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人类骨骼为何变轻?都是因为懒 - 站长搜索
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人类骨骼为何变轻?都是因为懒

业界动态 2014-12-24 08:00:04 转载来源: 网络整理/侵权必删

站长搜索(www.adminso.com):人类骨骼为何变轻?都是因为懒 美国研究人员22日在美国《国家科学院学报》上报告说,与黑猩猩以及已灭绝的人类物种相比,现代人的骨骼相对较轻而脆弱,这大概是1.2万年前人类从狩猎转向农业生产后变得“懒惰”,身体活动大幅减少所致。报告第一作者、美国史密森学会自然历史国家博物馆的哈比巴・奇尔奇尔说,他们曾猜测,骨骼变轻发生在人类祖先数百万年前走出非洲的时期,因为这会让其走得更远

站长搜索(www.adminso.com):人类骨骼为何变轻?都是因为

美国研究人员22日在美国《国家科学院学报》上报告说,与黑猩猩以及已灭绝的人类物种相比,现代人的骨骼相对较轻而脆弱,这大概是1.2万年前人类从狩猎转向农业生产后变得“懒惰”,身体活动大幅减少所致。

报告第一作者、美国史密森学会自然历史国家博物馆的哈比巴・奇尔奇尔说,他们曾猜测,骨骼变轻发生在人类祖先数百万年前走出非洲的时期,因为这会让其走得更远。

但针对现代人、黑猩猩以及跨越数百万年的已灭绝人类物种化石的骨密度分析表明,人类的骨密度在进化过程中一直保持着较高水平,直到1.2万年前人类从狩猎转向农业生产后,骨密度才显著下降。骨密度降低的情况在下肢比在上肢表现得更明显,这显示骨密度与运动水平有关。

研究人员由此认为,人类在1.2万年前开始使用农业工具来生产食物,开始找地方定居下来,身体活动显著减少,导致骨骼变轻。

标签: 人类 骨骼 为何 变轻 是因为


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