کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2843127 1166074 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of simulated natural air movement on thermoregulatory response during head-down bed rest
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Effects of simulated natural air movement on thermoregulatory response during head-down bed rest
چکیده انگلیسی


• Rectal temperature (Tre) was significantly elevated after 29 days of bed rest.
• Simulated natural air flow returned Tre to control level before bed rest.
• Simulated natural air flow restored Tre more effectively than constant air flow.
• Higher turbulence intensity in simulated natural air flow may lead to Tre decrease.

Spaceflight and its bed rest analog impair thermoregulatory responses, including elevated core temperature observed at rest and during exercise. Natural air flow has been found to increase cold sensation significantly compared to artificial constant air flow (CAF). The present study tested the hypothesis that simulated natural air flow (SNAF) ventilation would ameliorate impaired thermoregulatory function to a greater extent than CAF under simulated microgravity conditions. Seven healthy males underwent 30 days of −6° head-down bed rest (HDBR). During pre-HDBR and the day 29 of HDBR (HDBR 29), the subjects were exposed to three air flow patterns at 23 °C while in a supine posture: a still air flow control (CON), CAF, and SNAF. The mean air velocity of the latter two patterns was 0.2 m/s. Subjective perception of the thermal environment was recorded by thermal sensation vote (TSV), and rectal temperature (Tre), skin temperature (Tsk), and cutaneous vascular conductance (CVC) were also measured during the sessions. Tre was significantly elevated after 29 days of HDBR and decreased to a greater extent in SNAF than in CAF on HDBR 29. However, there was no significant difference between Tre in SNAF on HDBR 29 and that in CON on pre-HDBR. Mean Tsk, CVC, and TSV in SNAF were also significantly lower than those in CAF on HDBR 29. Moreover, TSV was close to ‘neutral’ under SNAF on HDBR 29. These data indicate that simulated natural air movement might be more effective than constant air movement at preserving core temperature at a thermoneutral ambient temperature during HDBR.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Thermal Biology - Volume 38, Issue 7, October 2013, Pages 363–368
نویسندگان
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