两个均匀分布区间长度比的区间估计

从均匀分布的密度函数和分布函数出发,根据两个总体的独立性,利用微积分公式给出两个均匀分布区间长度比的估计量及其相关的性质。通过已构造的统计量得出了完善的两均匀分布区间长度比的区间估计。     

总量均衡区问及其长度问题

总量均衡区间是现代市场经济条件下宏观经济运行中总供给与总需求对比波动所形成的一种特殊现象。总量均衡区间的长度是一个十分重要的问题，由总量均衡区间生发的诸多特殊现象与问题，几乎都与总量均衡区间的长度密切相关。可以说，其长度在很大程度上决定了总量均衡区间对宏观经济运行与调控影响的实际强度；同时，其长度也从一特定的角度反映出现实经济运行中的环境条件、管理水平等方面的基本面貌。深入分析总量均衡区间的长度问题，既对深化相关理性认识有所裨益，同时又为改进与完善实际经济管理提供若干新的思路。     

轻度间隔性有氧运动的抗氧化及抗衰老作用研究

研究轻度间隔性有氧运动对衰老小鼠心肌、肝脏的氧化及衰老的影响,表明此种强度运动可明显降低衰老小鼠心肌MDA,提高抗氧化能力,降低脂褐素含量,延缓心肌衰老,而对肝脏则影响不大     

The effect of two different interval-training programmes on physiological and performance indices

The aim of the present study was to compare the effect of an increasing-distance, interval-training programme and a decreasing-distance, interval-training programme, matched for total distance, on aerobic and anaerobic physiological indices. Forty physical education students were randomly assigned to either the increasing- or decreasing-distance, interval-training group (ITG and DTG), and completed two similar relevant sets of tests before and after six weeks of training. One training programme consisted of increasing-distance interval-training (100–200–300–400–500?m) and the other decreasing-distance interval training (500–400–300–200–100?m). While both training programmes led to a significant improvement in VO₂ max (ES?=?0.83–1.25), the improvement in the DTG was significantly greater than in the ITG (14.5?±?3.6 vs. 7.8?±?3.2%, p?<?.05). In addition, while both training programmes led to a significant improvement in all anaerobic indices (ES?=?0.83–1.63), the improvements in peak power (15.7?±?7.8 vs. 8.9?±?4.7), mean power (10.6?±?5.4 vs. 6.8?±?4.4), and fatigue index (18.2?±?10.9 vs. 7.0?±?14.2) were significantly greater in the DTG compared to the ITG (p?<?.05). The main finding of the present study was that beyond the significant positive effects of both training programmes on aerobic and anaerobic fitness, the DTG showed significant superiority over the ITG in improving aerobic and anaerobic performance capabilities. Coaches and athletes should therefore be aware that, in spite of identical total work, an interval-training programme might induce different physiological impacts if the order of intervals is not identical.     

High-intensity interval training programme for obese youth (HIP4YOUTH): A pilot feasibility study

Recently, there has been growing interest in high-intensity interval training (HIT) as a strategy to improve health. In this pilot study, we examined the feasibility of a 4-week low-volume HIT and its effects on cardiorespiratory fitness (CRF), blood pressure (BP) and enjoyment in overweight and obese youth. Twelve adolescents (body mass index (BMI): 34.8 ± 3.9 kg · m^?2, 14.9 ± 1.5 years) participated in 12 sessions of HIT (10 × 60 s cycling bouts eliciting ~90% maximal heart rate, interspersed with 90 s recovery, 30 min/session, 3 sessions/week) over ~4 weeks. All the participants completed the study and exercise attendance averaged 92%. Despite no changes in body weight and total fat, HIT resulted in significant (P < 0.01) increases in CRF (pre: 20.1 versus post: 22.2 ml · kg^?1 · min^?1) and exercise time (pre: 425 versus post: 509 s) during peak oxygen uptake test, and a reduction in resting systolic BP (pre: 115.8 versus post: 107.6 mmHg). The majority of study participants (83%) enjoyed HIT and more than half of the participants (58%) reported that HIT is a more enjoyable form of exercise compared to other types of exercises. Low-volume HIT is a useful strategy to promote exercise participation and improve cardiovascular health in overweight and obese youth.     

间歇性低氧训练对大鼠血清T、C和LH的影响

采用实验法观察间歇性低氧训练对大鼠血清睾酮（T）、皮质醇（C）、T／C比值和黄体生成素（LH）的影响,结果表明：间歇性低氧训练比游泳训练更能促使血清T、T／C比值和血清LH水平的提高,而使C下降更为明显,从而保持高睾酮低皮质醇水平;间歇性低氧训练比游泳训练对大鼠血清激素有更大的影响,暗示其更有利于提高大鼠的运动能力。     

基于因素计点法和IAHP的企业管理类岗位价值评价

系统地阐述了如何提取有效的薪酬要素,构建了企业管理类岗位价值评价递阶层次结构模型;提出了基于因素计点法和区间层次分析法(IAHP)的管理类岗位价值评价方法;用区间数代替传统层次分析法判断矩阵中的点值,合理地解决了薪酬要素两两比较结果的不确定性和模糊性问题,提高了岗位评价结果的可信度;运用实例,展示了基于因素计点法和IAHP的岗位价值评价的具体操作过程。     

武术训练强度和密度的生化分析

文章从武术训练强度和密度方面进行生化分析,认为间歇训练是提高武术运动员专项能力的有效手段和方法,它可造成运动员训练时体内血乳酸的逐步积累,而且有助于提高运动员体内CP的含量,进一步提高无氧代谢能力。在武术运动训练和教学时,应以生化指标为科学依据,根据武术运动供能的特点进行训练,从而提高运动成绩和教学质量。     

血乳酸在自行车训练监控中的应用

依据项目的供能特点，结合实验数据的分析，提出了血乳酸在山地自行车爬坡间歇训练、自行车50公里团体项目的有氧训练、场地自行车的速度耐力训练中的应用方法。     

斜坡间歇训练对高校学生速度耐力的影响

速度耐力是径赛项目中跑取得优异成绩的素质基础。传统的速度耐力训练方法较多地运用平跑间歇训练法，实践证明这样的训练方法对提高速度耐力极其有限。实践研究发现，增加速度力量的上跑斜坡间歇训练更有利于速度耐力的提高。