Caregiving Stress and Exercise: What the Evidence Supports

Informal dementia caregivers often spend their days solving someone else's problems while their own health slips off the schedule. The biology gives that concern some weight: chronic stress can dysregulate the systems that control cortisol, cardiovascular function, metabolism, and immune signaling. Exercise is a plausible countermeasure, but the caregiver-specific trial evidence remains too mixed to promise a particular result.

The practical conclusion is narrower and more useful. If you care for someone with mild cognitive impairment (MCI) or dementia, regular movement is a reasonable part of protecting your own health. Treat it as basic self-care for a high-stress role, not as a proven cure for caregiver burden, depression, or biological aging.

Caregiving can accumulate biological wear

Chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system. Those responses help in an acute emergency. When they stay active, they can contribute to what researchers call allostatic load: cumulative dysregulation across neuroendocrine, cardiovascular, metabolic, and immune systems.

McCrory et al.'s 2023 individual-participant-data meta-analysis describes allostatic load as a multisystem pattern, not a single cortisol test. Sustained cortisol and catecholamine activity, along with inflammatory imbalance, can produce secondary regulatory damage over time. The same framework includes behavior: chronic stress can reduce health-protective activities, including physical activity.

That framework fits caregiving, but it does not quantify how much faster dementia caregivers age biologically than matched non-caregivers. Evidence on stress and epigenetic aging comes largely from other populations. For example, Hamlat et al.'s 2022 study linked early-life adversity with epigenetic age acceleration, while Hinz et al.'s 2025 study found that childhood allostatic load predicted adult cardiometabolic health. These studies support biological plausibility; they do not establish a dementia-caregiver aging rate.

The one caregiver-adjacent epigenetic study here examined grandparent caregiving, not dementia care. Bhat et al. (2026) reported associations between grandparent caregiving and epigenetic-aging markers in U.S. midlife and older adults. Grandchild care and dementia care can differ sharply in duration, intensity, grief, and loss of autonomy, so the result cannot supply a benchmark for dementia caregivers.

What exercise may change

Exercise training has a credible physiological rationale in older adults. Zouhal et al.'s 2022 systematic review found that exercise training could prevent or reverse age-associated catabolic hormonal dysregulation, including elevated cortisol relative to anabolic hormones, compared with sedentary controls. The review did not study people selected for caregiving stress or high allostatic load, so it cannot show that exercise normalizes the HPA axis in dementia caregivers specifically.

Caregivers also do not need a gym-perfect routine before movement becomes worthwhile. Hadgraft et al.'s 2021 systematic review and meta-analyses found that interventions reducing prolonged sedentary time improved cardiometabolic biomarkers in adults. It did not establish a minimum dose for stress resilience, reduce caregiver outcomes to a step count, or test HPA-axis normalization. Still, it supports a practical idea: breaking up long periods of sitting can have measurable physiological value.

For a caregiver, that may mean a walk during a care recipient's appointment, short bouts of resistance work at home, or standing and moving during routine breaks. The evidence does not identify the best modality, dose, or schedule for caregiving stress. A wearable may help with follow-through: Pan et al.'s systematic review and meta-analysis found that wearable activity tracking improved exercise adherence in breast cancer survivors. That is indirect evidence, not proof that a watch will solve the logistical barriers of caregiving.

The caregiver trials are encouraging, but unresolved

The most relevant review is Ahn et al.'s 2025 systematic review and meta-analysis of randomized controlled trials of physical activity among informal caregivers of people with Alzheimer's disease and related dementias or MCI. The authors assessed physical outcomes such as aerobic endurance, balance, and strength; psychological outcomes including anxiety, burden, depressive symptoms, and stress; and wellbeing outcomes such as sleep quality and health-related quality of life. They used Hedges' g and also extracted adherence rates.

That design addresses the right question, but the published information available for this review does not provide its pooled effect estimates across those outcome domains. Readers therefore cannot responsibly be told how large the average benefit was, whether it was statistically significant for each endpoint, or which type of activity worked best.

The uncertainty was already visible in earlier caregiver syntheses described by Ahn and colleagues. One review of four randomized trials found a small reduction in caregiver burden. Another review of three trials found no statistically significant effects on depression, anxiety, burden, or quality of life. Small samples, different exercise protocols, and inconsistent outcome measures can produce divergent pooled results. The contradiction does not mean exercise is futile; it means the caregiver-specific evidence cannot yet support precise promises.

Exercise belongs in a caregiver health plan because it has broad health value and a sound stress-biology rationale. It does not yet have enough caregiver-specific evidence to replace respite, mental-health care, sleep support, or medical care.

Could shared activity help the person receiving care?

A shared routine may be more feasible than trying to carve out separate exercise time, and the care recipient may benefit too. The direct evidence, however, comes from people with cognitive impairment rather than caregiver-care-recipient pairs.

Li et al.'s 2022 meta-analysis included 12 randomized controlled trials of adults older than 60 with MCI and found cognitive benefits from exercise training; resistance training improved executive-function measures with p < 0.05. Aerobic, resistance, and multimodal programs were evaluated, but this evidence does not establish which format a caregiver-and-patient pair should use.

The Phase 3 EXERT trial adds useful detail and an important restraint. In Baker et al.'s 2025 randomized trial, 296 sedentary older adults with amnestic MCI were assigned to 18 months of moderate-high-intensity aerobic training or low-intensity stretching, balance, and range-of-motion training. Supervised-session attendance was high: 81% in the aerobic group and 87% in the stretching/balance group. The primary global cognitive outcome did not differ between groups (regression coefficient -0.078, standard error 0.074; p = 0.3). The trial did report slower Alzheimer's biomarker progression with exercise over the intervention period, but a biomarker result is not the same as demonstrated prevention of dementia or improved day-to-day function.

Reparaz-Escudero et al.'s 2024 review also found benefits of long-term exercise and multidomain interventions for cognition and risk of MCI or dementia in community-dwelling older adults without dementia. Yet the literature remains heterogeneous. Pisani et al.'s 2021 meta-analysis documented conflicting findings and inconsistent effect sizes across physical-activity trials in Alzheimer's disease and MCI. A broader 2022 review by Coley et al. likewise identified important gaps in randomized trials intended to prevent cognitive decline or dementia.

A realistic evidence-based approach

Build movement around the constraints you actually have. Interrupt prolonged sitting when possible. Choose activity that feels safe for your fitness level and care situation. Use simple tracking if it helps you keep appointments with yourself. If shared activity is safe and welcome, a walk, chair routine, or supervised class may offer a practical way to make the plan easier to sustain.

Do not frame exercise as a test of devotion or discipline. Caregiving can narrow a person's time, sleep, and attention; those are conditions, not character flaws. The evidence supports movement as a reasonable health intervention with plausible stress-related benefits. It does not show that exercise reduces caregiver mortality, reverses biological aging, or outperforms respite care, cognitive behavioral therapy, mindfulness, or other supports. The best plan is usually the one that adds movement without pretending it can carry the entire burden.