略谈信息技术与数学教学的有效整合

数学课堂教学应该努力借助现代信息技术的优势,改变教学内容的呈现方式,为学生的发展提供丰富的教育资源和有效的学习工具,激发学生的学习兴趣,让他们主动投入到数学学习活动中去。针对信息技术与数学课程有效整合,谈谈我的一些见解。     

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.     

Using and writing reviews to inform your practice

Reviews are seen as a way of exploiting existing data or research findings more fully and can offer a summarised insight into the current understanding of the evidence. Library and information science (LIS) workers can use reviews to inform their decision-making and service planning. Although the LIS evidence base continues to grow there will frequently be times when no published reviews are available. In these instances, you may consider undertaking your own review. Different types of review require different approaches and, by deciding from the outset what kind of review yours will be, will inform your methodology. Guidelines on writing reviews for the Health Information and Libraries Journal are presented.     

Modified breastfeeding attrition prediction tool: prenatal and postpartum tests

In earlier studies, the Breastfeeding Attrition Prediction Tool (BAPT) demonstrated predictive validity in the postpartum period. The purpose of this study was to compare the effectiveness of a modified version of the BAPT when given in the last trimester (BAPT1) and following delivery (BAPT2) in predicting breastfeeding attrition among 117 women who planned to breastfeed for at least 8 weeks. Subjects completed the BAPT during a prenatal breastfeeding class and again at delivery, and they received a phone call at 8 weeks to determine breastfeeding status. In this study, neither of the two administrations of the BAPT was predictive of breastfeeding status at 8 weeks. Findings here may differ because subjects in the current study were all committed enough to attend breastfeeding class and, thus, varied less on commitment than women in earlier studies. Significant associations were found with level of education and having a close relative who breastfed. To assist the perinatal educator in identifying women most at risk for early cessation of breastfeeding, the use of three questions regarding level of education, family support, and breastfeeding preparation is suggested.