Six minutes of high-intensity exercise could extend the lifespan of a healthy brain and delay the onset of neurodegenerative disorders, such as Alzheimer’s disease and Parkinson’s disease, according to a study published in the Journal of Physiology. Research shows that a short but intense bout of cycling increases the production of a specialized protein called BDNF that is essential for brain formation, learning and memory, and could protect the brain from age-related cognitive decline. This insight on high-intensity exercise is part of the drive to develop accessible, equitable, and affordable non-pharmacological approaches that anyone can adopt to promote healthy aging.
Animal studies have shown that increasing the availability of the specialized protein, named brain-derived neurotrophic factor (BDNF), encourages the formation and storage of memories, enhances learning, and overall boosts cognitive performance. These key roles and its apparent neuroprotective qualities have led to the interest in BDNF for aging research.
According to lead author Travis Gibbons from University of Otago, New Zealand:
“BDNF has shown great promise in animal models, but pharmaceutical interventions have thus far failed to safely harness the protective power of BDNF in humans. We saw the need to explore non-pharmacological approaches that can preserve the brain’s capacity which humans can use to naturally increase BDNF to help with healthy aging.
“To tease apart the influence of fasting and exercise on BDNF production the researchers, from the University of Otago, New Zealand, compared the following factors to study the isolated and interactive effects:
- Fasting for 20 hours,
- Light exercise (90-minute low intensity cycling),
- High-intensity exercise (six-minute bout of vigorous cycling),
- Combined fasting and exercise.
“They found that brief but vigorous exercise was the most efficient way to increase BDNF compared to one day of fasting with or without a lengthy session of light exercise. BDNF increased by four to five-fold (396 pg L-1 to 1170 pg L-1) more compared to fasting (no change in BDNF concentration) or prolonged activity (slight increase in BDNF concentration, 336 pg L-1 to 390 pg L-1).
“The cause for these differences is not yet known and more research is needed to understand the mechanisms involved. The observed increase in BDNF during exercise could be due to the increased number of platelets (the smallest blood cell) which store large amounts of BDNF. The concentration of platelets circulating in the blood is more heavily influenced by exercise than fasting and increases by 20%.
“Twelve physically active participants (six males, six females aged between 18 and 56 years) took part in the study. The balanced ratio of male and female participants was to provide a better representation of the population rather than indicate sex differences. Further research is underway to delve deeper into the effects of calorie restriction and exercise to distinguish the influence on BDNF and the cognitive benefits.
“We are now studying how fasting for longer durations, for example up to three days, influences BDNF. We are curious whether exercising hard at the start of a fast accelerates the beneficial effects of fasting. Fasting and exercise are rarely studied together. We think fasting and exercise can be used in conjunction to optimize BDNF production in the human brain.”