What Is the Repeated-Bout Effect? Why the Same Workout Makes You Less Sore Next Time

The repeated-bout effect is the protective adaptation that occurs after an initial exposure to unfamiliar or muscle-damaging exercise—particularly exercise involving eccentric muscle contractions. When a similar exercise is performed again, the second bout typically produces less muscle soreness, less disruption in markers associated with exercise-induced muscle damage, and faster recovery of physical function.

In other words, your body learns from the first exposure.

That is why your first session of squats after months away from the gym may make stairs uncomfortable for several days, while the same session performed again later may produce far less soreness.

A 2023 systematic review and meta-analysis examining 20 studies of multiarticular exercise found greater delayed-onset muscle soreness and creatine kinase after the first bout than the second at both 24 and 48 hours. Muscle strength and vertical-jump performance were also better preserved following the repeated bout.

The repeated-bout effect does not mean the second workout stopped working.

It means the body adapted to tolerate that particular stress more effectively.

Key Takeaways

• The repeated-bout effect, or RBE, describes the reduced response to exercise-induced muscle damage after a prior similar exercise exposure.
• It is especially associated with eccentric contractions, where a muscle produces force while lengthening.
• The second exposure commonly produces less DOMS, lower elevations in creatine kinase, less loss of strength, and better preservation of performance than the first.
• The effect can begin after a single exposure.
• The first exposure does not always have to be maximal to provide protection. Studies have demonstrated protective effects after lower-intensity or reduced-volume eccentric exercise.
• The mechanism is probably not one single adaptation. Neural, mechanical, extracellular-matrix, cellular, and inflammatory changes all appear to contribute.
• The protection is partly specific to the exercise and muscles used, although research has also demonstrated some transfer to the opposite limb, suggesting a neural component.
• Less soreness does not mean the workout is no longer productive.
• More soreness does not automatically mean more muscle growth or a better workout.
• Recovery products may help with comfort or other specific needs, but they do not replace the training adaptation responsible for the repeated-bout effect.

Table of Contents

• What is the repeated-bout effect?
• Why does a new workout make you so sore?
• Why is eccentric exercise especially important?
• What changes the second time you perform the workout?
• Does the repeated-bout effect mean your muscles are no longer challenged?
• What causes the repeated-bout effect?
• How quickly does the repeated-bout effect develop?
• How long does the protection last?
• Does the first workout have to be hard?
• Is the repeated-bout effect specific to one exercise?
• Does it happen with real-world training?
• Can runners experience the repeated-bout effect?
• Does less soreness mean less muscle growth?
• Should you deliberately make yourself sore?
• How can beginners use the repeated-bout effect?
• What happens after a long training break?
• Where do recovery products fit?
• Frequently asked questions

What Is the Repeated-Bout Effect?

The repeated-bout effect is a physiological adaptation in which one exposure to unfamiliar or damaging exercise makes the body more resistant to many of the disruptive effects of a similar exercise bout performed later.

Researchers have documented this phenomenon for decades, particularly following eccentric exercise. Classic work describes a first unfamiliar eccentric bout producing soreness, loss of strength, swelling, elevated muscle enzymes and other markers, followed by substantially attenuated responses when the exercise is repeated.

That is the scientific explanation for a common training experience:

You perform an unfamiliar workout.

The next day you feel fine.

Then 24 to 48 hours later, getting out of a chair suddenly feels much more difficult than expected.

You repeat similar training later.

This time, you recover much more comfortably.

The exercise may still be difficult.

The muscles may still be challenged.

But the post-exercise disruption is reduced.

That is the repeated-bout effect.

Why Does a New Workout Make You So Sore?

Unfamiliar exercise exposes muscle and supporting tissues to stresses they are not yet accustomed to managing.

This is particularly evident when the exercise contains a large eccentric component.

