Circulation and breathing

Note: This guide is an overview of published sources, not medical advice and not a tying lesson. An injury from rope needs a medical professional, as Rope 365 and MedlinePlus both advise.

Rope presses on the body. Pressed in the wrong place, or for too long, it can slow the blood reaching a hand or foot, and around the neck or chest it can make breathing harder. Rope 365 calls circulation problems very common and usually short-lived, and links deaths in rope mainly to being alone or to restricted breathing, often both. This guide describes what educators and medical sources say about circulation and breathing, and about fainting, which connects them. See also Nerve injuries in rope and Safety.

Circulation

Rope 365, the practice project by Ebi McKnotty, calls restricted circulation very common. Its first sign is usually numbness in the whole part of the limb beyond the rope, followed by pins and needles as blood returns; this normally fades within minutes once the pressure is off. The catch, Rope 365 warns, is that the numbness can mask a nerve problem underneath, and nerve problems are the ones that last.

The ESINEM Shibari Classes course describes several signs it associates with restricted circulation: hands or feet that have grown noticeably colder during a session, a nail whose color is slow to return after pressure, a clear color difference between the two sides of a rope, and pins and needles, numbness or other unusual sensations, which may also point to a nerve. It notes that hands are usually affected first, that knots over blood vessels such as the inside of the wrist are a concern, and that some people’s skin turns purple under slight pressure without any harm, so knowing a partner’s body matters.

None of these signs works as proof that all is well. The course itself calls temperature only a rough guide. The nail sign has a clinical counterpart: MedlinePlus describes the capillary nail refill test as a measure of blood flow to the hands and feet, in which color normally returns in under two seconds. It also sets out its limits: a slow result can have several causes, and the page states that its information is not for use in a medical emergency or for diagnosis, which belong to a licensed medical professional. Rope 365 adds that nerve injury often gives no signs at all.

Sources weigh visual signs differently. ESINEM treats color changes as a classic warning sign, while Rope 365 calls skin color an unreliable guide and puts talking to the person first. Both agree that the person in rope should report odd sensations immediately rather than tough them out. See also the glossary entry circulation.

Breathing

The neck. Rope educators agree on keeping rope off the front of the neck. Rope 365 advises against rope around the front or sides of the neck. The ESINEM course goes further: it rules out nooses entirely, presents a halter-neck style as the only acceptable neck rope, and warns that rope can slide up onto the neck, a risk that grows in suspension or if the person falls or faints.

The chest. Chest ropes that are too tight can restrict breathing, and ESINEM points out that tension rises with every added wrap, cinch or load. A tie that is comfortable on the floor can become crushing once body weight hangs from it. It singles out corsets, which already leave little room to breathe.

Gags and the mouth. A tied person cannot remove a gag that becomes a problem, ESINEM notes, and anything that could be swallowed or block the airway is out. Rope 365 also counts gags and corsets among things that restrict airflow.

Position. Rope 365 names backbends, forward bends and pressure on the chest as positions that can restrict breathing, and advises being able to untie quickly. ESINEM adds that stress and exertion raise breathing demand and that holding a fixed position for a long time can tire the muscles used to breathe.

Positional asphyxia: an unsettled question

“Positional asphyxia” means breathing that becomes inadequate because of body position. The ESINEM course describes it as made worse by stress, exhaustion, alcohol, drugs and conditions such as obesity, and as a recognized concern in deaths during restraint by police and other staff. Its longer article on the topic summarizes the research: restraint face down is likely to restrict breathing more than restraint face up, and bending the body or putting weight on it may matter more still.

The forensic literature is less certain than that summary might suggest. A 2002 review in the British Journal of Forensic Practice by John Parkes concluded that the evidence on whether position alone causes sudden deaths in restraint remained unclear, while still summarizing measures for staff whose work involves restraining people. ESINEM’s own article reports a hogtie study that found no evidence that position alone causes inadequate breathing, and stresses that this does not make long, unattended hogties safe; it notes that police and health staff are now often taught to avoid face-down restraint or keep it very short. The sources differ in emphasis, but none treats a tied person left alone as safe: Rope 365 advises staying with a bound partner at all times.

What the fatality research shows

A 2022 literature review in the International Journal of Legal Medicine by Schori, Jackowski and Schön collected seventeen published cases of death during BDSM play. Strangulation caused fifteen of them. A toxicology report was mentioned in thirteen cases, and eight of those were positive, alcohol being the substance named most often; the other four cases give no result, so the review cannot say how common substances were overall, nor whether they caused the deaths. One case involved two people suspended together with rope around their necks; one died of mechanical asphyxia. The authors stress that such deaths are rare and preventable, state that the risks of breath play can never be removed, and warn about the danger of combining BDSM with alcohol or drugs.

Rope 365 makes a similar point from the practitioner side: deaths in rope are usually linked to being alone or to restricted breathing. ESINEM puts it as most accidental deaths happening because the person could not call for help.

Fainting

Fainting matters because a tied person cannot catch themselves and may end up with rope across the neck or under strain. The ESINEM course lists contributing factors: not having eaten, dehydration, alcohol or drugs, tight bondage, and positions with the hands above the head. It names a sudden rise in body temperature and clammy skin as warning signs, and at those signs advises slackening or removing the rope and supporting the person. Rope 365 adds that locked knees while standing are a common cause, and its FAQ notes fainting as a particular risk in standing ties to a post. Both suggest eating and drinking enough beforehand and planning in advance what to do if someone faints.

Watching and asking

Because so many of these problems are silent, sources put weight on attention. The ESINEM course asks the person tying to watch the face, breathing and skin temperature, and to ask when unsure; it describes a silent double hand squeeze as a way to check on someone who is absorbed in the experience. See check-in, Cutting and emergency release for being able to get someone out quickly, and Suspension risks for what changes once weight comes off the floor.