Physio Acoustic Therapy

1. Introduction

Version followed: the Physioacoustic (PA) method as delivered inside the Finnish vibroacoustic therapy (VAT) clinical-process model described by Punkanen and Ala-Ruona (2012, University of Jyväskylä / Eino Roiha Institute). The PA-specific device features (frequency range, scanning, pulsation, direction of the vibration) come from secondary descriptions (Boyd-Brewer 2003; Kantor et al. 2022). Lehikoinen's own chapter, "The Physioacoustic method" (1997, in Wigram & Dileo, Music Vibration and Health), is not available as a legitimate public copy, and no public manufacturer (Next Wave) documentation exists to cite [uncertain]. Device settings are deliberately not given in this guide: programme names, presets and control values belong to the manufacturer's documentation and training. No PA-specific contraindication list has been published in an accessible source; section 5.1 gives the general vibroacoustic precautions that clinics publish, marked as such. Sources support: Lehikoinen as the originator, a 1970s origin as one secondary source gives it, the PA device's general control features, and the absence of any Cochrane review and of any systematic or scoping review up to Kantor et al.'s 2022 search. Still unverified [uncertain]: the founding year of Next Wave Oy, the exact year the method began, a PA-specific contraindication list, and the device's US regulatory class.

What it is. A low-frequency sound treatment in which sinusoidal (single-frequency, no-harmonic) sound waves are played through loudspeakers built into a chair, so that the client feels the sound as vibration through the body. It belongs to the vibroacoustic family begun by Olav Skille and Juliette Alvin (basic idea 1968), which Skille in 1982 defined as rhythmic sinusoidal low-frequency sound (30–120 Hz), mixed with music [source: Punkanen & Ala-Ruona 2012]. In the PA form, the sinusoidal tones lie between about 27 and 113 Hz and are combined with specially selected listening music [source: Boyd-Brewer 2003].
Founder and place. Boyd-Brewer credits Petri Lehikoinen, a Finnish clinical psychologist she places at Helsinki University, with creating the physioacoustic method in the 1970s. She gives no exact year [source: Boyd-Brewer 2003; exact year uncertain]. Wikipedia also attributes physioacoustic therapy to Lehikoinen in Finland, citing the International Dictionary of Music Therapy (2013). It names a Skille-Lehikoinen Centre for Vibroacoustic Therapy and Research [source: Wikipedia, Vibroacoustic therapy]. A Nordic Journal of Music Therapy archival obituary is titled "Petri Lehikoinen (1940-2001)" [uncertain: title only]. Punkanen and Ala-Ruona name Lehikoinen as one of the field's pioneers and describe the Finnish "Nextwave" device as a physioacoustic chair [source: Punkanen & Ala-Ruona 2012]. In published VAT pain studies, the Next Wave Physioacoustic Chair was the device used most often [source: Kantor et al. 2022]. His earlier work includes "The KANSA project", an unpublished 1988 report of a controlled study of vibroacoustic treatment for stress [source: Hooper 2001 reference list; uncertain]. The founding year of the manufacturer, Next Wave Oy, is unverified [uncertain].
How change is thought to happen. Low frequencies are said to act on the body because they resonate with the body's and organs' natural frequencies, which lie mainly below 113 Hz [source: Hytönen 2012 abstract]. The PA rationale rests on sympathetic resonance: frequencies are scanned above and below the approximate resonant frequency of the target muscles [source: Boyd-Brewer 2003]. Sweeping the frequency ("scanning") is meant to find the tone that resonates with a given body area, and each muscle reached this way is said to relax more deeply. Slow pulsation is used to calm and faster pulsation to activate [source: Punkanen & Ala-Ruona 2012]. In the Finnish clinical model, the bodily experience is then put into words. Through this reflection, the client links sensations, images, emotions and memories to their current life [source: Punkanen & Ala-Ruona 2012]. These are the tradition's own explanations, not established mechanisms [synthesis].
