7 citations
,
April 2022 in “Journal of pharmaceutical and biomedical analysis” This study describes a new method using high-resolution mass spectrometry for analyzing multiple steroids in human scalp hair, with newborn hair showing the highest steroid concentrations among examined age groups.
5 citations
,
April 2022 in “Journal of Chromatography B” The new method can measure sleep-related hormones in hair effectively and could help track long-term sleep patterns.
6 citations
,
February 2022 in “European journal of endocrinology” This study developed a validated method using UPLC-MS/MS to analyze 37 hormones in human hair, enabling broader hormonal profiling for identifying endocrine disorders.
3 citations
,
October 2021 in “Clinica Chimica Acta” This study found that higher levels of dihydrotestosterone in the parietal region of the scalp may correlate with the clinical presentation of androgenetic alopecia.
3 citations
,
June 2021 in “Journal of affective disorders” This study suggests that hair cortisol and cortisone may moderate the relationship between work stress and depressive symptoms in Chinese fishermen, although their mechanisms differ.
4 citations
,
May 2021 in “Molecules” This study suggests that analyzing hair samples with a liquid chromatography-mass spectrometric assay may offer a reliable method to measure average quarterly vitamin D levels, potentially complementing blood tests.
7 citations
,
May 2021 in “General and comparative endocrinology” This study concluded that qiviut cortisol can be used as a measure of HPA axis activity in muskoxen, with hair growth phase and body region affecting cortisol levels.
16 citations
,
January 2021 in “Frontiers in veterinary science” This study found no significant difference in hair cortisol concentrations, a chronic stress indicator, between sows in farrowing crates and those in loose-housing systems.
5 citations
,
January 2021 in “PeerJ” This study observed that high levels of immunoreactive cortisol in the tail hair of captive Asian elephants were often associated with stressful or distinct behavioral events, suggesting its potential for reconstructing their physiological history.
12 citations
,
December 2020 in “Comprehensive psychoneuroendocrinology” This study found that progesterone levels were higher and increased significantly throughout pregnancy, contrasting with stable levels in non-pregnant women.
11 citations
,
September 2020 in “Steroids” This study developed a new method using liquid chromatography-tandem mass spectrometry to measure multiple steroid hormones in hair, requiring significantly fewer strands than previous methods, with high accuracy and precision.
18 citations
,
February 2020 in “Journal of pharmaceutical and biomedical analysis” This study using high-performance liquid chromatography reported that mice with more diverse gut microbiota had higher levels of specific compounds in hair compared to those with less diversity, with stress affecting certain plasma levels.
21 citations
,
January 2020 in “Conservation Physiology” This study found that cortisol concentrations were significantly higher in hair samples with follicles compared to those without, suggesting potential confounding in stress assessments using different hair sampling methods.
22 citations
,
May 2019 in “Animals” In this study, researchers found that high hair cortisol levels, indicating stress in cows, were associated with certain shelter and cow-level conditions such as unclean environments and physical injuries.
44 citations
,
November 2018 in “Journal of applied ecology” This review discusses the use of hair analysis for examining stress and reproduction hormone levels in wildlife and highlights the need for more comprehensive physiological validations across species.
24 citations
,
October 2018 in “Addiction Biology” This study found that alcohol dependence is associated with altered HPA axis functioning, with AD patients showing higher hair cortisol concentrations and reduced ACTH and cortisol levels, irrespective of childhood maltreatment history.
50 citations
,
July 2018 in “Psychoneuroendocrinology” In this study, researchers found that tritiated cortisol was incorporated into the hair of rhesus monkeys primarily as cortisol and cortisone, as well as other metabolites, after systemic administration.
12 citations
,
December 2017 in “Scientific reports” This study reported that pulverizing hair samples significantly improves the precision of testosterone measurement, with higher testosterone concentrations observed in men than in women.
33 citations
,
January 2017 in “Psychoneuroendocrinology” This study of Danish women found no evidence linking hair cortisol concentration to hair dyeing status or the frequency of hair washing.
44 citations
,
February 2016 in “Zoology” This study observed that hair cortisol concentrations in primates are influenced by factors such as age, sex, hair growth rates, and sampling methods, which must be accounted for in research designs.
23 citations
,
January 2016 in “Brazilian Journal of Psychiatry” This study observed that drug-naïve first-episode psychosis patients had higher hair cortisol concentrations than healthy controls, and these concentrations correlated with the severity of psychopathology.
47 citations
,
January 2016 in “MethodsX” This study found that while the reproducibility of hair cortisol measurements in captive chimpanzees was high, the fineness of homogenized hair, sample weight, and extraction time influenced absolute cortisol concentrations.
134 citations
,
March 2015 in “Clinical Endocrinology” This study introduced a validated LC-MS/MS-based method for profiling long-term steroid concentrations in human scalp hair, offering potential applications in endocrinology research.
101 citations
,
January 2014 in “Journal of Visualized Experiments” This study validated a method for measuring cortisol levels in hair, which may serve as a biomarker for chronic stress in both humans and various animals.
107 citations
,
December 2013 in “International Journal of Dermatology” This review summarizes the anatomical and physiological aspects of human hair and its clinical significance, but does not report new research findings.
16 citations
,
March 2013 in “Clinica Chimica Acta” Cortisol and cortisone release from hair increases in steps over time during incubation.
30 citations
,
April 2011 in “Rapid communications in mass spectrometry/RCM. Rapid communications in mass spectrometry” This study found that using hair steroid profiling, dutasteride treatment led to reduced dihydrotestosterone levels and DHT/testosterone ratio in patients with male-pattern baldness.
80 citations
,
January 2011 in “Clinical Chemistry and Laboratory Medicine (CCLM)” This study confirmed that the diffusion of cortisol from blood is a biologically endogenous source of hair cortisol, correlating significantly with salivary cortisol levels in healthy humans.
501 citations
,
October 2008 in “Psychoneuroendocrinology” This study suggests that cortisol measured in human hair can effectively reflect increased production for up to six months, but its retrospective accuracy may be limited due to rapid decline in levels.
567 citations
,
October 2007 in “Clinical and investigative medicine” This study described a new assay for measuring cortisol in hair and found it may serve as a useful biomarker for long-term cortisol exposure, correlating with 24-hour urine cortisol levels in non-obese subjects.
199 citations
,
July 2007 in “General and Comparative Endocrinology” In this study, researchers found a significant positive association between cortisol levels in hair and feces of domestic cats and dogs, suggesting hair cortisol assays could be a viable option for monitoring chronic stress.
224 citations
,
March 2006 in “Seminars in Cutaneous Medicine and Surgery” This article discusses the hair follicle's regenerative cycles and the molecular mechanisms influencing them, emphasizing the need for therapeutic targeting of the "hair cycle clock" to manage hair growth disorders, without reporting new research findings.
12 citations
,
March 2000 in “Clinical Chemistry” This study found that a daily dose of 50 mg DHEA only slightly increased the urinary testosterone/epitestosterone ratio for a short period, without exceeding the IOC's acceptable limit.
