The people attending the food fest were standing around, laughing and having a good time, gorging their fat faces with the food of the gods, when all of a sudden the swilling was drowned out with a high pitch squealing that was an octave or two higher than a dog whistle. The humans scrambled for the source of the terror only to find one of their offspring crying at the top of his lungs. What happened, one of them yells. I think the dog did something, another whispers. Just then, the human child begins to yelp one phrase repeatedly, over and over again, burning into their ears with the words "It's Hot, It's Hot". Well, much to my surprise, the humans started laughing so hard they were dropping like flies. I didn't understand why they thought it was so funny, but the next time any other kid drops his hot-dog on the ground, and then picks it up and eats it without giving me any, I'm gonna pee on his leg too. After all, now I k
同时其他的微量元素也必不可少,要全面发展。
一顿饭不吃死不了人,吸收营养才是关键。在饥饿时,身体对营养的吸收效率非常高。
第一节 儿童青少年生长发育
近20年来,世界各国的平均身高每10年增长1厘米。人类的身材出现了一代更比一代高的趋势。据记载:美国在200多年以前,全国的平均身高为170厘米,现已达到180厘米,增长了10厘米;近30年来,日本14岁的少年平均身高增加了8.2厘米;瑞典从1851年到1931年的80年中,新兵的身高从166.6厘米增加到174.1厘米,增加了7.5厘米;原苏联对18世纪军人的骨骼进行测量,发现在过去250年中,士兵的平均身高增加了20厘米。我国近20年里,18~25岁的城市青年,男子平均身高增加了2.3厘米、女子增加了2.15厘米。
一、测量身高
1、测量身高的好处
人们普遍认为体重变化快,因而常用体重的增减作为评定健康的客观标准。其实,用身高增长来评定生长发育、健康状况和疲劳程度其准确性也不亚于体重。
儿童青少年时期,每年测量1~2次(最好每季度测量一次)身高是及时掌握生长发育状况的重要手段之一。身高增长正常,说明生长发育良好;身高增长缓慢、基本不长、甚至停止增长就要分析原因,并采取相应的措施进行针对性补救。
中老年人经常测量身高,在一定程度上还可评定衰老程度。身高随年龄增长而降低,正常人以20~30岁为最高峰,从40岁开始,年龄每增加10岁,身高就降低1~2厘米。男性老年人的身高平均要降低2.25\\%,女性平均要降低2.5%。国外有人报告说,从40岁到90岁,人体身高可下降7~9厘米,甚至出现明显的驼背。人体这一生理变化,俗称“老缩”。
一日之内的身高变化还是评定生理负荷大小和疲劳程度的重要方法之一。就某一个体而言,早晨起床时最高,晚上睡觉前最矮。身高的这种变化与职业特征有着直接的关系,那些肩担、背扛的重体力劳动者和运动员,尤其是举重运动员,一日之内的身高变化更为明显,早晨起床时要比晚上睡觉前高出2~5厘米。这种变化的主要原因有两方面:一是脊柱椎