Boost Your Brain Power: The Surprising Connection Between Exercise and Brain Growth

Understanding Exercise-Induced Brain Growth

Current Knowledge Gaps

The precise mechanisms through which exercise fosters brain growth and sustains brain health remain largely unexplored. Researchers are investigating the role of the VEGF hormone in the increase of brain volume following physical activity. While previous studies have established that exercise enhances brain health, the underlying processes that drive this growth are still not fully understood. Notably, exercise has been shown to enlarge the hippocampus, a critical area for learning and memory, which is characterized by a rich blood supply.

The Role of Hormones

Two hormones, IGF-1 and VEGF, are known to cross the blood-brain barrier and their levels rise in the bloodstream during exercise. IGF-1 is essential for growth during childhood, while VEGF is crucial for stimulating new blood vessel formation.

Recent Research Findings

Study Overview

A recent study conducted by Rich and colleagues, published in the Journal of Physiology, examined the impact of VEGF on brain growth resulting from exercise. The researchers utilized mice with a non-functional VEGF gene and compared their hippocampal size after exercise to that of mice with a functional VEGF gene.

Key Observations

The findings revealed that mice lacking the VEGF gene did not show increases in muscle mass or improved exercise outcomes, despite exercising at levels comparable to normal mice. Additionally, these mice did not exhibit hippocampal growth post-exercise, which contrasted with the normal mice that did experience this growth.

Unresolved Questions

Despite these findings, it remains uncertain whether VEGF is present directly within the hippocampus, complicating the assessment of its direct or indirect role in brain growth. There are several possibilities: VEGF might influence the release of other hormones, promote muscle growth that subsequently stimulates the nervous system and brain growth, or enhance blood flow to the hippocampus, thereby facilitating brain growth. Future research will be essential in determining whether VEGF directly stimulates brain growth or operates through indirect mechanisms.

References

Ballard, 2017. Exercise makes your brain bigger: skeletal muscle VEGF and hippocampal neurogenesis. J Physiol.
Rich et al., 2017. Skeletal myofibre vascular endothelial growth factor is required for the exercise training-induced increase in dentate gyrus neuronal precursor cells. J Physiol.