Abstract
BACKGROUND: Active commuting is associated with various health benefits, but little is known about its causal relationship with body mass index (BMI).
METHODS: We used cohort data from three consecutive annual waves of the British Household Panel Survey, a longitudinal study of nationally representative households, in 2004/05 (n=15,791), 2005/06 and 2006/07. Participants selected for the analyses (n=4,056) reported their usual main mode of travel to work at each time point. Self-reported height and weight were used to derive BMI at baseline and after two years. Multivariable linear regression analyses were used to assess associations between switching to and from active modes of travel (over one and two years) and change in BMI (over two years) and to assess dose-response relationships.
RESULTS: After adjustment for socioeconomic and health-related covariates, the first analysis (n=3,269) showed that switching from private motor transport to active travel or public transport (n=179) was associated with a significant reduction in BMI compared to continued private motor vehicle use (n=3,090) (-0.32kg/m2, 95% CI: -0.60 to -0.05). Larger adjusted effect sizes were associated with switching to active travel (n=109) (-0.45kg/m2, -0.78 to -0.11), particularly among those who switched within the first year and those with the longest journeys. The second analysis (n=787) showed that switching from active travel or public transport to private motor transport was associated with a significant increase in BMI (0.34kg/m2, 0.05 to 0.64).
CONCLUSION: Interventions to enable commuters to switch from private motor transport to more active modes of travel could contribute to reducing population mean BMI.
METHODS: We used cohort data from three consecutive annual waves of the British Household Panel Survey, a longitudinal study of nationally representative households, in 2004/05 (n=15,791), 2005/06 and 2006/07. Participants selected for the analyses (n=4,056) reported their usual main mode of travel to work at each time point. Self-reported height and weight were used to derive BMI at baseline and after two years. Multivariable linear regression analyses were used to assess associations between switching to and from active modes of travel (over one and two years) and change in BMI (over two years) and to assess dose-response relationships.
RESULTS: After adjustment for socioeconomic and health-related covariates, the first analysis (n=3,269) showed that switching from private motor transport to active travel or public transport (n=179) was associated with a significant reduction in BMI compared to continued private motor vehicle use (n=3,090) (-0.32kg/m2, 95% CI: -0.60 to -0.05). Larger adjusted effect sizes were associated with switching to active travel (n=109) (-0.45kg/m2, -0.78 to -0.11), particularly among those who switched within the first year and those with the longest journeys. The second analysis (n=787) showed that switching from active travel or public transport to private motor transport was associated with a significant increase in BMI (0.34kg/m2, 0.05 to 0.64).
CONCLUSION: Interventions to enable commuters to switch from private motor transport to more active modes of travel could contribute to reducing population mean BMI.
| Original language | English |
|---|---|
| Pages (from-to) | 753-761 |
| Number of pages | 9 |
| Journal | Journal of Epidemiology and Community Health |
| Volume | 69 |
| Issue number | 8 |
| Early online date | 7 May 2015 |
| DOIs | |
| Publication status | Published - Aug 2015 |