Pressure and pelvic-floor biofeedback (Kegel perineometer)

1. Introduction

Version followed: UK NHS pelvic-health practice as framed by NICE NG123 (urinary incontinence and pelvic organ prolapse in women, 2019) and NICE "Pelvic floor dysfunction: prevention and non-surgical management" (December 2021, reported as NG210 [uncertain: number not shown on the page cited]), with trauma-informed practice from Stirling et al. (CSIRO Publishing discussion paper, c. 2025) and Modesto et al. (2025). History from Kegel's 1948 paper as summarised by the Embryo Project Encyclopedia.

What it is. Pelvic-floor biofeedback uses a sensor to turn the activity of the pelvic floor muscles, which a person cannot normally see, into a signal on a screen (a rising number, a line or lights), so that the person can learn to contract, hold and fully relax those muscles correctly. Signals may be pressure (manometry, the principle of Kegel's perineometer), muscle electrical activity (surface electromyography, EMG) or real-time ultrasound images. Sensors are either internal (a small internal probe) or external (adhesive skin electrodes, or an ultrasound probe on the abdomen). [source: Kent Community Health NHS leaflet 2025; Embryo Project 2024; Stirling et al.]

Who delivers it. This is not a psychotherapy procedure. It is delivered within continence and pelvic-health services by specialist pelvic-health physiotherapists (the NHS leaflets cited name the physiotherapist), and also by continence nurse specialists, urogynaecology teams and, for bowel disorders, gastrointestinal physiology or colorectal teams [source: Kent Community Health NHS 2025; Oxford University Hospitals leaflet 2022; the nurse, urogynaecology and bowel roles are [synthesis] from service structures, not stated in the pages cited]. In the US, a voluntary credential, BCIA Board Certification in Pelvic Muscle Dysfunction Biofeedback (PMDB), is open only to licensed health-care providers [source: Wikipedia, BCIA article] [uncertain: secondary]. The psychotherapist's job is to work alongside this team: referral, preparation, care for anxiety, shame and trauma, and psychological treatment of pelvic pain and genito-pelvic pain/penetration difficulties (vaginismus) in parallel.

History, briefly. Arnold H. Kegel (1894–1972), a Los Angeles gynaecologist, published "Progressive Resistance Exercise in the Functional Restoration of the Perineal Muscles" in the American Journal of Obstetrics and Gynecology (1948, vol. 56, pp. 238–48). He introduced the perineometer in the late 1940s: a pressure-sensing internal device linked to a display, used to record how strongly a patient could squeeze and to track gains in strength as she exercised. Perineometers remain in clinical and research use, and studies have compared them with EMG. [source: Embryo Project Encyclopedia, Johnson 2024]

Core idea of change. Many people cannot locate or isolate the pelvic floor, or they substitute other muscles (buttocks, thighs, abdomen, breath-holding). Making the contraction visible gives immediate feedback, so the person learns the correct action and then practises it without the device. [source: Kent Community Health NHS 2025] For people with over-active, painful or guarded pelvic floors, the same visibility is used to learn relaxation and down-training [synthesis].

Guideline status. NICE (2019) advises against routinely offering EMG biofeedback as part of pelvic floor muscle training (PFMT) for urinary incontinence in women, while keeping biofeedback as an option for women who cannot contract their pelvic floor muscles [source: NIHR Evidence alert on the OPAL trial, which reports the NICE position; NICE recommendation text not verified, wording [uncertain]]. NICE's 2021 pelvic floor dysfunction guideline says to consider supplementing PFMT with biofeedback, electrical stimulation or other adjuncts for women unable to perform an effective contraction [source: GPnotebook summary of NICE 2021]. The OPAL trial (600 women, 23 UK centres) found no meaningful difference at two years between supervised PFMT with and without EMG biofeedback, and concluded that biofeedback should not be offered routinely [source: NIHR Evidence alert].

2. Framework

The treatment sits inside a pelvic-health pathway, not a stand-alone course. The stages below describe that pathway and, in parallel, where the psychotherapist fits.

[source: stage D and E durations and reviews from GPnotebook summary of NICE 2021; stage C alternatives from Oxford University Hospitals leaflet 2022 and Stirling et al.; table structure and psychotherapist column are [synthesis]]

Format. In the NHS services cited: individual face-to-face appointments with a physiotherapist, plus daily home practice; in OPAL, six supervised appointments over 16 weeks [source: NIHR Evidence alert; Kent Community Health NHS 2025]. Session counts vary by service and are set by the team, not the psychotherapist.

