Key result
Advanced age is linked to reduced cerebral oxygenation oscillations and ~12% lower blood pressure oscillations.
Why the study?
Does aging affect spontaneous oscillations in cerebral oxygenation and arterial blood pressure?
Cross-Sectional (n=35)
No
Does aging affect spontaneous oscillations in cerebral oxygenation and arterial blood pressure?
Effect estimate: 42% to 85% lower
p-value: p=<0.05
Aging is associated with reduced spontaneous oscillations in cerebral oxygenation, suggesting a cerebrovascular degenerative process.
May indicate cerebrovascular aging effects; hypothesis-generating for neurological risk and requires prospective validation.
The study aims to assess the spontaneous oscillations in elderly subjects based on the wavelet transform of cerebral oxygenation (CO) and arterial blood pressure (ABP) signals. Continuous recordings of near-infrared spectroscopy (NIRS) and ABP signals were obtained from simultaneous measurements in 20 young subjects (age: 27.3 ± 7.1 years) and 15 elderly subjects (age: 70.8 ± 5.1 years) at rest. Using spectral analysis based on wavelet transform, five frequency intervals were identified (I, 0.005 to 0.02 Hz; II, 0.02 to 0.06 Hz; III, 0.06 to 0.15 Hz; IV, 0.15 to 0.40 Hz; and V, 0.40 to 2.0 Hz). The average amplitudes of the Δ[HbO2] and tissue oxygenation index in intervals I to V and the relative amplitudes in intervals IV and V were significantly lower in elderly subjects than in young subjects (P<0.05). In addition, the relative amplitudes of the ABP in interval I were significantly lower in elderly subjects than in young subjects (P=0.016). The present findings suggest the presence of a cerebrovascular degenerative process caused by aging. Spontaneous oscillations in the CO could be used as an indicator of cerebrovascular changes and could be used to identify the risk for cerebrovascular degenerative processes.
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Li et al. (2013) conducted a cross-sectional in Healthy aging (n=35). Advanced age (Elderly) vs. Young subjects was evaluated on Average amplitudes of spontaneous oscillations in cerebral oxygenation (Δ[HbO2]) across five frequency intervals (42% to 85% lower, p=<0.05). Advanced age was associated with significantly lower spontaneous oscillations in cerebral oxygenation across multiple frequency intervals and a 12% reduction in arterial blood pressure oscillations at 0.005-0.02 Hz.
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