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

Name: Improve Flexibility with Research-Supported Stretching Protocols | Huberman Lab Podcast #76
Uploaded: 2024-03-22T18:00:36.490Z
Duration: 4 h 12 min 9 s

The Science and Practice of Flexibility and Stretching

In this podcast, Andrew Huberman, a Professor of Neurobiology and Ophthalmology at Stanford School of Medicine, discusses the science and practice of flexibility and stretching. He explains how flexibility is built into our basic body plan, its fundamental role in movement, injury prevention, inflammation reduction throughout the body, and even tumor growth adjustment.

The Mechanisms that Mediate Flexibility and Stretching

Andrew describes the mechanisms from your nervous system that mediate flexibility and stretching.

Your ability to improve flexibility can be used to powerfully modulate your ability to tolerate pain both emotional and physical pain.

Best Times and Ways to Stretch

Andrew presents what scientific literature says about the best times and ways to stretch.

There are multiple kinds of stretching such as holding a stretch for a long time or dynamic/ballistic stretching where you're swinging your limbs trying to increase range of motion.

Andrew explains the science and application of flexibility in sports performance whether engaging in cardiovascular exercise or resistance exercise.

Simple Tools Grounded in Scientific Research

By the end of today's episode, listeners will have simple easy-to-apply tools grounded in scientific research that they can apply for their specific goals.

Personalized Nootropic Starter Kit

In this section, the speaker talks about nootropics and how they have been a game changer for him. He provides information on how to get your own personalized nootropic starter kit.

Getting Your Own Personalized Nootropic Starter Kit

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InsideTracker

In this section, the speaker talks about InsideTracker, a personalized nutrition platform that analyzes data from blood and DNA to help people better understand their body and reach their health goals.

Understanding Your Body with InsideTracker

InsideTracker analyzes data from blood and DNA to help you better understand your body and reach your health goals.

The platform lets you look at those numbers and then move your cursor over them for little popup windows that will tell you what lifestyle changes you can make.

Visit insidetracker.com/huberman to get 20% off any of InsideTracker's plans by using the code HUBERMAN at checkout.

Eight Sleep Mattress Cover

In this section, the speaker talks about Eight Sleep mattress covers that have cooling, heating, and sleep tracking capacity. He shares his experience with sleeping on an Eight Sleep mattress cover.

Sleeping Better with Eight Sleep Mattress Cover

Eight Sleep makes smart mattress covers that have cooling, heating, and sleep tracking capacity.

You can program the temperature of your sleeping environment from when you go to sleep until when you wake up in the morning.

The speaker shares his experience of sleeping on an Eight Sleep mattress cover and how it helped him sleep throughout the night and wake up feeling refreshed.

Go to eightsleep.com/huberman to check out the Pod Pro Cover and save $150 at checkout.

Flexibility and Stretching

In this section, the speaker talks about flexibility and stretching. He highlights some of the features that are already built into your nervous system and body that allow you to be flexible.

Features That Allow You to Be Flexible

Some people feel tighter than others, sometimes in specific limbs or areas of their body.

Some people feel really loose and limb, while some have hyper-flexibility in their joints.

The speaker emphasizes that everyone can benefit from building additional flexibility regardless of their natural flexibility level.

Flexibility and Stretching

In this section, the speaker discusses the basic biological mechanisms of flexibility and stretching. The three major components involved in flexibility are neural, muscular, and connective tissue.

Mechanisms of Flexibility

Aspects of the nervous system, skeletal system, muscles, and connective tissue work together to restore a particular order or position to limbs.

There are two major mechanisms by which the nervous system communicates with muscles: 1) to prevent limbs from moving too far and causing injury; 2) to prevent overloading muscles with weight or tension.

There are protocols and tools that can be used to improve flexibility over time. Additionally, there are mechanisms that allow for significant increases in flexibility within just a few seconds.

Components of Flexibility

Flexibility involves three major components: neural (of the nervous system), muscular (muscles), and connective tissue (the stuff that surrounds neural and muscular tissue).

Fascial tissue is an interesting type of connective tissue that surrounds muscles, gives shape to the body, holds everything together, and allows for flexibility.