Status (medical-adjunct rule). PA is an adjunct within medical, rehabilitation or psychotherapy care. It never replaces medical treatment for pain, spasticity, sleep disorders, cardiac or surgical conditions. Evidence status, as sources give it:
- No Cochrane review of PA or VAT was found.
- Kantor et al. (2022, BMJ Open) ran the first scoping review of VAT in adults with pain, following JBI methods. Their register and database searches "showed no published or ongoing systematic/scoping review". The review included 20 studies. It concluded that research is "too sparse" to identify which VAT properties help with pain, and it called for randomised trials and for full reporting of frequency, amplitude, pulsation and loudness. It also lists one included study (Janzen et al. 2019) as retracted [source: Kantor et al. 2022].
- Kantor et al. (2019, IJERPH) published an advanced narrative review of VAT in cerebral palsy; its findings are not summarised here [uncertain].
- Whether any systematic review has appeared since early 2022 is unverified [uncertain].
- A Finnish hospital rehabilitation unit reports more than two decades of use and positive Visual Analogue Scale (VAS) outcomes for pain and mood. It notes that no standardised protocols exist and that research has focused on 40 Hz [source: Campbell, Hynynen & Ala-Ruona 2017 abstract].
- Recent PA-chair work includes a single-participant phenomenological pilot: six 20-minute sessions over 15 days in a Next Wave Physioacoustic Chair [source: Mercey & Ahonen 2025 abstract].
- Regulation (US): vibroacoustic devices have been treated as equivalent to therapeutic vibrators (21 CFR 890.5975), which are exempt from premarket notification [source: Wikipedia, citing eCFR]. However, a practitioner page states that the Next Wave chair is FDA 510(k)-cleared as a class II device [source: Foster 2015 practitioner page]. Wikipedia also cites a 510(k) entry, K934886, for a "Next Wave physioacoustic mattress"; that entry is unconfirmed [uncertain]. Neither route involves a premarket review of clinical effectiveness [synthesis].
- No published adverse-event data for PA are known to the writer [uncertain]. Absence of reported harm is not proof of safety [synthesis].
Professional frame. No regulated profession for PA or VAT exists in the sources. In Finland, formal VAT training at the University of Jyväskylä (Eino Roiha Institute) began in autumn 2005: 12 ECTS credits over 7 intensive weekends across 7 months, with experiential client/therapist practice and supervision. A three-level international model totalling 20 ECTS has been proposed: an introduction, then practitioner modules with a certificate, then advanced practitioner, with strands in psychotherapeutically oriented VAT and in trainer/supervisor work [source: Punkanen & Ala-Ruona 2012]. A psychotherapist should complete device-specific and VAT training before using PA. The psychotherapeutic, emotion-processing use belongs to trained music therapists or psychotherapists working within their own registration, for example HCPC-registered music therapists in the UK or AMTA/CBMT in the US. Medical indications such as spasticity, post-operative pain or cardiac patients need the treating medical team's agreement [synthesis].

