期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 92, 期 2, 页码 802-808出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00109.2001
关键词
fetus; fetomaternal thermal gradient; hyperthermia; sheep
We exposed Dorper-cross ewes at similar to120-135 days of gestation to a hot (40degreesC, 60% relative humidity) and a cold (4degreesC, 90% relative humidity) environment and to treadmill exercise (2.1 km/h, 5degrees gradient) and measured fetal lamb and ewe body temperatures using previously implanted abdominal radiotelemeters. When ewes were exposed to 2 h of heat or 30 min of exercise, body temperature rose less in the fetus than in the mother, such that the difference between fetal and maternal body temperature, on average 0.6degreesC before the thermal stress, fell significantly by 0.54 +/- 0.06degreesC (SE, n = 8) during heat exposure and by 0.21 +/- 0.08degreesC (n = 7) during exercise. During 6 h of maternal exposure to cold, temperature fell significantly less in the fetus than in the ewe, and the difference between fetal and maternal body temperature rose to 1.16 +/- 0.26degreesC (n = 9). Thermoregulatory strategies used by the pregnant ewe for thermoregulation during heat or cold exposure appear to protect the fetus from changes in its thermal environment.
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