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Adrenocortical Activity (adrenocortical + activity)
Selected AbstractsA Pain Severity,Hypothalamic,Pituitary,Adrenocortical Axis Interaction: The Effects on Pain Pathways,JOURNAL OF APPLIED BIOBEHAVIORAL RESEARCH, Issue 1 2007John P. Garofalo Recent efforts have identified psychosocial and biological factors influencing the pathogenesis of chronic pain. The present study attempted to identify whether these two variables interact and, in turn, represent an underlying mechanism in the transition from acute to chronic pain. Salivary cortisol samples were collected upon waking up and 20 minutes later daily for 2 weeks from acute pain patients. Analyses revealed a direct relationship between pain severity and hypothalamic,pituitary,adrenocortical activity for temporomandibular disorder, and a negative relationship between these variables for low back pain populations. These results highlight the possible interaction between neuroendocrine and psychological factors to increase the risk for chronic pain. [source] Gender- and Age-Related Differences in the Association Between Social Relationship Quality and Trait Levels of Salivary CortisolJOURNAL OF RESEARCH ON ADOLESCENCE, Issue 2 2008Alan Booth The majority of studies linking individual differences in the quality of social relationships and activity of the hypothalamic-pituitary-adrenal (HPA) axis have focused on the early development of attachment between infants and their caregivers. Later in development, during middle childhood and adolescence, the parallel HPA links to age-appropriate social relationships with peers, parents, and siblings remain largely unspecified. This study addressed this knowledge gap. Early morning saliva samples were obtained from 367 children in middle childhood (ages 6,10) and 357 adolescents (M age=11,16 years) on two successive days 1 year apart and assayed for cortisol. Latent state,trait modeling was employed to separate variance in cortisol levels attributable to "stable trait-like" versus "state or situational specific" sources to minimize the high moment-to-moment variation in basal adrenocortical activity. During adolescence but not middle childhood, and for girls but not boys, lower levels of "trait cortisol" were associated with poor quality social relationships. The pattern was robust, extending to the quality of relationships with parents, siblings, and peers. Importantly, the relationship was independent of the rates of internalizing or externalizing problem behavior. We found that isolating the variance in cortisol levels attributable to stable intrinsic sources revealed an interpretable pattern that linked individual differences in basal HPA activity to social relationships during adolescence. Studies are needed to reveal the biosocial mechanisms involved in the establishment of this gender- and age-specific phenomenon and to decipher whether or not individual differences in this hormone-behavior link are adaptive. [source] Validation of enzyme-linked immunosorbent assay for measurement of faecal cortisol in fishAQUACULTURE RESEARCH, Issue 4 2009Samuel J Lupica Abstract Quantification of glucocorticoid (GC) levels in faeces has become an established method for the non-invasive assessment of adrenocortical activity. These hormones are frequently determined in plasma samples as parameters of adrenal activity and response to stress. Because GCs are metabolized and excreted with both intact hormone and their metabolites present in faeces, the concentration of GCs can be measured in excreta. Faecal samples present the advantages of easy collection, no stress to the animal and elimination of the issue of potentially misleading acute GC spikes. The aim of this study was to determine if an enzyme-linked immunosorbent assay (ELISA) for cortisol was appropriate for monitoring adrenocortical activity in faecal casts of fishes. Performance of the cortisol ELISA was validated by comparison to high-performance liquid chromatography, which is an established method for measuring free GCs and GC metabolites in faeces. Parallelism and sample extraction efficiency were compared for the two methods. Pearson's correlation across samples for these methods was 0.996. Results demonstrated that the ELISA was an efficient, sensitive and reliable method for cortisol measurement in faecal extracts, which should permit integration of non-invasive stress monitoring into studies of fish behaviour and physiology. [source] | ||||||||||