How is stretching different from lifting weights for hypertrophy?

Both stretching and lifting weights can induce mechanical tension, a key driver of hypertrophy. However, extreme stretching protocols may engage different mechanosensors and cellular processes than traditional resistance training.

Does stretching build more muscle than lifting weights?

Based on current data, stretching does not appear to build more muscle than lifting weights, and it is often less time-efficient. However, it can be a complementary stimulus.

What are the requirements for stretching to cause muscle growth?

Stretching requires high intensity (8/10 discomfort), significant duration (e.g., 1 hour daily or 15-30 minutes multiple times a week), and sufficient frequency. Maintaining stretch tolerance is key.

Who should consider using extreme stretching for hypertrophy?

Competitive bodybuilders or individuals dedicated to maximizing muscle growth and willing to endure discomfort might benefit. For general fitness, it's likely not the best use of time.

When is the best time to do intense stretching for muscle growth?

Intense stretching should be performed post-workout, at night, or on rest days. Avoid doing it immediately before training, as it can negatively impact strength and power performance.

What are some practical examples of stretches for hypertrophy?

Recommended stretches include the sit-and-reach for hamstrings, straight-leg dorsiflexion for calves, and a 90-degree door stretch for the pecs, all held at high intensity for at least 15 minutes.

Key Moments

Does Stretching Build Muscle? (ft. Dr. Eric Helms)

Stronger By Science

Sports3 min read30 min video

Jul 19, 2024|20,155 views|928|97

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Key Moments

TL;DR

Stretching can build muscle if intense, prolonged, and frequent, but it's time-inefficient compared to lifting.

Key Insights

Stretching can induce muscle hypertrophy, but requires high intensity, duration, and frequency, unlike most traditional stretching protocols.

Animal studies show significant muscle growth from extreme stretching, but human data is more nuanced, with recent studies showing comparable gains to resistance training under specific conditions.

While resistance training also increases range of motion, dedicated stretching protocols generally yield greater improvements in flexibility.

Extreme stretching is significantly more time-consuming and uncomfortable than resistance training for comparable hypertrophy results.

Mechanisms for stretch-induced hypertrophy are complex and not fully understood, possibly involving different mechanosensing pathways than simple resistance training.

Stretching is best performed post-workout or on off-days to avoid negatively impacting strength and power performance.

STRETCHING'S POTENTIAL FOR MUSCLE GROWTH

While historically viewed as separate from muscle building, recent research, particularly Dr. Eric Helms' deep dive into the data, suggests that stretching can indeed lead to muscle hypertrophy. This potential is supported by extensive animal studies showing significant muscle growth, even hyperplasia, under extreme stretching conditions. However, translating this to humans required understanding that the stretching protocols needed to be high in intensity, duration, and frequency, moving beyond the short, low-intensity stretches commonly practiced.

DEFINING AND COMPARING STRETCHING AND LIFTING

Stretching aims to increase the distance between a muscle's origin and insertion, pushing the muscle-tendon unit to its physiological end range and holding it there. This differs from resistance training, which also involves movement through a range of motion, but with the primary stimulus being mechanical tension generated by lifting weights. While both can improve joint range of motion, purposeful stretching protocols often lead to greater increases in flexibility compared to resistance training alone.

HUMAN STUDIES ON EXTREME STRETCHING AND HYPERTROPHY

Direct comparisons between extreme stretching and resistance training in humans have yielded intriguing results. Studies on calf muscles and pectorals found that prolonged, high-intensity stretching protocols (e.g., one hour daily or 15 minutes four times weekly at maximal tolerance) produced similar muscle thickness and strength gains to standard resistance training routines (e.g., 45 minutes weekly). This suggests that, under specific intense conditions, stretching can be a viable, albeit less time-efficient, stimulus for hypertrophy.

CONTROVERSIES AND MECHANISMS OF STRETCH-INDUCED HYPERTROPHY

The proposed mechanisms for stretch-induced hypertrophy are multifaceted and still being uncovered. While some argue it hinges solely on mechanical tension, similar to resistance training, research suggests distinct pathways might be involved. These could include the response of mechanosensors like titin and integrins, nuclear flattening, and changes in membrane channels. Furthermore, the occlusion effect observed during prolonged stretches may mimic aspects of blood flow restriction training, potentially contributing to overall growth.

INDIVIDUAL FACTORS AND PRACTICAL APPLICATION

While stretching can stimulate hypertrophy, benefits may vary. Initial observations suggest that individuals with lower baseline flexibility might experience greater gains, as they can achieve higher tension levels during stretching. For practical application, extreme stretching protocols are not recommended for most individuals due to their time commitment, discomfort, and potential injury risk. They are best suited for highly dedicated bodybuilders or as a supplementary tool during travel or periods of limited gym access.

OPTIMAL APPLICATION AND TIMING OF STRETCHING

To maximize benefits and minimize risks, extreme stretching should ideally be performed on off-days or post-workout, avoiding sessions immediately before training to prevent acute decreases in strength and power. For those interested in incorporating it, starting with shorter durations (15-20 minutes, 1-2 times per week) and gradually increasing intensity and frequency is advised. While specific protocols exist, prioritizing safety and listening to one's body is crucial, as pushing too hard too soon can lead to injury.