Examples include:

• Lowering a weight slowly
• Walking or running downhill
• Descending stairs
• Lowering into a squat
• Lowering a dumbbell during a curl
• Landing from jumps
• Decelerating during sport
• Returning to resistance training after a long layoff

Exercise-induced muscle damage is not defined by soreness alone. Researchers commonly evaluate a combination of indirect markers, including:

• Delayed-onset muscle soreness
• Temporary strength loss
• Reduced range of motion
• Swelling
• Blood markers such as creatine kinase
• Changes in physical performance

The magnitude of these responses varies substantially among people and depends on the exercise performed.

That means two people can complete the same session and have very different experiences the following day.

Why Is Eccentric Exercise Especially Important?

An eccentric contraction occurs when a muscle produces force while lengthening.

Think about the quadriceps while walking downhill.

Gravity is pulling your body downward, but your quadriceps are actively controlling the descent.

Or consider lowering a barbell during a biceps curl.

The elbow flexors remain active while lengthening.

Eccentric exercise can produce substantial force with comparatively different energetic demands from concentric muscle actions, but unfamiliar eccentric loading is also strongly associated with exercise-induced muscle damage and subsequent DOMS.

This is why downhill running is such a useful real-world example.

Someone may be aerobically fit enough to run comfortably for an hour on flat terrain yet become unusually sore after a downhill-heavy route because the mechanical demands are unfamiliar.

The cardiovascular fitness was there.

The eccentric conditioning was not.

An eccentric contraction occurs when a muscle produces force while lengthening—such as the biceps controlling the descent of a dumbbell.

What Changes the Second Time You Perform the Workout?

This is where the repeated-bout effect becomes obvious.

A 2023 systematic review and meta-analysis evaluated 20 studies involving multiarticular muscle-damaging exercise. The researchers compared responses 24 and 48 hours after the first and second bouts.

They found that after the first bout:

• DOMS was significantly greater.
• Creatine kinase was significantly greater.
• Muscular strength was more impaired.
• Vertical-jump performance was more impaired.
• Oxygen consumption and perceived exertion during running-economy protocols were greater.

The second bout produced a more protected response.

First Bout vs. Repeated Bout

This does not mean every marker improves identically in every study.

It means the overall phenomenon is robust enough to appear across different experimental models and common multi-joint exercise protocols.

A Human Study Shows How Dramatic the Difference Can Be

A study comparing two eccentric exercise bouts of the knee extensors found that after the second bout:

• Muscle soreness was 42% lower
• Creatine kinase activity was 62% lower
• Strength loss was 54% lower

than after the first bout.

The exact percentages should not be treated as universal predictions.

Your results will depend on the exercise, loading, training status, timing, genetics, recovery and other factors.

But the study illustrates the basic phenomenon clearly:

The muscle reacts differently after it has encountered the stress before.

Does the Repeated-Bout Effect Mean Your Muscles Are No Longer Challenged?

No.

This is one of the most important practical lessons.

People sometimes interpret decreasing soreness like this:

"I was sore for three days after the first workout. Now I barely feel sore. The workout must not be working anymore."

That conclusion does not follow.

The repeated-bout effect specifically shows that soreness and other signs associated with exercise-induced muscle damage can decrease because the tissue adapted.

You can therefore perform productive training without experiencing severe DOMS after every workout.

In fact, being able to tolerate training with less disruption can be advantageous.

If every workout leaves you unable to perform normally for several days, it becomes difficult to accumulate consistent, high-quality training.

Adaptation is the objective.

Repeatedly recreating the maximum possible soreness is not.

What Causes the Repeated-Bout Effect?

There is no single universally accepted mechanism.

Research over several decades has instead pointed toward multiple overlapping adaptations.

A recent 2024 review describes the repeated-bout effect as an intrinsic protective adaptation involving changes that may include neural adaptation, tendon and muscle-fiber properties, extracellular-matrix remodeling and altered inflammatory responses.

The mechanisms are commonly grouped into several categories.

1. Neural Adaptations

Your nervous system may change how force is distributed across muscle fibers after the first exposure.

A particularly interesting clue comes from research showing a contralateral repeated-bout effect.

In one randomized human trial, participants performed eccentric exercise and later repeated the exercise either with the same arm or the opposite arm. Some protection transferred to the opposite limb, including an attenuation in strength loss. The authors interpreted associated electromyographic findings as evidence for a centrally mediated neural adaptation.

