EFFECTS OF DYNAMIC AIRFLOW ON BODY TEMPERATURE DURING 30-DAY HEAD-DOWN BED REST

摘要

To investigate the effects of dynamic airflow on body temperature during 30d -6°head-down bed rest (HDBR). Seven males took part in the three arranged sessions on the 10th day, 20th day and 29th day during 30d HDBR. Artificial airflow environment was varied in control state (C), constant airflow (CON) and dynamic airflow (DYN) in the three sessions respectively. Air temperature was 23°C. Subjective perception of general thermal sensation, rectal (Tr), skin temperature and skin blood flow (SkBF) were measured. Compared with under C, the Tr (p<0.01), average skin temperature ( s T ) and SkBF (p<0.05) under CON and DYN were significantly decreased, subjective perception increased under DYN (p＝0.038). The Tr under DYN was significantly higher than that under CON. No differences were found in s T , SkBF and subjective perception between under CON and DYN. Dynamic airflow can inhibit the decrease of core temperature compared under constant airflow and there was no significant difference in general thermal sensation between the two environments. Therefore, dynamic airflow was more helpful to thermoregulation than constant airflow in 23°C during HDBR.