保健性游泳每次勿超过45分钟
<FONT size=4> 专家告诫，保健性游泳每次最佳时间在20到45分钟，切莫贪凉延长时间影响自身健康。据介绍，体重达71公斤的盛女士最近刚学会游泳，为了早点看到减肥的效果，她一连两三小时都泡在水中，或游泳或走动，她认为这样能快速消耗体能，还能消暑。谁曾想泡水时间一长，便感觉浑身不适心动过速。</FONT><P><FONT size=4> 有关专家指出，人在水中容易散热，但在水中时间过长，身体产生的热量低于水中散热，体温调节功能就会遭到破坏，这时会出现皮肤中动脉收缩，小静脉扩张，使血液停滞在皮下静脉内，造成皮肤青紫、嘴唇发黑，身上起“鸡皮疙瘩”，甚至发生痉挛现象。</FONT></P><P><FONT size=4> 也有专家认为，长时间泡在水中，会因氯元素侵袭致病。城市所使用的自来水供水系统大都采用氯消毒，人们游泳时，直接与氯接触，这些物质会从水中蒸发并直接被皮肤吸收。一般20分钟以内的氯吸入对人体无大影响，但随着时间增长，就可能导致人体罹患各种疾病。</FONT></P><P><FONT size=4> 因此，长时间在水中游泳，特别是在很凉的水中游泳，对身体不一定有好处。如果感觉有不适症状时，应立即上岸擦干身上的水，晒晒太阳，待暖和后尽快穿好衣服，以防感冒、心动过速、肌肉劳损等病症发生。</FONT></P> <P> </P><P> <FONT face=方正舒体 color=#42e61a size=7> 有道理，其实无论干什么都应有度、有时、有节制。为什么把时间定在四十五分钟，这是由科学道理的，学生上课的时间一般是四十五分钟，同样无论做什么运动也应该掌握时间，人的精力持续时间就在这么长时间为最佳。</FONT></P> 原文由 水上飘飘乐 发表: <br><P> </P><P> <FONT face=方正舒体 color=#42e61a size=7> <FONT color=#f70968 size=5>关老师讲有道理，其实无论干什么都应有度、有时、有节制。为什么把时间定在四十五分钟，这是由科学道理的，学生上课的时间一般是四十五分钟，同样无论做什么运动也应该掌握时间，人的精力持续时间就在这么长时间为最佳。</FONT></FONT></P><FONT color=#f70968 size=5></FONT> <FONT face=隶书 color=#4d2bd5 size=6>学习了</FONT> 好帖子支持! 原文由 标哥 发表: <FONT face=隶书 color=#4d2bd5 size=6>学习了</FONT> <FONT size=7>专家告诫</FONT> <FONT size=7>好帖！知识性强。</FONT> 原文由 标哥 发表: <FONT face=隶书 color=#4d2bd5 size=6>学习了</FONT> 好，我每次游半小时左右。 好贴,学习了. <SPAN id=yu><BR><WBR><A href="http://joke.tom.com/img/assets/1/jyw1960.jpg" target=_blank><IMG style="VERTICAL-ALIGN: baseline! important" height=357 src="http://joke.tom.com/img/assets/1/jyw1960.jpg" width=334 border=0></A><WBR><WBR><A href="http://joke.tom.com/img/assets/1/jyw1956.jpg" target=_blank><IMG style="VERTICAL-ALIGN: baseline! important" height=409 src="http://joke.tom.com/img/assets/1/jyw1956.jpg" width=327 border=0></A><WBR><WBR><A href="http://joke.tom.com/img/assets/1/jyw1955.jpg" target=_blank><IMG style="VERTICAL-ALIGN: baseline! important" height=373 src="http://joke.tom.com/img/assets/1/jyw1955.jpg" width=409 border=0></A><WBR><WBR><A href="http://joke.tom.com/img/assets/1/jyw1954.jpg" target=_blank><IMG style="VERTICAL-ALIGN: baseline! important" height=191 src="http://joke.tom.com/img/assets/1/jyw1954.jpg" width=450 border=0></A><WBR><WBR><A href="http://joke.tom.com/img/assets/1/jyw1939.jpg" target=_blank><IMG style="VERTICAL-ALIGN: baseline! 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