A purely local structural adaptation would have difficulty explaining protection in an arm that did not perform the original exercise.

That suggests the nervous system is part of the story.

2. Mechanical and Structural Adaptations

Muscle fibers and their surrounding structural framework may become more resistant to subsequent mechanical stress.

Researchers have investigated changes involving:

• Muscle-tendon behavior
• Sarcomere mechanics
• Cytoskeletal structures
• Extracellular matrix
• Membrane-associated proteins

Experimental work has shown that repeated eccentric contractions can increase proteins associated with muscle-cell membranes and structural junctions, with those changes correlating with better preservation of torque after subsequent eccentric injury.

The muscle is therefore not simply "numbing itself" to soreness.

Its physical resilience may actually change.

3. Cellular Adaptations

The first bout can trigger cellular responses that make later exposure easier to tolerate.

Recent research increasingly frames this as a form of skeletal-muscle cellular memory: the initial stress produces adaptive changes that alter how the tissue responds when the challenge returns.

This concept fits a broader principle of exercise physiology:

A stressor that is appropriately tolerated can create an adaptation that improves resistance to the same stressor later.

4. Inflammatory and Immune Adaptations

Exercise-induced muscle damage produces an inflammatory response involving immune-cell activity and tissue remodeling.

Repeated exposure appears to alter aspects of this response, although the biology is more complicated than simply saying "less inflammation." Some experiments have found that particular inflammatory-cell responses remain active or may even be enhanced despite reduced functional disruption after the repeated bout.

That is another reason overly simple explanations should be avoided.

The body is not merely shutting inflammation off.

It is adapting how it responds to the stress.

How Quickly Does the Repeated-Bout Effect Develop?

Remarkably, one prior exposure can be enough to provide meaningful protection.

Classic studies have shown substantial attenuation of exercise-induced muscle damage when a similar eccentric bout is repeated days or weeks later.

And the first exposure does not necessarily need to contain a huge amount of exercise.

One study compared first bouts consisting of only 2, 6 or 24 maximal eccentric actions of the elbow flexors. Two weeks later, participants performed 24 maximal eccentric actions. Even the reduced-volume initial exposures provided protection against the subsequent bout, although the magnitude of protection depended on the first exposure.

That finding has practical value.

You may not need to destroy yourself in the first week of a new program to prepare for harder training later.

Does the First Workout Have to Be Maximal?

No.

Research comparing initial eccentric exercise performed at 40%, 60%, 80% and 100% of maximal isometric strength found that all intensity groups showed a repeated-bout effect when they later performed maximal eccentric exercise, although protection was greater following the higher initial intensities.

This reinforces a useful programming concept:

A gradual introduction to unfamiliar exercise can still create adaptation.

Suppose you are adding downhill running before a trail race.

You do not necessarily need your first downhill session to be the longest, steepest descent you can tolerate.

Or suppose you are returning to squats after three months away.

There may be little advantage in using your previous training volume during your very first session back.

A measured first exposure can begin the adaptation process while reducing unnecessary disruption.

How Long Does the Protection Last?

The protective effect can persist for weeks, but its magnitude generally depends on the time between exercise bouts and the similarity of the repeated exercise. Classic studies have demonstrated protection across intervals of several weeks, while research examining longer intervals suggests that the effect gradually declines as time passes.

There is no single expiration date.

The repeated-bout effect is influenced by:

• Exercise type
• Muscle group
• Intensity
• Volume
• Range of motion
• Training experience
• Time between exposures

In practical terms, regularly performed movements tend to remain familiar.

After a long enough break, however, a previously familiar exercise may once again produce substantial soreness.

That is why the first workout after an offseason, illness, injury layoff or extended vacation can be surprisingly uncomfortable.

Is the Repeated-Bout Effect Specific to One Exercise?

Partly.

The greatest protection generally occurs when the repeated exercise resembles the original stressor.

That makes sense.

Your body adapts to what you expose it to.

Training downhill running does not necessarily prepare every muscle equally for an unfamiliar heavy deadlift session.

