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Purpose:  This study aimed to analyze the effects of training load on stress tolerance (ST) and secretory immunoglobulin A (SIgA) in male and female high-intensity functional fitness (HIFF) athletes during two different 10 and consecutive weekly training volume loads [higher (week 1) and lower volume (week 2)].  Methods:  14 athletes [7 males: 29.3 (±5.8) years; 86.3 (±8.2) kg and 176.8 (±3.8) cm and 7 females: 32.7 (±4.4) years; 60.0 (±6.7) kg and 162.5 (±5.9) cm] participated. The ST, assessed by Daily Analysis of Life Demand in Athletes questionnaire (DALDA) and Saliva sampling were performed in four time-points (pre (T1) and post (T2) week 1; pre (T3) and post (T4) week 2).  Results:  Female athletes showed a decrease in ST (symptoms of stress) from 15 T1 to T3 [F (3,36)  = 7.184,  p ˂ 0.001, ηp 2  = 0.374], without difference in male athletes ( p  &gt; .05). There is a significant difference of SIgA concentration [F (3.36)  = 3.551;  p  = .024; ηp 2  = 0.228], with a significant decrease in female athletes group in T2 compared to T1 ( p  = .013) and T4 ( p  = .023). In addition, the different training volume loads did not impact mucosal immunity in male athletes ( p  &gt; .05).  Conclusion:  The current findings suggest that higher HIFF volume results in decreased ST and SIgA concentration in female 20 athletes and a subsequent decrease in training volume loads contributed to restoring these variables.

Effects of Training Loads on Stress Tolerance and Mucosal Immunity in High-Intensity Functional Fitness Athletes