6-Month RCT Secondary Analysis Shows 45-Minute Aerobic Sessions Four Times Weekly Improve Executive Function Scores in Postmenopausal Women

The parent trial randomized 93 cognitively healthy women aged 20–67 with below-average fitness to either a progressive aerobic program or a stretching-toning control for six months. Forty-three percent were postmenopausal; the aerobic arm produced dose-dependent gains in planning, working memory, and inhibitory control that were largest among the postmenopausal subgroup and absent in the stretching arm. Cardiorespiratory fitness improvements mediated roughly one-third of the cognitive change, consistent with vascular and metabolic pathways.

Two-thirds of Alzheimer’s cases occur in women, and menopause-related estrogen decline accelerates vascular risk and hippocampal atrophy. The observed executive-function benefit aligns with prior observational data linking midlife cardiorespiratory fitness to later-life cognitive trajectories, yet the current study was not powered for Alzheimer’s incidence and excluded women already experiencing mild cognitive impairment.

Confirmation requires a larger, menopause-stratified phase-3 trial that measures both cognitive composites and MRI biomarkers of white-matter integrity and hippocampal volume at 12–24 months. Such a trial would also need to test whether benefits persist after exercise cessation and whether they differ by APOE genotype.

Evidence quality is moderate: the design was randomized but the cognitive analysis was secondary, the sample modest, and follow-up limited to six months; an adequately powered primary-endpoint RCT with biomarker outcomes is the logical next step.