A Systematic Review on the Current Literature

The Neuroscience and Yoga Conference recently sent out a newsletter with a Research Study, here is the breakdown & key takeaways.

Population

• Healthy adults across the lifespan included in 11 neuroimaging studies from 2009 to 2019

• Both novice and experienced yoga practitioners

• Older adults (including those at risk of age-related cognitive decline)

Intervention

• Interventions varied substantially:

  • Structured interventions ranging from 8 – 24 weeks

  • Cross-sectional comparisons based on years of yoga experience

• Various styles of yoga across the studies, from Hatha to Kundalini

• Typically combinations of asanas, pranayama and meditation

Comparison

• Comparisons between regular yoga practitioners vs non-practitioners

• Pre- vs post-practice comparisons in longitudinal designs for non-practitioners

• In some studies, dose-response relationships were explored (years of practice, hours per week)

Outcomes

1. Structural Brain Changes

   1. Increased gray matter volume/thickness in regions linked to learning, emotion, memory and executive function (e.g., hippocampus, amygdala, prefrontal cortex, cingulate cortex).

   2. Across several studies, neural differences were associated with better memory, emotional regulation and attentional capacities

2. Functional Brain Changes

   1. Alterations in functional connectivity and activity within default mode network (DMN) and prefrontal–limbic circuits

   2. Some evidence of reduced baseline cerebral blood flow post intervention, interpreted as enhanced neural efficiency

3. Dose-Dependent Associations

   1. Some evidence of greater brain differences associated with longer duration of yoga practice and higher practice frequency

Limitations / Risk of Bias

• Small sample sizes typical of imaging studies limit generalizability

• High heterogeneity in yoga styles, practice dose and duration and Imaging methods (MRI, fMRI, SPECT), making it difficult to form robust conclusions

• Lifestyle confounds like physical activity, diet and sleep were not consistently controlled, adding potential confounds to data

• Predominantly cross-sectional designs cannot establish causality

Conclusion

• Consolidates early but promising evidence that long-term yoga practice is associated with measurable changes in brain structure and function that align with improved cognitive, emotional and stress adaptation capacities, beyond general physical fitness

• However, the evidence remains associational rather than causal.

• Future research with larger, controlled, and longitudinal designs will be essential to confirm mechanisms and definitive proof of causality.

Source: The Research Study

Feel free to share your thoughts or ask any questions about yoga practices. Namaste!