The Relaxation Response: Herbert Benson's Simple Protocol

Herbert Benson was a Harvard cardiologist who spent the late 1960s trying to figure out why some of his hypertensive patients had blood pressure that jumped every time they walked into the clinic. The obvious answer was stress. The harder question was whether the opposite of stress was a real, measurable, reproducible physiological state, or just an absence of trouble.

He decided it was a real state. He gave it a name that stuck: the relaxation response.

The work he published between 1971 and 1975 established, for the first time in a mainstream Western medical journal, that a person could deliberately downshift their own autonomic nervous system using a simple, secular, teachable technique. That claim is now so absorbed into the culture that it feels obvious. It was not obvious then, and the evidence for how well it actually works is more nuanced than the popular version suggests.

What Benson actually measured

The founding studies were done at Boston’s Beth Israel Hospital and later at the Thorndike Memorial Laboratory. Benson and his collaborator Robert Keith Wallace recruited subjects who practiced Transcendental Meditation, wired them to instruments, and watched what happened when they sat and repeated their mantra for twenty minutes.

The results were consistent and reproducible. Oxygen consumption dropped by roughly 10 to 17 percent, more than the drop seen in ordinary sleep. Respiratory rate slowed. Blood lactate, a marker of sympathetic nervous system activity, fell sharply within the first ten minutes and stayed low. Skin resistance increased, indicating reduced sweat gland activity. Alpha wave activity in the EEG increased.

These were not spiritual measurements. They were the standard tools of physiology, and they showed a coherent picture: a hypometabolic, wakeful state that looked like the mirror image of the fight-or-flight response Walter Cannon had described half a century earlier.

Scientific Receipt. Does a simple mental technique actually shift autonomic physiology? In 36 experienced practitioners, oxygen consumption fell by an average of 17 percent, respiratory rate dropped by three breaths per minute, and blood lactate declined nearly four times faster than during quiet sitting. The subjects were self-selected meditators who already believed the practice worked, so the effect size in a general population would likely be smaller. Wallace, Benson, Wilson, American Journal of Physiology, 1971.

Benson’s insight was that the technique itself did not need to be Transcendental Meditation. He suspected that similar contemplative practices across cultures (Christian centering prayer, Jewish davening, Sufi zikr, yogic mantra, Buddhist samatha) shared a common physiological core, and that this core could be extracted and taught without any of the religious framing.

He tested this. Subjects using a neutral English word produced the same drop in oxygen consumption as subjects using a Sanskrit mantra. The response was in the method, not the metaphysics.

The four elements

In his 1974 paper in Psychiatry and his 1975 book The Relaxation Response, Benson distilled the technique into four elements. These are still the operational definition used in most subsequent research.

A quiet environment. Not silent, but low-stimulation. The point is to reduce the number of things pulling the attention outward. A closed room, a park bench in the early morning, a chair in a corner facing away from a screen. Anything that lets the sensory field stay narrow for ten to twenty minutes.

A mental device. A single, short word, phrase, sound, or object of gaze. Repeated silently on the exhale, or held gently in awareness. The word “one” was Benson’s default because it is short, meaningless, and hard to attach a story to. Any short focus word works. So does watching the breath, or a mental image of a flame.

A passive attitude. This is the element most people misunderstand. Distractions will arise. Thoughts, sensations, plans, sudden itches, the memory of an unpaid bill. The instruction is not to fight them or push them away. It is to notice them, let them pass, and gently return to the word. Benson called this “oh well” thinking. The moment the practice becomes another task to succeed at, the response collapses.

A comfortable position. Not lying down, because most people fall asleep. A chair with the back supported, feet flat, hands resting. Comfortable enough to sit for twenty minutes without shifting. Uncomfortable enough to stay awake.

The prescription is ten to twenty minutes, once or twice a day, ideally not right after a meal (digestion pulls blood to the gut and interferes with the response).

That is the entire protocol. It is deliberately unremarkable. Its unremarkability is part of what made it exportable to hospital clinics, corporate wellness programs, and eventually the American Heart Association’s guidelines for adjunctive blood pressure management.

Why “the opposite of fight-or-flight” is roughly, but not exactly, right

Benson framed the relaxation response as the physiological opposite of the stress response Cannon had described in the 1910s. That framing is useful but incomplete.

The stress response is a coordinated sympathetic-adrenal cascade: heart rate up, blood pressure up, catecholamines released, blood shunted from viscera to skeletal muscle, glucose mobilized, digestion suppressed. It is designed for short, intense, motor demands.

The relaxation response reverses several of these variables (reduced oxygen consumption, slower breathing, lower blood lactate, decreased sympathetic tone) but it is not identical to parasympathetic dominance during sleep or digestion. EEG in relaxation response looks awake, with prominent alpha and occasional theta. Sleep looks different. Digestion looks different.

More recent work using polyvagal theory (Stephen Porges) suggests that the state Benson identified is closest to what Porges calls the “ventral vagal” state: a socially engaged, safely aware calm mediated by the myelinated vagus nerve. This is the state where the heart rate slows on the exhale, facial expression softens, and the middle ear muscles shift toward picking up human voice frequencies rather than threat sounds. If you want to go deeper on the vagal side of the machinery, the nervous system reset guide covers the specific pathways involved.

For practical purposes, “opposite of fight-or-flight” is a fair shorthand. For research and clinical work, “a distinct, wakeful, hypometabolic state with reduced sympathetic activation” is more accurate.

The evidence for clinical effects

The relaxation response has been studied for a wide range of conditions since the mid-1970s. The evidence is uneven, and honest reporting requires distinguishing what is well-supported from what is preliminary.

