1. Dynamic adaptation of cardiac baroreflex sensitivity to prolonged exposure to microgravity: data from a 16-day spaceflight
- Author
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Maurizio Volterrani, Massimo Pagani, F. Iellamo, Gianfranco Parati, Paolo Castiglioni, John M. Karemaker, G. Mancia, M. Di Rienzo, Medical Biology, Di Rienzo, M, Castiglioni, P, Iellamo, F, Volterrani, M, Pagani, M, Mancia, G, Karemaker, J, and Parati, G
- Subjects
Adult ,Male ,medicine.medical_specialty ,Time Factors ,Settore MED/09 - Medicina Interna ,baroreflex, microgravity ,Physiology ,Hemodynamics ,Space Shuttle ,Blood Pressure ,Baroreflex ,Spaceflight ,Cardiovascular System ,law.invention ,law ,Heart Rate ,Physiology (medical) ,Internal medicine ,medicine ,Heart rate variability ,Humans ,Exercise physiology ,Exercise ,Arterial baroreflex ,business.industry ,Weightlessness ,Vagus Nerve ,Middle Aged ,Space Flight ,Adaptation, Physiological ,Surgery ,Blood pressure monitoring ,Blood pressure ,Cardiology ,Respiratory Mechanics ,Female ,business - Abstract
Di Rienzo M, Castiglioni P, Iellamo F, Volterrani M, Pagani M, Mancia G, Karemaker JM, Parati G. Dynamic adaptation of cardiac baroreflex sensitivity to prolonged exposure to microgravity: data from a 16-day spaceflight. J Appl Physiol 105: 1569-1575, 2008. First published August 28, 2008; doi:10.1152/japplphysiol.90625.2008.-This study explored the process of arterial baroreflex adaptation to microgravity, starting from the first day of flight, during the 16-day STS-107 Columbia Space Shuttle mission. Continuous blood pressure (BP), ECG, and respiratory frequency were collected in four astronauts on ground (baseline) and during flight at days 0-1, 6-7, and 12-13, both at rest and during moderate exercise (75 W) on a cycle ergometer. Sensitivity of the baroreflex heart rate control (BRS) was assessed by sequence and spectral alpha methods. Baroreflex effectiveness index (BEI); low-frequency (LF) power and high-frequency (HF) power of systolic BP (SBP), diastolic BP (DBP), and R-R interval (RRI); the RRI LF/HF ratio; and the RRI root mean square of successive differences (RMSSD) index were also estimated. We found that, at rest, BRS increased in early flight phase, compared with baseline (means +/- SE: 18.3 +/- 3.4 vs. 10.4 +/- 1.2 ms/mmHg; P
- Published
- 2008