Figure 37
From: Transdisciplinary unifying implications of circadian findings in the 1950s
Coexisting 8-hour and 24-hour patterns in the same circulation. Circaoctohoran endothelin-1 (ET-1) versus circadian cortisol in 7 clinically healthy students. 2 women and 7 men, 22–27 years of age; note that 8-hour component (c) is most significant for ET-1 (P < 0.001) but it is not detected for cortisol (P > 0.4). Only an about 8-hour (circaoctohoran) group rhythm and no circadian variation characterizes the variability of circulating endothelin-1 in clinically healthy medical students in the presence of a circadian rhythm in circulating cortisol [289].