2. Framework

The sources describe one continuous treatment process, not named phases. Below it is arranged into five working stages [source: Punkanen & Ala-Ruona 2012; stage labels are synthesis].

Stage	Goal	Content and format	Move on when
A. Assessment	Establish problem, baseline, suitability	Qualitative interview plus standardised measures where appropriate (the authors used BDI, HADS-A, RAND-36, CORE); medical screening [screening is synthesis]	Goals agreed; no unresolved medical precautions
B. Planning	Fix goals and dose	Decide number of sessions, session length, content (sound alone, sound plus music, verbal work, other methods) and intensity	Client understands and consents to the plan
C. Familiarisation	Build tolerance and trust	Calm setting, explanation of the procedure; first sound periods can be about 10 minutes, then lengthened gradually	Client tolerates the sound comfortably and reports no adverse effects [criterion: synthesis]
D. Treatment course	Symptom relief and/or psychophysical processing	Typical session 45–60 min: verbal check-in, sound stimulation, reflective discussion	Goals met on VAS or measures, or a planned review point is reached
E. Ending and maintenance	Consolidate, prevent relapse	Review of outcomes; booster periods 2–4 times a year	—

Course length: typically 10–15 sessions, sometimes several dozen [source: Punkanen & Ala-Ruona 2012].
Intensity: from twice daily to once weekly, with greater intensity for more chronic or serious conditions [source: Punkanen & Ala-Ruona 2012].
Parameters in published studies (vibroacoustic, not all PA chair): 40 Hz, 20 min weekly for 3 months (cerebral palsy); 30–80 Hz, 10–20 min (Lundqvist et al.); 30-min sessions 3–5 times weekly for 6 months (frail older adults) [source: Punkanen & Ala-Ruona 2012]. The PA-chair pilot used six 20-minute sessions over 15 days [source: Mercey & Ahonen 2025].
Across adult pain studies, most of them using the Next Wave Physioacoustic Chair, 40 Hz was the most-used frequency and sessions usually lasted 20–45 minutes. Only some studies reported full programme parameters. The reviewers tentatively suggest at least 20 minutes, with daily treatment for acute pain, and stress that effectiveness is not yet established [source: Kantor et al. 2022].
Format: individual, with the client seated in the chair (or lying on a bed or mattress for other VA devices) [source: Punkanen & Ala-Ruona 2012; Hooper 2001 abstract].

3. Guiding principles

Sources: Punkanen & Ala-Ruona 2012 unless marked otherwise.

Treat the whole person, mind and body together. Ask about sensations, images, feelings and memories, not only about symptom scores. Hytönen 2012 likewise concludes that the best results come from also considering the psychological side.
Safety and trust come first. Build the alliance before increasing the dose of sound.
Explain the procedure. Telling the client what will happen lowers anticipatory anxiety and supports adherence.
Individualise the volume. Perceived loudness is subjective, and too much volume causes nausea, disorientation and changes in balance. Start low and adjust to the client's report.
Match pulsation to the goal. Slow, gentle pulsation calms; faster pulsation activates.
Find the resonant frequency. Use scanning to locate the tone that the client feels in the target area.
Music is optional and client-led. Favourite music is often used early and is said to work best for pain relief. Drop music that disturbs the client.
Dose gradually. Begin with short sound periods (around 10 minutes) and lengthen them.
Accept every kind of experience. Encourage reflection and acknowledge the full range of experiences without steering the client.
Integrate. Help the client connect what came up to their current life and personal history.
Know the technology well. Fluency with the device frees your attention for the client.
Regulate yourself. Adapt your own pace, voice and activity to the client's needs and goals.
Measure continuously. Use VAS ratings throughout the course, not only at the start and end.
Observe when words are not available. With autistic clients or clients with intellectual disability, rely on observation and on feedback from nursing or care staff.
Adjunct, not replacement. Coordinate with the client's medical care, and never present PA as a cure for physical disease [synthesis].

4. Intervention inventory

Scope note: the sources describe the VAT/PA process and its building blocks: assessment, programme parameters, music, verbal reflection and monitoring. Secondary sources describe the PA device's controls only in general terms: sinusoidal tones of about 27–113 Hz, scanning around a chosen frequency, pulsation, the direction of the vibration wave along the body, and a software library of stored frequency programmes [source: Boyd-Brewer 2003; Kantor et al. 2022; Foster 2015 practitioner page, uncertain]. The manufacturer's named programmes, factory presets and control settings are not reproduced here: device settings come only from Next Wave's own documentation and training. Where a step is not stated in a source, it is marked [synthesis]. All example language is illustrative.

4.1 Intake assessment and medical screening

Purpose / when: Before the first session. Establish the problem, baseline and suitability.
Steps: (1) Run a full qualitative interview covering the presenting problem, bodily symptoms, sleep, stress, pain history, and past experiences of music and sound [source: Punkanen & Ala-Ruona 2012]. (2) Add standardised measures suited to the goal; the authors name the BDI, HADS-A, RAND-36 and CORE [source: same]. Administer licensed instruments under their own terms. (3) Take a baseline 10-cm VAS for each target symptom, such as pain, tension, anxiety or sleep quality [source: same]. (4) Screen for medical precautions and get the treating clinician's agreement where any apply [synthesis]. (5) Ask about hearing problems, tinnitus, sensitivity to sound or vibration, motion sickness and vertigo, given that excessive volume can cause nausea and balance changes [source for side effects: Punkanen & Ala-Ruona 2012; screening questions are synthesis]. (6) Ask about music or sounds linked to traumatic memories, such as music played during abuse, combat noise, engine or machine rumble, or sounds from a medical procedure [synthesis].
Example language (illustrative): "Some people find low humming sounds soothing. For others they bring back something unpleasant, like engines or a particular place. Is there any sound or music I should avoid with you?"
Watch for: medical issues that need clearance first; trauma linked to vibration, rumbling or being held still in a chair; unrealistic expectations of a cure.

