Heart rate variability (HRV) measurements are performed using a tilt-table (TT) to diagnose dysfunctionality in the autonomic nervous system (ANS) and the cardiovascular system. To maintain homeostasis, the ANS adapts to body position changes through alterations in sympathetic and parasympathetic responses that can be quantified by extracting time-domain and frequency-domain parameters from the heart rate signal. When body position is changed from supine to erect, a healthy subject’s response also shows changes in ANS activity. However, TT can be unsafe or uncomfortable for elderly or overweight subjects. Furthermore, it may induce anxiety which alters the HRV measurements. This study proposes an alternative strategy to replace the TT with a zero-gravity chair (ZGC). The statistical analysis between HRV parameters from the TT and the ZGC shows that ZGC can be a feasible alternative to TT. Therefore, ZGC can be used as a more convenient, secure, stable and safer option to the traditional HRV analysis with TT.

中文翻译：

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零重力座椅与倾斜台在心率变异性测量方面的初步比较

心率变异性 (HRV) 测量是使用倾斜台 (TT) 进行的，以诊断自主神经系统 (ANS) 和心血管系统的功能障碍。为了保持体内平衡，ANS 通过交感神经和副交感神经反应的改变来适应身体姿势的变化，这些反应可以通过从心率信号中提取时域和频域参数来量化。当身体姿势从仰卧变为直立时，健康受试者的反应也会显示 ANS 活动的变化。然而，对于年长或超重的受试者来说，TT 可能不安全或不舒服。此外，它可能会引起焦虑，从而改变 HRV 测量值。本研究提出了一种替代策略，用零重力椅 (ZGC) 代替 TT。TT 和 ZGC 的 HRV 参数之间的统计分析表明，ZGC 可以作为 TT 的可行替代方案。因此，ZGC 可以作为传统的 TT 分析 HRV 的一种更方便、更安全、更稳定和更安全的选择。