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Epidemiology. 2006 Mar;17(2):222-5.

Physical activity and magnetic field exposure in pregnancy.

Author information

1
Department of Epidemiology School of Public Health, and Carolina Population Center, University of North Carolina, Chapel Hill, USA. david_savitz@unc.edu

Abstract

BACKGROUND:

Peak magnetic field exposure was associated with increased risk of miscarriage in 2 recent studies. Reduced physical activity levels in healthy pregnancies may affect measured exposure and thus bias results.

METHODS:

We recruited 100 pregnant women to wear an Actigraph accelerometer and EMDEX magnetic field monitor for a 7-day period. We evaluated the association between physical activity and magnetic field exposure (peaks and time-weighted average) using generalized estimating equations and linear mixed models.

RESULTS:

We found a positive association between level of activity and likelihood of incurring elevated exposure in the person-day analysis, most strongly for cutpoints of 16 or 20 mG, for both working and nonworking women among whom odds ratios in the uppermost quartile ranged from 2.1 to 2.6. A positive association was found using person-minutes only among nonworking women.

CONCLUSION:

Physical activity may affect peak magnetic field exposure. If the early nausea and later cumbersomeness of healthy pregnancies leads to reduced physical activity, this could distort measured magnetic field-health outcome associations.

[Indexed for MEDLINE]

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