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SHR Neuro Cancer Cardio Lipid Metab Microb

Goswami, N; Lackner, HK; Papousek, I; Jezova, D; Montani, JP; Hinghofer-Szalkay, HG.
Interaction of mental and orthostatic stressors
ACTA ASTRONAUT. 2011; 68(9-10): 1509-1516. Doi: 10.1016/j.actaastro.2009.12.007
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Leading authors Med Uni Graz: Goswami Nandu
Co-authors Med Uni Graz: Hinghofer-Szalkay Helmut; Lackner Helmut Karl
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Abstract:: We assessed hemodynamic responses induced by orthostatic and mental stressors, using passive head up tilt (HUT) and mental arithmetic (MA), respectively. The 15 healthy males underwent three protocols: (1) HUT alone, (2) MA in supine position and (3) MA+HUT, with sessions randomized and >= 2 weeks apart. In relation to baseline, HUT increased heart rate (HR) (+20.4 +/- 7.1 bpm; p < 0.001), mean blood pressure (MBP) (+4.7 +/- 11.3 mmHg; p < 0.05), diastolic blood pressure (DBP) (+6.1 +/- 11.6 mmHg; p < 0.05) and total peripheral resistance (TPR) (+155 +/- 232 dyne*s/cm(5); p < 0.001) but decreased stroke volume (SV) (-33.1 +/- 13.4 ml; p < 0.001) and cardiac output (CO) (-0.6 +/- 1.0l/min; p < 0.01). MA increased HR (+8.0 +/- 6.0 bpm; p < 0.001), systolic blood pressure (SBP) (+9.0 +/- 7.7 mmHg; p < 0.001), MBP (+10.0 +/- 6.5 mmHg; p < 0.001), DBP (+9.5 +/- 7.2 mmHg; p < 0.001) and CO (+0.6 +/- 0.8l/min; p < 0.01). MA+HUT increased HR (+28.8 +/- 8.4 bpm; p < 0.001), SBP (+4.6 +/- 14.3 mmHg; p < 0.05), MBP (+11.2 +/- 11.6 mmHg; p < 0.001), DBP (+13.5 +/- 10.1 mmHg; p < 0.001) and TPR (+160 +/- 199 dyne*s/cm(5); p < 0.001) but SV (-34.5 +/- 14.6 ml; p < 0.001) decreased. Mental challenge during orthostatic challenge elicited greater increases in heart rate, despite similar reductions in stroke volume such as those during orthostatic stress alone. Overall, cardiac output decreases were less with combinations of mental and orthostatic challenges in comparison to orthostasis alone. This would suggest that carefully chosen mental stressors might affect orthostatic responses of people on standing up. Therefore, additional mental loading could be a useful countermeasure to alleviate the orthostatic responses of persons, particularly in those with histories of dizziness on standing up or on return to earth from the spaceflight environment of microgravity. (C) 2009 Elsevier Ltd. All rights reserved.
Find related publications in this database (Keywords): Additivity; Blood pressure; Cardiovascular reactivity; Heart rate; Hut; Mental arithmetic