Study of the exercise prescription and evaluation method using a hand-ergo meter during standing in water

众所周知，在水中浸泡时，静水压力会引起心动过缓和行程容量增加。我们发现下腔静脉的横截面积随着水深的增加而明显增加。本研究的目的是明确运动处方和评估方法，使用手持式ergo仪在水中浸泡。我们有受试者的知情同意书。他们是自愿参加这项研究的。浸泡在水中的心率明显低于离开水的心率。这一结果表明，水浸泡增加静脉回流。阻断结束30秒后，心率显著增加。此后，心率降低到休息水平。阻断结束后下腔静脉横截面积明显减小。下腔静脉横截面积的减少在前20秒左右达到最低点，而非出水。这些结果表明，心率和下腔静脉横截面积的增减与静脉回流的体积有关，心率和下腔静脉横截面积的波动与静脉回流的速度有关。结论：(1)下腔静脉横截面积的变化作为水上运动运动处方的指标是比较合适的评价方法。(2)静脉回流确实影响下腔静脉的横截面积。(3)可以估算出在水中站立时静脉回流的速度约为20秒。(4)在40℃的水中泡足浴时，手力计的放松效果加快。

It is well known bradycadia and increase in stroke volume occur induced by hydrostatic pressure during water immersion. We clarified the cross sectional area of inferior vena cava significantly increased according with increasing water depth. The purpose of this study was to clear the exercise prescription and evaluation method using a hand-ergo meter during water immersion. We have informed consent for subjects. They were participated in this study for volunteer. Heart rate of in water immersion was significantly lower than out of water. This result suggests the water immersion increases the venous return. Heart rate significantly increased after thirty seconds at the end of the occlusion. Thereafter, heart rate was reduced to rest level. The cross sectional area of inferior vena cava significantly decreased after the end of the occlusion. However, the decrease of cross sectional area of inferior vena cava reached the bottom at about twenty seconds forward rather than out of water. These results suggest that increase and decrease of heart rate and cross sectional area of inferior vena cava are dependent in the volume of venous return and that the fluctuation of velocity of heart rate and cross sectional area of inferior vena cava is dependent in the velocity of venous return. lb summarize : (1)Changes of the cross sectional area of inferior versa cava is the appropriate evaluation method as a index of exercise prescription of water exercise. (2)The venous return does affect the cross sectional area of inferior vena cava. (3)It can be estimated the velocity of venous return was about twenty seconds during standing in the water. (4)A effect of relaxation is accelerated during exercise of hand-ergo meter using a foot-bath in water of 40℃.