Glickman-Weiss E L, Nelson A G, Hearon C M, Goss F L, Robertson R J
Louisiana State University, Department of Kinesiology, Baton Rouge.
Undersea Hyperb Med. 1993 Sep;20(3):205-13.
The purpose of this investigation was to determine the relationship between core temperature (Tre), tissue insulation (I), and beta-endorphins (beta-END) during immersion in cold water. To test this, 21 males were immersed to the first thoracic vertebra for 120 min in stirred water at either 18 degrees, 22 degrees, or 26 degrees C. Subjects were divided with respect to body fat [high fat (HF) = 18-22%, n = 11; low fat (LF) = 8-12%, n = 10] and randomly assigned to one of the three temperatures. Blood was drawn at 25 and 5 min (T-25 and T-5, respectively) before immersion, after 1 h of immersion, and 5 min before the completion of the second hour (T + 60 and T + 120, respectively). No significant relationship was found between delta beta-END and delta I or delta Tre. The relationship between the changes in thermoregulatory variables and delta beta-END did not differ between the HF and LF groups. Also, beta-END (adjusted for plasma volume) was lower (P < 0.05) in the HF vs. the LF group. beta-END (pg.ml-1) increased (P < 0.05) as time increased from T-25 to T + 60 and were not progressive with duration of immersion. Thus, beta-END did not increase in proportion to level of heat loss.
本研究的目的是确定冷水浸泡期间核心温度（Tre）、组织隔热（I）和β-内啡肽（β-END）之间的关系。为了验证这一点，21名男性被浸泡至第一胸椎水平，在18℃、22℃或26℃的搅拌水中浸泡120分钟。受试者根据体脂情况进行分组[高脂肪（HF）=18 - 22%，n = 11；低脂肪（LF）=8 - 12%，n = 10]，并随机分配到三个温度之一。在浸泡前25分钟和5分钟（分别为T - 25和T - 5）、浸泡1小时后以及第二小时结束前5分钟（分别为T + 60和T + 120）采集血液。未发现δβ-END与δI或δTre之间存在显著关系。HF组和LF组之间，体温调节变量变化与δβ-END之间的关系没有差异。此外，HF组中经血浆量校正后的β-END低于LF组（P < 0.05）。从T - 25到T + 60，β-END（pg.ml-1）随时间增加而升高（P < 0.05），且不随浸泡持续时间呈渐进性变化。因此，β-END的增加与热损失水平不成比例。