4.2 Treatment planning and goal setting

Purpose / when: After assessment. Agree the goals and the "dose".
Steps: (1) Agree concrete goals with the client, for example less neck tension, easier sleep onset, a calmer baseline, or access to emotions that are hard to reach. (2) Decide the number of sessions (typically 10–15), the length of each session and its contents: sound alone, sound with music, verbal discussion, or other methods. (3) Set the intensity, from twice daily to once weekly, with higher intensity for chronic or serious conditions. (4) Plan review points and possible booster periods [source: Punkanen & Ala-Ruona 2012]. (5) Write the plan down and share it with the referring or medical team [synthesis].
Example language (illustrative): "Let's plan twelve sessions, twice a week. We'll check your neck-pain rating each time and review after the sixth session."
Watch for: plans set by the device rather than by the client's goals; no review point built in.

4.3 Preparing the setting and explaining the procedure

Purpose / when: At the start of every session, and especially the first. Lower anxiety and support adherence.
Steps: (1) Make the room quiet, warm and calm, so the client has time to settle before treatment begins [source: Punkanen & Ala-Ruona 2012]. (2) Explain what will happen: the chair contains speakers, the client will feel and hear low tones, and how long the sound will last [source: same, principle of explanation]. (3) Agree a stop signal, for example raising a hand or saying "stop", and show the client how quickly you can turn the sound down [synthesis]. (4) Help the client into a supported, comfortable position, with no tight clothing and phones or hearing aids out of the way if they are uncomfortable [synthesis; positioning is not specified in the sources]. (5) Check that the floor and the chair are stable and that getting in and out is safe [synthesis].
Example language (illustrative): "You'll feel a gentle humming through the chair, a bit like sitting near a big speaker. You can stop at any moment just by raising your hand."
Watch for: guarded posture, breath-holding, or questions that show fear of the device.

4.4 Pre-sound verbal check-in

Purpose / when: At the opening of each session (the first part of the 45–60 minute structure) [source: Punkanen & Ala-Ruona 2012].
Steps: (1) Ask how the client has been since the last session. (2) Take today's VAS ratings. (3) Choose a focus for today, such as a body area or a theme. (4) Adjust the planned programme to the client's current state, for example calming rather than activating [source: same; step detail synthesis].
Example language (illustrative): "On a line from no tension to the worst tension you can imagine, where is your neck today? And where would you like the sound to work?"
Watch for: new symptoms or medical changes; a crisis that needs talk rather than sound today [synthesis].

4.5 Programme design: combining pulsation, volume and scanning

Purpose / when: Before the sound phase, to fit the stimulus to the goal.
Steps: (1) Remember that VAT programmes are built by combining pulsation length, volume and scanning [source: Punkanen & Ala-Ruona 2012]. In the PA method, the direction of the vibration can also be set (4.8a) [source: Boyd-Brewer 2003]. (2) For relaxation, use slow, peaceful pulsation and fairly gentle vibration. For activation, use faster pulsation [source: Punkanen & Ala-Ruona 2012]. (3) Choose whether to add music (4.9). (4) Use the device's own programme library as taught in the manufacturer's training. Secondary descriptions say the PA software stores frequency programmes and lets the operator change the pulsation strength and the direction of the vibration [source: Boyd-Brewer 2003; Foster 2015 practitioner page, uncertain]. Named presets and their parameters are device settings and are deliberately not given here; take them from the manufacturer's training.
Example language (illustrative): "Today we'll use a slow, rocking pulse to help you wind down."
Watch for: activation programmes used with clients who are already highly aroused or anxious [synthesis].