3. Guiding principles

• Biofeedback is a tool inside pelvic floor training, not the treatment itself. Expect the team to begin with exercise teaching; do not present biofeedback as essential. [source: NICE position via NIHR Evidence; OPAL]
• Stay in your scope. Never describe, demonstrate or coach intimate procedures; route physical questions to the physiotherapist or GP. [synthesis]
• Consent is ongoing, specific and voluntary. Consent is "iterative in nature", not a one-off; it can be withdrawn at any time [source: Stirling et al.]. Practically: help clients expect to be asked at each step and to know they may say no.
• The right to stop is real. Clients can decline or change their mind after agreeing, and treatment continues with alternatives [source: Oxford University Hospitals leaflet 2022]. Practically: rehearse a stop signal before the first appointment.
• Silence or stillness is not consent. Tonic immobility can block speech and movement, so acquiescence must not be read as consent [source: Stirling et al.]. Practically: warn trauma survivors this can happen and agree a non-verbal or written signal with the team.
• Chaperones are a right. Every patient may ask for a chaperone, usually a trained team member, sometimes a friend or relative; if none is available the appointment can be rebooked [source: Oxford University Hospitals leaflet 2022]. Practically: help the client decide in advance and ask when booking.
• Alternatives to internal sensors exist. Skin electrodes, observation, external assessment and transabdominal ultrasound biofeedback can replace or precede an internal probe [source: Kent Community Health NHS 2025; Stirling et al.; Oxford University Hospitals 2022]. Practically: the client never has to choose between an internal sensor and no care.
• Disclosure is the client's choice. Previous difficult examinations, sexual assault or psychosexual problems may be shared but need not be [source: Oxford University Hospitals leaflet 2022]. Practically: help the client decide what, if anything, the team needs to know, with their consent to share.
• Share control. Clinicians are advised to share control of the approach with the patient and to ask before each step [source: Modesto et al. 2025]. Practically: support the client to ask for explanations, positions, clothing and pacing that feel manageable.
• Work from outside in. Trauma-informed physiotherapy builds capacity with external, whole-body work before any internal work, moving gradually towards and away from difficult sensations [source: Stirling et al.]. Practically: your grounding and regulation work prepares the ground for this.
• Collaborate with consent. Coordinate with the physiotherapist only with the client's written agreement, sharing what helps care. [synthesis]
• Look after the clinicians. Vicarious trauma is recognised in this work; supervision and debriefing are recommended [source: Stirling et al.]. Practically: use supervision for your own reactions to intimate material.

4. Intervention inventory

Part A describes how the pelvic-health team delivers biofeedback, at a descriptive level only, so you can explain it accurately and spot misunderstandings. Part B is the psychotherapist's own work. You do not deliver, demonstrate or coach Part A.

Part A: how the pelvic-health team delivers it (descriptive)

A1. Assessment before training

• Purpose: Establish the problem (stress, urge or mixed incontinence, prolapse, bowel symptoms, pain) and whether the client can contract and relax the pelvic floor correctly. [source: Oxford University Hospitals 2022]
• What happens: A specialist history, then, only with consent, an intimate assessment that may include external or internal assessment of pelvic floor muscle function, prolapse, pain sources and scar tissue. If the client declines, the physiotherapist can still observe breathing, movement and use of other muscles while the client is clothed, although strength and technique cannot then be confirmed. [source: Oxford University Hospitals 2022] Trauma-informed alternatives include observation without touch and transabdominal ultrasound. [source: Stirling et al.]
• Example language (illustrative): "From what you've read, the physio will ask first and explain each step, and you can say no to any part of it and still get help."
• Watch for: Clients who believe an internal examination is compulsory, or who avoid the appointment for that reason.

A2. Pressure (manometric) biofeedback

• Purpose: Show the strength of a squeeze as a pressure reading. This is the principle of Kegel's perineometer. [source: Embryo Project 2024]
• What happens: A small internal pressure sensor is connected to a display; the reading rises as the muscles contract, and the patient uses it to judge effort and progress. [source: Embryo Project 2024] Kegel also used the readings to monitor gains in strength over time. [source: Embryo Project 2024]
• Watch for: Pressure readings can rise if the person bears down or tightens the abdomen instead of lifting; teams check for this. [synthesis]
• Example language (illustrative): "The reading is just a guide to how strongly the muscles are working. The physio will help you read it, and you can always ask them to explain what they're doing." [synthesis]