But the adaptation is not perfectly isolated either.

Research demonstrating a contralateral repeated-bout effect shows that part of the protection can transfer to the opposite limb.

So the effect appears to include both:

Local adaptations within the exercised tissue

and

System-level adaptations involving the nervous system and potentially other signaling processes.

Does the Repeated-Bout Effect Happen With Normal Gym Exercises?

Yes.

This is not merely a laboratory phenomenon involving specialized eccentric machines.

The 2023 systematic review and meta-analysis specifically examined multiarticular exercises and concluded that commonly performed exercises involving eccentric contractions exhibited a repeated-bout effect.

A 2024 study also examined cyclists who were relatively unfamiliar with resistance training. After traditional resistance-training bouts, DOMS was lower after the second bout, and the researchers observed indications of improved cycling efficiency associated with the repeated exposure.

That makes the concept highly relevant when:

• Adding strength training to endurance programs
• Starting a new gym routine
• Returning from an offseason
• Introducing new exercises
• Changing range of motion
• Adding eccentric emphasis
• Increasing downhill running
• Beginning plyometric training

Can Runners Experience the Repeated-Bout Effect?

Absolutely.

Downhill running is one of the clearest endurance examples because it contains substantial eccentric loading of the lower extremities.

A 2024 study examined trained female distance runners who were unfamiliar with downhill running. They completed level and downhill running trials on two occasions separated by three weeks.

During the second bout, soreness in the gastrocnemius, quadriceps and hamstrings was attenuated, and gluteal soreness was lower at several post-exercise time points.

These athletes were already trained runners.

But they were unfamiliar with that particular downhill stress.

That distinction is important.

Fitness is specific.

Being highly conditioned does not make every novel mechanical stress familiar.

A trained cyclist can still become sore from squats.

A strength athlete can still become sore from downhill running.

A runner can still become sore after an unfamiliar resistance-training exercise.

The repeated-bout effect develops in response to the stress you actually perform.

Does Less Soreness Mean Less Muscle Growth?

No.

DOMS is not a requirement for productive training.

The repeated-bout effect itself demonstrates why soreness is a poor standalone measure of workout quality: the same or similar exercise can produce far less soreness after adaptation, even though the muscle is still performing meaningful work.

It is more useful to evaluate a training program using variables such as:

• Strength progression
• Repetition performance
• Training volume
• Load progression
• Technique
• Sport performance
• Recovery
• Long-term consistency

Soreness is information.

It is not a score.

Should You Deliberately Try to Make Yourself Sore?

Generally, no.

Soreness can happen as a normal consequence of unfamiliar training, but maximizing soreness is not the objective of a well-designed program.

Excessive post-exercise disruption can interfere with subsequent training quality.

If strength, movement or athletic performance remains substantially impaired because of the previous session, the next session may be harder to execute effectively. The 2023 meta-analysis found that the first muscle-damaging bout produced greater impairment in strength and vertical-jump performance than the repeated bout.

The better long-term target is usually:

Apply enough stress to stimulate adaptation while preserving the ability to train consistently.

The Repeated-Bout Effect Is One Reason Consistency Matters

People often think consistency is valuable only because workouts accumulate over time.

There is another benefit.

Consistency makes the training stress familiar.

Your body becomes better prepared for the demands you repeatedly place on it.

This can mean:

• Less disruptive soreness
• Better preservation of strength
• Greater tolerance for training volume
• More predictable recovery
• Better ability to schedule subsequent sessions

That does not eliminate fatigue.

It makes the response to training more manageable.

How Beginners Can Use the Repeated-Bout Effect

The repeated-bout effect supports a simple strategy:

Introduce unfamiliar exercise progressively.

Instead of asking:

"How much training can I survive today?"

ask:

"What amount of training will prepare me to train well again?"

For someone starting resistance training, that could mean beginning with fewer sets than they will eventually perform.

For a runner adding hills, it could mean introducing downhill exposure gradually.

For someone returning after several months off, it may mean resisting the urge to resume exactly where they stopped.

