Two-tiered response of cardiorespiratory-cerebrovascular networks to orthostatic challenge

The authors used this dataset to evaluate the responsiveness of the
cardiorespiratory-cerebrovascular networks by capturing linear and nonlinear
interdependencies to postural changes. Ten young healthy adults participated
in our study between December 2009 and February 2010 at Semmelweis University,
Faculty of Medicine. Non-invasive measurements of arterial blood pressure
(ABP), cardiac cycle duration (derived from ABP signals), breath-to-breath
interval (capnography), cerebral blood flow velocity (BFV, recorded by
transcranial Doppler sonography), and cerebral hemodynamics (hemoglobin
signals monitored by near-infrared spectroscopy) were performed for 30-minutes
in resting state, followed by a one-minute stand-up and a one-minute sit-down
period. BFV and ABP signals were calibrated, and the dataset contains values
in cm/s and mmHg, respectively. NIRS measurement yielded intensity values (raw
signals) from which change of HbO (oxyhemoglobin), HbR (deoxyhemoglobin) and
HbT (total hemoglobin) concentration in tissue can be calculated (in
micromol/liter). Raw NIRS signals were synchronized to BFV, ABP and
capnography time series yielding 33 minutes of resampled data (sampling
frequency: ~ 3 Hz).