Nervous System Control

The nervous system controls muscles through motor neurons located in the spinal cord. These motor neurons send signals to muscles via neuromuscular junctions.

Acetylcholine is released from these neurons onto muscles at neuromuscular junctions causing them to contract.

Nerve and Muscle Control

In this section, the speaker explains how nerves control muscle contraction and describes the two types of neurons involved in muscle movement.

Nerve Connections in Muscles

Motor neurons control muscle contraction.

Sensory neurons exist in a different part of the spinal cord and send wires into muscles.

Spindle neurons wrap around muscle fibers to sense stretch within the muscles.

The Loop of Neural Connections

Sensory neurons send electrical signals to the spinal cord when a muscle is elongating due to increased range of motion.

Motor neurons contract muscles to bring limbs back into a safe range of motion.

This process is designed to keep your body together and safe by preventing excessive stretching or movement that could cause harm.

Determining Safe Range of Motion

The determination of whether a range of motion is safe or not is dictated by neural connections in the spinal cord and muscle as well as cognitive factors such as intentionality and perceived safety.

Basic safety mechanisms are also put in place to restrict limb range of motion.

Mechanisms for Stretch and Load Sensing

In this section, we learn about two mechanisms that help the body sense stretch and load. The first mechanism senses stretch and activates muscle contraction when stretch is excessive. The second mechanism senses loads and shuts down motor neurons to prevent muscles from contracting when loads are deemed excessive.

Stretch Sensing Mechanism

This mechanism senses stretch and can figure out when stretch is excessive.

When this system detects that stretch is excessive, it activates the contraction of muscles.

Load Sensing Mechanism

At the end of each muscle, there are tendons typically.

Golgi tendon organs (GTOs), which are sensory neurons closely associated with those tendons, sense how much load is on a given muscle.

These GTOs send signals into the spinal cord that shut down motor neuron's ability to contract muscle so that you no longer can lift that heavy load.

Both mechanisms are protective mechanisms but can be leveraged in a logical way to increase limb range of motion.

Importance of Stretching Practice

In this section, we learn about the importance of stretching practice in improving limb range of motion and offsetting the decrease in flexibility due to aging.

Benefits of Dedicated Stretching Practice

A dedicated stretching practice can improve limb range of motion.

Specific mechanisms explain how a dedicated stretching practice increases limb range of motion.

Longevity and Flexibility

We all undergo a decrease in limb range of motion unless we do something to offset that decrease.

From age 20 until about age 49, we start to experience a dramatic decrease in flexibility.

After age 49, the decrease continues at a rate of 10% every 10 years.

A regular practitioner of yoga or someone with a dedicated stretching practice can offset this decrease.

Introduction

The speaker introduces the topic of limb range of motion and how it can lead to injuries. They also mention that they will discuss ways to avoid such scenarios.

Mechanisms for Limb Range of Motion

The speaker explains that there are mechanisms within the spinal cord, muscles, and connective tissue that determine whether a limb stays within a particular range of motion or not.

They also mention that there are mechanisms from higher up in the nervous system, specifically from the brain, which play a role in determining whether a limb can handle a given load or tension.

Interoception and the Insula

The speaker introduces interoception as the ability to sense things in our internal world within our body.

They explain that the insula is the main brain area associated with interpreting what's going on in our body.

Examples of interoception include sensing the volume of food in your gut or feeling good or bad internally.

The front part of the insula is mainly concerned with external senses like smell and vision while the posterior insula is mainly concerned with somatic experience.

The posterior insula has von Economo neurons which seem uniquely enriched in humans and perform essential roles in regulating our physiology and emotional state.

Yum, Yuck, Meh

The speaker explains how our nervous system mainly batches information into yum (approach), yuck (avoid), or meh (neutral).

This applies to most stimuli whether they're internal or external senses.

Downsizing of Breeds

In this section, the speaker expresses mixed feelings about downsizing breeds and highlights that there are no teacup elephants, gorillas or chimpanzees.

Downsizing Breeds

The speaker has mixed feelings about downsizing breeds.

There are no teacup elephants, gorillas or chimpanzees.

