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Effects of Endurance Training on Endocrine Response to Physical Exercise after 5 Days of Bed Rest in Healthy Male Subjects
Author(s) -
KOŠKA JURAJ,
KŠINANTOVÁ LUCIA,
KVETŇANSKÝ RICHARD,
HAMAR DUŠAN,
MARTINKOVIČ MIROSLAV,
VIGAŠ MILAN
Publication year - 2004
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1296.070
Subject(s) - medicine , endocrinology , bed rest , endocrine system , epinephrine , endurance training , physical exercise , vo2 max , hormone , heart rate , blood pressure
A bstract : The study was designed to evaluate how a bout of endurance training (ET) influences the endocrine response after head‐down bed rest (HDBR). Eleven healthy males completed the study, which consisted of a 6‐wk ET followed by 5 days of −6° head‐down HDBR. Treadmill exercise at 80% of pretraining maximal aerobic capacity (VO 2max ) was performed before and after ET as well as after HDBR. ET increased VO 2max by 13%. The response of norepinephrine was attenuated after ET and exaggerated after HDBR ( P < 0.001 ). The differences in epinephrine responses were not statistically significant. The responses of cortisol and plasma renin activity (PRA) were unchanged after ET and were enhanced after HDBR ( P < 0.001 ). The response of growth hormone after HDBR was reduced ( P < 0.05 ). Only the change in cortisol response was associated with the increment of VO 2max after ET ( r = 0.68 , P < 0.01 ). Endurance training failed to completely prevent changes in endocrine responses seen after HDBR. Improvement of physical fitness was associated with an enhancement of the cortisol response to exercise following the period of bed rest.