Association of Daily Steps Over Time with Adult Asthma Incidence.

J Allergy Clin Immunol

Department of Medicine, Vanderbilt University Medical Center, 1161 21(st) Avenue South, Nashville, TN 37232, USA. Electronic address:

Published: March 2025

Background: Higher daily step counts is associated with reduced risk of many chronic diseases. Increased physical activity improves asthma outcomes. There are no known prevention strategies for adult incident asthma.

Objective: To determine whether objective physical activity impacts adult asthma incidence.

Methods: Participants in the All of Us Research Program retrospective cohort aged ≥ 18 years with linked personal activity tracker and electronic health record data met inclusion. Asthma was defined as two ICD-9/10 codes and ≥ 1 medication. Participants with an asthma diagnosis date before/within six months of activity monitor initiation were assigned prevalent asthma; participants diagnosed after six months of activity monitoring were assigned incident asthma.

Results: 8,360 participants met inclusion. Median average steps/day were higher among asthma-free participants [7,795 (5,879-9,921, 95% CI), n = 7,700] than participants with prevalent [6,968 (5,036-9,014, 95% CI), n = 450] or incident asthma [6,953 (5,215-8,261), n = 210] (p < 0.0001). Significant time by incident asthma interaction was observed with a greater decline in steps/day over time in the incident asthma cohort (p = 0.018). An inverse relationship was observed between average steps/day and asthma incidence after adjusting for age, sex, race, body mass index, major depressive disorder, sleep apnea, and chronic obstructive lung disease [adjusted hazard ratio 0.93 (0.88-0.98, 95% CI) per 1,000 average daily step increase].

Conclusions: Objectively measured daily steps are lower in adults who develop incident asthma and may represent a modifiable risk factor to reduce asthma incidence. Future studies should objectively monitor physical activity among adults at risk for and with asthma.

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http://dx.doi.org/10.1016/j.jaci.2025.02.033DOI Listing

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