Importance of von Economo Neurons

This section discusses the importance of von Economo neurons in integrating knowledge about body movements and discomfort to drive motivational processes.

von Economo Neurons

Humans have upwards of 80,000 von Economo neurons in our posterior insula while other species tend to have somewhere between 1,000 to 10,000.

These neurons integrate knowledge about body movements and discomfort to drive motivational processes that allow us to lean into discomfort and overcome it if we decide it is good for us or directed towards a specific goal.

These neurons are important when undertaking stretching practices as they help us make decisions on whether to relax through pain or push through it.

Safe Stretching Practices

This section explains how to gauge the decision on whether to relax through pain or push through it during stretching in a safe way.

Safe Stretching Practices

During stretching protocols, there is an opportunity to either override pain and discomfort by relaxing through it or pushing through it.

The decision on which fork in the road to take can be gauged safely using specific tools provided by the speaker that preserve the integrity of neural circuits described earlier.

von Economo neurons are connected to different brain areas that can shift our internal state from one of alertness and stress to relaxation, allowing us to gently override reflexes that would otherwise cause us to contract muscles back.

Upper Motor Neurons

This section discusses how upper motor neurons can direct and override lower motor neurons.

Upper Motor Neurons

The brain has upper motor neurons that can both direct and override lower motor neurons.

Reflexes and Decision Making

In this section, Dr. Rhonda Patrick explains how the nervous system works to retract a limb when stepping on a sharp object and how it is controlled by circuits in the spinal cord. She also discusses how von Economo neurons can override reflexes and allow humans to make decisions about what to do with their body.

Reflexive Response

The nervous system automatically retracts a limb when stepping on a sharp object.

Mechanisms are in place that cause the proper muscles to contract and other muscles to fully relax.

This happens reflexively without any thought or decision making.

Overriding Reflexes

Humans can override stretch reflexes by making decisions with upper motor neurons, insula, cognition, and von Economo neurons.

Von Economo neurons sit at an important junction within the brain that pays attention to what's going on in your body, including pain and pleasure.

They can control the amount of activation, alertness or calmness that you create within your body in response to sensory experiences.

Von Economo neurons seem to be uniquely enriched in humans and related to aspects of our evolution that allow us to make decisions about what to do with our body.

Practical Tool for Understanding Muscle Spindle Spinal Cord Circuit Mechanisms

In this section, Dr. Rhonda Patrick provides a practical tool for understanding muscle spindle spinal cord circuit mechanisms.

Range of Motion Test

Stand with legs straight and try touching toes while maintaining a flat back.

Get a sense of your range of motion for bending over at the waist while trying to touch toes or floor.

Quadriceps Contraction Test

Contract quadriceps as hard as possible for 5-15 seconds.

This test is not super controlled but provides insight into muscle spindle spinal cord circuit mechanisms.

Increasing Range of Motion with Spindle Stretch Mechanisms

In this section, the speaker explains how to increase range of motion by contracting antagonistic muscles. Specifically, he discusses how contracting the quadriceps can help to increase hamstring flexibility.

Contracting Antagonistic Muscles

To increase hamstring flexibility, contract your quadriceps as hard as you can for about 10 seconds.

If you don't experience an immediate increase in hamstring flexibility, try contracting your quadriceps harder and longer (20-30 seconds).

Tight hamstrings may be due in part to neural spindle reflexes. Contracting the opposite antagonistic muscle (quadriceps) can release this neural spindle reflex and increase range of motion.

How Spindle Stretch Mechanisms Work

Our muscles are organized such that we have muscles that are antagonistic to one another. The quadriceps and hamstrings work in a push-pull fashion.

When you contract your quadriceps hard, you are relaxing or releasing some of the stretch that's occurring in those intrafusal spindle sensory fibers going into your spinal cord.

This allows you to stretch your hamstrings further or increases range of motion about the hamstring and its related joints.

Leveraging Spindle Stretch Mechanisms for Other Muscles

You can use this approach for stretching other muscles as well. For instance, if you're doing a tricep stretch, try flexing your bicep while doing it to increase tricep range of motion.

Similarly, if you have tight quadriceps, contract your hamstring intensely for 10-30 seconds to increase range of motion.

