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01.04.2003 | Review Article

Overtraining, Excessive Exercise, and Altered Immunity

Is This a T Helper-1 Versus T Helper-2 Lymphocyte Response?

verfasst von: Lucille Lakier Smith

Erschienen in: Sports Medicine | Ausgabe 5/2003

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Abstract

Overtraining syndrome (OTS) occurs where an athlete is training vigorously, yet performance deteriorates. One sign of OTS is suppressed immune function, with an increased incidence of upper respiratory tract infection (URTI). An increased incidence of URTIs is also associated with high volume/intensity training, as well as with excessive exercise (EE), such as a marathon, manifesting between 3–72 hours post-race. Presently, there is no encompassing theory to explain EE and altered immune competence. Recently, it has been conclusively established that T helper lymphocytes (T_H), a crucial aspect of immune function, represent two distinct functional subsets: T_H1 and T_H2 lymphocytes. T_H1 lymphocytes are associated with cell-mediated immunity (CMI) and the killing of intracellular pathogens, while T_H2 lymphocytes are associated with humoral immunity and antibody production. When T_H-precursor cells are activated, the balance is tipped in favour of one or the other. Furthermore, the most appropriate means of determining the T_H-subset, is by the prevailing cytokine ‘pattern’. This paper hypothesises that exercise-related immunosuppression is due to tissue trauma sustained during intense exercise, producing cytokines, which drive the development of a T_H2 lymphocyte profile. A T_H2 cell response results in simultaneous suppression of CMI, rendering the athlete susceptible to infection. Additionally, increased levels of circulating stress hormones (cortisol and catecholamines), as well as prostaglandin E₂, support up-regulation of T_H2 lymphocytes. Marathon-related data are presented to support this hypothesis. It is concluded that an increased incidence of illness associated with OTS and in response to EE is not due to immunosuppression per se, but rather to an altered focus of immune function, with an up-regulation of humoral immunity and suppression of CMI.

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Titel: Overtraining, Excessive Exercise, and Altered Immunity
Is This a T Helper-1 Versus T Helper-2 Lymphocyte Response?
verfasst von: Lucille Lakier Smith
Publikationsdatum: 01.04.2003
Verlag: Springer International Publishing
Erschienen in: Sports Medicine / Ausgabe 5/2003
Print ISSN: 0112-1642
Elektronische ISSN: 1179-2035
DOI: https://doi.org/10.2165/00007256-200333050-00002

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Overtraining, Excessive Exercise, and Altered Immunity

Is This a T Helper-1 Versus T Helper-2 Lymphocyte Response?

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