Heart rate variability in chronic and acute stress : with special reference to nocturnal sleep and acute challenges after awakening

摘要: Hynynen, Esa Heart rate variability in chronic and acute stress with special reference to nocturnal sleep challenges after awakening Jyvaskyla: University of Jyvaskyla, 2011, 74 p. (Studies Sport, Physical Education Health, ISSN 0356-1070; 163) ISBN 978-951-39-4207-6 (PDF), 978-951-39-4194-9 (nid.) Finnish summary Diss. The present study was designed investigate the association between forms physical psychological cardiac autonomic modulation real-life situations. results showed that (overtraining) did not affect measured either by hormone secretion or heart (HR) and/or (HRV) indices. HRV immediately an orthostatic test diminished presence stress. Furthermore, overtrained athletes lower cognitive performance responses a task relaxation than control athletes. In contrast stress, produced through endurance exercises found be related decrease HRV. addition, had dose-response relationship. Chronic associated test, but no difference HR, secretions low high groups. Acute HR response during parachute jump further, higher novices experienced jumpers both absolute units relation age-predicted maximum HR. Despite sympathetic activation any indices night tests awakening. Slightly elevated adrenaline preceding jump, it may explained seasonal variation, therefore These indicate can diminish HRV, especially period morning. This phenomenon used estimate stress-induced withdrawal parasympathetic which have negative effects on human health. changes recovery phase from exercises. methods utilized individual follow-ups management athletic training programs.