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Purpose: This study aimed to examine changes in salivary immunoglobulin A (s-IgA) secretion at different intensities or durations of acute exercise.
Methods: Twelve healthy untrained young males were included in randomized crossover trials in Experiment 1 (cycling exercise for 30 min at a work rate equivalent to 35%, 55%, and 75% maximal oxygen uptake [ O]) and Experiment 2 (cycling exercise at 55% O intensity for 30, 60, and 90 min). Saliva samples were collected at baseline, immediately after, and 60 min after each exercise.
Results: Experiment 1: The percentage change in the s-IgA secretion rate in the 75% O trial was significantly lower than that in the 55% O trial immediately after exercise (- 45.7%). The percentage change in the salivary concentration of cortisol, an s-IgA regulating factor, immediately after exercise significantly increased compared to that at baseline in the 75% O trial (+ 107.6%). A significant negative correlation was observed between the percentage changes in saliva flow rate and salivary cortisol concentration (r = - 0.52, P < 0.01). Experiment 2: The percentage change in the s-IgA secretion rate in the 90-min trial was significantly lower than that in the 30-min trial immediately after exercise (-37.0%). However, the percentage change in salivary cortisol concentration remained the same.
Conclusion: Our findings suggest that a reduction in s-IgA secretion is induced by exercise intensity of greater than or equal to 75% O for 30 min or exercise duration of greater than or equal to 90 min at 55% O in healthy untrained young men.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11365859 | PMC |
| http://dx.doi.org/10.1007/s00421-024-05467-6 | DOI Listing |
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