Evaluation of the Human Thermal Comfort under Simulated Weightlessness: an Experimental Study Based on the Power Spectrum Analysis of the Heart Rate Variability

Zhu, Hui; Wang, Hanqing; Li, Duanru; Xiao, Zijian; Su, Hua; Kuang, Xiaogen

doi:10.1007/s12217-018-9669-7

Cited by 10 publications

(9 citation statements)

References 40 publications

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“…This finding is in accordance with our previous studies on thermal sensation under simulated weightlessness. 29 Questionnaire survey results about the thermal preference were shown in Figure 7. As is observed from Figure 7, the most percentage of ‘unchange’ preference of participants after HDBR appeared at 28°C and 30°C, and participants expressed warmer expectations when exposed at 22°C, 24°C and 26°C, which indicated that the human body in weightlessness might prefer a warmer environment than under normal condition.…”

Section: Resultsmentioning

confidence: 99%

“…28 Therefore, HVR indices might be indicative of the thermal state of the human body. Some indices of HRV were related to the thermoregulation of the human body, 29,30 especially the low frequency (LF) power and high frequency (HF) power. The HRV index, LF/HF, has been used to indicate the thermal comfort.…”

Section: Methodsmentioning

confidence: 99%

“…The HRV index, LF/HF, has been used to indicate the thermal comfort. 29 The HRV was acquired from the ECG data recorded using the Holter during the whole experiment. The sampling rate of the Holter ranges from 250 Hz to 400 Hz, and its bandwidth ranges between 0.05 Hz and 40 Hz, which are enough to capture the ECG data during the experiment.…”

Section: Methodsmentioning

confidence: 99%

“…Air temperatures were set at 32°C and 35°C to provide an adequate stimulus for the physiological sweating of all participants. The relative humidity (RH) selected during Stage 1 and Stage 3 was the same as our previous studies 26,29 (30 ± 3%, 45 ± 3%, 60 ± 3%, 80 ± 3%). As for the air movement, our previous findings revealed that it has much less effect on the thermal comfort than the air temperature under simulated weightlessness; thus, the air movement was not included in our research.…”

Section: Methodsmentioning

confidence: 99%

“…An environmental chamber, which has been described previously, 34 was used to realise different temperatures for the experiment. In this study, participants were exposed to seven different temperatures ( 26,29 (30 AE 3%, 45 AE 3%, 60 AE 3%, 80 AE 3%). As for the air movement, our previous findings revealed that it has much less effect on the thermal comfort than the air temperature under simulated weightlessness; thus, the air movement was not included in our research.…”

Section: Environmental Conditions and Apparatusmentioning

confidence: 99%

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Thermal comfort under weightlessness: A physiological prediction

Zhu

Huang

et al. 2020

Indoor and Built Environment

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This study investigated the physiological thermal response of people under simulated weightlessness using a 6° head down bed rest (HDBR) model to ensure the human body functions in the weightlessness way. Thermal responses of six male participants were experimentally determined. The relationship between thermal comfort and heart rate variability (HRV) was also scrutinized. Physiological responses of participants under different environmental conditions were observed including core temperature, sweating, and most importantly, HRV. Elevated core temperatures were observed amongst participants, with a maximum increment of 0.5°C. The sweating of participants under simulated weightlessness was conspicuously retarded, requiring a 2–4°C increase in environmental temperature to start sweating. Body regional differences in the sweating were also observed. The HRV index ‘LF/HF’, which reflects the balance of the autonomous nervous system, was found to vary with the environment and closely associated with the variation in the thermal comfort scores. Participants under simulated weightlessness had higher mean LF/HF when they felt comfortable, and they preferred a warmer environment in comparison to under normal gravity condition. An altered thermoregulation of the human body under simulated weightlessness was indicated by our findings. The use of HRV index could provide a useful prediction of subjective thermal comfort under weightlessness.

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Section: Resultsmentioning

confidence: 99%