How Chaos Training Triggers Growth Hormone Secretion and Why It Matters for Height.
Most growth hormone is released under two conditions: during deep sleep, or after exercise.
But the type of exercise you do, and more specifically, the intensity determines whether your body releases a meaningful surge of growth hormone or barely responds at all.
That’s where chaos training comes in.
And once I understood the mechanism behind it, it simply became a non-negotiable part of my grow taller exercise routine.
What Is Chaos Training?
Chaos training , also referred to as High-Intensity Interval Training (HIIT) involves short, intense bursts of exercise followed by brief rest or low-intensity recovery periods.
What makes it chaotic is the unpredictable demand it places on your muscles and cardiovascular system.
You’re lifting weights, sprinting, cycling, climbing stairs, pushing hard enough that your muscles are temporarily too exhausted to move voluntarily.
That point of near complete muscle failure, as uncomfortable as it may sound, is exactly where the growth hormone magic happens.
Craig, Brown, and Everhart from the National Institute of Health found that weight lifting and strength training can trigger the secretion of both testosterone and growth hormone at any age , though the younger you are, the more pronounced the hormonal response.[ 1 ]
How Chaos Training Increases Growth Hormone Output.
The key is reaching what exercise scientists call the lactate threshold ;
This is the point at which your muscle are worked – out to the point of failure or exhaustion.
The point at which blood lactate levels rise sharply because your muscles are working faster than your circulatory system can deliver fresh oxygen.
When this happens, your body switches from aerobic (relying on oxygen as a source of fuel or to meet energy demands) to anaerobic (without oxygen) energy production, generating lactic acid as a byproduct.
As lactic acid leaks out of the muscle tissue, hydrogen ions flood into the bloodstream, and it’s this rise in blood lactate that acts as one of the primary triggers for growth hormone release.
The research backs this up:
vigorous exercise above the lactate threshold, sustained for at least 10 minutes, produces the strongest natural stimulus for HGH secretion.
A pilot study examining HIIT versus moderate continuous exercise in young women confirmed that high-intensity interval training significantly increases total pulsatile growth hormone secretion compared to moderate-intensity steady-state exercise[2 ]
One thing worth knowing:
The second intense interval in a session triggers a slightly smaller HGH response than the first, the third less than the second, and so on.
This is completely normal and doesn’t mean the session isn’t working, rather it means that you shouldn’t mindlessly pile on intervals chasing diminishing returns.
Why Growth Hormone Matters for Height and Bone Growth.
Growth hormone isn’t just a muscle-building hormone.
It plays a direct and well-documented role in skeletal growth, bone remodeling, and cartilage maintenance. Here’s exactly how:
1. It stimulates longitudinal bone growth at the growth plates.
GH triggers the multiplication and differentiation of prechondrocytes and osteoblasts (the cells responsible for new bone formation) within the growth plate.
This is followed by a clonal expansion driven by GH-induced production of Insulin-Like Growth Factor I (IGF-I), which amplifies the effect further.
2. It regenerates and repairs cartilage.
This one is underappreciated. Your spinal discs are composed largely of cartilage; cartilage that degenerates with age.
It’s partly why up to 40% of people over 40 begin losing a few millimeters of height.
GH stimulates cartilage growth by increasing cell number rather than cell size, which means real structural regeneration, not just temporary swelling. [3 ]
3. It directly promotes skeletal and muscular tissue growth.
GH acts on preadipocytes to stimulate bone growth directly, while IGF-I takes over at a later stage of cellular development. The two work in sequence , GH initiates, IGF-I amplifies.
4. It triggers IGF-1 release from the liver.
One of GH’s most important downstream effects is signaling the liver to produce and release IGF-1, which then both directly and indirectly promotes longitudinal bone growth.
It does this by stimulating transcription of the IGF-I gene in liver cells.
5. It drives bone remodeling until peak bone mass is reached around age 30.
Bone remodeling is a continuous process ; old bone is resorbed and new bone forms in its place.
GH helps tip this balance toward formation.
Studies on adult dogs showed a 2% increase in bone mass after roughly 90 days of GH treatment.
A subsequent study on older female monkeys ; whose bone metabolism closely mirrors that of humans found increased bone formation rates in both the femur and tibia after just seven weeks of GH administration. [4 ]
How Intermittent training should be done.
Exercising intermittently in this case means short intense bursts of exercising followed by exercising slowly or even complete rest.
For instance, pedaling or cycling very fast for a minute then cycling slowly or completely resting for a minute before cycling very fast again.
In other words, exercises are performed at irregular intervals.
The major aspects of H.I.I.T are that exercises should be brief, sporadic, and intense performed with a high degree of determination.
However, like earlier mentioned, the second intense workout triggers less H.G.H response compared to the first, the third less than the second, etc.
What is the best time to do chaos training?
One question I get asked very often by those who either work evening shift or for whatever reason can’t exercise in the evening is;
Is it better to do H.I.I. T in the morning or in the evening?
