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Studying hair of ancient Peruvians answers questions about stress

Date:
December 12, 2009
Source:
University of Western Ontario
Summary:
A first-of-its-kind archaeological study has detected the stress hormone cortisol in the hair of ancient Peruvians, who lived between 550 and 1532 A.D.

View of the Lost Incan City of Machu Picchu near Cusco, Peru. Recent research has detected the stress hormone cortisol in the hair of ancient Peruvians.
Credit: iStockphoto/Amy Harris

Recent studies show that one in three people suffer from stress and the number is on the rise. But stress isn't a new problem.

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While the physiological state wasn't properly named until the 1930s, new research from The University of Western Ontario proves stress has plagued humans for hundreds, and perhaps thousands of years.

The first study of its kind, published in the Journal of Archaeological Science, detected the stress hormone cortisol in the hair of ancient Peruvians, who lived between 550 and 1532 A.D.

When an individual is stressed -- due to real or perceived threats -- cortisol is released into nearly every part of the body, including blood, saliva, urine and hair.

Emily Webb, a PhD candidate at Western in Archaeological Science and the study's lead author, says the findings are important because it will allow us to better understand how ancient people behaved and felt during their time on Earth but more importantly, to better understand stress and how it affects us today.

"By studying the lives of people using traditional archeological methods like surveying and excavation and combining that with new research techniques like sampling ancient hair specimens, we can get a good picture of what life was like and how our ancestors may have responded to life-changing experiences like illness and disease," explains Webb.

Analysis of cortisol levels in ancient hair allows researchers to assess stress during a short, but critical, period of an individual's life. For this pilot study, the Western researchers selected hair samples from 10 individuals from five different archaeological sites in Peru, and analyzed them in segments to determine cortisol levels.

While many of the individuals studied showed high stress levels right before death, Webb noted that a majority also experienced multiple episodes of stress throughout their final years of their life, again proving that much like today, stress was very much apart of ancient Peruvian's daily lives.

Contributing to the Western research were members of the Faculty of Social Science and the Schulich School of Medicine & Dentistry including Webb, Steven Thomson (Department of Physiology and Pharmacology), Andrew Nelson (Department of Anthropology), Christine White (Department of Anthropology, Canada Research Chair in Bioarchaeology and Isotopic Anthropology), Dr. Gideon Koren (Departments of Physiology and Pharmacology, Medicine, Paediatrics, Ivey Chair in Molecular Toxicology), Dr. Michael Rieder (Departments of Physiology and Pharmacology, Medicine, Pediatrics, Lawson Research Institute, Robarts Research Institute, CIHR-GSK Chair in Paediatric Clinical Pharmacology) and Dr. Stan Van Uum (Department of Medicine and Lawson Research Institute).


Story Source:

The above story is based on materials provided by University of Western Ontario. Note: Materials may be edited for content and length.


Journal Reference:

  1. Emily Webb, Steven Thomson, Andrew Nelson, Christine White, Gideon Koren, Michael Rieder, Stan Van Uum. Assessing individual systemic stress through cortisol analysis of archaeological hair. Journal of Archaeological Science, 2009; DOI: 10.1016/j.jas.2009.11.010

Cite This Page:

University of Western Ontario. "Studying hair of ancient Peruvians answers questions about stress." ScienceDaily. ScienceDaily, 12 December 2009. <www.sciencedaily.com/releases/2009/12/091209114150.htm>.
University of Western Ontario. (2009, December 12). Studying hair of ancient Peruvians answers questions about stress. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2009/12/091209114150.htm
University of Western Ontario. "Studying hair of ancient Peruvians answers questions about stress." ScienceDaily. www.sciencedaily.com/releases/2009/12/091209114150.htm (accessed November 27, 2014).

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