Study finds new mothers are resistant to stress

November 11, 2003

NEW BRUNSWICK/PISCATAWAY, N.J. -- New mothers are calmer under pressure and deal with adversity better, suggests a new study at Rutgers, The State University of New Jersey.

The study, conducted by Professor Tracey Shors from the department of psychology and the W. M. Keck Center for Collaborative Neuroscience at Rutgers, and graduate student Benedetta Leuner, found that female rats during the postpartum period are less anxious and more resistant to stress than females without offspring. The researchers presented their findings Monday (Nov. 10) at the annual meeting of the Society of Neuroscience in New Orleans, La.

"Our results demonstrated that postpartum female rats show very different and unique responses to stress compared to females without reproductive and maternal experience," Shors says. In virgin rats, exposure to stress severely impaired new learning and increased anxiety. In contrast, stressful events did not affect learning or anxiety behavior in rats with new offspring. The researchers theorize that some cognitive and emotional responses to stressful experiences may be suppressed during the postpartum period.

These findings are the first to show that learning is maintained in new mothers, even in the face of stressful life events. "It is probably good for new mothers to be able to learn effectively regardless of life stressors, especially when it comes to taking care of their young," says Shors. "Our results show that the female response to stressful experience is dynamic and can change dramatically during different stages of reproductive life."

Shors and Leuner believe that these data in rats may relate to mental illness in humans. Women are more susceptible than men to mental disorders associated with stress and stressful life events such as depression, generalized anxiety and posttraumatic stress disorder. By examining the impact of stress on cognitive and emotional function during various stages of reproductive life, such as the postpartum period, scientists may begin to understand the reasons for the high incidence of mental illness in females, especially postpartum depression and psychosis.

In their next studies, the researchers will be addressing the age-old question: Is it nurture or nature? Is the stress response suppressed because of behaviors that occur during motherhood, such as those directly involving nurture and care for their young, or is it mediated by the very different hormonal environment within the postpartum female?

Rutgers University

Related Stress Articles from Brightsurf:

Stress-free gel
Researchers at The University of Tokyo studied a new mechanism of gelation using colloidal particles.

Early life stress is associated with youth-onset depression for some types of stress but not others
Examining the association between eight different types of early life stress (ELS) and youth-onset depression, a study in JAACAP, published by Elsevier, reports that individuals exposed to ELS were more likely to develop a major depressive disorder (MDD) in childhood or adolescence than individuals who had not been exposed to ELS.

Red light for stress
Researchers from the Institute of Industrial Science at The University of Tokyo have created a biphasic luminescent material that changes color when exposed to mechanical stress.

How do our cells respond to stress?
Molecular biologists reverse-engineer a complex cellular structure that is associated with neurodegenerative diseases such as ALS

How stress remodels the brain
Stress restructures the brain by halting the production of crucial ion channel proteins, according to research in mice recently published in JNeurosci.

Why stress doesn't always cause depression
Rats susceptible to anhedonia, a core symptom of depression, possess more serotonin neurons after being exposed to chronic stress, but the effect can be reversed through amygdala activation, according to new research in JNeurosci.

How plants handle stress
Plants get stressed too. Drought or too much salt disrupt their physiology.

Stress in the powerhouse of the cell
University of Freiburg researchers discover a new principle -- how cells protect themselves from mitochondrial defects.

Measuring stress around cells
Tissues and organs in the human body are shaped through forces generated by cells, that push and pull, to ''sculpt'' biological structures.

Cellular stress at the movies
For the first time, biological imaging experts have used a custom fluorescence microscope and a novel antibody tagging tool to watch living cells undergoing stress.

Read More: Stress News and Stress Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to