TY - RPRT TI - Correlation differences in heartbeat fluctuations during rest and exercise. AU - Roman Karasik AU - Nir Sapir AU - Yosef Ashkenazy AU - Plamen Ch Ivanov AU - Itzhak Dvir AU - Peretz Lavie AU - Shlomo Havlin PY - 2002 DO - 10.1103/physreve.66.062902 UR - https://pubmed.ncbi.nlm.nih.gov/12513330/ ID - 12513330 ER -