The speaker acknowledges that there are other mechanisms at play, such as neural connections within the joints themselves, but this section focuses specifically on spindle stretch mechanisms.

Neural Activation and Muscle Flexibility

In this section, the speaker discusses how neural activation patterns can restrict muscle flexibility and how stretching can remove these restrictions. The speaker also explains the changes that occur in muscles with consistent stretching over time.

Neural Activation Patterns and Muscle Flexibility

Neural activation patterns can restrict muscle flexibility.

Stretching removes neural brakes, allowing for greater range of motion.

This concept applies to all muscle groups, not just larger ones like biceps and hamstrings.

Changes in Muscles with Consistent Stretching

Consistent stretching over several weeks or more leads to changes in muscles.

These changes involve alterations in the confirmation of elements within the muscles, such as sarcomeres and myosin/actin interactions.

While muscles do not actually lengthen with stretching, their resting state can become different from that of untrained muscles.

Neuromuscular Physiology and Muscle Flexibility

In this section, the speaker delves deeper into neuromuscular physiology and explains how sarcomeres work within muscle fibers. The speaker also clarifies misconceptions about muscle lengthening during stretching.

Sarcomeres Within Muscle Fibers

Sarcomeres are segments within muscle fibers that contain myosin and actin components.

Myosin and actin move relative to one another within sarcomeres to allow for muscle contraction.

McGill University studies suggest that consistent stretching may alter the size and spacing of sarcomeres.

Misconceptions About Muscle Lengthening

Muscles do not actually lengthen with stretching.

Rather, the resting state of a muscle can become different with consistent stretching over time.

Stretching and Range of Motion

The speaker discusses the cellular mechanisms behind stretching and how they relate to increasing flexibility and range of motion.

Mechanisms Behind Stretching

The spindle can prevent range of motion if the muscle is stretching too much or there is a sense of pain.

Changes in the confirmation of myosin and actin within sarcomeres can also affect range of motion.

Sensory information from neurons that innovate these areas is sent back to the spinal cord and brain for interpretation.

Adjustments for Increasing Range of Motion

Macro-level adjustments include determining how much movement to insert into stretching, such as static, dynamic, or ballistic stretches.

Micro-level adjustments include making slight sub-millimeter or millimeter increases in the stretching of a given muscle and related tissues.

Interleaving pushing and pulling exercises for antagonistic muscles during resistance training can improve performance without increasing total rest time between sets.

Push-Pull Exercise Technique

The speaker explains how interleaving pushing and pulling exercises during resistance training can improve performance without increasing total rest time between sets.

Push-Pull Exercise Technique

Interleaving pushing and pulling exercises for antagonistic muscles during resistance training can improve performance without increasing total rest time between sets.

Interleaving Push and Pull of Antagonistic Sets

In this section, the speaker discusses how interleaving push and pull of antagonistic sets can leverage some of the same neural circuits that increase flexibility. The speaker offers this as a tool to enhance performance overall while maintaining the same amount of rest.

Using Interleaving Push and Pull

Interleaving push and pull of antagonistic sets can leverage some of the same neural circuits that increase flexibility.

One challenge with using this tool is occupying multiple sites within the gym.

It takes a little bit of orchestrating in order to do properly.

This tool allows you to enhance performance overall while maintaining the same amount of rest.

Types of Stretching for Increasing Limb Range of Motion

In this section, the speaker discusses different types of stretching or methods for increasing limb range of motion. The four types are dynamic, ballistic, static, and PNF stretching.

Types of Stretching

Dynamic and ballistic stretching both involve movement but differ in momentum control.

Static stretching involves holding a stretch position without movement.

PNF (Proprioceptive Neuromuscular Facilitation) stretching leverages mechanisms that allow us to increase our flexibility safely.

Different modes or methods have different outcomes for a given effort.

Dynamic vs Ballistic Stretching

In this section, the speaker distinguishes between dynamic and ballistic stretching by focusing on momentum control.

Dynamic vs Ballistic Stretching

Dynamic stretching involves controlled movement with less momentum, especially towards the end range of motion.

Ballistic stretching involves more swinging of the limb or use of momentum, especially at the end range of motion.