REMAINING QUESTIONS AND FUTURE DIRECTIONS

Despite promising findings, several questions about stretch-mediated hypertrophy remain. It is unclear if all muscle groups respond equally, and the exact interplay between stretching, resistance training, and muscle adaptation continues to be an area of active research. While some studies examine inter-set stretching, its premature application might negatively impact subsequent training performance. Overall, while stretching offers a novel stimulus with potential for hypertrophy, it remains a less efficient and more demanding method compared to traditional resistance training for the general population.

Mentioned in This Episode

●Products

●Tools

●Organizations

●Books

●Studies Cited

●Concepts

●People Referenced

Stretching for Hypertrophy: Dos and Don'ts

Practical takeaways from this episode

Do This

Perform extreme stretching protocols for hypertrophy at least post-workout, at night, or on off days.

Start with 1-2 sessions per week of 15-20 minutes and gradually build up.

Aim for an 8/10 perceived stretch discomfort, holding for 15-30 minutes per session, 1-4 times per week.

Consider stretching as a complementary tool, especially for harder-to-train muscle groups or when gym access is limited.

For competitive bodybuilders, experiment with extreme protocols but be aware of pain and potential injury risk.

Ensure adequate recovery and avoid stretching immediately before intense training if it's high-intensity.

Avoid This

Do not perform intense stretching immediately before resistance training, as it can negatively impact strength and power.

Avoid pushing through extreme pain; gradually build up tolerance.

Do not expect significant hypertrophy gains from short, low-intensity stretching sessions.

For most individuals, extreme stretching protocols are not a good return on investment due to discomfort and time commitment.

Do not dismiss the potential benefits of stretching for hypertrophy due to skepticism about mechanisms.

Common Questions

Yes, stretching can build muscle (hypertrophy) if specific criteria are met, including high intensity, duration, and frequency. Previous research was limited by short or low-intensity protocols.

Topics

Mechanical Tension Sarcomere Mechanotransduction Calves Pectorals Hamstrings Timeless

Mentioned in this video

Concepts

Titin

A mechanosensor in muscle that unfolds during eccentric contractions and may be stimulated by stretching.

Length-bias training

Resistance training that emphasizes the lengthened portion of the range of motion.

Sit and reach hamstring stretch

A common stretch recommended for hamstrings.

Straight leg dorsiflexion calf stretch

A recommended calf stretch, often performed against a wall or on steps.

Stretch-Mediated Hypertrophy

The process by which stretching, under specific conditions, can lead to muscle growth.

Morphological adaptations

Changes in the structure or form of muscle tissue, which can occur with extreme stretching protocols.

90-degree angle door stretch for pecs

A stretch performed in a door jam to target the pectoral muscles.

Stretch tolerance

The ability to become more comfortable with discomfort, leading to increased range of motion.

Full range of motion training

Resistance training that utilizes the complete functional range for a given joint and movement.

Blood Flow Restriction Training (BFR)

A training method that involves partially occluding blood flow, which may have overlapping effects with extreme stretching due to occlusion.

Nuclear Flattening

The flattening of nuclei within muscle fibers, which may produce an anabolic response and occurs during muscle stretching.

Hyperplasia

An increase in the number of muscle fibers, observed in animal models with extreme stretching but difficult to prove in humans.

Muscle tendon unit length

The overall length of the muscle and its associated tendons, which can be increased through stretching.

Mechanical tension

The force applied to muscle fibers, recognized as a primary driver of hypertrophy, whether from lifting or stretching.

Cross-sectional area

A measure of muscle size, which can increase due to hypertrophy.

Sarcomere and series compliance

Components within muscle fibers that can adapt to stretching and resistance training.

Studies & Research

Dr. Helms's personal case study

A case study where Dr. Helms used a calf stretching boot for 2 hours daily, 6 days a week, on top of his training, observing preliminary significant increases in muscle thickness.

Waran's study on calves

Compared calf raises (45 mins/week) with daily 1-hour calf stretching using an orthotic device, finding similar changes in muscle thickness and strength.

Wolen's study on pecs

Used a self-ratcheting device for 15 minutes, four times a week, to achieve maximal pec stretch, finding similar hypertrophy to resistance training.

People

Bryce Lewis

Coached by Dr. Helms at the 2017 World Championships, during which Dr. Helms experienced a hip injury.

Wolen and colleagues

Researchers who developed a self-ratcheting stretching device for the pecs and compared it to resistance training.

Products

Self-Ratcheting Pec Stretching Device

A device used in a study to continuously hold the pecs in a maximally stretched position.

Calf Stretching Boot

An orthotic device used in studies to maintain a near-maximal stretch in the calves for an hour a day.

BFR (Blood Flow Restriction) wraps

Portable tools recommended for use when traveling or lacking gym access, potentially useful for stretching.

Books

Muscle and Strength Pyramid

A resource linked from 3DM Muscle Journey providing information on muscle and strength.

Organizations

MASS Research Review

A monthly publication covering the latest data in muscle and strength research, with multiple articles on stretch-mediated hypertrophy.

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