Database_Validation Rmssd Selftraining UMH

Two different devices that recorded HRV were used for the measurements: a Biopac MP35 3-lead electrocardiogram (Biopac Systems, Goleta, CA, USA) and the new smartphone application (Selftraining UMH (Elche, Spain)). The electrocardiogram was connected to a computer via USB port and the mobile application was linked using Bluetooth to a previously validated HR sensor chest strap (Polar H10, Polar Electro Oy, Kempele, Finland). Four consecutive 6-minute recordings were captured by alternating the supine position with the seated position in a resting state. During the 6-minute period, the first minute was perfomed to stabilize the HRV signal and the last 5 minutes in each position were taken for the subsequent analysis.