Abstract
Cardiorespiratory fitness (CRF) mitigates age-related decline in cognition and brain volume. Little is known, however, about the effects of high-intensity interval training (HIIT) on cognitive aging and the relationship between HIIT, cognition, hippocampal subfield volumes, and cerebral oxygen extraction fraction (OEF). Older sedentary women participated in an 8-week HIIT intervention. We conducted cognitive assessments, fitness assessments (VO2max), MRI scans: asymmetric spin echo oxygen extraction fraction (ASE-OEF), high-resolution multiple image co-registration and averaging (HR-MICRA) imaging, and transcranial Doppler ultrasonography before and after the intervention. VO2max increased from baseline (M = 19.36, SD = 2.84) to follow-up (M = 23.25, SD = 3.61), Z = − 2.93, p < .001, r = 0.63. Composite cognitive (Z = − 2.05, p = 0.041), language (Z = − 2.19, p = 0.028), and visuospatial memory (Z = − 2.22, p = 0.026), z-scores increased significantly. Hippocampal subfield volumes CA1 and CA3 dentate gyrus and subiculum decreased non-significantly (all p > 0.05); whereas a significant decrease in CA2 (Z = − 2.045, p = 0.041, r = 0.436) from baseline (M = 29.51; SD = 24.50) to follow-up (M = 24.50; SD = 13.38) was observed. Right hemisphere gray matter was correlated with language z-scores (p = 0.025; r = 0.679). The subiculum was correlated with attention (p = 0.047; r = 0.618) and verbal memory (p = 0.020; r = 0.700). The OEF and CBF were unchanged at follow-up (all p > .05). Although we observed cognitive improvements following 8 weeks of our HIIT intervention, they were not explained by hippocampal, OEF, or CBF changes.
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This manuscript was funded in part by the National Institute of General Medical Sciences (NIGMS) 5 T32 GM109780-4 (AMN), NIHR01NS082561 (HA), NIHRF1NS116565 (HA), and The Evelyn F. McKnight Brain Institute at the University of Alabama at Birmingham (RML).
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Norling, A.M., Gerstenecker, A., Bolding, M.S. et al. Effects of a brief HIIT intervention on cognitive performance in older women. GeroScience 46, 1371–1384 (2024). https://doi.org/10.1007/s11357-023-00893-4
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DOI: https://doi.org/10.1007/s11357-023-00893-4