South African Africans have been reported to have experienced negative or null secular trends in stature and other measures of skeletal structure across the 19th and 20th centuries, presumably due to poor living conditions during a time of intensifying racial discrimination. Here, we investigate whether any secular trend is apparent in limb bone strength during the same period.

中文翻译：

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在19世纪和20世纪，南非非洲人的肢体骨骼强度长期下降。

据报道，南非人在19世纪和20世纪经历了身高和其他骨骼结构测量值的长期或负性长期趋势，大概是由于种族歧视加剧期间的生活条件差。在这里，我们调查在同一时期肢体骨强度是否存在任何长期趋势。