Static and PNF Stretching

In this section, the speaker discusses static stretching and Proprioceptive Neuromuscular Facilitation (PNF) stretching. He explains that static stretching can be active or passive and involves eliminating momentum. PNF stretching leverages neural circuits to increase flexibility.

Types of Static Stretching

Static stretching can be subdivided into active or passive.

Active static stretching involves extending the range of motion by putting force behind the hold.

Passive static stretching involves relaxing into a further range of motion.

Proprioception in PNF Stretching

Proprioception involves understanding where our limbs are in space relative to our body.

PNF-type stretching leverages neural circuits through proprioceptive feedback from sensory neurons monitoring events within joints, connective tissue, muscles, spindle reflexes, and Golgi tendon organs.

Techniques for PNF Stretching

One technique for increasing hamstring flexibility is to lie on your back with a strap around your ankle and pull it towards you before progressively relaxing into it.

Other techniques include using loads, machines, or training partners to target specific muscle groups with dynamic, ballistic, static, or PNF stretches.

Conclusion

The speaker concludes by encouraging viewers to be safe when approaching these exercises and pay attention to protocols. He recommends finding exercises that allow targeting specific muscle groups safely.

Stretching Techniques for Increasing Range of Motion

In this section, the speaker discusses different stretching techniques and their effectiveness in increasing range of motion.

Static vs Dynamic Stretching

Static-type stretching is more effective than dynamic and ballistic stretching for increasing limb range of motion in the long-term.

Dynamic and ballistic stretching can be useful for improving performance but carry a certain amount of risk due to the use of momentum.

Physios recommend doing safe dynamic or ballistic stretching prior to resistance or cardiovascular training sessions to engage neural circuits and increase range of motion.

Best Route for Increasing Limb Range of Motion

Static stretching, including PNF, appears to be the best route for increasing limb range of motion in the long-term.

To reduce tightness and increase limb range of motion, static stretching should be done on specific muscle groups.

How Often and Where to Hold Static Stretches

The duration and frequency of static stretches are dependent on the desired change in flexibility.

A study showed that the change in flexibility is dependent on the duration and frequency of stretching.

The results suggest that scaling time spent on static stretches with limb range of motion is an effective way to increase flexibility.

Static Stretching Parameters

In this section, the speaker discusses the parameters for static stretching and how to improve limb range of motion.

Ideal Duration and Frequency of Static Stretches

Ideally, one should do static stretches that are held for 30 seconds.

Holding those stretches for more than 30 seconds did not turn out to be additionally useful.

The frequency of stretching can vary but doing it once a day is sufficient.

How to Perform Static Stretches

When performing a static stretch, remember not to use momentum.

Mental tricks like trying to push through the pain or relaxing into the stretch can be used.

Providing some force typically with a hand in order to pull your ankle back can help with quadricep stretches.

Number of Sets for Maximum Range of Motion Improvement

Doing at least 150 and ideally as much as 200 minutes per week of Zone 2 cardiovascular exercise is very useful for cardiovascular health.

For strength and hypertrophy building, approximately six sets per week per muscle group is recommended.

To maintain or improve range of motion, static stretching holds of 30 seconds appear to be best.

Determining Minimum Number of Sets

The minimum number of sets both to maintain and improve a given mode of performance varies between individuals depending on how hard they train.

For improving or maintaining range of motion, dedicated work through static stretching is necessary.

Effects of Stretching Duration on Range of Motion

This review article explores the effects of different stretching protocols on range of motion. The authors evaluated 23 studies and found that static stretching is the preferred mode for increasing limb range of motion.

Static Stretching vs Ballistic or PNF Protocols

All stretching typologies showed range of motion improvements over a long-term period.

Static protocols showed significant gains with a p-value less than .05 when compared to ballistic or PNF protocols.

Static stretching might even be superior to both ballistic and PNF protocols.

Time Spent Stretching

Time spent stretching per week seems fundamental to elicit range of movement improvements when stretches are applied for at least or more than five minutes per week.

Much of the improvements come from the short-term neural improvements that we talked about before, and also a stretch tolerance, a comfort with doing the movements and maybe even a comfort in overriding some of the pain mechanisms.

Frequency and Sets

We need to get at least five minutes per week of static stretching per muscle group divided into sets of 30 seconds each.

