That may be why people with less gray matter volume in these areas are more sensitive to pain, and vice versa, the researchers said.

研究人员表示，这可能就是在上述脑区灰质较少的人对疼痛更为敏感的原因。

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At the same time, those whose physical activity increased over a five-year period — though these cases were few — showed notable increases in gray-matter volume in those same parts of their brains.

此外，在5年期间体育活动有所增加的老年人——尽管这样的例子并不多——脑部相同部位中的灰质量也显著增加了。

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At the same time, those whose physical activity increased over a five-year period — though these cases were few — showed notable increases in gray-matter volume in those same parts of their brains.

此外，在5年期间体育活动有所增加的老年人——尽管这样的例子并不多——脑部相同部位中的灰质量也显著增加了。

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