4.6 Volume calibration and hearing safety

Purpose / when: At the start of every sound phase, and whenever the client's comfort changes.
Steps: (1) Start at a low level and raise it slowly while the client reports what they feel [source: individual adjustment, Punkanen & Ala-Ruona 2012; procedure synthesis]. (2) Stop raising it at the lowest level at which the client clearly feels the vibration in the target area [synthesis]. (3) Lower the volume at once if the client reports nausea, dizziness, disorientation or balance changes [source: Punkanen & Ala-Ruona 2012]. (4) Hearing safety [synthesis]: low-frequency sound is felt as much as heard, so the bodily intensity can mislead you about the airborne sound level. Keep any added music at a comfortable listening level. Do not use earphones at high level. Stop if the client reports ear pain, a feeling of fullness in the ear, or new or worse tinnitus. Take extra care with clients who have tinnitus, hyperacusis or hearing aids. Protect your own hearing during long days in the room.
Example language (illustrative): "Tell me when you can just feel it in your back. That's where we'll stay. If anything feels too strong, even a little queasy, say so and I'll turn it down."
Watch for: pallor, sweating, swallowing or gripping the chair (early signs of nausea or disorientation); unsteadiness when the client stands up afterwards.

4.7 Scanning for the resonant frequency

Purpose / when: When working on a specific body area, such as a tense muscle group or a painful region.
Steps: (1) Run a frequency sweep. The PA method scans above and below the approximate resonant frequency of the target muscles, so that the desired frequency is reached many times within one session [source: Boyd-Brewer 2003; Punkanen & Ala-Ruona 2012]. Kantor et al. describe this as a "scanning/radar-like effect" around a focal frequency, intended to avoid numbness [source: Kantor et al. 2022]. (2) Ask the client where they feel the vibration as it moves through the body, or watch for signs of relaxation in the target area [step detail synthesis]. (3) Note the frequency that resonates with the target area and use it, or a narrow sweep around it, in the programme [source: scanning finds the frequency that resonates with the affected area; Punkanen & Ala-Ruona 2012]. (4) Record the frequency that worked, for later sessions [synthesis].
Example language (illustrative): "The tone will slowly change. Tell me when you feel it most in your shoulders."
Watch for: the client feeling the vibration mainly in the head or chest when that is uncomfortable for them; numbness or pins and needles in the target area, which is the effect scanning is meant to avoid (lower the volume or widen the sweep) [response: synthesis]. Deeper relaxation in the target muscles is the sign that it is working.

4.8 Pulsation choice: calming versus activating

Purpose / when: To match the stimulus to the arousal goal.
Steps: (1) Know what pulsation is: in the PA method it means alternating periods of stronger and weaker vibration. The method introduced it to reduce overstimulation, because long, steady stimulation may cause muscle contractions [source: Boyd-Brewer 2003]. (2) For stress, insomnia, high arousal or pain, choose slow pulsation and gentle vibration. (3) For low energy or low muscle tone, consider faster pulsation [source: Punkanen & Ala-Ruona 2012]. (4) Re-check arousal after the sound and adjust next time [synthesis].
Example language (illustrative): "Did that rhythm feel slow enough to let go, or did it keep you alert?"
Watch for: restlessness or agitation with faster pulsation; muscle twitching or cramping with steady, unpulsed stimulation; drowsiness or sleep with slow pulsation, which is fine unless the client has to drive soon [synthesis].

4.8a Direction of the vibration wave

Purpose / when: To use the PA device's ability to move the vibration along the body, when the programme includes it.
Steps: (1) Know the feature: in the PA method, the vibration moves from one transducer to the next, so the client feels it as a wave travelling up or down the body [source: Boyd-Brewer 2003]. A practitioner page says the sound can be directed from bottom to top or the reverse, and claims that this stimulates blood and lymph circulation. That claim is the vendor tradition's own and is unverified [source: Foster 2015 practitioner page; uncertain]. (2) Select the direction only through the device's own programmes, as taught in manufacturer training; settings are not given here. (3) Ask the client how the direction feels. Some clients find an upward wave activating and a downward wave settling, so let the client's report decide [synthesis]. (4) Do not present circulation effects as a medical treatment [synthesis].
Example language (illustrative): "You may feel the hum travel along your back. Does it feel better moving up or moving down?"
Watch for: discomfort or a pulling sensation as the wave passes an injured or post-operative area; light-headedness [synthesis].

