Patrick J M
Ann Hum Biol. 1976 Jul;3(4):383-6. doi: 10.1080/03014467600001611.
The thoracic and lumbar curvatures of 105 Nigerian adults have been measured with a flexible rule (flexicurve). The lumbar curvature is relatively greater in women. Compared with a previous survey of Europeans, the curvatures in both men and women appear to be about 20 per cent greater in Nigerians. This is likely to be a genetic difference but the Nigerian practice of carrying heavy loads on the head may be a contributory factor.
用软尺（柔性曲线尺）测量了105名尼日利亚成年人的胸曲和腰曲。女性的腰曲相对更大。与之前对欧洲人的调查相比，尼日利亚男性和女性的曲度似乎都比欧洲人大约大20%。这可能是基因差异，但尼日利亚人用头顶重物的习惯可能也是一个促成因素。
