Brief Report: Training Load, Salivary Immunoglobulin A, and Illness Incidence in Elite Paratriathletes.
PURPOSE
To gain an exploratory insight into the relation between training load (TL), salivary secretory immunoglobulin A (sIgA), and upper respiratory tract illness (URI) in elite paratriathletes.


METHODS
Seven paratriathletes were recruited. Athletes provided weekly saliva samples for the measurement of sIgA over 23 consecutive weeks (February to July) and a further 11 consecutive weeks (November to January). sIgA was compared to individuals' weekly training duration, external TL, and internal TL, using time spent in predetermined heart-rate zones. Correlations were assessed via regression analyses. URI was quantified via weekly self-report symptom questionnaire.


RESULTS
There was a significant negative relation between athletes' individual weekly training duration and sIgA secretion rate (P = .028), with changes in training duration accounting for 12.7% of the variance (quartiles: 0.2%, 19.2%). There was, however, no significant relation between external or internal TL and sIgA parameters (P ≥ .104). There was no significant difference in sIgA when URI was present or not (101% vs 118% healthy median concentration; P ≥ .225); likewise, there was no difference in sIgA when URI occurred within 2 wk of sampling or not (83% vs 125% healthy median concentration; P ≥ .120).


CONCLUSIONS
Paratriathletes' weekly training duration significantly affects sIgA secretion rate, yet the authors did not find a relation between external or internal TL and sIgA parameters. Furthermore, it was not possible to detect any link between sIgA and URI occurrence, which throws into question the potential of using sIgA as a monitoring tool for early detection of illness.
['Stephenson|Ben T|BT|', 'Hynes|Eleanor|E|', 'Leicht|Christof A|CA|', 'Tolfrey|Keith|K|', 'Goosey-Tolfrey|Victoria L|VL|']
D000328:Adult D005260:Female D006801:Humans D018928:Immunity, Mucosal D007071:Immunoglobulin A, Secretory D008297:Male D064797:Physical Conditioning, Human D012141:Respiratory Tract Infections D012463:Saliva D012636:Secretory Rate D064846:Sports for Persons with Disabilities
monitoring TRIMP disability mucosal immune function triathlon