Aortic stiffening in women starts in late 30s, decades before menopause

The midlife rise in a woman's arterial stiffness is not driven by menopause, according to a major study that shows these cardiovascular changes actually begin in her late 30s—decades before her final period.

The findings, published in the medical journal Hypertension, challenge the long-held medical assumption that falling estrogen levels are the primary cause of blood pressure changes in middle-aged women. Instead, researchers suggest the shift is driven by the physical structure of the female aorta, which contains fewer elastic fibres from birth than that of men.

This structural difference means women's blood vessels age differently and earlier than previously thought, making early monitoring critical.

What the study found

By analysing data from the Framingham Heart Study, researchers tracked 6,760 women and 3,248 men over 14 years. They measured "pulse pressure"—the difference between the top (systolic) and bottom (diastolic) numbers of a blood pressure reading.

In early adulthood, pulse pressure typically declines as the aorta, the body’s largest artery, widens to accommodate blood flow. However, once the aorta stops widening in middle age, its walls begin to stiffen, causing pulse pressure to rise again.

The study revealed that this transition occurs a decade earlier in women than in men. Women’s pulse pressure hit its lowest point and began to rise when they were in their late 30s, compared to their late 40s for men. Crucially, the timing of menopause had no impact on this transition; women who reached menopause early, late, or at the average age of 51 all saw their pulse pressure begin to rise at the same early stage of life.

Why the aorta behaves differently in women

The rapid rise in midlife pulse pressure among women appears to be a consequence of blood vessel anatomy. Women are born with a smaller volume of elastic fibres in the walls of the aorta than men. Once the artery stops expanding in adulthood, this lack of elastic reserve causes the vessel walls to stiffen more quickly.

By the time women reach age 60, their average pulse pressure surpasses that of men, forcing the heart to work harder and increasing the risk of damage to small blood vessels in the brain and kidneys.

The clinical implications

Wide pulse pressure is a known risk factor for heart disease, dementia, and kidney disease, yet it is currently excluded from clinical guidelines for managing high blood pressure.

Gary F. Mitchell, the study's senior author and president of Cardiovascular Engineering, Inc., warned that women are frequently undertreated due to this omission. Doctors often advise women with "borderline" blood pressure—such as 130/70 mmHg—to simply monitor their condition. Yet this reading represents a pulse pressure of 60 mmHg, a critical threshold.

"Women and their doctors should sound the alarm if pulse pressure is higher than 60 mmHg and track it over time to see if pulse pressure is rising," Mitchell said. He added that high blood pressure accompanied by a wide pulse pressure is also less responsive to standard drug treatments, meaning patients may require a more tailored therapeutic approach.

Early intervention is key

While menopause remains a factor that can accelerate vascular ageing during the perimenopausal transition, the study suggests the groundwork is laid much earlier.

Samar R. El Khoudary, a professor of epidemiology at Virginia Commonwealth University who was not involved in the research, emphasised that women must focus on cardiovascular health long before middle age. "We shouldn’t wait until menopause to start thinking about cardiovascular health," El Khoudary said. "By the time a woman reaches her final menstrual period, vascular changes may already have been underway for years."

The researchers noted some limitations to their work. The study was observational, meaning it cannot prove direct cause and effect, and it relied on self-reported menopause dates rather than direct hormone measurements. Additionally, because the study cohort was predominantly of white European descent, further research is required to determine if these structural patterns differ across other racial and ethnic groups.