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Long-Term Improvement in Hippocampal-Dependent Learning Ability in Healthy, Aged Individuals Following High Intensity
Daniel G Blackmore1,2, Mia A Schaumberg3,4,5, Maryam Ziaei6
1Queensland Brain Institute, The University of Queensland, Brisbane, Australia.
Aging and Disease
|July 16, 2024
Summary
High-intensity interval training (HIIT) significantly boosts hippocampal function and memory in older adults. This improvement, including preserved brain volume and connectivity, lasts for at least five years, offering protection against cognitive decline.
Area of Science:
- Neuroscience
- Gerontology
- Exercise Physiology
Background:
- Physical exercise is linked to reduced dementia risk, but optimal regimens for cognitive benefits remain unclear.
- Hippocampal-dependent learning and memory are crucial for aging cognition but vulnerable to decline.
- Existing research shows varied effectiveness of exercise on cognitive function in the elderly.
Purpose of the Study:
- To compare the effects of three distinct 6-month exercise regimens on hippocampal-dependent cognition in healthy older adults.
- To investigate the long-term impact of exercise interventions on cognitive performance and brain structure.
- To identify potential biomarkers associated with exercise-induced cognitive improvements.
Main Methods:
- 151 healthy elderly participants (65-85 years) were randomized into low (LIT), medium (MIT), or high-intensity interval training (HIIT) groups.
- Participants completed 72 supervised exercise sessions over 6 months, with cognitive testing and blood collection monthly.
- Multimodal 7 Tesla MRI scans were performed at baseline, 6, and 12 months; cognitive and MRI data were tracked for up to 5 years.
Main Results:
- Only the HIIT group showed significant improvement in paired associative learning (PAL) after 6 months.
- HIIT led to preserved hippocampal volume and enhanced functional connectivity in neural networks, unlike LIT and MIT.
- Changes in brain-derived neurotrophic factor (BDNF) and cortisol levels correlated with cognitive improvements in the HIIT group.
Conclusions:
- High-intensity interval training (HIIT) significantly enhances and sustains hippocampal function in aging individuals.
- HIIT-induced improvements in brain structure and connectivity provide long-term cognitive protection against age-related decline.
- Biomarkers like BDNF and cortisol may help tailor exercise prescriptions for optimal cognitive health in the elderly.
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