It does seem important that the frequency of stretching practice distributed throughout the week is important.

We should probably be doing anywhere from two to four sets of 30 second static holds stretches.

Effective Stretching Protocol

In this section, the speaker discusses how to construct a stretching program that is tailored to your specific goals. The speaker explains what an effective stretching protocol looks like and provides an example of how to improve hamstring flexibility.

Constructing an Effective Stretching Program

Understand the mechanisms and your particular goals before constructing a stretching program.

Tailor your stretching program based on your body's needs.

Rest between stretching sets is important but there is no research-backed information on the ideal duration of rest.

Example: Improving Hamstring Flexibility

To improve hamstring flexibility, do three sets of static stretching for 30 seconds each with some rest in between.

Warm up before doing stretches to avoid injury.

This section provides general guidelines for constructing an effective stretching program. It is important to tailor your program based on your individual needs and consult with a professional if necessary.

Stretching and Warm-up

In this section, the speaker discusses the importance of warming up before stretching and the benefits of doing static stretching after resistance or cardiovascular training.

Importance of Warming Up

Warming up is an ideal way to prepare the body for stretching.

It is important to warm up before stretching, but warm-ups don't have to be extensive.

Static Stretching After Exercise

Static stretching after resistance or cardiovascular training seems to be most beneficial.

There is controversy over whether static stretching prior to exercise can limit performance in running and resistance training.

Frequency and Duration of Stretching

Doing something five days a week may seem like a big commitment, but it's necessary for significant range of motion improvements.

Longer hold static stretches (up to 60 seconds) with fewer total sessions per week can also be effective.

Types of Stretching and Range of Motion Improvements

In this section, the speaker discusses different types of stretching and their effects on limb range of motion.

Types of Stretching

Active, passive, ballistic, PNF, and static stretching all improve limb range of motion.

Static stretching gives the greatest degree of gains in limb range of motion (20.9% increase on average).

Recommended Frequency for Significant Improvements

A minimum of five minutes per week is required to elicit a significant response with five days being the minimum weekly recommended frequency to achieve significant range

of motion improvements.

Importance of Limb Range of Motion

In this section, the speaker discusses the importance of limb range of motion and how it can benefit us in various ways.

Benefits of Limb Range of Motion

Good limb range of motion can offset age-related losses in flexibility and improve physical performance.

Maintaining good limb range of motion is important for reducing pain, improving posture, and better balance.

Limb range of motion is related to pain management and things related to headache.

PNF Stretching

PNF stretching leverages spindle mechanisms and GTO mechanisms to work.

Activation of GTOs is one reason why PNF stretching works.

Autogenic Inhibition

In this section, the speaker discusses autogenic inhibition and how it relates to interleaving sets in the gym.

Autogenic Inhibition Explained

Autogenic inhibition is a fancy name for contraction of one muscle group providing relaxation of the other muscle group that's antagonistic to it.

Interleaving push and pull exercises can allow you to achieve better results in a shorter period of time.

By going and doing a pulling exercise that involves the antagonistic muscle group, you're activating or near activating the GTO system in those pulling muscles in a way that provides autogenic inhibition for the pushing muscles.

Even sub-threshold activation of those intraspinal circuits can provide an additional replenishment of, say, the pushing muscles while you're activating those pulling muscles.

Constructing Range of Motion Increasing Programs

This section covers essential elements for building safe and effective range of motion increasing programs.

Building Safe and Effective Range of Motion Increasing Programs

Interleaving static stretching with PNF stretching can be useful for building range of motion increasing programs.

You can also interleave PNF-type protocols with resistance training to build ideal protocols.

The speaker will provide different protocols including pure static stretching, PNF-type stretching, and antagonistic interleaved muscle training. These protocols can be applied separately or combined in some way that's useful for your goals.

The Anderson Protocol and Pushing Through Pain

In this section, the speaker discusses the Anderson protocol and its relevance to peer-reviewed research on stretching. The focus is on pushing through pain and how active or passive one should be during static stretching.

Key Points:

When performing static stretches, it can be subjective how far one should reach or where the end range of motion is.

