Exercise Linked To Better Attention And Memory After Breast Cancer

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In a randomized trial of 253 breast cancer survivors, a remotely coached exercise program was linked to greater improvements in attention at six and 12 months than a wellness program. The trial found no significant between-group differences in its primary outcomes, processing speed and self-reported cognition; a companion analysis also reported slower changes in epigenetic aging markers in the exercise group.

A 12-month exercise program was associated with greater improvements in attention among breast cancer survivors than a health and wellness program, according to a randomized clinical trial published Sept. 30 in the Journal of the National Cancer Institute. The study did not find significant differences between the groups in its two primary outcomes, processing speed and self-reported cognition, and a companion analysis reported slower changes in epigenetic aging markers among participants assigned to exercise.

The trial included 253 breast cancer survivors who had completed active treatment, reported low physical activity and experienced cognitive difficulties. Participants were randomly assigned to either a remotely delivered exercise program or a health and wellness program. Both groups had regular contact with a health coach, but only the exercise group received coaching to increase activity.

Participants in the exercise group used fitness trackers and received individualized support to work toward 150 minutes of moderate-to-vigorous physical activity a week. They increased activity more than those in the wellness group. Both groups improved on all cognitive measures, but researchers found no significant between-group difference in processing speed or self-reported cognition, the trial’s two primary outcomes.

The exercise group had greater improvements in attention at six and 12 months. It also showed a greater memory improvement at six months, but that difference was not maintained at 12 months. Researchers found no significant group difference in executive function. The study therefore points to specific cognitive findings, rather than a consistent advantage across all measures.

Attention Gains During Recovery

Cognitive problems after cancer treatment can affect daily activities, including following conversations, remembering information and completing tasks. The report says such difficulties may persist after treatment and can be linked to a combination of factors, including treatment effects, inflammation, hormonal changes, fatigue and stress. The trial’s attention results matter because they suggest that a supported increase in physical activity may help with one aspect of thinking for some survivors.

The finding is not evidence that exercise reverses all cognitive effects of cancer treatment. The two primary outcomes did not differ significantly between groups, and the memory advantage seen at six months was not sustained at one year. The trial offers evidence to inform further research, not a guarantee of benefit for every survivor or a substitute for care tailored to an individual’s health and abilities.

A companion analysis adds a possible biological clue. Among a subset of participants, researchers found that exercise assignment was associated with slower changes in measures of epigenetic age. That association, alongside the attention results, may help researchers investigate how physical activity relates to cognitive health after treatment, though the studies do not establish that changes to these markers caused the cognitive findings.

How the Trial Was Designed

The cognitive and epigenetic aging reports came from the same randomized clinical trial, which was designed to test whether increasing physical activity could improve cognitive health among breast cancer survivors. Random assignment and a comparison group help researchers evaluate whether outcomes differed between the programs, while the health and wellness group’s regular coach contact means the comparison was not simply exercise versus no support.

The companion study examined a random subset of 124 participants who provided blood at the start of the trial and at six- and 12-month follow-ups. Researchers used two epigenetic clocks, which estimate biological age from DNA methylation patterns. These estimates can differ from chronological age, the number of years a person has lived, and are measures of biological markers rather than direct measures of cognitive ability.

At the study’s start, participants in both groups had epigenetic ages averaging about 8.7 years older than their chronological ages. Over the 12-month study, the health and wellness group showed nearly 10 months of change in epigenetic aging markers, compared with about one month in the exercise group. Across both groups, faster epigenetic aging was associated with less improvement in attention and worse self-reported cognition. These results describe associations and do not show that epigenetic aging caused changes in cognition.

“Attention is central to our everyday activities.”

— Sheri Hartman, lead author and professor at UC San Diego

Limits of the Current Findings

The trial does not show a significant exercise-group advantage in its two primary outcomes, and the memory difference at six months was not present at 12 months. The report does not establish whether the attention gains will continue beyond the study period, how large the changes were in practical terms, or whether the results apply to survivors who were already active or did not report cognitive difficulties.

The epigenetic analysis involved a subset of participants, and the relationship between marker changes and cognitive outcomes remains uncertain. Researchers said larger studies are needed to confirm the findings, test whether changes in epigenetic aging contribute directly to cognitive benefits, and clarify how exercise could help sustain attention and memory improvements. The source report does not provide further details on long-term follow-up or the specific cognitive test scores.

Larger Studies to Test Benefits

The researchers called for larger studies to confirm the results and examine who is most likely to benefit, what amount of activity may be useful, and which biological changes might explain any cognitive effects. Further research will also need to test whether the attention findings persist over time and whether the epigenetic markers are part of a causal pathway or simply change alongside other factors.

For now, the report describes a coached program that helped participants increase activity and was associated with particular outcomes in this study population. It does not set a universal exercise prescription for people recovering from breast cancer. Decisions about physical activity during or after cancer treatment should be discussed with a qualified health professional who can account for a person’s circumstances.

Key Questions

What did the exercise study find?

In a randomized trial of 253 breast cancer survivors, the exercise group had greater improvements in attention at six and 12 months than the health and wellness group. The groups did not differ significantly on the primary outcomes of processing speed and self-reported cognition.

Did exercise improve memory?

The exercise group showed a greater improvement in memory at six months. That advantage was not maintained at 12 months, when the memory benefit was the same as in the comparison group.

What was the exercise program?

It was delivered remotely and included fitness trackers and individualized coaching to help participants work toward 150 minutes of moderate-to-vigorous physical activity per week. Participants in the exercise group increased their activity more than those in the wellness group.

What did the companion study say about biological aging?

In a random subset of 124 participants, two epigenetic clocks indicated slower changes in aging markers over 12 months in the exercise group than in the health and wellness group. The study does not establish that those marker changes caused cognitive improvements.

Does this mean exercise will help every breast cancer survivor?

No. The results apply to the survivors studied, who had completed active treatment, reported low activity and experienced cognitive difficulties. Researchers said larger studies are needed to confirm the findings and identify who may benefit. People considering activity after treatment should discuss their situation with a qualified health professional.

Source: rss