Diurnal Variation in Physiological and Immune Responses to Endurance Sport in Highly Trained Runners in a Hot and Humid Environment

Purpose. The purpose of this study was to investigate the physiological and immunological response of highly trained runners to an intense bout of exercise performed at two different times of day, in a hot, humid environment. Methods. Using a crossover randomized design, 13 highly trained runners (r...

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Bibliographic Details
Published in:Oxidative medicine and cellular longevity 2018-01, Vol.2018 (2018), p.1-9
Main Authors: Boukelia, B., Florida-James, Geraint, Gomes, Elisa Couto
Format: Article
Language:English
Subjects:
Adult
Athletes
Blood cell count
Blood Pressure
Body Temperature
Circadian rhythm
Circadian Rhythm - physiology
Cytokines
Exercise intensity
Heart Rate - physiology
Heat
Heat shock proteins
HSP70 Heat-Shock Proteins - blood
Humans
Humidity
Immune response
Immune system
Immunology
Interleukin-6 - blood
Interleukins
Leukocytes - cytology
Leukocytes - immunology
Leukocytes - metabolism
Lung - metabolism
Male
Medicine
Neutrophils - cytology
Neutrophils - immunology
Neutrophils - metabolism
Olympic games
Physiological aspects
Physiology
Proteins
Runners (Sports)
Running
Temperature
Time Factors
Uteroglobin - blood
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Summary:Purpose. The purpose of this study was to investigate the physiological and immunological response of highly trained runners to an intense bout of exercise performed at two different times of day, in a hot, humid environment. Methods. Using a crossover randomized design, 13 highly trained runners (range V̇O2max 64–79 ml·kg−1 min−1) performed a 10 km time trial run in hot (28°C) and humid conditions (70%), at 2 different times of day (09:00 hs and 18:00 hs). Venous blood samples were taken to determine WBCs (white blood cells), IL-6 (interleukin-6), CC16 (club cell protein 16), and HSP70 (heat shock protein-70) concentrations. Upper respiratory tract inflammation was additionally assessed using a nasal lavage procedure. Results. A significant diurnal difference (p
ISSN:1942-0900
1942-0994
DOI:10.1155/2018/3402143