Heart rate variability biofeedback (HRV-BF) has been confirmed to increase heart rate variability (HRV) and cardiac outflows by baroreflex in healthy populations and clinical patients. Autogenic training (AT) is common used in the psychological intervention. This study integrates a single-session of HRV-BF and AT into a high-technology mobile application (app), and examines the effects on HRV indices, breathing rates, and subjective relaxation scores. Healthy college students were recruited and assigned to the single-session HRV-BF group or AT group. Participants in the HRV-BF group received HRV-BF combined with paced breathing training, which gradually stepped down their breathing rates from 12, to 8, to 6 breaths/per min; and received feedback of HRV indices from the app. Participants in the AT group received autogenic training and feedback of heart rate from the app. A chest belt Zephyr BioHarness was connected through Bluetooth to a Zenfone5 mobile phone, it collected the signals of interbeat intervals and breathing rates at pre-training, mid-training, and post-training stages. The Kubios HRV software was used to analyze HRV indices. The results reveal higher HRV indices and lower breathing rates during mid-training and post-training in the HRV-BF group compared to the AT group. There were higher high-frequency of HRV at post-training than pre-training in the AT group. Participants of both groups increased their subjective relaxation scores after training. The HRV-BF protocol increased cardiac outflows by baroreflex and decreased breathing rates, and the AT protocol increased high-frequency of HRV. These high-technology wearable devices combined with psychological interventions will apply to various populations in the future.

心率变异性生物反馈 (HRV-BF) 已被证实可通过压力反射增加健康人群和临床患者的心率变异性 (HRV) 和心脏流出量。自生训练（AT）常用于心理干预。本研究将 HRV-BF 和 AT 的单次会话集成到高科技移动应用程序 (app) 中，并检查对 HRV 指数、呼吸频率和主观放松分数的影响。招募健康大学生并分配到单次 HRV-BF 组或 AT 组。HRV-BF组的参与者接受了HRV-BF结合有节奏的呼吸训练，呼吸频率从12次、8次、6次/分钟逐渐降低；并从应用程序收到 HRV 指数的反馈。AT组的参与者从应用程序接受了自体训练和心率反馈。胸带 Zephyr BioHarness 通过蓝牙连接到 Zenfone5 手机，在训练前、训练中和训练后阶段收集心跳间隔和呼吸频率信号。使用 Kubios HRV 软件分析 HRV 指标。结果显示，与 AT 组相比，HRV-BF 组在训练中期和训练后的 HRV 指数更高，呼吸频率更低。训练后的 HRV 频率高于 AT 组的训练前。两组参与者在训练后主观放松得分均有所提高。HRV-BF 协议通过压力反射增加心脏流出量并降低呼吸频率，AT 协议增加 HRV 的高频。