The answer to this question is evening chaos training is slightly better and I personally prefer doing my training in the evening.
What are the advantages of doing it in the morning?
The advantage of doing H.I.I.T in the morning is that in the morning you are in a fasted state, so it is easier to maximize the GH spike due to Low Insulin Levels.
Insulin and Growth Hormone have an inverse relationship;
When insulin is low (after an overnight fast), the body is primed to release more GH.
If you eat a carb-heavy meal before an evening workout, the resulting insulin spike can blunt the GH response.
What are the challenges of doing morning H.I.I.T for gh?
The major disadvantage of doing it in the morning is that doing it in the morning doesn’t directly align with your biggest natural GH surge which is at night.
Secondly, in the morning your body is still cold and cortisol (also known as the stress hormone) tends to be high in the morning so you may struggle to push harder to reach the lactate limit.
Why I personally think evening is better.
I personally prefer doing H.I.I.T at least 2 to 4 hours before bed time and here’s why;
1.) In the evening, the body is fully warmed up, so I can easily push harder and reach higher intensity required to reach the lactate thresh hold which may result in a larger acute GH spike compared to a sluggish morning session.
2.) Secondly, Sleep researchers have found that physically active individuals tend to have longer total sleep times and more slow-wave (deep) sleep especially on nights following exercise.
Deep sleep is also when the largest natural pulse of growth hormone secretion occurs during the day.
3.) Combining an exercise-triggered GH release in the evening with the sleep-triggered GH pulse a few hours later is, as far as I’m concerned, one of the most effective natural hormonal stacks available to anyone not using pharmacological intervention.
4.) Finally, if you struggle to fall asleep at night, a hard evening HIIT session may solvs that problem almost entirely.
Your body is forced into recovery mode, and sleep comes faster, deeper, and with fewer interruptions.
Caveat
It’s however important to note that doing chaos training too close to bedtime might ruin your sleep quality due to elevated cortisol hormone and body temperature.
a late-night workout that causes insomnia will actually decrease your total GH levels since the majority of your daily GH is produced during deep sleep.
More reasons to do chaotic exercises
1. Burning fat
Research out of Hebei Normal University found that HIIT outperforms prolonged continuous exercise for reducing abdominal visceral fat, particularly in those dealing with obesity.
Exercise physiologist Scott Weiss puts it plainly:
The bursts of increased intensity raise overall caloric expenditure, meaning more total calories burned , both during and after the workout compared to steady-state cardio.
2. Increase stamina.
Researchers at the Karolinska Institute in Sweden found that just 60 seconds of high-intensity work during an otherwise moderate session measurably improved endurance.
A separate study on type-2 diabetic patients showed that interval walkers improved their VO2 max — a direct measure of cardiovascular fitness — while continuous walkers saw no change at all.
VO2 max is the maximum amount of oxygen your body can use in a set amount of time, and it’s a function of the number of red blood cells you have, how adapted you are to endurance activities, and how much blood your heart can pump.
3. No boredom.
Studies show HIIT is rated more enjoyable than low-intensity steady-state exercise.
Exercise physiologist Tom Holland makes the point that beyond the physiological benefits, you’re also far more likely to stick to a workout you actually enjoy, and consistency, over time, matters more than any single session.
4. Good for your heart health.
Cardiologists are increasingly recommending HIIT over moderate continuous exercise, even for cardiac patients.
The interval structure trains cardiac muscles to pump blood more efficiently by repeatedly pushing into and recovering from the maximum heart rate zone, a stimulus that steady-state exercise simply doesn’t provide .
Final Thoughts
If you’re building a height optimization routine and haven’t incorporated chaos training yet, I’d argue it’s the single highest-leverage addition you can make.
Doing it every other day of the week is absolutely counter productive.
For more on appropriate spacing between chaos training sessions, the best exercises to include for optimal results and guidance on incorporating chaos training in your grow taller exercise schedule read 👉 The Grow Taller After Puberty Exercise Routine Guide »»»
References and Further Reading:
1.Effects of progressive resistance training on growth hormone and testosterone levels in young and elderly subjects (1989)
2.Pilot study: an acute bout of high intensity interval exercise increases 12.5 h GH secretion (2018)
3. The Regeneration of Articular Cartilage with Prolotherapy (2009)
4. Preservation of bone mass in hypogonadal female monkeys with recombinant human growth hormone administration (1992)
AUTHOR BIO
Dennis Raney (B.Sc.) is an author and a blogger specializing in natural body growth optimization strategies.
After years of navigating the psychological and physical challenges of being under-average height, Dennis dedicated over a decade to researching the intersection of lifestyle, nutrition, and body growth.
By applying an evidence-based approach to healthy lifestyle changes, he successfully navigated his own body transformation, an experience that led him to author his comprehensive guide on height increase during and after puberty.
Today, he shares his wealth of fact based insights through his book and blog to help others overcome similar adversities.
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Interested in connecting? :
✉️ Send an email: Dennis »»
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