March 5 (HealthDay News) -- The cardiovascular damage wrought by an unhappy marriage may be greater for women than men, a new study shows.
While both men and women in "strained" unions, those marked by arguing and being angry, were more likely to feel depressed than happier partners, the women in the contentious relationships were more likely to develop high blood pressure, high cholesterol, high blood sugar and other markers of what's known as "metabolic syndrome," said study author Nancy Henry, a doctoral candidate in clinical healthy psychology at the University of Utah.
Metabolic syndrome is known to boost the risk of heart disease, stroke and diabetes.
While many studies have linked poor marriages with poor health, Henry said she believes her is the first to tie in depression as a possible route through which the strain boosts the risk of metabolic syndrome. "The negativity triggers the depression, which is associated with the metabolic syndrome," said Henry. This was found true, she said, only for the women in her study.
For the study, she interviewed 276 couples, median age 54, by questionnaires, asking about positive aspects of marriage quality such as mutual support and sharing, and negative aspects such as arguing, feelings of hostility and disagreeing over important issues such as kids, sex, money and in-laws. She asked about depressive symptoms.
Couples were married, on average, 27.5 years, most in their original marriage.
"For the most part, you could say, these were happily married couples," Henry said. About 20 percent of the men and 12 percent of the women in the study had metabolic syndrome (diagnosed when three of the five risk factors were present).
The men were as likely as the women to become depressed with marital strain, but the link between negativity, depression and metabolic syndrome only applied to women, she said. The depression in women accounted for the metabolic syndrome, she said.
Exactly why isn't known, but Henry speculated that women may take the negativity more to heart and ruminate about it more than men.
Henry can't say specifically how much risk of metabolic syndrome is attributed to the negativity. Earlier research has linked negativity in marriage with an increased risk of heart disease for both men and women.
She was expected to present her findings Thursday at the American Psychosomatic Society annual meeting, in Chicago.
Another researcher in the field called the findings interesting, especially the new focus on depression as a possible mechanism through which the strain influences the metabolic syndrome.
"The study raises the importance of increasing our understanding of how depression influences biological processes that result in metabolic syndrome -- and why these processes might be stronger for women than men," said Debra Umberson, a professor of sociology at the University of Texas at Austin.
The findings, Umberson said, fit in with her research finding a strong effect of marital strain on partners' overall health. But the gender difference finding differs from her research. "Basically, we find that marital strain undermines the health of men and women," she said, adding that perhaps the men in Henry's study had their health influenced in a different way.
More research is needed, Henry said, to figure out how the pieces fit together.
Meanwhile, Umberson said: "Choose your partner carefully. A strained marriage is bad for your health." If it's already strained, she said, focus on reducing conflict.
SOURCES: Nancy Henry, Ph.D., candidate, clinical health psychology, University of Utah, and clinical psychology intern, Salt Lake City VA Healthcare System; Debra Umberson, Ph.D., professor, sociology, University of Texas at Austin; March 5, 2009, presentation, American Psychosomatic Society annual meeting, Chicago