Alterations in autonomic cardiac modulation in response to normobaric hypoxia

Purpose: The present study aimed to determine if autonomic cardiac modulation was influenced by acute exposure to normobaric hypoxia. Method: Ten healthy male lowland dwellers completed five block-randomised single-blinded, crossed-over acute exposures to a normobaric hypoxic environment, each separated by 24 hours’ recovery (20.3%, 17.4%, 14.5%, 12.0% and 9.8% F_IO₂). Supine recordings were made of arterial oxygen saturation and electrocardiogram (ECG). RR intervals from the ECG trace were analysed for time (SDNN, lnrMSSD), frequency (lnVLF, lnLF, lnHF, lnTP, LFnu, and HFnu), and nonlinear (DFA-α1 and SampEn) heart rate variability components. Results: A significant reduction in arterial SaO₂ occurred with reduced F_IO₂, along with a rise in heart rate (Cohen’s d?=?1.16, 95% Confidence Interval [2.64–6.46]), significant at 9.8% F_IO₂. A decrease in autonomic cardiac modulation was also found as shown by a statistically significant (at 9.8% F_IO₂) decrease in lnTP (d?=?1.84 [1.74–1.94]), and SampEn (d?=?0.98 [0.83–1.12]) and an increase in DFA-α₁ (d?=?0.72 [0.60–0.84]) from normoxia at 9.8% F_IO₂. Conclusion: The decrease in variability indicated a reduction in autonomic cardiac modulation. There appears to be a threshold ～9.8% F_IO₂ (～6000?m equiv.), below which significant alterations in autonomic control occur.     

Enhancing Teaching and Learning: Libraries and Open Educational Resources in the Classroom

Academic libraries continually adjust services to adapt to the ever-changing landscape in higher education. In response to the broken textbook market, libraries are becoming actively involved in the open educational resources (OER) movement. Although there is not a formal program in place, librarians at Utah State University explored a collaborative approach to integrate OER in faculty members' courses. One goal of the effort was to work closely with faculty to consider course objectives and learning outcomes when evaluating and incorporating OER. This article identifies a streamlined process for targeting courses most suited for OER adoption and outlines a process of collaborating with teaching faculty to integrate relevant OER. The paper includes a detailed workflow that other libraries can easily adapt to make OER part of their faculty outreach toolkit.     

对成人心血管机能健康评价的探讨

对德州市成人的心血管机能指标：心率、收缩压、舒张压、台阶指数进行分析与评价，结果为下等和差等、研究认为健康意识差、膳食结构不合理、运动习惯差、缺少体育文化氛围是造成现状的重要原因，针对群体状况提出“自我感觉练习法”和几项对策与建议，以指导健身练习。     

论政府职能的服务本质

新一轮行政体制改革的主旨是加强政府的社会管理职能和公共服务职能。其政府职能的本质就是服务,服务精神应成为21世纪政府行政的灵魂。     

批处理过程模拟系统的总体设计及物性推算包的功能

全面介绍了批处理过程模拟系统的总体设计及功能.简要介绍了各个模拟包的主要特点及物性推算包的功能.     

一类随机向量函数序列的依概率收敛性

将依概率收敛的一维随机变量序列的连续函数仍依概率收敛的结论推广到随机向量序列的情形。     

美国高等教育招生制度对我国高招制度改革的启示

美国作为高等教育最发达和最早实现高等教育大众化的国家，在高校招生考试制度如何适应高等教育大众化方面有许多经验可资我们借鉴。当前，我国高校招生考试改革必须在功能上由“选拔”转向“选择”，在内容上应适应大众化教育的要求进一步科学化。     

关于积分问题的一题多解

本文拟从换元法角度对无理函数的不定积分的解题方法作一定探讨。     

功能宗教学发微

文章将宗教归结为一种与世俗秩序并列又与其发生千丝万缕关联的信仰体系。文章在以下几个方面展开:在信众心理层面考察了宗教的源起;解析了宗教对社会结构和信众所具有的多重功能;揭示了宗教在思想和行动两个方面的发展逻辑。     

关于Bloch空间Cesàro算子的一点注记

在对各类解析函数所成的Banach空间上Cesaro算子特征的研究中,我们用具体的例子说明Bloch空间上的Cesaro算子是无界的.