There are no documented adverse effects of breastfeeding after long distance running. This case describes an exclusively breastfed baby who cried after being breastfed about 1--2 hours following his mother's 5-mile run. When artificial baby milk was substituted for the postrun feeding only, the inconsolable crying did not occur. Testing the mother's breast milk before and after running showed a similar level of lactic acid; no other component was tested. Further research is needed in this area.
1. Wallace JP. Infant acceptance of postexercise breast milk. Pediatrics1992; 89:1234-1247.
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2. Dewey KG, Lovelady D, Nommsen-Rivers L, McCrory M, Lonnerdal B.A randomized study of the effects of aerobic exercise by lactating women on breast milk composition. N Engl J Med1994; 330:449-453.
