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Revista Portuguesa de Ciências do Desporto
Print version ISSN 1645-0523
Abstract
SANTOS, J. A. Rodrigues dos; CANDEIAS, J. and MAGALHAES, M.C.. Immunological and antropometric changes induced by an ultramarathon in kayak: A case study. Rev. Port. Cien. Desp. [online]. 2006, vol.6, n.2, pp.143-153. ISSN 1645-0523.
This study, replicating a former study with the same master paddler, investigated the changes on the immune system, as well as some anthropometric indicators, before, and one, five, and ten days after an ultramarathon in kayak. The blood samples were collected in fasting state, at 9 a.m., at least 12 hours after the last exertion. The number of leukocytes and the number and percent of lymphocytes, monocytes, neutrophils, eosinophils, and basophils were assessed. By flow citometry, the following lymphocytes subsets were identified and assessed: CD3+, CD4+, CD8+, CD16+/CD56+, CD19+, ratio CD4+/CD8+, CD3+aß, CD3+?d, the activation markers (CD25+, CD94+ e HLA-DR), as well as the "naive" (CD45RA+) and "memory" (CD45RO+) cells. The most significant changes after the ultramarathon indicated the decrease of CD4+CD45RA+ (-14.8%), CD94+ (-40%), CD4+/CD8+ ratio (-15.7%) and the increase of CD4+CD25+ (28%), CD8+ (19%), CD8+CD25+ (36%), CD25+ (29%). Total CD25+ cells increase verified after exertion was sustained during the recovery period. The slight depression of the NK cells verified after the ultramarathon, was more pronounced (-13.6%) at the 10th day of recovery. The other cells, at the 10th of recovery, returned or overpassed the basal values. A significant reduction of the body weight was verified supported by the concurrent reduction of the fat mass, what suggest a negative energetic balance during the ultramarathon. The evolution of the immunological indicators during the study indicated good adaptative capacity of the subject to this kind of exertion. The changes induced by the ultramarathon seem be transitory and didnt trigger any upper respiratory tract infection during the time of exertion or recovery days.
Keywords : ultramarathon; canoeing; immune system; CD4+; CD8+; CD16+/CD56+; CD19+; HLA-DR; CD25+; CD94+; CD45RA+; CD45RO+.