A3. EMG biofeedback (internal or surface sensor)

• Purpose: Show the electrical activity of the pelvic floor muscles so the person can learn to contract more effectively, and, for over-active muscles, to let go. [source: Kent Community Health NHS 2025; relaxation use is [synthesis]]
• What happens: An internal probe or, where needed, an adhesive skin pad picks up muscle activity; the patient sees a number that rises, or lights, when the muscles work, and some devices cue when to contract and relax. The physiotherapist guides contractions and watches for substitution (buttocks, thighs, abdomen, breath-holding). [source: Kent Community Health NHS 2025]
• Who it may not suit (as one NHS leaflet lists): aversion to an internal probe (a surface option exists), nickel allergy, current infection such as a urinary tract infection, pregnancy, epilepsy (only after neurology discussion), and care with an intrauterine device. [source: Kent Community Health NHS 2025] These are the team's decisions.
• Watch for: In OPAL, 21 women in the EMG group versus 2 in the exercise-only group had a complication possibly related to the intervention, with no serious complications in either group. [source: NIHR Evidence alert]
• Example language (illustrative): "You can ask whether a sensor on the skin is possible instead of an internal one. That's an ordinary request." [synthesis]

A4. Real-time ultrasound biofeedback

• Purpose: Let the patient see the pelvic floor moving on an ultrasound screen without any internal sensor.
• What happens: A probe on the lower abdomen shows the bladder base lifting with a correct contraction; this is offered as a trauma-informed alternative to internal assessment. [source: Stirling et al.]
• Example language (illustrative): "There are ways of seeing the muscles work from outside the body. You could ask the physio whether those are an option for you."
• Watch for: a client who assumes internal assessment is unavoidable; check they know external options exist and that they can ask for them. [synthesis]

A5. Home training with a loan device

• Purpose: Extend supervised practice into daily home practice.
• What happens: Patients are usually asked to practise daily, take the device home on loan, bring it to follow-up appointments, follow the cleaning instructions given and return it when physiotherapy ends. [source: Kent Community Health NHS 2025] Pelvic floor exercises without a device are the standard alternative. [source: Kent Community Health NHS 2025]
• Watch for: Shame about storing or using the device at home, privacy in shared housing, or practice turning into checking and monitoring. [synthesis]
• Example language (illustrative): "Where at home would you feel comfortable keeping and using the device? Let's plan for privacy." [synthesis]

A6. Bowel (anorectal) biofeedback

• Purpose: Used by bowel or gastrointestinal physiology services for bowel control problems and for difficulty emptying caused by poor coordination (dyssynergic defecation). [source: titles of NHS and gastrointestinal-society patient leaflets; content [uncertain: not verified]]
• Note: NICE advice on biofeedback for bowel conditions, including childhood constipation, is not verified here [uncertain: not verified]; check the current NICE guideline before telling clients what is recommended.
• What happens: specialist bowel services assess first and then deliver the training; see guide 044 for a descriptive account. [synthesis]
• Example language (illustrative): "Bowel symptoms have their own specialist service. Would you like help raising them with your GP?" [synthesis]
• Watch for: embarrassment that stops the client mentioning bowel symptoms at all; ask plainly and normalise. [synthesis]

Part B: the psychotherapist's interventions

B1. Recognising when to suggest medical review and referral

• Purpose: Many clients never mention leaking, urgency, bowel accidents, prolapse symptoms or pelvic and sexual pain because of embarrassment. Opening the topic gives access to effective, non-surgical care. [synthesis]
• Steps: (1) Ask routinely and plainly where relevant (after childbirth, menopause, pelvic surgery, chronic pain, sexual trauma, anxiety about leaving home). (2) Normalise. (3) Suggest a GP appointment or, where services allow self-referral, the local pelvic-health physiotherapy or continence service. (4) Ask urgently for medical review if there is new blood in urine or stool, sudden loss of bladder or bowel control, new numbness in the saddle area, or rapidly worsening symptoms. [synthesis: general red flags, not from the cited sources]
• Example language (illustrative): "Bladder and bowel problems are common and very treatable, and there are specialist physiotherapists who help with exactly this. Would you like to think about how to raise it with your GP?"
• Watch for: Withdrawal from exercise, work or intimacy that turns out to be driven by leakage or pain.

