衰老对人类大脑血液动力学反应功能的全球影响
Nooshin J Fesharaki1, Amanda Taylor1, Keisjon Mosby1
1Baylor College of Medicine.
Research square
|September 18, 2023
概括
正常的衰老会影响大脑的血液动力学,影响功能磁共振成像 (fMRI) 研究. 这项研究揭示了血液动力学反应功能 (HRF) 参数的与年龄相关的变化,表明HRF是衰老的潜在生物标志物.
科学领域:
- 神经成像是一种神经成像.
- 认知神经科学 认知神经科学
- 血管生物学 血管生物学
背景情况:
- 功能磁共振成像 (fMRI) 依赖于血液动力反应函数 (HRF) 来推断神经活动.
- 在认知衰老研究中解释fMRI数据通常假设HRF是稳定的,仅将激活差异归因于神经变化.
- 新出现的证据表明,正常衰老会影响大脑血管和血液动力学,这可能会混衰老研究中的fMRI解释.
研究的目的:
- 在广泛的年龄范围内调查血液动力学响应功能 (HRF) 与年龄相关的变化.
- 为了确定与衰老相关的血管和代谢变化是否影响HRF特征.
- 探索HRF参数作为与年龄相关变化的生物标志物的潜力.
主要方法:
- 利用多感官刺激唤起大脑皮层大约87%的HRF.
- 研究了22-75岁的认知完整的成年人.
- 在本地空间坐标中使用无模型参数来表征正负HRF.
主要成果:
- 在HRF参数分布中确定了与年龄相关的显著趋势.
- 观察到年龄对HRF振幅 (例如,峰值振幅,CNR) 和时间动态 (例如,全宽半最大) 的影响.
- 证明衰老会影响HRF的血管和代谢基础.
结论:
- 正常的衰老显著改变了血液动力学反应功能 (HRF) 的特征.
- HRF参数表现出与年龄相关的变化,独立于神经活动变化.
- HRF分析作为检测与年龄相关的血管和代谢病理的敏感生物标志物具有前景.
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