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Thermoregulatory and cardiovascular responses in the elderly towards a broad range of gradual air temperature changes
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| Title: | Thermoregulatory and cardiovascular responses in the elderly towards a broad range of gradual air temperature changes |
| Authors: | Tochihara, Yutaka Browse this author | | Yamashita, Kazuaki Browse this author | | Fujii, Kenji Browse this author | | Kaji, Yumi Browse this author | | Wakabayashi, Hitoshi Browse this author | | Kitahara, Hiroyuki Browse this author |
| Keywords: | Elderly | | Ambient temperature change | | Blood pressure | | Cutaneous vascular conductance | | Rectal temperature | | Skin temperature |
| Issue Date: | Jul-2021 |
| Publisher: | Elsevier |
| Journal Title: | Journal of thermal biology |
| Volume: | 99 |
| Start Page: | 103007 |
| Publisher DOI: | 10.1016/j.jtherbio.2021.103007 |
| Abstract: | This study aimed to determine age-related differences in thermoregulatory and cardiovascular responses to a wide range of gradual ambient temperature (T-a) changes. Morphologically matched normotensive elderly and young males participated. The participants wearing only shorts rested during the 3-h experiment. After 30 min of baseline at 28 degrees C, T-a increased linearly to 43 degrees C in 30 min (warming) and then gradually decreased to 13 degrees C in 60 min (cooling). T-a was rewarmed to 28 degrees C in 30 min (rewarming), and that temperature was maintained for an additional 30 min (second baseline). During the warming phase, there were no age-related differences in blood pressure (BP) and rectal temperature (T-re), despite a significantly lower cutaneous vascular conductance and heart rate in the elderly (P < 0.05). At the end of the cooling phase, systolic blood pressure (SBP) in the elderly was significantly higher than the young (155.8 +/- 16.1 and 125.0 +/- 12.5 mmHg, P < 0.01). There was a consistent age group difference in SBP during rewarming. Mean skin temperature was significantly lower in the elderly during rewarming (P < 0.05). T-re decreased more in the elderly and was significantly lower at the end of the experiment than the younger participants (36.78 +/- 0.34 and 37.01 +/- 0.15 degrees C, P < 0.05). However, there were no age group differences in thermal sensation. In conclusion, even normotensive elderly participants have a greater and more persistent BP response to cold than younger adults, suggesting that the elderly might be at a higher risk of cardiac events during cooling and subsequent rewarming. |
| Rights: | © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/85468 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 若林 斉
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