Research showing protection from reduced-volume and lower-intensity first bouts provides physiological support for this approach.

Example progression

Week 1:

Introduce the unfamiliar movement conservatively.

Week 2:

Repeat the movement with modest additional volume or load if recovery was appropriate.

Week 3:

Progress toward normal training demands.

The exact progression should depend on the person and activity.

The principle is what matters:

Exposure creates adaptation.

Why the First Workout Back Can Feel So Different

Imagine that you used to train legs twice a week.

Squats rarely made you sore.

Then you stop resistance training for several months.

Your cardiovascular fitness may remain reasonable.

Your memories of your old weights remain intact.

But your tissues are no longer receiving the same repeated mechanical exposure.

You return and perform the exact workout you used to tolerate.

Two days later, the soreness feels completely out of proportion.

That does not necessarily mean the workout suddenly became inherently more damaging.

It means your recent training history changed.

The repeated-bout effect is partly dependent on previous exposure, and protection can diminish as the interval between bouts increases.

This is why "muscle memory" should not be interpreted as permission to skip reacclimation.

Your strength may return relatively quickly.

Your tolerance for unfamiliar training stress still deserves progression.

Can You Create Protection Without Getting Extremely Sore First?

Research suggests you can.

This may be one of the most useful practical implications of repeated-bout research.

In the reduced-volume study discussed earlier, even an initial exposure of only a few eccentric contractions provided protection against a larger later bout.

In another study, lower-intensity eccentric exercise at 40% or 60% of maximal strength produced less disruption during the initial exposure while still providing measurable protection against a later maximal bout.

So the choice is not necessarily:

Severe soreness now or no adaptation later.

A more intelligent strategy may be:

Controlled exposure now → greater tolerance later.

Does the Repeated-Bout Effect Prevent All Muscle Soreness?

No.

The repeated-bout effect reduces susceptibility; it does not make someone immune to DOMS.

You may still become sore when you:

• Dramatically increase training volume
• Increase load
• Use a longer range of motion
• Introduce a new exercise
• Emphasize eccentric contractions
• Train a previously neglected muscle group
• Return after a long break
• Perform an unusually long downhill run
• Add unfamiliar sprinting or jumping

The repeated-bout effect is specific enough that changing the nature of the stress can create a new challenge.

Soreness, Muscle Damage and Pain Are Not the Same Thing

Another important distinction:

Soreness is a subjective sensation.

Exercise-induced muscle damage is a physiological phenomenon assessed indirectly through multiple markers.

Pain can have many causes unrelated to normal DOMS.

The repeated-bout effect can reduce soreness and markers associated with muscle damage, but soreness alone cannot tell you exactly what has happened inside a muscle.

Normal DOMS also should not be used to explain every post-exercise symptom.

Sharp pain, major swelling, substantial weakness, loss of normal function, symptoms after an acute injury, or symptoms that worsen rather than improve deserve a different level of attention.

Where Do Recovery Products Fit?

The repeated-bout effect is fundamentally a training adaptation.

A topical product does not replace it.

Your muscles become more resistant to familiar exercise because of previous exposure and the adaptations that follow.

That said, people may still want temporary relief from minor muscle or joint aches while maintaining an active routine.

LactiGo's current U.S. Drug Facts label identifies:

• Menthol 1.25% as the active ingredient
• Topical analgesic as its labeled purpose
• Temporary relief of minor aches and pains of muscles and joints as its labeled use

The same label lists L-carnosine and magnesium sulfate among the inactive ingredients.

That creates an appropriate distinction:

Training creates the repeated-bout effect.

A labeled topical analgesic may provide temporary relief of minor aches.

These are not the same function.

And they should not be marketed as though they are.

Where LactiGo May Fit Into an Active Recovery Routine

Suppose you have introduced a new exercise and are experiencing ordinary post-activity muscle aches.

Your recovery priorities still begin with fundamentals:

• Appropriate training progression
• Adequate sleep
• Nutrition
• Hydration
• Sufficient time between demanding sessions
• Movement appropriate to your recovery status

If you also want topical temporary relief from minor muscle or joint aches, LactiGo with menthol is labeled for that purpose.