The Anderson method emphasizes stretching to the end of the range of motion but not focusing too much on where that range happens to be that day.

It's important to pay attention to the feel of the stretch and muscles involved when doing static stretching.

Feeling the muscles as you stretch them is crucial, don't just go through the motions.

Passive vs Active Stretching

This section focuses on passive versus active stretching and how much effort one should put into it.

Key Points:

Passive versus active stretching is a variable that has been mentioned a few times in this discussion.

There's also a subjective element to consider regarding how much effort one should put into their stretches.

Microstretching vs Moderate-intensity Static Stretching

In this section, the speaker discusses a study that compares low-intensity stretching (Microstretching) with moderate-intensity static stretching on active and passive ranges of motion.

Low-Intensity Stretching is More Effective

A six-week training program using very low-intensity stretching had a greater positive effect on lower limb range of motion than did moderate-intensity static stretching.

Very low intensity, meaning effort that feels not painful and in fact might even feel easy or at least not straining to exceed a given range of motion turns out to be more effective than moderate-intensity stretching.

Operating or performing stretching at an intensity that's quite low, that's very relaxing turns out to be more beneficial in increasing range of motion than is doing exercises aimed at increasing range of motion at a higher intensity.

Lower intensity static stretching appears to be the most beneficial way to approach stretching.

Intensity Levels

Microstretching was defined as low-intensity stretching while moderate intensity static stretching was defined as stretches completed at an intensity of 80% where 100% equals the point of pain.

The stretches for both groups were held for one minute each set.

Active Range vs Passive Range

The most interesting aspect of the study was the greater increase in active range of motion compared to passive range of motion by the Microstretching group.

Benefits and Injury Risk

Lower intensity static stretching appears to be more beneficial in increasing range of motion and has lower injury risk than pushing into the pain zone.

The authors offer a number of different explanations as to why this approach, this Microstretching approach, might be more effective.

Sympathetic and Parasympathetic Nervous System

In this section, the speaker discusses the arguments around sympathetic and parasympathetic nervous systems. He suggests not putting too much weight on their arguments about these systems.

Low-Intensity Microstretching

Low-intensity microstretching is the most effective way to increase limb range of movement over time.

Ballistic or Static Stretching

The data are split on whether doing any kind of stretching prior to running is going to lower running efficiency.

There are instances where an individual might want to do some static stretching to increase limb range of motion prior to doing weight training even if it's going to inhibit that person's ability to lift as much weight.

Doing some additional static stretching prior to cardiovascular, or weight training, or skill training, or sport of some kind is going to be useful because it's going to put us in a position of greater safety and confidence and performance overall.

Dynamic or Ballistic Stretching

Doing some dynamic or even ballistic stretching prior to skill training, or cardiovascular, or weight training can be beneficial in part to warm-up the relevant neural circuits, joints, connective tissue, and muscles.

Conclusion

In this section, the speaker concludes by mentioning Dr. Andy Galpin's work on hydration protocols.

Dr. Andy Galpin's Work on Hydration Protocols

Dr. Andy Galpin has named a couple of protocols after him particularly the Galpin equation for hydration which people could follow in order to ensure proper hydration during training.

Galpinian Logic and Stretching

In this section, Dr. Andrew Huberman discusses the benefits of stretching beyond increasing limb flexibility and range of motion. He introduces the concept of Galpinian logic and shares a study conducted by Dr. Helene Langevin on the effects of stretching on relaxation and tumor growth in mice.

Benefits of Stretching

Stretching can help us relax quickly and reduce inflammation.

Dr. Helene Langevin has conducted research on the mechanisms underlying acupuncture and stretching to understand what neural mechanisms get engaged when impinging on fascial tissues.

The National Institutes of Complementary Health and Medicine at the National Institutes of Health support systematic mechanistic exploration of respiration, meditation, yoga, acupuncture, etc.

Effects of Stretching on Tumor Growth in Mice

A study published in Scientific Reports showed that gentle daily stretching for 10 minutes can reduce local connective tissue inflammation and fibrosis as well as induce relaxation systemically.

Mice were randomized to a stretch versus no stretch condition for 10 minutes once a day for four weeks.

