کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6004258 1184231 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arterial pressure oscillation and muscle sympathetic nerve activity after 20 days of head-down bed rest
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب سلولی و مولکولی
پیش نمایش صفحه اول مقاله
Arterial pressure oscillation and muscle sympathetic nerve activity after 20 days of head-down bed rest
چکیده انگلیسی
Both spectral power within the low-frequency component, i.e., 0.04 to 0.15 Hz, of systolic pressure and muscle sympathetic nerve activity are increased during head-up tilt. The nerve activity during tilt is altered after space flight and exposure to simulated microgravity. In the present study, correlations of the low-frequency component and the nerve activity were analyzed before and after 20 days of − 6° of head-down bed rest. Measurements were performed at − 6° head-down bed rest, 0° (flat), and 30° and 60° head-up tilt (HUT). Mean arterial pressure during HUT was not different between pre- and post-bed rest, but muscle sympathetic nerve activity in post-bed rest significantly increased at tilt angles of − 6°, 0°, 30°, and 60° compared with those during pre-bed rest. The low-frequency component of systolic pressure also significantly increased during post-bed rest compared with pre-bed rest at tilts of 0°, 30°, and 60°. The nerve activity and the frequency component were linearly correlated for individual (r2 = 0.51-0.88) and averaged (r2 = 0.60) values when the values included both pre- and post-bed rest. Thus, the low-frequency component of systolic pressure could be an index of the muscle sympathetic nerve activity during tilt during pre- and post-bed rest.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Autonomic Neuroscience - Volume 177, Issue 2, October 2013, Pages 266-270
نویسندگان
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