Diane,
  I have a few articles from Dewey's group in Davis, CA on exercise and BF.
One that found that aerobic exercise had no effect on milk composition and
volume:

Dewey, et al. 1994. New Eng J Med 330(7):449-53.

One that found a tendency for exercising women to have higher milk volume
and energy output:

Lovelady, et al. 1990. American Journal of Clinical Nutr. 52:103-9.

I think that others who have found decreased infant acceptance of
post-exercise milk have looked at moms exercising anaerobically (where more
lactic acid is produced). Aerobic, moderate-intensity exercise seems to be
okay (and maybe beneficial). Good Luck! Let me know what else you find!







Julie A. Schneider Hilson
107 Savage Hall
Division of Nutritional Sciences,
Cornell University
Ithaca, NY 14850