49 citations
,
April 2016 in “International journal of molecular sciences” Shift nurses show altered body temperature and stress hormone levels, suggesting their body clocks adjust to irregular schedules.
116 citations
,
May 2013 in “Proceedings of the National Academy of Sciences of the United States of America” Hair grows faster in the morning and is more vulnerable to damage from radiation due to the internal clock in hair follicle cells.
38 citations
,
August 2012 in “Biochemical and biophysical research communications” Human leukocytes and beard hair follicle cells have internal daily clocks, and PER1 and PER3 genes may indicate individual circadian rhythms.
15 citations
,
October 2012 in “Journal of circadian rhythms” RNA from horse hair follicles can track circadian rhythms non-invasively.
12 citations
,
January 2019 in “Sleep medicine” Night shift work disrupts the body's natural clock genes.