B2. Psychoeducation about pelvic floor training and biofeedback

• Purpose: Replace vague or frightening ideas with accurate, non-explicit information.
• Steps: (1) Explain that biofeedback is a way of seeing muscle activity on a screen to learn the right action. (2) Explain that sensors can be internal or on the skin, and that ultrasound from outside the body is sometimes used. (3) Explain the guideline position: training is the main treatment; biofeedback is an optional add-on, mostly for people who cannot yet feel or produce the contraction. (4) Point the client to their service's own leaflet and to the clinician for details. [source: Kent Community Health NHS 2025; Stirling et al.; NIHR Evidence alert]
• Example language (illustrative): "It's a bit like using a mirror when you're learning a new movement: the screen shows you what the muscles are doing so you can learn it, and then you practise without it."
• Watch for: You are not the source of procedural detail; when asked, say so and help the client write the question down.

B3. Trauma-informed preparation and consent planning

• Purpose: For clients with a history of sexual trauma, previous distressing examinations or psychosexual difficulties, plan how they will keep choice and control. [source: Oxford University Hospitals 2022; Stirling et al.]
• Steps: (1) Ask what the client fears most and what would help. (2) Clarify rights: to have things explained, to decline any part, to change their mind, to stop at any time, to a chaperone (asked for in advance), to rebook if none is available. [source: Oxford University Hospitals 2022; Stirling et al.] (3) Choose a stop signal, including a non-verbal one (raised hand, card, pen and paper), because freezing can block speech. [source: Stirling et al.] (4) List alternatives the client may ask about: skin sensors, ultrasound, external or clothed assessment, slower pacing. [source: Kent Community Health NHS 2025; Stirling et al.; Oxford University Hospitals 2022] (5) Decide what to disclose and who will say it: the client at the appointment, a short note, or you, with written consent. (6) Plan comfort and grounding aids. Clinicians are advised to honour requests about positioning and undressing, and to offer choices such as music. [source: Stirling et al.] (7) Plan aftercare for the day.
• Example language (illustrative): "You're allowed to say 'stop' or raise your hand at any point, and a good clinician will stop. Would it help to agree that signal with them at the start?"
• Watch for: Feeling obliged to agree to please the clinician; a plan that relies only on speaking up.

B4. Working with anxiety and anticipatory fear

• Purpose: Reduce avoidance of assessment and treatment. [synthesis]
• Steps: (1) Map the feared sequence from booking to leaving the clinic. (2) Identify predictions ("I'll panic", "they'll judge me", "it will hurt"). (3) Use standard anxiety methods within your own model: graded imaginal rehearsal of the non-intimate parts (waiting room, conversation, saying no), paced breathing and grounding, testing predictions after the visit. (4) Never use exposure to intimate procedures in therapy; graded physical work belongs to the physiotherapist. [synthesis]
• Example language (illustrative): "Let's walk through the appointment up to the point where you decide what happens next, and practise how you'd say what you need."
• Watch for: Panic, health anxiety or obsessive checking of symptoms.

B5. Working with shame and body image

• Purpose: Shame about incontinence, smell, sex or the body keeps people silent and isolated. [synthesis]
• Steps: (1) Name shame gently and normalise. (2) Separate the symptom from the self. (3) Use compassion-focused or cognitive work on self-criticism. (4) Explore effects on intimacy and partnership and, if wanted, plan a conversation with a partner. [synthesis]
• Example language (illustrative): "It makes sense this feels private. Lots of people feel embarrassed about this, and it's a health problem, not a personal failing."
• Watch for: Disgust, self-loathing, or shame linked to past abuse, which may need trauma-focused work.

B6. Grounding, regulation and dissociation

• Purpose: Equip clients who dissociate or freeze to stay present, and to notice overwhelm earlier. Dissociation can limit recall, and patients may not recognise their own signs of overwhelm. [source: Stirling et al.]
• Steps: (1) Teach two or three portable grounding skills (orienting to the room, naming objects, feet on the floor, slow even breathing). (2) Build interoceptive and body awareness gradually, moving towards and away from difficult sensation (the titration and pendulation approach the physiotherapy literature also describes). [source: Stirling et al.] (3) Agree how the client will signal and recover if they freeze; in the physiotherapy literature, clinicians respond by sitting the patient up, reorienting them to the room and offering pen and paper. [source: Stirling et al.] (4) Practise in session until reliable.
• Example language (illustrative): "If you notice yourself going far away, try looking around and naming three things you can see. You can also ask to sit up."
• Watch for: Flashbacks, numbness or memory gaps after appointments, which point to trauma-focused therapy.

