Effects of hyperoxia during recovery from 5×30-s bouts of maximal-intensity exercise

We test the hypothesis that breathing oxygen-enriched air (F(I)O(2) = 100%) maintains exercise performance and reduces fatigue during intervals of maximal-intensity cycling. Ten well-trained male cyclists (age 25 ± 3 years; peak oxygen uptake 64.8 ± 6.2 ml · kg(-1) · min(-1); mean ± s) were exposed to either hyperoxic or normoxic air during the 6-min intervals between five 30-s sessions of cycling at maximal intensity. The concentrations of lactate and hydrogen ions [H(+)], pH, base excess, oxygen partial pressure, and oxygen saturation in the blood were assessed before and after these sprints. The peak (P = 0.62) and mean power outputs (P = 0.83) with hyperoxic and normoxic air did not differ. The partial pressure of oxygen was 4.2-fold higher after inhaling hyperoxic air, whereas lactate concentration, pH, [H(+)], and base excess (P ≥ 0.17) were not influenced. Perceived exertion towards the end of the 6-min periods after the fourth and fifth sprints (P < 0.05) was lower with hyperoxia than normoxia (P < 0.05). These findings demonstrate that the peak and mean power outputs of athletes performing intervals of maximal-intensity cycling are not improved by inhalation of oxygen-enriched air during recovery.     

Responses of low and high compression during recovery after repeated sprint training in well-trained handball players

The aim of the study was to investigate the effects of wearing various levels of compression following repeated and exhausting sprint exercise on variables related to recovery. Twelve well-trained handball players performed three sessions of repeated and exhausting sprint exercise (30?×?30m). Directly after each session the participants wore tights extending from below the hip to the foot with either 0, 10, or 25?mm?Hg of compression onto the thigh and calf muscles. 48?h after the training session all participants performed 5?×?30m sprints and counter movement jumps. Before, directly after, 24?h, and 48?h after the training session venous blood samples were drawn for the determination of creatine kinase (CK), urea, C-reactive protein (CRP). At the same time points, subjective ratings of the Acute Recovery and Stress Scale (ARSS) questionnaires were obtained. The results for plasma concentrations of CK and urea showed ‘likely’ to ‘very, very likely’ beneficial effects for compression garments exerting 10?mm?Hg of compression (p?=?0.06–1.0). With regard to sprint and jump performance no differences were evident between 0, 10, and 25?mm?Hg (p?=?0.07–1.0). In addition, subjective scores from the ARSS did not differ between conditions over time (p?>?0.05). We conclude that the application of 10?mm?Hg leg compression compared to 0 and 25?mm?Hg of compression during 48?h of recovery from repeated and exhausting sprints lowered the plasma concentrations of CK and urea with no improvements in recovery for performance.     

Hochintensives Intervalltraining im Sportunterricht

Background and aim

This study examined the effects of a 6-week high-intensity interval training (HIIT) vs. low-intensity endurance training (LOW), applied during physical education on motor performance, mood and perceived exertion.

Methods

Over a period of 6 weeks, 85 pupils (34 male; 51 female; age: 11.9?±?0.9 years) performed 11 sessions of either HIIT (20?min, intervals from 10?s to 4?min at about 90–100% of average running speed of 6?min run [v_mean]) or LOW (30?min, intervals from 6–25?min at about 65–85% v_mean). Before and after the 6?week intervention each pupils’ anthropometry and motor performance (20?m sprint, standing long-jump, lateral jumping from side to side, push-ups, sit-ups, 6?min run) were assessed. Session rating of perceived exertion (RPE) was recorded after each session and mood was assessed by questionnaire following the 3rd, 6th, 9th and 11th session.

Results

RPE (p?<?0.05) was higher and mood more positive (p?<?0.05) with HIIT compared to LOW. Performances in the 6?min run (p?<?0.001; part. η²?=?0.473), 20?m sprint (p?<?0.001; part. η²?=?0.226), standing long-jump (p?<?0.05; part. η²?=?0.056), push-ups (p?<?0.001; part. η²?=?0.523) and sit-ups (p?<?0.001; part. η²?=?0.146) improved following HIIT and LOW with no significant time?×?group interaction (except for the sit-ups [p?<?0.05; part. η²?=?0.048]).

Conclusions

HIIT and LOW improved the performances in 6?min run, 20?m sprint, standing long-jump and push-ups similarly. However, the improvements in HIIT compared to LOW were achieved in 30% less time. As time is limited in physical education classes, HIIT offers a new perspective for improving endurance and motor performance in children. The positive mood associated with HIIT demonstrates the applicability in physical education.

