Predictors of physical activity adoption in a multiple health behavior change intervention with sedentary smokers

Abstract

Background: Smoking and low physical activity (PA) increase disease risk. Multiple health behavior change (MHBC) interventions simultaneously targeting these behaviors have large potential for impact. This study examined factors related to PA adoption in a PA promotion + smoking cessation intervention with high-risk, underserved smokers. Methods: 101 sedentary smokers were randomized to sequential MHBC counseling, or cessation-only counseling. Outcomes: achievement of >7,500 steps/day (7-day pp) by Week 4 quit day (measured by pedometer); mean 7-day pp vigorous intensity Metabolic Equivalent of Tasks (METs, measured by IPAQ). Multivariable models examined theoretically-relevant factors hypothesized to relate to PA adoption (e.g., self-efficacy). Other variables correlating with PA (p<.20) were covariates. Findings: Sample characteristics included 51% male, 77% African American, age = 42.1 + 10.9; BMI = 29.9 + 7.4. Assignment to our MHBC intervention vs. control (OR 5.41, p=.02) and more physically active household members (OR 1.48, p=.09) contributed to daily steps goal achievement. Hyperactivity (B=87.19, p=.05) and BMI (B =-15.80, p=.09) contributed to greater vigorous intensity METs. Discussion: These results will guide improvements in future MHBC PA programming.