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Echocardiographic
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http://dx.doi.org/10.5772/.107420
DOI:
Prognostic Factors in Pulmonary Hypertension

Novel Pathogenesis and Treatments for Cardiovascular Disease
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Prognostic Factors in Pulmonary Hypertension
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Chapter 19
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The Association of Hair Cortisol
and Cardiometabolic Risk Factors
in Car
diovascular Disease
Jennifer C.Van Wyk
Abstract
Hair cortisol is increasingly becoming a reliable measure of long-term cortisol concentration and is thought to be a suitable biomarker for chronic stress. Further, a growing
amount of scientific literature links elevated hair cortisol concentration with well-known
cardiometabolic risk factors such as hypertension, obesity, dyslipidemia, and diabetes.
This has important implications for the prognosis, treatment, and prevention of cardiovascular disease. This review focuses on the association between increased hair cortisol
and stress-related cardiometabolic risk factors for cardiovascular disease. While the
evidence for the relationship between cardiometabolic risk and elevated hair cortisol is
clear and compelling, the data is inconsistent. Further studies are needed to support the
use of hair cortisol as a biomarker of cardiometabolic risk in cardiovascular disease.
Keywords: cardiovascular disease, hair cortisol, cardiometabolic risk, obesity,
hypertension, dyslipidemia, diabetes
. Introduction
Cardiovascular disease (CVD) continues to be the primary cause of morbidity and
mortality worldwide [1]. In 2019, approximately 17.9 million people died from CVDs,
representing 32% of all global deaths [2]. Eighty-five percent of CVD deaths resulted
from heart attack and stroke. These high numbers are especially concerning since
most CVDs are preventable or modifiable by addressing behavioral risk factors, such
as a sedentary lifestyle, unhealthy diet, tobacco use, and harmful use of alcohol [1–3].
Early detection is essential in eradicating or in beginning management of cardiovascular disease with counseling and medications.
Cardiometabolic risk (CMR) refers to the risk factors that increase the likelihood
of experiencing cardiovascular events or developing metabolic disease [4]. Besides
the traditional cardiovascular risk factors (age, gender, family history, hypertension,
diabetes, and smoking), CMR factors include abdominal obesity, insulin resistance,
inflammation, unhealthy eating habits, and a sedentary lifestyle (Figure ). Several
cross-sectional clinical studies have shown a positive association between cortisol
and cardiometabolic risk factors. With stress being an integral part of modern life
that has become a significant health problem [5, 6], the importance of biomarkers that can assist in the treatment of stress-related diseases should only increase.

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Figure 1.
Factors contributing to cardiometabolic risk.
In particular, hair cortisol concentration (HCC) is gaining interest as a promising
biomarker for cardiometabolic risk [7]. However, research investigating the direct
association between HCC and cardiometabolic risk factors is still in its infancy, and
more extensive prospective cohort studies are needed to gain further insight into the
relationship between HCC, CMR, and the development of CVD. Unhealthy lifestyles
such as physical inactivity, smoking, and excessive alcohol use also result in elevated
cortisol levels and are associated with cardiometabolic risk and cardiovascular disease
[4]. However, this review focuses on biological factors linked to high cortisol levels
and stress that are activated through the hypothalamic-pituitary-adrenal (HPA) axis
pathway, including hypertension, obesity, dyslipidemia, and diabetes.
. Laboratory determination of hair cortisol concentration (HCC)
Different laboratories use similar methods to measure HCC with minor variations
in experimental procedures. Usually, the proximal 3cm of hair which represents the
last 3months of cortisol production, is collected [8, 9]. Using the most proximal segments reduces the potential for a ‘wash-out effect’ which relates to a decline in cortisol
levels in distal segments due to ultraviolet radiation and hair care practices [8]. The
hair sample is carefully sectioned into segment lengths that approximate the period
of interest, for example, cut into 1cm fragments, or whole hair samples are used.
Hair grows approximately 1cm per month, so this is a convenient approximation of
changes in HCC each month [9].
The hair is then either finely minced with scissors or pulverized with a ball mill.
The mass of hair used for analysis varies between studies, with a range of 2.5–50mg
for ELISA and 1.25–20mg for LCMS [10]. Next, the samples are incubated in a solvent
such as methanol for a set period to extract the cortisol. The extraction medium is
evaporated to dryness and the extracted cortisol is reconstituted in a solution such
as phosphate-buffered saline or distilled water. HCC is typically measured using
two types of analyses: immunoassays or mass spectrometry [9, 10]. Immunoassays
used for the analysis include enzyme-linked immunosorbent assay (ELISA), immunoassay with chemiluminescence detection (CLIA), and radioimmunoassay (RIA).

