Comparison of detrended fluctuation analysis and spectral analysis for heart rate variability in sleep and sleep apneaThomas Penzel, Armin Bunde, Jan W. Kantelhardt et al.|IEEE Transactions on Biomedical Engineering|2003Cited by 489
Agreement of different methods for assessing sleep characteristics: a comparison of two actigraphs, wrist and hip placement, and self-report with polysomnographyMelanie Zinkhan, Andreas Stang, Klaus Berger et al.|Sleep Medicine|2014Cited by 240
Modulations of Heart Rate, ECG, and Cardio-Respiratory Coupling Observed in PolysomnographyThomas Penzel, Christoph Schöbel, Jan W. Kantelhardt et al.|Frontiers in Physiology|2016Cited by 174
Cardiovascular and respiratory dynamics during normal and pathological sleepThomas Penzel, Ingo Fietze, Niels Wessel et al.|Chaos An Interdisciplinary Journal of Nonlinear Science|2007Cited by 69
Cross-Modulated Amplitudes and Frequencies Characterize Interacting Components in Complex SystemsFabian Gans, Ingo Fietze, Aicko Y. Schumann et al.|Physical Review Letters|2009Cited by 43