Cross-sectional study observes differences in cardiovascular regulatory responses in mild cognitive impairment
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Key Takeaway
Note that individuals with MCI may exhibit less consistent cardiovascular regulatory responses to acute cognitive stress.
This cross-sectional observational study examined the directional uniformity of cardiovascular regulatory responses, measured via the Harmonic Response Consistency Score (HRCS), during acute cognitive stress. The study compared community-dwelling older adults in southern Taiwan, stratified by MoCA scores into a Reference group (MoCA ≥26), an MCI group (MoCA 18-25), and a dementia-level group (MoCA <18).
In the comparison between the MCI and Reference groups, the MCI group demonstrated significantly lower HRCS values in the Cn domain (mean difference: 2.60; 95% CI 0.29-4.91; p=0.020) and the PnSD domain (mean difference: 1.98; 95% CI 0.04-3.92; p=0.030). While the Reference group exhibited high response consistency with a mean HRCS of 9.00 and coordinated harmonic down-modulation, the MCI group showed attenuated and directionally heterogeneous responses.
The authors noted that the dementia-level group (MoCA <18) was excluded from task-evoked analyses. Because this is a cross-sectional observational study, the findings describe differences in response organization during a cognitive task rather than causal relationships.
These findings suggest that pulse-harmonic profiling may potentially serve as a physiological index of cardiovascular regulatory coherence. Such profiling could eventually enhance the sensitivity of non-invasive, community-based screening for early cognitive aging, though further research is required.
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View Original Abstract ↓
To evaluate whether hemodynamic responses to acute cognitive stress, measured via pulse-wave harmonic analysis, can characterize cardiovascular regulatory coherence and differentiate older adults with mild cognitive impairment (MCI) from cognitively intact individuals, this exploratory cross-sectional observational study utilized a within-session pre-post cognitive task design. A total of 101 community-dwelling older adults in southern Taiwan were stratified by Montreal Cognitive Assessment (MoCA) scores into Reference (MoCA [≥]26, n=12, paired n=10), MCI (MoCA 18-25; n=50, paired n=45), and dementia-level (MoCA <18; n=39) groups, the latter being excluded from task-evoked analyses. The primary outcome was the Harmonic Response Consistency Score (HRCS), quantifying the directional uniformity of cardiovascular regulatory responses, alongside secondary measures of harmonic amplitudes (Cn) and phase angles (Pn). Although mean pre-post changes were subtle, response organization differed by cognitive status. The Reference group exhibited high response consistency (mean HRCS = 9.00), characterized by coordinated harmonic down-modulation. Conversely, the MCI group showed attenuated, directionally heterogeneous responses. Compared to the Reference group, the MCI group demonstrated significantly lower HRCS values for the Cn domain (Mean difference: 2.60, 95% CI 0.29-4.91; p=0.020) and PnSD domain (Mean difference: 1.98, 95% CI 0.04-3.92; p=0.030), indicating a breakdown in regulatory coherence. These findings suggest that acute cognitive stimulus reveals coherent harmonic down-modulation in cognitively intact older adults but fragmented responses in MCI. Pulse-harmonic profiling thus serves as a robust physiological index of cardiovascular regulatory coherence, which, when integrated with neuropsychological assessments, may enhance the sensitivity of non-invasive, community-based screening frameworks for early cognitive aging.
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