Postmenopausal women assigned to regular aerobic exercise improved executive function significantly more than those performing stretching and toning, with measurable differences emerging within three months and remaining after six months, researchers found.
By yourNEWS Media Newsroom.
Postmenopausal women who regularly performed aerobic exercise for six months experienced significantly greater improvements in executive function than women assigned to stretching and toning exercises, according to findings from a randomized trial examining whether menopause influences the cognitive effects of physical activity.
The benefit appeared to be specific to executive function — the mental skills involved in focusing, maintaining attention, organizing tasks and managing time. Researchers did not find a comparable menopause-specific effect on memory, attention, language or processing speed.
The study analyzed 93 cognitively healthy women between ages 20 and 67, with 43% of participants classified as postmenopausal. Investigators found significant differences after both three and six months of exercise, suggesting the cognitive changes developed relatively early in the intervention and persisted as participants continued exercising.
Among women assigned to aerobic exercise, postmenopausal participants improved more in executive function than premenopausal participants. Postmenopausal women in the aerobic group also improved more than their postmenopausal counterparts assigned to stretching and toning.
The findings provide evidence that menopausal status could influence how certain aspects of cognition respond to aerobic exercise, although researchers cautioned that the relatively small number of participants means additional studies are needed to confirm the results.
Study Overview
Researchers designed the trial specifically to examine whether a woman’s menopausal status changes the cognitive response to aerobic exercise.
Participants were randomly placed into either an aerobic exercise program or a stretching and toning program. Both groups exercised approximately one hour per session, four days each week, for six months, allowing investigators to compare different forms of physical activity while keeping exercise frequency and duration similar.
The research focused in part on cognitive changes frequently reported around menopause, particularly difficulties involving concentration, attention and focus. Such complaints can occur during the menopausal transition and prompted investigators to examine whether aerobic conditioning might have different cognitive effects before and after menopause.
Exercise has already been associated with maintaining brain health during aging, and earlier research has found healthier brain outcomes among older adults who accumulated at least 52 hours of exercise over approximately six months. The new trial sought to determine whether aerobic exercise produces a particular advantage in postmenopausal women.
Study Design and Methods
Women assigned to aerobic training exercised using treadmills, elliptical machines or stationary bicycles.
Rather than immediately beginning at full training intensity, participants progressively increased the difficulty of their workouts during the first month before reaching their targeted exercise levels.
Women in the comparison group spent the same amount of time exercising and followed the same four-day weekly schedule but performed stretching and toning activities that were not designed to provide an aerobic training effect.
Researchers assessed cognition before exercise training began and repeated testing after three months and again after six months.
The evaluations covered multiple areas of cognitive performance, including executive function, memory, attention, processing speed and language.
Executive function was measured using a combined score derived from two different tasks. One assessed how effectively participants could shift between changing sets of rules. The second examined rule violations as women learned to navigate a maze.
Researchers then analyzed how individual cognitive scores changed throughout the intervention rather than relying solely on a comparison of participants’ final scores.
Key Results
The strongest difference appeared in executive function.
At both the three-month and six-month evaluations, postmenopausal women assigned to aerobic exercise demonstrated significantly greater improvement than postmenopausal participants performing stretching and toning exercises.
Researchers also found that within the aerobic training group, postmenopausal women showed greater executive-function improvement than women who had not yet reached menopause.
The pattern did not extend broadly across the remaining cognitive tests.
Menopausal status was not associated with a differential aerobic-exercise benefit for memory, attention, language or processing speed. The results therefore did not indicate that aerobic training produced a menopause-specific improvement in cognition generally, but instead pointed toward a more narrowly defined effect involving executive function.
The finding adds to existing evidence connecting sustained physical activity with healthier cognitive aging while raising the possibility that women may respond differently to aerobic exercise after menopause.
Potential Explanations
Researchers identified several possible reasons postmenopausal women may have shown a stronger executive-function response.
One relatively straightforward explanation involves participants’ cognitive performance before the exercise program began.
Postmenopausal women entered the study with lower average executive-function scores than premenopausal women. Researchers said that difference could have provided the postmenopausal group with greater opportunity for measurable improvement during the six-month intervention.
Investigators also discussed what is known as the “exercise timing hypothesis,” which proposes that the relationship between exercise and estrogen-related physiological changes could depend partly on when physical activity occurs in relation to menopause.
Menopause is accompanied by major hormonal changes, and researchers have questioned whether those changes could alter the brain’s response to exercise as women age.
The investigators measured estradiol levels as part of the analysis but found no significant relationship between estradiol and the observed cognitive results.
Another possible explanation involves the cardiovascular effects of aerobic activity.
Aerobic training strengthens the cardiovascular system and can increase circulation and oxygen delivery to the brain. Those physiological effects distinguish activities such as brisk walking, cycling and swimming from stretching and toning and could contribute to stronger effects on cognitive processes involved in executive function.
The findings are also consistent with previous research suggesting that greater physical fitness may help counter cognitive decline among postmenopausal women.
The study, however, did not establish precisely which biological mechanism produced the executive-function differences, leaving the explanation for the menopause-specific pattern unresolved.
Recommendations and Conclusion
Participants in the trial exercised approximately four hours each week, exceeding the minimum amount generally recommended in public health guidance.
Current recommendations call for at least 150 minutes of moderate-intensity physical activity per week. The study does not establish that women must complete four hours of weekly aerobic exercise to experience cognitive benefits.
Researchers instead pointed to sustained participation as an important feature of the findings. Differences in executive function were already detectable after three months and remained evident when participants were assessed again at six months.
For women beginning an aerobic exercise routine, experts recommend selecting an activity that is practical and enjoyable enough to perform consistently. Brisk walking, cycling and swimming are among the aerobic activities that can be incorporated into a regular routine, with exercise intensity gradually increased over several weeks.
The trial’s small sample remains an important limitation, and researchers said larger studies are necessary to determine whether the findings can be replicated and to better understand why postmenopausal women appeared to derive a greater executive-function benefit.
The results nevertheless provide additional evidence that regular aerobic activity may support cognitive as well as cardiovascular health as women age, while suggesting that executive function after menopause may be particularly responsive to sustained aerobic exercise.
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