Blood pressure. This is the strongest evidence base. Multiple randomized trials and meta-analyses have shown that regular practice produces modest reductions in systolic and diastolic blood pressure in people with mild to moderate hypertension. Typical reductions are 3 to 5 mmHg systolic and 2 to 3 mmHg diastolic, which is meaningful at a population level (roughly comparable to reducing salt intake or losing a few pounds) but not a replacement for medication in significant hypertension. The 2013 American Heart Association scientific statement on alternative approaches to blood pressure classified TM (which produces the relaxation response) as having modest evidence and reasonable to consider as an adjunct.

Anxiety. Meta-analyses of relaxation-response-based interventions for generalized anxiety show small to moderate effect sizes, roughly comparable to other structured relaxation techniques and somewhat smaller than cognitive behavioral therapy. The effects are more reliable for state anxiety (how anxious you feel in the moment) than trait anxiety (your baseline disposition).

Insomnia. Gregg Jacobs and colleagues at Harvard developed a relaxation-response-based cognitive behavioral therapy for insomnia in the 1990s that outperformed the sleep drug zolpidem in a 2004 randomized trial for chronic insomnia, and unlike the drug, the effects persisted after treatment ended. This is one of the more robust findings in the literature. The sound healing for sleep protocol draws on related mechanisms.

Chronic pain. Effects are modest and inconsistent. Most trials show small reductions in pain intensity and larger reductions in pain-related distress and functional impairment. The technique appears to change the relationship to pain more than the pain signal itself.

Gene expression. In the 2000s and 2010s, Benson’s group collaborated with molecular biologists to look at whether the relaxation response produced measurable changes in gene expression. The 2008 Dusek study and 2013 Bhasin study reported changes in genes related to energy metabolism, insulin secretion, and inflammatory response, both after long-term practice and, more surprisingly, after a single session in novices. These findings are interesting but preliminary. The sample sizes were small, the pathways implicated are broad, and independent replication has been limited.

Scientific Receipt. Does the relaxation response actually change gene expression? Whole-blood transcriptome analysis in 26 long-term practitioners and 26 novices, before and after eight weeks of training, showed significant differential expression in genes related to mitochondrial function, insulin signaling, and inflammation. The novice effects appeared after a single 20-minute session. The sample was small, the analysis involved thousands of genes (raising concerns about multiple comparisons), and the mechanistic pathway from mental focus to transcription factor activation remains unclear. Bhasin et al., PLoS ONE, 2013.

Where Benson fits in the current landscape

If you look at the modern nervous system regulation toolkit, most of what works traces back to one of a few mechanisms: slow breathing that engages the parasympathetic branch of the vagus nerve, focused attention that reduces default mode network activity, or safety cues that shift the brain out of threat assessment. Benson’s protocol quietly does all three.

The breathwork research shows that slow, extended exhales lower heart rate and blood pressure through the baroreflex. The passive attitude in Benson’s protocol naturally slows the breath. The mental device occupies working memory in a way that seems to quiet ruminative thinking, similar to the mechanism proposed for box breathing. The comfortable position and quiet environment provide the safety signals the ventral vagal system needs to stay engaged.

It is not the flashiest tool. It has no wearable, no app requirement, no proprietary breathwork sequence. Twenty minutes, a chair, a word. That plainness is probably why it survived fifty years of wellness trends. It is also why it consistently shows up in the cortisol regulation literature as a first-line non-pharmacological option: the mechanism is well-characterized, the dose is standardized, and the side effect profile is essentially nil.

How to actually do it

The protocol has not changed since 1975. There is no updated version. The instructions below are Benson’s, condensed.

1. Sit comfortably in a quiet place. Chair, feet flat, hands on the thighs or in the lap.
2. Close your eyes.
3. Relax the muscles, starting at the feet and working up to the face. Take one or two breaths to do this.
4. Breathe through the nose. On each exhale, silently repeat a chosen word (one, peace, calm, ocean, or a short phrase that is meaningful and neutral for you).
5. When distractions arise (thoughts, sensations, the sound of the refrigerator), notice them without judgment and return to the word. Do not evaluate how well you are doing.
6. Continue for ten to twenty minutes. You may open your eyes to check the time. Do not use an alarm that startles.
7. When finished, sit quietly for a minute with the eyes closed, then a minute with the eyes open, before returning to activity.
8. Practice once or twice a day. Not within two hours of a large meal. Not right before sleep if you want the wakeful hypometabolic state (though many people find it helps with sleep onset, which is fine).

The passive attitude is the hardest part for most people. The technique is boring on purpose. The moment you start grading yourself on how relaxed you feel, you have introduced the sympathetic activation you were trying to reduce. The instruction is genuinely: do the steps, and let whatever happens happen.

What this actually means

The relaxation response is one of the small number of nervous system regulation techniques with fifty years of published physiological measurement behind it. The core finding (that a simple, secular, teachable practice can reliably shift autonomic tone in the direction opposite to acute stress) has held up. The clinical effects are modest but real for blood pressure, anxiety, and insomnia, and less well-established for gene expression, chronic pain, and other downstream outcomes.

It is not a cure for anything. It is a low-cost, low-risk, well-characterized tool that reliably produces a specific physiological state. Whether that state helps depends on what you are using it for.

If you want a place to start, twenty minutes tomorrow morning, in a chair, with the word of your choice, will tell you more about whether the technique fits you than any amount of reading. If it feels useful, do it again the next day. If after two months of near-daily practice nothing has shifted, try something else. The nervous system responds to a range of inputs, and no single protocol is right for every body. A broader overview of the options lives in the free starter guide.

Benson’s contribution was not inventing the technique. Every contemplative tradition had some version of it long before he arrived. His contribution was measuring it carefully enough that a cardiologist could recommend it without embarrassment, and describing it plainly enough that anyone could practice it without a teacher. Fifty years later, that combination is still rare.