B7. Psychological care for pelvic pain and penetration difficulties alongside physiotherapy

• Purpose: Pelvic pain, painful sex and vaginismus (genito-pelvic pain/penetration disorder) involve a fear–tension–pain cycle; physiotherapy addresses the muscles while psychological care addresses fear, avoidance, trauma and relationships. [source: Modesto et al. 2025 for the cycle and integrated care; treatment components below are [synthesis]]
• Steps: (1) Assess pain, fear, avoidance, sexual function, relationship context and trauma history, with the client's consent. (2) Provide pain psychoeducation (pain is real and influenced by fear and threat). (3) Use your established evidence-based model: CBT for pain and fear-avoidance, sex-therapy approaches, mindfulness, or trauma-focused therapy (e.g. trauma-focused CBT or EMDR) where PTSD is present. (4) Agree with the physiotherapist who leads which part; graded physical or intimate work stays with the physiotherapist. (5) Include a partner where wanted and appropriate. [synthesis]
• Example language (illustrative): "Your body has learned to brace to protect you. The physio will work with the muscles, and we'll work on the fear and memories that keep the bracing going."
• Watch for: Pressure from a partner to resume sex, which can undermine both treatments; coercion or abuse in the relationship, which needs safety assessment.

B8. Coordinating with the physiotherapist or continence team

• Purpose: Joined-up care that does not overload the client or breach confidentiality.
• Steps: (1) Get written consent for what may be shared, with whom, and for how long. (2) With consent, share what helps care: preferred stop signal, triggers, need for a chaperone, preference for external or surface approaches, pacing. Do not share trauma detail the client has not agreed to. (3) Ask the team about the planned approach and review points so you can time your support. (4) Agree who the client contacts with physical concerns (the team) and with emotional distress (you). (5) Where the team lacks trauma training, the literature describes referral to a pelvic-health physiotherapist with specialist sexual trauma training. [source: Stirling et al. for step 5; the rest [synthesis]]
• Example language (illustrative): "Would it help if I wrote a short note to your physio about the signal you'd like to use and your preference for starting with external methods?"
• Watch for: Role confusion; clients relaying physical questions to you.

B9. Supporting home practice and adherence

• Purpose: Training works through regular practice over months. [source: GPnotebook summary of NICE 2021; Kent Community Health NHS 2025]
• Steps: (1) Ask what the team asked of them and how it is going; do not change the programme. (2) Explore barriers: privacy, time, discomfort, low mood, shame, hopelessness. (3) Use motivational interviewing for ambivalence and behavioural activation or habit-linking for routine. (4) Encourage the client to take difficulties back to the physiotherapist. [synthesis]
• Example language (illustrative): "What gets in the way of the practice the physio suggested? Would it help to raise that with them at your next review?"
• Watch for: Over-practice, compulsive checking or perfectionism; under-practice driven by avoidance.

B10. Debriefing after assessment or sessions

• Purpose: Process the experience, consolidate a sense of control and catch trauma reactions early. [synthesis]
• Steps: (1) Ask what went well and what was hard. (2) Did the stop signal, chaperone or alternatives work? (3) Note body memories, nightmares or avoidance. (4) Revise the plan with the client and, with consent, feed back to the team.
• Example language (illustrative): "What helped you feel in charge at the appointment, and what would you want to be different next time?"
• Watch for: A client who feels they "failed" by stopping: reframe stopping as using their rights.

B11. Safety and crisis responses

• Purpose: Pelvic-health appointments can trigger memories of sexual assault and sometimes new disclosures. [source: Oxford University Hospitals 2022 lists these sensitivities; responses below are [synthesis]]
• Steps: (1) Assess current risk of suicide and self-harm using your service's standard approach if distress spikes. (2) Update the safety plan. (3) If there is a disclosure of current abuse, or a risk to a child or adult at risk, follow local safeguarding procedures. (4) Offer trauma-focused therapy or specialist sexual violence services.
• Watch for: Distress that appears days after the appointment.
• Example language (illustrative): "You're safe here, and you don't have to say more than you want to. Can we check how you're doing right now and what would help tonight?" [synthesis]

B12. Generalisation and ending

• Purpose: Carry gains into daily life and end both treatments well.
• Steps: (1) Review changes in symptoms, confidence, intimacy and avoidance. (2) Plan for setbacks (e.g. pregnancy, menopause, illness): know how to re-contact the pelvic-health service. (3) Mark the client's work in staying in charge of their care. (4) Decide whether further trauma or sexual therapy is needed after physiotherapy discharge. [synthesis]
• Example language (illustrative): "If symptoms come back, what would you do, and who would you contact first?"
• Watch for: gains that rely on your support alone; plan how the client keeps practising and whom they contact if symptoms return. [synthesis]

