Human body temperature and cardiovascular response to changes in ambient temperature and body posture
Year: 2024
Type: article
Abstract: Health problems due to heat or cold exposure is closely related not only to body temperature (BT) but also to blood flow rate (BFR) and blood pressure (BP). Therefore, it is necessary to understand the physiological mechanisms of the human body, such as how these physiological quantities change and how they affect each other. In this study, to clarify the physiological mechanisms of the human body, we measured the whole-body distribution of BT and BFR, as well as BP, heart rate, and metabolic rate under changes in ambient temperature and body posture. A total of 19 subjects were tested in three cases, including the temperature up-step and down-step cases, where the ambient temperature changed from 28 °C to 38 °C or 18 °C in the supine position, and the posture change case, where the posture changed alternately between the supine and standing positions at an ambient temperature of 28 °C. The results showed that the core temperature was efficiently maintained due to BFR regulation, especially in the extremities, in response to changes in ambient temperature. Additionally, changes in cerebral BFR in response to changes in posture were suppressed due to regulation of BFR, especially in the lower limbs, and heart rate. Furthermore, in the extremities, the BFR not only in the skin but also in the subcutaneous tissue and muscle was estimated to increase in hot environments and decrease in cold environments. • Blood flow rate (BFR), etc. were measured under temperature and posture changes. • Core temperature was maintained by regulating BFR, especially BFR in the limbs. • Cerebral BFR during standing was regulated mainly by lower-limb BFR and heart rate. • BFR in the subcutaneous tissue was estimated to change in hot/cold environments. • BFR in the muscle was also estimated to change in hot/cold environments.
Source: Building and Environment
Authors: Tomonobu Goto, Zhuoxi Niu, Yuki Chiba, Kentaro Amano, Yoshifumi Saijo
Institutions: Tohoku University, Takenaka (Japan)
Language: English
Subfield: Physiology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: hybrid
Estimated APC paid: $4,200
OpenAlex ID: W4402437503