Mahdiani Shadi, Jeyhani Vala, Peltokangas Mikko, Vehkaoja Antti
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:5948-51. doi: 10.1109/EMBC.2015.7319746.
With the worldwide growth of mobile wireless technologies, healthcare services can be provided at anytime and anywhere. Usage of wearable wireless physiological monitoring system has been extensively increasing during the last decade. These mobile devices can continuously measure e.g. the heart activity and wirelessly transfer the data to the mobile phone of the patient. One of the significant restrictions for these devices is usage of energy, which leads to requiring low sampling rate. This article is presented in order to investigate the lowest adequate sampling frequency of ECG signal, for achieving accurate enough time domain heart rate variability (HRV) parameters. For this purpose the ECG signals originally measured with high 5 kHz sampling rate were down-sampled to simulate the measurement with lower sampling rate. Down-sampling loses information, decreases temporal accuracy, which was then restored by interpolating the signals to their original sampling rates. The HRV parameters obtained from the ECG signals with lower sampling rates were compared. The results represent that even when the sampling rate of ECG signal is equal to 50 Hz, the HRV parameters are almost accurate with a reasonable error.
随着移动无线技术在全球范围内的发展，医疗保健服务可以在任何时间、任何地点提供。在过去十年中，可穿戴无线生理监测系统的使用一直在广泛增加。这些移动设备可以持续测量例如心脏活动，并将数据无线传输到患者的手机。这些设备的一个重大限制是能量使用，这导致需要低采样率。本文旨在研究心电图（ECG）信号的最低适当采样频率，以获得足够准确的时域心率变异性（HRV）参数。为此，将最初以5kHz高采样率测量的ECG信号进行降采样，以模拟较低采样率的测量。降采样会丢失信息，降低时间精度，然后通过将信号插值到其原始采样率来恢复。比较了从较低采样率的ECG信号中获得的HRV参数。结果表明，即使ECG信号的采样率等于50Hz，HRV参数也几乎准确，误差合理。