The Association of Hair Cortisol and Cardiometabolic Risk Factors in Cardiovascular…
DOI: http://dx.doi.org/10.5772/.108356
Alternatively, liquid chromatography-mass spectrometry (LCMS) is used to deter-
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mine HCC. Typically, the inter- and intra-assay coefficients of variability (cvs) are
reported to indicate variability between measurements using different plates or tests
and between duplicate samples on the same plate, respectively [10].
As the clinical utilization of HCC increases, it is important to establish an inter
national benchmark [8, 9, 11]. Russell etal. conducted a study comparing the cortisol
testing protocols of four leading laboratories, which include four ELISA methods
and two LCMS methods, by analyzing the same hair samples representing the low,
intermediate, and high ranges of hair cortisol concentrations (HCC) [9]. This study
showed significant positive correlations between the four different immunoassay
methods, while the results for the LCMS methods were almost identical. Further, the
study concluded that laboratories using immunoassays could use a correction factor
to convert results into standard LCMS equivalents.
. The role of long-term hair cortisol levels in CVD risk
Stress can be defined as any stimuli that can alter homeostasis and causes physical,
emotional, or psychological strain. It impairs both physical and physiological health
[6], resulting in a higher risk for obesity, type 2 diabetes mellitus, and cardiovascular
diseases [5, 6]. Stress can be the result of psychosocial factors like anxiety, social isolation, and traumatic life events. Although some stress is beneficial and helps the body
cope (e.g., with inflammation), excessive/prolonged stress can be harmful [12–15].
The response to stress is mediated by the “stress hormone” cortisol, which is released
in higher doses under an excessive amount of stress [12]. Cortisol is a lipid-soluble
glucocorticoid hormone that regulates a wide range of basal processes throughout
the body, including metabolism, and immune response, and, most importantly, it
helps the body to respond to stress and to maintain homeostasis. Cortisol does this by
increasing blood sugar through gluconeogenesis, suppressing the immune system,
and increasing the metabolism of fat, glucose, protein, and carbohydrates [13]. The
production of cortisol is housed in the cortex of the adrenal glands and then released
into the bloodstream, which transports it throughout the body [12]. Cortisol is an end
product of the Hypothalamic-Pituitary-Adrenal (HPA) axis; its secretion in response
to biochemical stress may influence health and cognitive events [12, 13].
The hypothalamic-pituitary-adrenal (HPA) axis is a crucial stress response system
in the human body [12]. The primary function of the HPA axis is to maintain homeostasis and facilitate successful adaption to the surrounding environment through an
intricate cascade of hormonal reactions. The stress response initiates when a stressor
triggers the hypothalamus, releasing corticotropin-releasing factor (CRF) and
vasopressin (AVP). These hormones stimulate the production of adrenocorticotropic
hormone (ACTH) from the pituitary gland, eliciting the release of glucocorticoids,
most notably cortisol, from the adrenal glands (Figure ). Chronic stress has been
well-documented as increasing the risk of cardiovascular disease through sustained
exposure to increased levels of endogenous cortisol [6, 13]. The elevation of plasma
cortisol levels is one of the best-studied components of the stress response, and this
hormone is one of the best indicators of acute stress in humans.
Elevated cortisol leads to downregulation of the glucocorticoid receptor and
potently affects lipid and carbohydrate metabolism [6]. Repeated or chronic stress
can result in HPA axis dysfunction and cortisol remaining at high levels [12]. Clinical
and population studies have shown that excessive cortisol levels are associated with

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Figure 2.
The HPA axis response to stress resulting in elevated cortisol, increased cardiometabolic risk (CMR), and
cardiovascular disease (CVD).

The Association of Hair Cortisol and Cardiometabolic Risk Factors in Cardiovascular…
DOI: http://dx.doi.org/10.5772/.108356
developing central adiposity, insulin resistance and hyperglycemia, hypertension, and
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dyslipidemia [14, 15]. Traditionally these studies measured cortisol levels in body fluids, including saliva, blood, and urine [16]. While blood and saliva samples provide a
cortisol measurement of a single timepoint, urine reflects the total exposure to bioactive cortisol over 12 or 24hours. In contrast, hair allows for retrospective assessment
of long-term cortisol concentrations over weeks, months, and even years [11, 17],
potentially providing a better measure of an individual’s long-term exposure to stress.
HCC is increasingly important in establishing and providing significant insight into
cardiovascular disease prognosis, diagnosis, and management [13]. Elevated cortisol
Also, several cross-sectional studies found positive associations of hair cortisol with
adverse cardiometabolic outcomes, including higher systolic blood pressure [18],
diabetes, metabolic syndrome [18], and adiposity [18, 19].
. Association of hair cortisol with cardiometabolic risk factors
. Hypertension
Hypertension is also known as high or raised blood pressure, in which the blood
vessels have persistently raised pressure. A patient is diagnosed with hypertension
when the systolic blood pressure (SBP) is above or equal to 140mm Hg and/or diastolic blood pressure (DBP) is above or equal to 90mm Hg [20]. If left unmanaged,
hypertension can lead to a heart attack, an enlarged heart, and heart failure [21].
Hypertension can also result in kidney failure, blindness, rupture of blood vessels,
and cognitive impairment. Hypertension is a critical public health and clinical condition affecting billions worldwide, including approximately the 2 million Americans
diagnosed annually [22]. Hypertension is one of the most prevalent risk factors for
almost all cardiovascular diseases [23].
Chronic psychosocial stress is believed to increase the risk of hypertension
through sustained exposure to elevated cortisol levels [21]. Cortisol is essential for
maintaining normal blood pressure but, in excess, produces hypertension [24]. In
2002, the Prospective Studies Collaboration published a meta-analysis based on
61 cohort studies showing that the risk of CVD increased steadily with progressively higher levels of baseline SBP and DBP; a 20mm Hg higher level of SBP and
a 10mm Hg higher level of DBP resulted in a 2-fold higher BP-related absolute risk
of CVD [25]. While research exploring an independent association between HCC
and hypertension is still a new research area, several cross-sectional studies found a
positive correlation between hair cortisol and hypertension [18, 21]. Still, the data on
the relationship between blood pressure and hair cortisol level is inconsistent. While
some studies reported a positive association between mean arterial or systolic blood
pressure and HCC, other studies failed to demonstrate a relationship. In addition,
Feller etal. found no association between prevalent hypertension and HCC and a
negative relationship between objectively measured diastolic blood pressure and
HCC. Hypertension prevalence was 2.23 times higher in participants with CVD [21].
. Obesity
Cardiovascular disease (CVD) is one of the primary causes of increased
morbidity and mortality in people with obesity [26, 27]. Obesity is defined as an
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