دورية أكاديمية
Acute and persistent effects of a 46-kilometre wilderness trail run at altitude: Cardiovascular autonomic modulation and baroreflexes
| العنوان: | Acute and persistent effects of a 46-kilometre wilderness trail run at altitude: Cardiovascular autonomic modulation and baroreflexes |
|---|---|
| المؤلفون: | Bernardi, Luciano, Passino, Claudio, Robergs, Robert A., Appenzeller, Otto |
| المصدر: | Cardiovascular Research |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 1997 |
| المجموعة: | Queensland University of Technology: QUT ePrints |
| مصطلحات موضوعية: | adrenergic stimulation, adult, aged, altitude, article, autonomic nervous system, breathing rate, cardiovascular function, cholinergic stimulation, controlled study, diastolic blood pressure, exercise, female, heart rate variability, human, human experime, Baroreflex, Blood Pressure, Electrocardiography, Heart, Heart Rate, Humans, Male, Middle Aged, Neck, Physical Endurance, Posture, Running, Signal Processing, Computer-Assisted |
| الوصف: | Objective - To test the hypothesis that prolonged exercise induces long- lasting effects on blood pressure and heart rate we studied 17 endurance runners before and after the 1995 Sandia Wilderness Crossing Research Run (46 km of rocky trails, average altitude 2500 m). Methods - We evaluated the response of the cardiovascular system to sympathetic stimulation by orthostatism and to sympathetic and parasympathetic carotid baroreceptor stimulations by sinusoidal neck suction at different frequencies (sympathetic activity on blood pressure by low-frequency stimulation, parasympathetic activity on RR interval by high-frequency stimulation). We used power spectral analysis of beat-to-beat RR interval, systolic and diastolic non- invasive blood pressure, in order to quantify the respiratory fluctuations (depending on vagal activity on the RR interval) and the slower non- respiratory fluctuations, depending on sympathetic activity on the blood pressure. Recordings were performed 24 h before, and 30 min, 24 h, and 48 h after the run. Results - Thirty minutes after the race we found reduced blood pressure, signs of relative sympathetic predominance (increased RR interval low-frequency/high-frequency ratio from 0.65 ± 0.15 to 1.63 ± 0.37, P < 0.05), reduced effect of parasympathetic baroreceptor stimulation (decrease in RR interval high-frequency neck-suction synchronous oscillations, from 5.33 ± 0.34 to 3.55 ± 0.37 ln-ms2, P < 0.005), unchanged blood pressure responses to sympathetic stimulations; 24 h after the race, the response to parasympathetic stimulation was increased (to 6.44 ± 0.32 ln-ms2, P < 0.0005) compared to baseline (24 h before the race), whereas sympathetic stimulation by neck suction had no longer an effect on blood pressure. Conclusion - The acute effects of prolonged exertion are associated with a relative increase in sympathetic activity. Twenty-four hours after this case an increased sensitivity to vagal and reduced sensitivity to sympathetic baroreflex stimulations was found. In this field ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| العلاقة: | Bernardi, Luciano, Passino, Claudio, Robergs, Robert A., & Appenzeller, Otto (1997) Acute and persistent effects of a 46-kilometre wilderness trail run at altitude: Cardiovascular autonomic modulation and baroreflexes. Cardiovascular Research, 34(2), pp. 273-280.; https://eprints.qut.edu.au/96948Test/; Faculty of Health |
| الإتاحة: | https://doi.org/10.1016/S0008-6363Test(97)00025-4 https://eprints.qut.edu.au/96948Test/ |
| حقوق: | Copyright 1997 European Society of Cardiology ; This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
| رقم الانضمام: | edsbas.A98B35F |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |