Skip to main content
. 2008 Oct 21;29(7):823–864. doi: 10.1210/er.2008-0005

Figure 1.

Figure 1

Diversity of pulsatility patterns exemplified by six hormone-concentration profiles obtained simultaneously in the same postmenopausal individual. Numerical values (above columns from left to right) are the number of pulses, the amplitude of the nycthemeral cosine rhythm (% of mean concentration), and relative orderliness defined by the ApEn z score (the absolute value denotes the number of standard deviates that observed ApEn is removed from mean ApEn of 1000 randomly shuffled versions of the same series). Thus, the prolactin pattern is highly regular (absolute z = 26), whereas that of FSH is nearly mean random (absolute z = 2.7). Hormone release was monitored by sampling blood every 10 min for 24 h. Cort, Cortisol; Con, concentration; PRL, prolactin. Data provided by Dr. Ferdinand Roelfsema, University of Leiden (Leiden, The Netherlands).