LactiGo does not create the repeated-bout effect.

Your training exposure does.

Understanding that distinction makes the product easier to evaluate realistically.

The Bottom Line

The repeated-bout effect is one of the clearest examples of the body learning from exercise.

An unfamiliar workout—especially one rich in eccentric contractions—can initially produce substantial soreness, temporary strength loss and other signs associated with exercise-induced muscle damage.

Perform a similar workout later, and the response is often noticeably different.

A 2023 meta-analysis of 20 multiarticular-exercise studies found less DOMS and lower creatine kinase after repeated bouts, along with better preservation of muscular strength and vertical-jump performance.

The reason appears to involve more than one adaptation. Research points toward neural changes, structural and extracellular-matrix remodeling, cellular adaptations, and changes in inflammatory responses.

Perhaps the most useful lesson is practical:

You do not need to recreate severe soreness every time you train.

Less soreness after repeating an exercise can be evidence that your body has become better prepared for the stress.

That is not a failed workout.

That is adaptation.

And because even reduced-volume or lower-intensity initial eccentric exercise can provide some protection against later harder exercise, smart progression may let you earn that adaptation without making the first session unnecessarily punishing.

Train.

Adapt.

Recover.

Then become capable of doing more.

[[AUTHOR_BIO]]

Frequently Asked Questions

What is the repeated-bout effect in simple terms?

The repeated-bout effect is the body's protective adaptation to a previous exercise exposure. After an unfamiliar or damaging exercise bout, performing a similar bout later typically results in less soreness, less disruption in muscle-damage markers and better preservation of function.

Why am I less sore the second time I do the same workout?

Your muscles and nervous system adapted to the first exposure. The repeated-bout effect appears to involve neural, structural, cellular and inflammatory adaptations that make the body better able to tolerate similar exercise later.

Does less soreness mean the workout is no longer effective?

No. Reduced soreness can reflect adaptation to the exercise rather than lack of training stimulus. The repeated-bout effect specifically demonstrates that soreness and other markers of disruption can fall after repeated exposure.

Can one workout create the repeated-bout effect?

Yes. Research has repeatedly shown that a single prior bout of eccentric exercise can reduce markers of muscle damage following a later similar bout.

Does the first workout need to be extremely hard?

No. Studies have demonstrated protection after reduced-volume and lower-intensity initial eccentric exercise, although the magnitude of protection can depend on the original exposure.

How long does the repeated-bout effect last?

Research shows that protection can persist for weeks, but the effect depends on the exercise, muscle, initial exposure and interval between sessions. Protection generally declines as the time between exposures becomes longer.

Why does downhill running make people so sore?

Downhill running requires substantial eccentric work from muscles such as the quadriceps as they control descent and absorb force. If that loading pattern is unfamiliar, it can produce substantial DOMS. A 2024 study in trained female runners found less soreness during a repeated downhill-running exposure three weeks later.

Does the repeated-bout effect occur in experienced athletes?

Yes, especially when an athlete encounters a movement or loading pattern that is unfamiliar. Training status in one activity does not guarantee adaptation to every type of mechanical stress.

Does being sore mean I damaged my muscles?

Soreness can accompany exercise-induced muscle damage, but it is only one indirect marker and does not provide a precise measurement of tissue damage by itself. Researchers typically evaluate soreness alongside strength, range of motion, blood markers and other outcomes.

Should every good workout make me sore?

No. Soreness is not required for productive training. As your body adapts to a repeated exercise, soreness often decreases even though you continue training the muscle.

Can LactiGo cause the repeated-bout effect?

No evidence establishes LactiGo as the cause of the repeated-bout effect. The repeated-bout effect is a physiological adaptation to exercise exposure. LactiGo with menthol is labeled for temporary relief of minor aches and pains of muscles and joints.

What is the active analgesic ingredient in LactiGo?

The current U.S. Drug Facts label lists menthol 1.25% as the active ingredient and identifies its purpose as a topical analgesic. L-carnosine and magnesium sulfate are listed among the inactive ingredients.

References

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