4.9 Combining sound with music

Purpose / when: To deepen relaxation, support pain relief, or open emotional material. Use it as an option, not a default.
Steps: (1) Decide with the client whether music is used at all. (2) Choose its character: entertaining, relaxing or activating [source: Punkanen & Ala-Ruona 2012]. (3) In early sessions, the client's own favourite music is often used, and it is said to work best for pain relief [source: same]. (4) Leave the music out if it disturbs the client [source: same]. (5) Musical trauma triggers [synthesis]: check every track with the client beforehand. Avoid music tied to abuse, loss, war or religious coercion, or to a previous hospital stay. Avoid surprise lyrics. Remember that a strong bass line together with body vibration can intensify a memory. (6) Music that stirs strong emotions needs a careful judgement of whether the client can integrate them at this point [source: Punkanen & Ala-Ruona 2012].
Example language (illustrative): "Would you like music with the vibration today, or just the tone? If a piece starts to feel wrong, tell me and I'll take it away straight away."
Watch for: sudden stillness, tearfulness, startle or dissociation when a piece starts. Fade it out and ground the client (5.3).

4.10 Graduated build-up of sound duration

Purpose / when: In the first sessions, and with anxious, frail, sensory-sensitive or traumatised clients.
Steps: (1) Start with a short sound period of about 10 minutes [source: Punkanen & Ala-Ruona 2012]. (2) Lengthen it over the following sessions as tolerated, towards about 20–30 minutes of sound inside a 45–60 minute session [source for session length: same; build-up increments synthesis]. (3) Hold or shorten it if side effects or distress appear [synthesis].
Example language (illustrative): "Today we'll keep it short, about ten minutes, so you can get to know the feeling."
Watch for: the client reporting a sense of safety and comfort, which is the cue to lengthen.

4.11 Monitoring during the sound phase

Purpose / when: Throughout the sound stimulation.
Steps: (1) Stay in the room and watch breathing, facial expression, muscle tone and movement [synthesis]. (2) Keep talk minimal unless the client speaks or your plan includes it [synthesis]. (3) Check in briefly at agreed points [synthesis]. (4) Adjust the volume, pulsation or music at once if needed (4.6, 4.9) [source for adjustment: Punkanen & Ala-Ruona 2012].
Example language (illustrative): "Just a quick check: is this still comfortable? A nod is enough."
Watch for: slower breathing and loosening of the shoulders or jaw (working); clenching, rapid breathing, crying or a vacant look (see 5.3).

4.12 Post-sound reflective discussion on four levels

Purpose / when: In the closing part of every session. Turn the bodily experience into meaning.
Steps: (1) Allow a few quiet moments after the sound stops [synthesis]. (2) Invite reflection on four levels: thoughts and memories (cognitive), images (symbolic), emotions (emotional) and bodily sensations (sensorimotor) [source: Punkanen & Ala-Ruona 2012]. (3) Encourage reflection and accept whatever range of experiences the client brings [source: same]. (4) Take the post-session VAS ratings [source: same]. (5) Check that the client is steady when standing up before they leave [synthesis].
Example language (illustrative): "What did you notice in your body? Did any pictures or memories come? And how are you feeling now, as you sit here?"
Watch for: reports of new body awareness, less pain or tension, calm or mental clarity, all of which the PA-chair pilot reported [source: Mercey & Ahonen 2025 abstract]. Also watch for material too raw to leave unprocessed (5.3).

4.13 Integration into current life and personal history

Purpose / when: Across the course, especially in psychotherapeutically oriented work.
Steps: (1) Link what emerged in sessions to the client's present situation and history [source: Punkanen & Ala-Ruona 2012]. (2) Agree on small ways to carry the experience into daily life, such as noticing tension or using a calming cue at bedtime [synthesis; the sources do not describe homework].
Example language (illustrative): "You said the vibration felt like 'being held'. Where in your life do you get that, and where is it missing?"
Watch for: over-interpretation. Keep meanings the client's own.

4.14 Observational monitoring for clients who cannot report verbally

Purpose / when: With autistic clients, clients with intellectual or profound disability, Rett syndrome or cerebral palsy, as in the research populations listed by the authors.
Steps: (1) Rely on observation and on feedback from nursing or care staff [source: Punkanen & Ala-Ruona 2012]. (2) Build an individual sign profile with carers before starting: how this person shows comfort, discomfort, pain and fatigue [synthesis]. (3) Keep the volume low and the first sessions short [synthesis]. (4) Get consent from the person or their legal representative and assent from the person, and stop at signs of dissent [synthesis].
Example language (illustrative, to carers): "Could you tell me how he usually shows he's uncomfortable, and could you note his sleep and behaviour on treatment days?"
Watch for: changes in challenging behaviour, muscle tone or sleep reported by staff.

