Does vigorous intermittent lifestyle physical activity have an association with incident cancer among nonexercising adults? JAMAOnc physicalactivity PA cancer intermittent
By Pooja Toshniwal PahariaAug 2 2023Reviewed by Lily Ramsey, LLM In a recent study published in JAMA Oncology, researchers evaluated the relationship between device-monitored, vigorous, intermittent lifestyle physical activity and cancer incidence. They estimated the minimal dosage needed for a 50% risk reduction.
The relationship between the PA intensity and sites of certain cancers, such as colon and breast tumors, depends on the dosage and has greater risk reductions related to VPA compared to lower intensities. The study included 22,398 physically inactive adult participants of the United Kingdom Biobank accelerometry study followed through October 30 2021 or June 30 2021 . The study exposures were regular VILPA of ≤1.0 and 2.0 minutes, measured using accelerometers worn by the participants on their dominant wrist.
The team classified PA intensity using validated two-stage random forest classifiers based on machine learning into light-intensity PA , moderate-intensity PA , and VPA. Cancer incidence was described as tumor registrations and tumor-related hospitalization or mortality, excluding in situ non-melanoma skin tumors and poorly defined tumors.
Over seven years of follow-up , 2,356 new-onset cancer events were reported, of which 1,084 were due to physical activity-associated cancer. Ninety-two percent of vigorous intermittent lifestyle PA resulted from ≤1.0-minute bouts, and 97% of the bouts were ≤2.0-minute-long. In addition, the sensitivity analyses yielded similar results, performed by excluding underweight or poor-health individuals and those who reported an event during the initial two years and excluding body mass index from the modeling.
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