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A new study from the Swedish medical university Karolinska Institutet shows that infants with low concentrations of the stress-related hormone cortisol in their saliva develop fewer allergies than other infants. Hopefully this new knowledge will be useful in future allergy prevention. The study is published in the December paper issue of Journal of Allergy and Clinical Immunology.

Neuroscience researchers from Tufts have demonstrated, for the first time, that the physiological response to stress depends on neurosteroids acting on specific receptors in the brain, and they have been able to block that response in mice. This breakthrough suggests that these critical receptors may be drug therapy targets for control of the stress-response pathway. This finding may pave the way for new approaches to manage a wide range of neurological disorders involving stress.

People with recurrent depression or those exposed to chronic stress exhibits shorter telomeres in white blood cells. This is shown by a research team at Umeå University in a coming issue of Biological Psychiatry. The telomere is the outermost part of the chromosome. With increasing age, telomeres shorten, and studies have shown that oxidative stress and inflammation accelerates this shortening.

A new study by York University researchers finds that practicing yoga reduces the physical and psychological symptoms of chronic pain in women with fibromyalgia. The study is the first to look at the effects of yoga on cortisol levels in women with fibromyalgia. The condition, which predominantly affects women, is characterized by chronic pain and fatigue; common symptoms include muscle stiffness, sleep disturbances, gastrointestinal discomfort, anxiety, and depression.

Acute stress is thought to precipitate alcohol drinking. Yet the ways that acute stress can increase alcohol consumption are unclear. A new study investigated whether different phases of response to an acute stressor can alter the subjective effects of alcohol. Findings indicate bi-directional relationships between alcohol and stress. Results will be published in the October 2011 issue of Alcoholism: Clinical & Experimental Research and are currently available at Early View.

Is your kid a “dove” – cautious and submissive when confronting new environments, or perhaps you have a “hawk” – bold and assertive in unfamiliar settings? These basic temperamental patterns are linked to opposite hormonal responses to stress – differences that may provide children with advantages for navigating threatening environments, researchers report in a study published online July 8, 2011, in Development and Psychopathology.

For women with breast cancer undergoing radiation therapy, yoga offers unique benefits beyond fighting fatigue, according to new research from The University of Texas MD Anderson Cancer Center. While simple stretching exercises improved fatigue, patients who participated in yoga that incorporated yogic breathing, postures, meditation, and relaxation techniques into their treatment plan experienced improved physical functioning, better general health, and lower cortisol (stress hormone) levels. They also were better able to find meaning in their cancer experience.

Children whose mother or father is affected by bipolar disorder may need to keep their stress levels in check. A new international study, led by Concordia University, suggests the stress hormone cortisol is a key player in the mood disorder. The findings published in Psychological Medicine, are the first to show that cortisol is elevated more readily in these children in response to the stressors of normal everyday life.