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。
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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