Tumor volume was reduced by almost half after three weeks into the stretching protocol compared to the no-stretch group.

This is a short transcript with limited content.

The Science of Stretching

In this video, Dr. Rhonda Patrick discusses the science behind stretching and its effects on the body. She covers topics such as fascia, inflammation, immune system response, and brain structure volume.

Stretching and Tumor Growth

Stretching for 10 minutes a day may impact the fascia to create microenvironments that are more permissive for tumor growth.

Stretching does not directly reduce tumor size but can affect certain pathways related to the immune system that would allow it to combat tumor growth.

Relaxation induced by stretching can have a powerful influence on mammary tumor growth.

Insular Cortex and Pain Tolerance

The insular cortex is responsible for handling pain tolerance in our brains.

A study published in Cerebral Cortex found that yoga practitioners had double or more pain tolerance than non-practitioners.

Yoga practitioners also had significant increases in insula gray matter volume compared to non-practitioners.

Brain Structure Volume and Yoga Practice

A study explored the effects of yoga practice on brain structure volume in yoga practitioners from different backgrounds.

Pain tolerance was significantly greater in yoga practitioners than non-practitioners even for those who did not practice hot yoga.

Significant increases were found in insula gray matter volume among yoga practitioners.

Yoga and Pain Tolerance

In this section, the speaker discusses how yoga practice can increase gray matter volume in brain regions associated with interoceptive awareness and pain tolerance. The study shows that practitioners of yoga are better able to cope with pain and discomfort by controlling their nervous system through subjective approaches like positive imagery, relaxation, acceptance, observation, and breathing.

Yoga Practice Increases Gray Matter Volume

Gray matter volume of a particular brain region scales almost linearly with the duration of yoga practice.

Practitioners of yoga who had up to 15 or 16 years of yoga practice had much larger left insula gray matter volume.

Yoga practitioners build up the structure and function of these brain areas that allow them to cope with pain better than other individuals.

Overcoming Discomfort Through Yogic Movements

It's not just the performance of yogic movements but also pushing into the end ranges of motion and pushing through discomfort that allows yoga practitioners to build up these brain areas.

Practitioners learn how to control their nervous system in ways that reshape their relationship to pain, flexibility, and neuromuscular system function.

Subjective Approaches Used by Yogis for Pain Tolerance

Practitioners tend to use subjective approaches like positive imagery, relaxation despite extreme cold, acceptance despite extreme cold, observation, and breathing.

Control subjects tended to use distraction or negative emotion strategies.

Practitioners have higher pain tolerance as evidenced by data in previous graphs in the paper.

Increasing Limb Range of Motion

In this section, Dr. Andrew Huberman discusses the benefits of yoga and other practices that can increase limb range of motion and flexibility.

Yoga as a Useful Practice

Practicing yoga can increase flexibility and limb range of motion.

Yoga can also improve mental functioning related to pain tolerance and stress management.

A future study may show that long-term yoga practitioners have larger insulas, leading to better internal awareness, pain thresholds, and stress management.

Ways to Increase Limb Range of Motion

Static stretching is among the more useful forms of stretching.

Low or zero momentum stretching at end range of motion is effective.

Microstretching with low-intensity static stretch holds (30-40% threshold) appears to be more effective than high-intensity holds (80% threshold).

At least five minutes per week total of stretching for a given muscle group is important for creating meaningful, lasting changes in limb range of motion.

Stretching Protocols

Five-day-a-week, six-day-a-week, or even seven-day-a-week protocols are best for increasing limb range of motion.

Short protocols limited to three sets of 30 seconds with 45 or 60 seconds of static hold are effective.

Warming up before stretching sessions is essential.

Other Forms of Stretching

PNF (proprioceptive neuromuscular facilitation), dynamic, and ballistic stretching are also effective ways to increase limb range of motion.

Dynamic and ballistic stretching involve using momentum to improve range of motion for physical work.

Future Episode Topic: Cognitive Abilities

Dr. Huberman suggests that changing limb range of motion and different types of body movement may shape cognitive abilities. This will be the topic in a future episode.

Supporting the Podcast

In this section, Dr. Andrew Huberman discusses ways to support the podcast and provides information about supplements.

Supporting the Podcast

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