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- W1985124458 abstract "Cardiovascular arousal correlates to activity within the medial prefrontal cortex (MPFC). Additional evidence provides anatomical and functional links between the MPFC and hippocampus (HC). This study tested the hypothesis that the MPFC and HC form a sub-network associated with rapid heart rate (HR) responses to volitional effort. Primary analyses were performed on 29 individuals (18 males) ranging from 21 to 80 years of age, who produced a HR response >3bpm to an isometric handgrip (IHG) task. HR and cortical activity were recorded using functional magnetic resonance imaging with blood oxygen level-dependent contrast. The average change in HR from baseline was 6bpm ±2. Activity in the MPFC and left HC was reduced relative to baseline in all subjects when correlated with the HR time course. Measures of connectivity demonstrated that the MPFC engaged in significantly stronger functional connectivity to the left HC during a 40% IHG task. Effective connectivity revealed a directionality of influence from the MPFC to the left HC. A second group (n=15) of individuals without a HR response (~1bpm) to IHG were studied post-hoc and these individuals showed no deactivation in either the MPFC or left HC. These results suggest the presence of a MPFC-HC axis that participates in the neurally-mediated HR response to exercise." @default.
- W1985124458 created "2016-06-24" @default.
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- W1985124458 date "2013-11-01" @default.
- W1985124458 modified "2023-09-23" @default.
- W1985124458 title "Evidence for a medial prefrontal cortex–hippocampal axis associated with heart rate control in conscious humans" @default.
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- W1985124458 doi "https://doi.org/10.1016/j.brainres.2013.09.032" @default.
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