{'fraction_non_alphanumeric': 0.026792750197005517, 'fraction_numerical': 0.015760441292356184, 'mean_word_length': 5.614583333333333, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Nutrition, exercise and the immune system

Today epidemiological evidence exists which supports the anecdotal impression (Nieman & Henson, 1994) that regular exercise increases resistance to infections such as the common cold (Nash, 1987; Fitzgerald, 1988), whereas hard training is associated with increased respiratory infections (Fitzgerald, 1988). It has become clear that the function of the immune system is enhanced by moderate physical activity and may be somewhat responsible for exercise-related reduction in illness. In contrast, it has been repeatedly shown that intense exercise causes inhibition of the function of the immune system in the recovery phase following intense exercise (Hoffman-Goetz & Pedersen, 1994). Today, much research in exercise immunology is stimulated by the acceptance of exercise as a tool to study the immune system. Exercise can be employed as a model for temporary immunosuppression, which occurs after severe physical stress. Furthermore, exercise associated with muscle damage represents a model of the acute-phase response to local injury. Given the fact that nutrition is a critical determinant of immunocompetence, the potential protective role of nutritional agents in exercise-induced immunosuppression will be discussed.