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Am J Physiol Cell Physiol (August 1, 2002). doi:10.1152/ajpcell.00242.2002
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Articles in PresS, published online ahead of print August 1, 2002
Am J Physiol Cell Physiol, 10.1152/ajpcell.00242.2002
Submitted on May 24, 2002
Accepted on July 28, 2002

RECOVERY TIME AFFECTS IMMUNO-ENDOCRINE RESPONSES TO A SECOND BOUT OF ENDURANCE EXERCISE

Ola Ronsen1*, Jens Kjeldsen-Kragh2, Egil Haug3, Roald Bahr4, and Bente k Pedersen5

1 Sports Medicine, Norwegian Olympic Sports Center, Oslo, Norway
2 Immunology and Transfusion Medicine, Ullevaal University Hospital, Oslo, Norway
3 Hormone Laboratory, Aker University Hospital, Oslo, Norway
4 Sports Medicine, Norwegian University of Sport and Physical Education, Oslo, Norway
5 Rigshospitalet, Copenhagen Muscle Research Center, Copenhagen, Denmark

* To whom correspondence should be addressed. E-mail: ola.ronsen{at}olympiatoppen.no.

The purpose of this study was to examine the effect of different durations of rest between two bouts of exercise on immuno-endocrine responses during and after the second bout of exercise. Nine endurance athletes participated in three 25 h trials: 1) complete bed rest (REST), 2) two bouts of exercise separated by 3 h of rest (SHORT) 3) two bouts of exercise separated by 6 h of rest (LONG). Each cycle ergometer exercise bout lasted 75 min at 75% of VO2 max. We observed a more pronounced increase in epinephrine, norepinephrine, ACTH and cortisol, but not in GH, and a larger neutrophilia and lymphocytopenia in connection with the second bout of exercise in trial SHORT compared with trial LONG. Lymphocyte activation was unaltered by the difference in rest protocol. In conclusion, a second bout of exercise elicited more pronounced change in neuroendocrine factors and leukocyte counts when preceded by 3 h of rest as opposed to 6h of rest after the first bout of exercise.




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