Effect of exercise on milk immunoglobulin A

Medicine and Science in Sports and Exercise
R L GregoryB A King

Abstract

The major immunoglobulin (Ig) in human secretions is IgA. The immune properties of breast milk are well documented; however, the immunological influence of maximal exercise has not been established. The objective of this study was to investigate the role that exercise has on breast milk IgA and IgA subclasses. Breast milk was collected from 17 lactating women (4.6 +/- 2.3 months postpartum) before and after randomized exercise and control periods. The exercise treatment was a maximal graded treadmill test (VO2max = 30.3 +/- 5.7 mL x min-1 x kg-1). Milk was collected at rest, the breasts were emptied, and samples obtained 10, 30, and 60 min following either exercise or 30-min control rest periods. IgA concentrations were established by enzyme-linked immunosorbent assay. The results indicated that samples taken 10 and 30 min after the exercise period had significantly lower (P < or = 0.05) milk IgA concentrations (21.0 +/- 1.8 and 21.8 +/- 1.4 microg x mL-1, respectively) than the corresponding control resting samples (52.8 +/- 3.5 and 79.3 +/- 7.7 microg x mL-1). The exercise samples were similar to the control samples at 60 min (134.0 +/- 24.6 and 116.0 +/- 15.4 microg x mL-1, respectively), indicating that by 1 h, milk IgA pro...Continue Reading

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Citations

Jan 12, 2001·Journal of Human Lactation : Official Journal of International Lactation Consultant Association·M A McCrory
Aug 16, 2002·Obesity Research·Dawnine Enette Larson-Meyer
May 5, 2006·Medicine and Science in Sports and Exercise
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