BACKGROUND: Cancer survivors are at greater risk for cardiovascular-related mortality. Mobile health (mHealth) is an increasingly prevalent strategy for health promotion, but whether it consistently improves cardiorespiratory outcomes after a cancer diagnosis is unknown. We sought to determine the effectiveness of mHealth fitness/physical activity interventions on cardiorespiratory fitness outcomes among cancer patients and survivors. METHODS: Leveraging MEDLINE/PubMed, Scopus, and ClinicalTrials.gov, we identified studies through May 2023. Included studies provided a quantitative evaluation of an mHealth intervention in a primary or secondary capacity on cardiorespiratory fitness (6-minute walk test, VO2max, 3-minute step test, or systolic blood pressure; or any mention of cardiac measure) and were meta-analyzed (using a random effects model) if they were a randomized controlled trial with sufficient quantitative information. Four coders were involved in applying inclusion/exclusion criteria, coding using a standardized data extraction sheet, and assessing study quality, with each study coded by at least two. RESULTS: Of 656 articles, nine (n = 392) met systematic review inclusion criteria (mean age range 19 to 62 years, 71.9% female, 60.9% breast cancer). Interventions included mobile apps (k = 6), smartwatches (k = 2), or a smartwatch plus a supplemental web/mobile/tablet app (k = 1); median duration of mHealth-use was 12 weeks. Seven (n = 341) fit criteria for meta-analysis. mHealth was associated with improved cardiorespiratory fitness (d = 0.33; 95% CI 0.07 to 0.60) compared to a control group. Relationships remained after accounting for lipid-based outcomes (d = 0.30; 95% CI 0.03 to 0.56). There was no evidence for heterogeneity or publication-bias. CONCLUSIONS: mHealth exercise interventions appear to be a viable strategy for improving cardiorespiratory fitness after a cancer diagnosis.

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