| Title | Postural hemodynamic parameters in older persons have a seasonal dependency : A pilot study. | ||
| Author | Trozic, Irhad; Platzer, Dieter; Fazekas, Franz; Bondarenko, Alexander I; Brix, Bianca; Rossler, Andreas; Goswami, Nandu | ||
| Journal | Z Gerontol Geriatr | Publication Year/Month | 2020-Mar |
| PMID | 30868225 | PMCID | PMC7066096 |
| Affiliation + expend | 1.Gravitational Physiology, Aging and Medicine Research Unit, Physiology Division, Otto Loewi Center of Vascular Biology, Immunity and Inflammation, Medical University of Graz, Neue Stiftingtalstrasse 6, Graz, Austria. | ||
AIMS: It is known that blood pressure regulation differs seasonally. It is unknown, however, how the cardiovascular system in patients with a stroke reacts to postural changes in different seasons. The aim was therefore to investigate how different temperatures in cold and warm seasons influence the reactions of haemodynamic mechanisms as well as heart rate variability during a sit-to-stand test in patients with stroke and a control group. METHODS: Hemodynamic responses were assessed in both groups during a sit-to-stand test (5鈥痬in sitting followed by 5鈥痬in standing) beat to beat within two different seasons. Systolic blood pressure (SBP), diastolic blood pressure (DBP), mean blood pressure (MBP), heart rate (HR), stroke index (SI), cardiac index (CI) and heart rate variability (HRV) were continuously monitored. RESULTS: During the sitting baseline period delta values of DBP (+15.1 [Standard error (SE) 3.75] mmHg, p鈥? 0.05) and MBP (+14.35 [SE 4.18]鈥痬mHg, p鈥? 0.05) were significantly higher in colder months compared to warmer months whereas SI (-3.86 [SE 1.43]鈥痬l/beat/m(2), p鈥? 0.05) and CI (-0.4 [SE 0.11]鈥痩/min/m(2), p鈥? 0.05) were lower in colder months compared to warmer months in non-stroke participants. In patients with stroke during sitting, baseline period delta values of DBP (+19.92 [SE 8.03]鈥痬mHg, p鈥? 0.05) and MBP (+19.29 [SE 8.6]鈥痬mHg, p鈥? 0.05) were significantly higher in colder months compared to warmer months but SI (-5.43 [SE 1.96]鈥痬l/beat/m(2), p鈥? 0.05) was significantly lower in colder months compared to warmer months. After standing, there was a significant decrease in SBP in warmer months (-16.84 [SE 4.38]鈥痬mHg, p鈥? 0.05) and a decrease in DBP in warmer months (-7.8 [SE 2.3]鈥痬mHg, p鈥? 0.05) and colder months (-6.73 [SE 1.5]鈥痬mHg, p鈥? 0.05) in non-stroke participants and a decrease in MBP in warmer months (-12.5 [SE 2.8]鈥痬mHg, p鈥? 0.05) and colder months (-8.93 [SE 1.8]鈥痬mHg, p鈥? 0.05) in non-stroke participants and in warmer months (-14.54 [SE 4.1]鈥痬mHg, p鈥? 0.05) in patients with stroke. CONCLUSION: Elderly with and without stroke respond to orthostatic stress with a greater drop in blood pressure in the warmer seasons.