Improve Flexibility with Research-Supported Stretching Protocols | Huberman Lab Podcast #76

Neural Insights

Understanding flexibility involves exploring the neural mechanisms that regulate it. Andrew Huberman highlights the role of von Economo neurons, which are uniquely enriched in humans and play a crucial part in evaluating body movements and discomfort 1. These neurons help us decide whether to "relax into a stretch" or push through discomfort, impacting our flexibility training outcomes.

These von Economo neurons sit at this junction where they're able to evaluate what's going on inside our body and allow us to access neural circuitries by which we can shift our relative level of alertness down a bit.

--- Andrew Huberman

Additionally, the nervous system's ability to override reflexes, such as the monosynaptic stretch reflex, is essential for effective stretching 2.

   

Muscle Dynamics

Flexibility is deeply rooted in the structure of muscles, particularly the sarcomeres, myosin, and actin. Andrew Huberman explains that while muscles don't actually lengthen, changes occur within these components that affect flexibility 3. The interaction between myosin and actin, along with the spacing of sarcomeres, plays a significant role in muscle contraction and flexibility.

The idea of making our muscles longer reflects a number of processes that occur basically within an existing muscle length.

--- Andrew Huberman

These changes, influenced by regular stretching, can enhance the resting state of muscles, thereby improving range of motion 4.

   

Aging & Flexibility

Flexibility naturally decreases with age, but understanding the biological mechanisms can help mitigate this decline. Andrew Huberman notes that flexibility decreases by about 1% per year from age 20 to 49, emphasizing the importance of a dedicated stretching practice to maintain limb range of motion 5. The muscle stretch reflex, involving sensory neurons and motor neurons, is a key factor in regulating safe range of motion.

A dedicated stretching practice can increase limb range of motion.

--- Andrew Huberman

This reflex ensures muscles contract to prevent overextension, protecting against injury while allowing for flexibility improvements 6.