably predicted academic skills and cognitive ability, but was more strongly related to group membership. Thus, this nonverbal visual task is sensitive to a characteristic of children with learning problems over and above discrete academic and cognitive skills. Children with problems adapting to the demands of schooling may be distinguished by a disproportionate vulnerability to processing load. 相似文献
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Skylar A. Bellinger Steven W. Lee T. Rene Jamison R. Matthew Reese 《Journal of educational and psychological consultation》2016,26(2):139-165
A plethora of literature suggests that collaborative partnerships among families, educators, and outside service providers are necessary and beneficial to address behavior problems, but there continues to be a lack of coordination among these stakeholders. The current study used conjoint behavioral consultation (CBC) to facilitate the development and implementation of collaborative intervention plans. Parents, teachers, and an outside mental health provider worked together to create and support behavioral intervention plans that were implemented at home and school. The results of this multiple baseline study indicate that collaborative interventions developed through the CBC process were effective in improving behavior at home and school. More specifically, visual analysis of the data, along with calculated effect sizes, showed an increase in the percentage of time that all 3 participants complied with expectations during problematic routines at home and school. Implications, limitations, and future research directions are discussed. 相似文献
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Chia‐Chih DC Wang Makini L. King Nicholas R. Debernardi 《Journal of College Counseling》2012,15(2):101-116
This study examined the relationships between adult attachment, cognitive appraisal, and university students' behavioral and emotional reactions to infidelity situations in romantic relationships. Results based on 173 university students suggested that both attachment and cognitive appraisals significantly predicted distinct types of infidelity reactions and that participants' cognitive appraisal mediated the effects of attachment on behavioral and emotional reactions. Counseling applications for university counselors are discussed on the basis of attachment perspectives and cognitive appraisal models. 相似文献
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This study examined the reliability and validity of scores on a fluency‐based measure of reading comprehension. The Dynamic Indicators of Basic Early Literacy Skills (DIBELS; 6th ed. revised) Retell Fluency (RTF), Oral Reading Fluency (DORF), and Woodcock Johnson III NU Tests of Achievement (WJ‐III NU ACH) Reading Comprehension measures were administered to fourth‐grade students. Results indicated a large difference between real time and recorded retell fluency scores for each passage. In addition, students' retell fluency scores had a low correlation with their reading comprehension scores. In light of these findings, practitioners may want to exercise caution in using fluency‐based story‐retell scores as a measure of reading comprehension. © 2011 Wiley Periodicals, Inc. 相似文献
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β-alanine is a common ingredient in supplements consumed by athletes. Indeed, athletes may believe that the β-alanine induced paresthesia, experienced shortly after ingestion, is associated with its ergogenic effect despite no scientific mechanism supporting this notion. The present study examined changes in cycling performance under conditions of β-alanine induced paresthesia. Eight competitive cyclists (VO2max = 61.8 ± 4.2 mL·kg·min?1) performed three practices, one baseline and four experimental trials. The experimental trials comprised a 1-km cycling time trial under four conditions with varying information (i.e., athlete informed β-alanine or placebo) and supplement content (athlete received β-alanine or placebo) delivered to the cyclist: informed β-alanine/received β-alanine, informed placebo/received β-alanine, informed β-alanine/received placebo and informed placebo/received placebo. Questionnaires were undertaken exploring the cyclists’ experience of the effects of the experimental conditions. A possibly likely increase in mean power was associated with conditions in which β-alanine was administered (±95% CL: 2.2% ± 4.0%), but these results were inconclusive for performance enhancement (p = 0.32, effect size = 0.18, smallest worthwhile change = 56% beneficial). A possibly harmful effect was observed when cyclists were correctly informed that they had ingested a placebo (–1.0% ± 1.9%). Questionnaire data suggested that β-alanine ingestion resulted in evident sensory side effects and six cyclists reported placebo effects. Acute ingestion of β-alanine is not associated with improved 1-km TT performance in competitive cyclists. These findings are in contrast to the athlete’s “belief” as cyclists reported improved energy and the ability to sustain a higher power output under conditions of β-alanine induced paresthesia. 相似文献