TY - GEN
T1 - Statistical properties and memory of excursions in heartbeat intervals
AU - Ramírez, Israel Reyes
AU - Vargas, Lev Guzmán
AU - Pérez, Ricardo Hernández
PY - 2010
Y1 - 2010
N2 - We study the statistics of excursions, defined as the number of beats to return to a local mean value in heartbeat interval time series from healthy subjects and patients with congestive heart failure (CHF). We find that the cumulative distributions of excursions (of size τ) are consistent with a stretched exponential function of the form G(τ) ∼ e aτb with a and b constants. Also, we study the statistics of return intervals between long excursions above certain threshold q for both groups to explore the possibility of memory in the time organization of the extreme-size excursions. The correlation method applied to the return intervals shows a weak correlation for both groups with changes as the threshold q increases. The DFA analysis confirms the presence of correlations with scaling exponents higher than the uncorrelated value (α = 0.5).
AB - We study the statistics of excursions, defined as the number of beats to return to a local mean value in heartbeat interval time series from healthy subjects and patients with congestive heart failure (CHF). We find that the cumulative distributions of excursions (of size τ) are consistent with a stretched exponential function of the form G(τ) ∼ e aτb with a and b constants. Also, we study the statistics of return intervals between long excursions above certain threshold q for both groups to explore the possibility of memory in the time organization of the extreme-size excursions. The correlation method applied to the return intervals shows a weak correlation for both groups with changes as the threshold q increases. The DFA analysis confirms the presence of correlations with scaling exponents higher than the uncorrelated value (α = 0.5).
UR - http://www.scopus.com/inward/record.url?scp=79953812058&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:79953812058
SN - 9781424473182
T3 - Computing in Cardiology
SP - 963
EP - 966
BT - Computing in Cardiology 2010, CinC 2010
T2 - Computing in Cardiology 2010, CinC 2010
Y2 - 26 September 2010 through 29 September 2010
ER -