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Purpose:  The aim of the study was to evaluate the mucosal immune function and circadian variation of salivary cortisol, Immunoglobin-A (sIgA) secretion rate and mood during a period of high-intensity interval training (HIIT) compared to long-slow distance training (LSD).   Methods:  Recreational male runners ( n  = 28) completed nine sessions of either HIIT or LSD within 3 weeks. The HIIT involved 4 × 4 min of running at 90–95% of maximum heart rate interspersed with 3 min of active recovery while the LSD comprised of continuous running at 70–75% of maximum heart rate for 60–80 min. The psycho-immunological stress-response was investigated with a full daily profile of salivary cortisol and immunoglobin-A (sIgA) secretion rate along with the mood state on a baseline day, the first and last day of training and at follow-up 4 days after the last day of training. Before and after the training period, each athlete's running performance and peak oxygen uptake (V · O 2peak ) was determined with an incremental exercise test.   Results:  The HIIT resulted in a longer time-to-exhaustion ( P  = 0.02) and increased V · O 2peak  compared to LSD ( P  = 0.01). The circadian variation of sIgA secretion rate showed highest values in the morning immediately after waking up followed by a decrease throughout the day in both groups ( P  < 0.05). With HIIT, the wake-up response of sIgA secretion rate was higher on the last day of training ( P  < 0.01) as well as the area under the curve (AUC G ) higher on the first and last day of training and follow-up compared to the LSD ( P  = 0.01). Also the AUC G  for the sIgA secretion rate correlated with the increase in V · O 2peak  and running performance. The AUC G  for cortisol remained unaffected on the first and last day of training but increased on the follow-up day with both, HIIT and LSD ( P  < 0.01).   Conclusion:  The increased sIgA secretion rate with the HIIT indicates no compromised mucosal immune function compared to LSD and shows the functional adaptation of the mucosal immune system in response to the increased stress and training load of nine sessions of HIIT.

The Mucosal Immune Function Is Not Compromised during a Period of High-Intensity Interval Training. Is It Time to Reconsider an Old Assumption?