5. Handling problems

• Client refuses any intimate assessment. Treatment can still go ahead with clothed observation and exercise teaching; external, surface or ultrasound approaches may be offered [source: Oxford University Hospitals 2022; Kent Community Health NHS 2025; Stirling et al.]. Your response: confirm the refusal is legitimate, help the client tell the team, and explore later if they wish, without pushing. [synthesis]
• Client froze or could not stop a procedure. Validate; explain tonic immobility as an automatic survival response, not consent [source: Stirling et al.]. Assess for trauma reactions; with consent, help the client tell the team what happened and agree a non-verbal signal and slower pacing. If the client feels a clinician acted without consent, support them to use the service's complaints or patient advice route. [synthesis]
• Rupture with the physiotherapist or the service. Help the client name what went wrong, decide whether to request a different clinician (including one with sexual-trauma training) or a chaperone, and rebuild trust step by step. [source: Stirling et al. for specialist referral; rest [synthesis]]
• Overwhelm or dissociation in sessions. Return to grounding (B6); slow the pace of preparation; consider trauma-focused therapy before further pelvic-health appointments if symptoms are severe, in agreement with client and team. [synthesis]
• Stuck: the client cannot feel the contraction and becomes hopeless. This group is exactly where NICE keeps biofeedback as an option [source: NIHR Evidence; GPnotebook summary of NICE 2021]. Encourage the client to raise it at review; work on hopelessness and self-blame. [synthesis]
• Non-adherence to home practice. Use B9; look for depression, shame, privacy problems and practical barriers, and encourage honest feedback to the team. [synthesis]
• Client asks you to explain or coach the technique. Decline kindly, explain scope, and help prepare questions for the physiotherapist. [synthesis]
• Client wants to buy a home device or app. Encourage them to discuss it with the pelvic-health team first; the guideline position does not support routine biofeedback, and unsupervised use can reinforce wrong technique. [source: NIHR Evidence for the guideline position; the advice is [synthesis]]
• Pain, sexual difficulties or relationship strain persist after physiotherapy. Continue or start psychological or sex therapy (B7); refer back to the GP if physical symptoms persist. [synthesis]
• Partner pressure, coercion or abuse. Assess safety; follow safeguarding procedures; do not support resumption of sex under pressure. [synthesis]
• Your own discomfort with intimate material. Use supervision; vicarious trauma is recognised in this field. [source: Stirling et al.]
• Cultural or religious concerns (e.g. about examinations, the clinician's sex, menstruation or virginity). Help the client ask for a clinician of a preferred sex where available, a chaperone of their choice, or external approaches. [synthesis]

Sources

Online sources:

• Arnold Henry Kegel (1894–1972), Embryo Project Encyclopedia (Johnson, 2024)
• No benefit from biofeedback with pelvic floor muscle training, NIHR Evidence alert (OPAL trial)
• NICE NG123: Urinary incontinence and pelvic organ prolapse in women: management, overview page (recommendation text not verified)
• NICE guidance: pelvic floor muscle training if pelvic floor dysfunction, GPnotebook
• Biofeedback for the pelvic floor, Kent Community Health NHS Foundation Trust (2025)
• Having an intimate examination, Oxford University Hospitals NHS Foundation Trust, Women's and Men's Health Physiotherapy (2022)
• Stirling J, Wallace Z, James A, Shackel R, Elliott J. Trauma-informed management of patients with prior sexual trauma in pelvic health physiotherapy clinical practice. CSIRO Publishing (Continence journal, vol. 31(1), CJ24042) [year and journal name uncertain]
• Modesto WO, Teixeira BL, Bardin MG (2025). A sensitive practice framework for treating genitopelvic pain in women with sexual trauma. Fisioterapia em Movimento 38:e38136
• Biofeedback Certification International Alliance, Wikipedia (secondary)

Cited, not verified directly:

• Kegel AH (1948). Progressive resistance exercise in the functional restoration of the perineal muscles. American Journal of Obstetrics and Gynecology 56:238–48 (details as given by the Embryo Project).
• NICE (2019). NG123 Urinary incontinence and pelvic organ prolapse in women: management; NICE (2021). Pelvic floor dysfunction: prevention and non-surgical management (exact recommendation wording [uncertain]).