Twenty-eight endurance-trained males aged 31.1 ± 10.2 years (body mass [BM] 81.9 ± 9.0 kg) completed this randomized double-blind placebo (PLA)-controlled crossover study investigating the effect of 12-week Colostrum Bovinum (COL) supplementation (25gCOL·day-1) on aerobic fitness and capacity, time to exhaustion, BM and body composition (BC), and blood lactate concentration. There were four main-before/after supplementation study visits (COLPRE and COLPOST; PLAPRE, and PLAPOST). During study visits, BM and BC evaluation, incremental rowing test (IRT) to exhaustion, and evaluation of resting (REST) and post-exercise (POST-IRT) blood lactate concentration were performed. COL, but not PLA supplementation, significantly increased (p < 0.05) time to ventilatory threshold (TVT). Moreover, the implemented treatments had large (mL·min-1) and moderate (mL·min-1·kg-1) effects on oxygen uptake at VT (VO2VT), as well as moderate effect on power output at VT (PVT; W·kg-1) with the highest values observed at COLPOST visit. Neither significant influence of COL supplementation on time to exhaustion (TEXH) in IRT, BM, and BC on blood lactate was observed. Importantly, there were significantly (p < 0.05) higher increases in VO2VT (mL·min-1 and mL·min-1·kg-1) after COL compared to PLA supplementation. In summary, COL supplementation resulted in a favorable increase in TVT, and tended to improve some of the evaluated threshold indicators, namely VO2VT and PVT in endurance-trained male athletes during IRT. Therefore, COL supplementation may be considered as a support to improve aerobic fitness and capacity in endurance-trained males; however, supplementation strategy must be personalized and properly incorporated into the individual training. TRIAL REGISTRATION: The study protocol was registered at ClinicalTrials.gov (NCT06390670).

• Klíčová slova
• ergogenic support, proteins, supplementation, swimming, triathlon,
• MeSH
• dospělí MeSH
• dvojitá slepá metoda MeSH
• fyzická vytrvalost * MeSH
• klinické křížové studie MeSH
• kolostrum * MeSH
• kyselina mléčná krev   MeSH
• lidé MeSH
• mladý dospělý MeSH
• potravní doplňky * MeSH
• složení těla * MeSH
• spotřeba kyslíku MeSH
• vytrvalostní trénink * MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• kyselina mléčná MeSH

BACKGROUND: Bovine colostrum (COL) is assumed to be one of the strongest natural immune stimulants. Regular ingestion of COL may contribute to improved immune response in athletes exposed to high training loads. METHODS: Twenty-eight endurance-trained males aged 31.1 ± 10.2 years (body mass 81.9 ± 9.0 kg; height 1.82 ± 0.06 m) completed this randomized double-blind placebo(PLA)-controlled crossover study aimed at investigating the effect of 12-week COL supplementation (25gCOL·day-1) on resting (REST), exercise-induced (POST-EX), and short-term post-exercise recovery (REC; 1 h after test exercise) changes in selected saliva and blood immunoglobulins (Ig), white blood cell (WBC) count and differential; as well as blood hematological, nutritional status and muscle damage indices. The protocol assumed 4 study visits - before/after supplementation with COL (COLPRE and COLPOST ) and PLA (PLAPRE and PLAPOST ). During testing sessions, incremental rowing test to exhaustion and swimming-specific performance test were introduced as exercise stimuli. RESULTS: At COLPOST visit the secretory IgA (SIgA) concentration in saliva was significantly higher at POST-EX and REC compared to REST (p<0.05). COL supplementation had no effect on blood IgA, IgE, IgD, IgG, and IgM concentrations. Furthermore, after COL supplementation decrease of hematocrit at REC (p<0.05) was revealed. CONCLUSIONS: 12-week supplementation with 25 gCOL·day-1 in endurance-trained male athletes resulted in a favorable increase in post-exercise concentration of salivary SIgA. COL seems to be a potential stimulator of local immune defense after exercise-induced homeostasis disturbances. Nevertheless, the lack of effect on blood markers indicates the need for further research in the area of mechanisms underlying the effect of the supposed COL immunological capacity.

• Klíčová slova
• ergogenic support, immunity, immunonutrition, proteins, sports nutrition, triathlon,
• MeSH
• biologické markery * MeSH
• dospělí MeSH
• dvojitá slepá metoda MeSH
• fyzická vytrvalost imunologie   MeSH
• imunoglobuliny krev   MeSH
• klinické křížové studie * MeSH
• kolostrum * imunologie   MeSH
• lidé MeSH
• mladý dospělý MeSH
• potravní doplňky * MeSH
• sliny * imunologie   metabolismus   MeSH
• sportovci * MeSH
• zvířata MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• biologické markery * MeSH
• imunoglobuliny MeSH