长期体育锻炼和水浸对男性直立耐力的影响。

Effect of longitudinal physical training and water immersion on orthostatic tolerance in men.

作者信息

Greenleaf J E, Dunn E R, Nesvig C, Keil L C, Harrison M H, Geelen G, Kravik S E

机构信息

Space Physiology Branch, NASA Ames Research Center, Moffett Field, CA 94035.

出版信息

Aviat Space Environ Med. 1988 Feb;59(2):152-9.

PMID:3278710

Abstract

To test the hypothesis that moderately intense physical training has no effect on orthostasis, orthostatic and fluid-electrolyte-endocrine responses to 60 degrees head-up tilt were compared before and after 6 h of water immersion (34.5 +/- 0.1 degrees C) up to the neck following 6 months of exercise training. During the tilt test the five male subjects (27-42 years) each wore a lower-body positive-pressure suit (MAST-111A antishock trousers). The tilt procedure consisted of a 40-min supine control period (suit deflated), followed by a maximum 90-min tilt period (suit inflated to 50 +/- 5 mm Hg for 30 min, then deflated for 60 min or until presyncope). The mean +/- S.E. pretraining cycle ergometer peak VO2 was 3.20 +/- 0.14 L.min-1 (39 +/- 2 ml.min-1.kg-1), 3.36 +/- 0.27 L.min-1 (42 +/- 4 ml.min-1.kg-1) after 3 months (N.S.), and increased by 18% to 3.78 +/- 0.36 L.min-1 (48 +/- 5 ml.min-1.kg-1, +22%, p less than 0.05) posttraining. During pretraining, water immersion tilt tolerance decreased from 74 +/- 16 min before to 34 +/- 9 min (delta = 40 min, p less than 0.05) after immersion. During posttraining, water immersion tilt tolerance decreased similarly from 74 +/- 16 min preimmersion to 44 +/- 13 min (delta = 30 min, p less than 0.05) postimmersion (74 vs. 74 min, N.S.; 34 vs. 44 min, N.S.).(ABSTRACT TRUNCATED AT 250 WORDS)

摘要

为验证适度强度体育训练对直立性无影响这一假设，在进行6个月运动训练后，对6名男性受试者（27 - 42岁）进行颈部以下6小时水浸（34.5±0.1℃），比较浸水前后对60度头高位倾斜的直立性及体液 - 电解质 - 内分泌反应。在倾斜试验中，每位男性受试者均穿着下身正压服（MAST - 111A抗休克裤）。倾斜程序包括40分钟仰卧对照期（服装放气），随后是最长90分钟的倾斜期（服装充气至50±5毫米汞柱30分钟，然后放气60分钟或直至出现前驱晕厥）。训练前自行车测力计峰值VO₂均值±标准误为3.20±0.14升·分钟⁻¹（39±2毫升·分钟⁻¹·千克⁻¹），3个月后为3.36±0.27升·分钟⁻¹（42±4毫升·分钟⁻¹·千克⁻¹）（无显著差异），训练后增加18%至3.78±0.36升·分钟⁻¹（48±5毫升·分钟⁻¹·千克⁻¹，增加22%，p<0.05）。训练前，浸水后倾斜耐受时间从浸水前的74±16分钟降至34±9分钟（差值 = 40分钟，p<0.05）。训练后，浸水后倾斜耐受时间同样从浸水前的74±16分钟降至44±13分钟（差值 = 30分钟，p<0.05）（74分钟对74分钟，无显著差异；34分钟对44分钟，无显著差异）。（摘要截断于250字）