     

The role of sex differences in the referral process as measured by the Peabody Picture Vocabulary Test-Revised and the Wechsler Intelligence Scale for Children-Revised

The Peabody Picture Vocabulary Test-Revised (PPVT-R) and the Wechsler Intelligence Scale for Children-Revised (WISC-R) are two tests that are often used in the assessment process for special education referrals. Sex differences apparent in these tests were examined in a sample of Arkansas school children who were first-time referrals for a psychological evaluation. The subjects' PPVT-R standard scores, WISC-R IQ scores, and WISC-R subtest scores were divided into groups according to one-year intervals from ages 6 through 16. A separate 2 × 11 (subjects' sex x subjects' age) analysis of variance was performed for each dependent variable. Results indicated significant sex differences among WISC-R Full Scale, Verbal, and Performance IQs and PPVT-R standard scores (p < .01). Several WISC-R subtests also revealed significant sex differences. Further significant sex differences were indicated at several age groups on each dependent variable, with males consistently scoring higher than females on 87%. of the dependent measures excluding the WISC-R subtest Coding, on which females scored higher. Implications concerning the referral process are discussed.     

The relationship between the WISC-R and WRAT-R for a sample of rural referred children

WISC-R Verbal and Performance IQ scores obtained from a sample of 124 referred children were correlated with WRAT-R achievement scores. The Verbal IQ was found to predict Reading, Spelling, and Arithmetic. The Performance IQ did not add significantly to the predictions. The results were consistent with earlier studies that examined the relationship of the WISC-R to the WRAT.     

A survey of the use of newspapers in science instruction by secondary teachers in Northern Ireland

The purpose of this study was to explore the extent and nature of teachers' use of newspapers in the secondary science classroom. A survey was conducted in 50 schools. Through semi-structured interviews with the heads of their science departments, three broad issues were investigated: the prevalence, pattern and purpose of use, classroom practice and curricular priorities. It was found that a great many teachers use newspapers, in some way, to support science instruction. The majority, however, used the resource incidentally rather than systematically. By far their most common intention was to highlight the link between school science and everyday life. Only a few reported that they used newspapers to develop among their students an aptitude and ability to read and respond critically to science in the media. It is suggested that such findings are significant in the context of current discussion of the school curriculum and 'scientific literacy'.     

Examining Effective Intervention Practices for Communication Impairment in Autism Spectrum Disorder

This article describes effective communication-related practices by reviewing specific evidence-based techniques, sharing how these techniques have been used in various treatment approaches, and discussing a constellation of general principles vital to treatment success. A comprehensive model of service delivery is provided to illustrate these key features of effective practice within the ecological and cultural contexts of families and their everyday lives.     

HIGH ASPIRATIONS BUT LOW PROGRESSION: THE SCIENCE ASPIRATIONS�CCAREERS PARADOX AMONGST MINORITY ETHNIC STUDENTS

Students’ interest in studying science and their aspirations to pursue science-related careers is a topic of global concern. In this paper, a set of data gathered for the initial phase of the 5-year study of Science Aspirations and Careers: Age 10–14 (the ASPIRES project) is presented. In the initial phase of this project, a questionnaire exploring students’ aspirations was developed, validated and trialled with nearly 300 primary school students. Principal component analyses and Cronbach’s alpha revealed that the questionnaire was comprised of a number of unidimensional components and that reliability was acceptable. Further multivariate analyses indicated that students’ aspirations in science were most strongly predicted by parental attitudes to science, attitudes towards school science, self-concept in science, images of scientists and engagement in science-related activities outside of school. Moreover, ‘Asian’ students appeared to exhibit a highly positive set of attitudes towards science and aspirations in science, particularly when compared with White students. Reasons for this observed difference are also explored.     

College cheating: Ten years later

In this 10-year follow-up study of student cheating, we surveyed 474 university students to (1) evaluate the extent of cheating; (2) assess attitudes toward cheating; (3) identify variables that discriminate between cheaters and noncheaters; (4) assess the relative effectiveness of various deterrents to cheating; and (5) examine changes in cheating attitudes and behaviors from 1984 to 1994. Most students (61.2%) reported cheating in 1994, up significantly from 54.1% in 1984 (Haines et al., 1986). Despite this increased cheating, students in 1994 were significantly less likely than in 1984 to neutralize (rationalize) their cheating. Ten variables that discriminated between cheaters and noncheaters in 1984 did so again in 1994, and 12 additional discriminating variables were identified. A principal components analysis of these 22 variables indicated that, compared to noncheaters, cheaters are (1) less mature; (2) less reactive to observed cheating; (3) less deterred by social stigma and guilt and more likely to neutralize cheating; (4) less personally invested in their education; and (5) more likely to be receiving scholarships, but doing less well in school. Both cheaters and noncheaters rated embarrassment and fear of punishment as the strongest deterrents to cheating; disapproval of one's friends was ranked as the least effective deterrent by both groups.