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Aging cell 2020;19, e13117, doi: 72

& Klymchenko, A

2024;318(Pt B):117023

i , Crystal violet staining of different cancer cells from indicated treatment groups (72 h)

In humans, many circadian-regulated rhythms exhibit attenuated amplitude and phase shifts in older age (Figure 2 illustrates schematically some documented changes: rhythms of locomotor activity (rest-activity cycle), core body temperature, hormone secretion (e.g., melatonin at night, cortisol in the morning), SCN neuronal firing rate, and even daily metabolic indicators like plasma glucose all show diminished oscillation amplitudes in older adults compared to younger adults