Factors affecting ambulatory heart rate in industrial workers†

The influence of several factors on the heart-rate (HR) response to tasks performed during regular work has been evaluated in a study population of 1654 male factory employees in Israel. Each worker was monitored for approximately one hour with an ambulatory electrocardiogram. The percentage change from resting HR decreased with increasing age and, as expected, was lower in sedentary workers than in manual workers. A highly significant negative correlation between the HR response and both systolic and diastolic blood pressure was found in the manual workers only. In further multiple regression analysis, after controlling for age, relative weight, smoking status, resting HR and the presence of abnormalities on the resting ECG, the association persisted for systolic BP only. Among young workers, both smoking and relative body weight were significantly associated with a higher HR response to work. Those with ECG abnormalities had lower HR response than those with normal ECGs, but not significantly so. These findings indicate that for roughly equivalent tasks and levels of resting HR, the HR response to regular work is influenced by several constitutional and behavioural factors. It may therefore be important to consider these factors when assigning workers to tasks involving strenuous effort.     

Physical,mental, emotional,and subjective workload components in train drivers

This study, using 12 train drivers on a high speed track and 11 drivers on a mountain track, tried to differentiate between the physical, emotional, mental, and subjective workload components imposed on the drivers during work. With the simultaneous recording and on-line analysis of heart rate and physical activity, the emotional component in terms of the so-called additional heart rate was separated from the physical component. Mental workload was calculated by the heart rate variability and by shifts in the T-wave amplitude of the ECG. Speed of the train, mode of driving, and stress of the situation were rated by two observers who accompanied the drivers in the cabin. During speeds up to l00km/h as compared to standstills no heart rate changes occurred, but with speeds from l00km/h up to 200 km/h heart rate decreased indicating a monotony effect. However, heart rate variability, and T-wave amplitude indicated higher mental load during driving in most speed categories. Starting the train and coming to a halt showed greater emotional workload as compared to moving. Observer ratings of stress and subjective ratings of stress by the drivers revealed several discrepancies. Discrepancies were also seen between workload as indicated by the physiological parameters, and corresponding stress ratings by the observers or by the drivers.     

物联网在智能心电监护上的应用

提出将物联网与传统心电Holter仪相结合,特点是:(1)利用家庭末梢网络,将心电Holter仪接入Internet;(2)使用心电数据中心为心电Holter仪提供网络存储功能;(3)采用符合HL7标准的消息结构,实现机器对内容的自动处理。物联网在智能心电监护上的应用能够大大提高用户体验和救治效率,有助于医疗技术发展。     

基于示波法充气测量的移动血压Holter系统

结合现代移动通信技术和电子技术,使用示波法血压充气测量开发了移动血压Hoher,能按医生的设置对病人进行动态血压监测,将测量结果存储并即时通过移动通信网络传送给监护中心,供医生分析和诊断．实现了对病人的动态血压监测,适用于在医院外的远程实时血压监测。     

便携式心电仪中模拟电路的设计

为了能将强噪音背景下的低频微弱心电信号无失真的提取出来,论文设计了集心电放大、右驱、滤波、和电平抬升为一体的模拟心电采集模块,并完成了电路的搭建和测试。试验证明本设计基本滤除了工频干扰,基线漂移和其它高频干扰,从而使心电波形的轮廓清晰可见。     

动态心电图机的检定装置

介绍了一种动态心电图机的检定装置。该装置根据Holter导联连接方式设计导联电极开关控制电路,采用金属外壳屏蔽部分外部干扰信号优化输入阻抗测量。实验结果及测量结果不确定度评定表明该装置能够用于Holter的检定,保证Holter计量性能的准确可靠,为病人身体健康提供保障。