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Fri, 31 Jan 2003 15:35:32 EST |
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New study reported in the Feb. issue of Pediatrics.
Enjoy!
Kathy
Effect of Exercise on Immunologic Factors in Breast Milk
Objective. Although it is well documented that breast milk provides optimal
nutrition and immune benefits to the infant, factors that influence the
immunologic composition of breast milk are less understood. A recent study
reported that immunoglobulin A (IgA) levels in breast milk are lower after
exercise compared with resting concentrations. However, the women exercised
until exhaustion. The effect of moderate exercise on immunologic components
in breast milk has not been reported. Therefore, the purpose of this study
was to 1) compare the levels of immunologic compounds in breast milk of
exercising women with the milk of sedentary women and 2) determine whether 30
minutes of moderate exercise affects immunologic properties of breast milk.
Methods. Exclusively lactating women were studied at 3 months’ postpartum.
Women in the exercise group (EG; n = 29) reported exercising aerobically at
least 30 minutes/d for 3 days/wk, and women in the sedentary group (SG; n =
24) had exercised once a week or less during the previous 6 weeks.
Cardiovascular fitness levels and concentrations of IgA, lactoferrin, and
lysozyme in milk were measured. A subsample of the EG (n = 17) participated
in a 30-minute exercise session at 75% of maximum heart rate and a rest
session of 30 minutes of sitting rest on 2 separate days. Breast milk samples
were collected before and 10 and 60 minutes after exercise and rest sessions.
IgA, lactoferrin, and lysozyme concentrations were measured.
Results. Women in the EG had a higher level of cardiovascular fitness than
women in the SG (39.7 ± 1.0 vs 32.4 ± 1.0 mL O2/kg/min). Milk concentrations
of IgA, lactoferrin, or lysozyme were not significantly different between
groups. In addition, there were no significant differences in the
concentrations of IgA, lactoferrin, or lysozyme after moderate exercise
compared with sitting rest.
Conclusion. Moderate exercise during lactation improves cardiovascular
fitness without affecting levels of IgA, lactoferrin, or lysozyme in breast
milk.
http://www.pediatrics.org/cgi/content/abstract/111/2/e148?etoc
Kathleen Fallon Pasakarnis, M.Ed. IBCLC
Nurturing Family Lactation and Parenting Services
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