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. Author manuscript; available in PMC: 2009 Feb 20.
Published in final edited form as: J Gerontol A Biol Sci Med Sci. 2006 Jun;61(6):575–584. doi: 10.1093/gerona/61.6.575

Figure 1.

Figure 1

Interleukin (IL)-6 circadian rhythm. In both young and older persons, the secretion of IL-6 follows a circadian rhythm with two nadirs at about 8.00 and 21.00, and two zeniths at about 19.00 and 5.00.