4.15 Continuous outcome monitoring with VAS and measures

Purpose / when: Every session.
Steps: (1) Collect 10-cm VAS ratings before and after each session for each target symptom, throughout the course rather than only at the start and end [source: Punkanen & Ala-Ruona 2012]. (2) Repeat the standardised measures at review points [source: same]. (3) Chart the trend and review it with the client [synthesis].
Watch for: relief that lasts only within the session versus change that persists between sessions [synthesis].

4.16 Booster and maintenance periods

Purpose / when: After a successful course, for chronic or recurrent problems.
Steps: (1) Plan booster periods 2–4 times a year [source: Punkanen & Ala-Ruona 2012]. (2) Re-take the baseline VAS at the start of each booster period [synthesis].
Example language (illustrative): "Let's book a short top-up block in the spring, before your usual winter flare."

4.17 Psychotherapeutically oriented PA/VAT

Purpose / when: When the aim is emotional access and processing, not only symptom relief. Examples include the Finnish use in drug rehabilitation combined with music therapy [source: Punkanen & Ala-Ruona 2012; Punkanen 2002 thesis, title and keywords only: altered states of consciousness, psychodynamics, experiencing].
Steps: (1) Use the full session structure: verbal check-in, sound with or without music, then four-level reflection (4.4, 4.9, 4.12). (2) Treat images, memories and altered states that arise as therapeutic material within your own psychotherapy model [source for this orientation: Punkanen & Ala-Ruona 2012; the detailed method in Punkanen 2002 is not summarised here, uncertain]. (3) Reserve this use for trained music therapists or psychotherapists with VAT training. The proposed training model treats it as a specialised strand [source: same].
Example language (illustrative): "Stay with that picture for a moment. What does it feel like from inside it?"
Watch for: altered states sliding into dissociation; with clients in addiction recovery, experiences that resemble intoxication and may be craving cues [synthesis].

5. Handling problems

The sources give only volume adjustment, omitting disturbing music, and sensitive assessment of emotional integration. Everything else below is marked [synthesis].

5.1 Medical precautions and contraindications

No contraindication list from the manufacturer (Next Wave) or from PA clinical studies has been published in an accessible source [uncertain]. Boyd-Brewer reports that "some contraindications have been experienced" with low-frequency systems, citing Lehikoinen 1997 and Wigram 1997, but does not say what they are [source: Boyd-Brewer 2003]. The 2022 scoping review of VAT for pain does not discuss contraindications, adverse effects or safety [source: Kantor et al. 2022]. Punkanen and Ala-Ruona give no list either [source: Punkanen & Ala-Ruona 2012]. A medical centre offering mattress-based vibroacoustic therapy (device not named, not PA-specific) lists as contraindications: extremely high blood pressure, gastric ulcers, acute inflammation, a pacemaker or cardiac arrhythmias, thrombosis risk, kidney, bladder or gall stones, and pregnancy [source: Confido Medical Centre page; not PA-specific, uncertain].
Practical response [synthesis]: treat the conditions above as precautions that need clearance from the treating physician before any session, not as a checklist the therapist can clear alone. Also seek clearance for bleeding risk, unstable cardiac conditions, epilepsy, acute psychosis, and recent fractures, surgery or implants in the area being vibrated. Get written agreement from the medical team in hospital and rehabilitation settings. Published PA use with post-operative, cardiac-surgery and knee-replacement patients took place inside medical care [source: Burke & Thomas 1997 and Butler & Butler 1997, as summarised in Boyd-Brewer 2003 and Kantor et al. 2022].

5.2 Physical side effects (nausea, dizziness, disorientation, balance changes)

Source: these are caused by excessive volume; adjust it individually [source: Punkanen & Ala-Ruona 2012].
Response [synthesis]: turn the volume down or stop. Have the client sit upright with feet on the floor and give water. Let them stand only when steady, and stay with them. Next time use a lower volume and a shorter sound period, and take a slower path through 4.10.

5.3 Overwhelm, emotional flooding, flashback or dissociation

Source: music that activates strong emotions needs sensitive assessment of whether the client can integrate them [source: Punkanen & Ala-Ruona 2012].
Response [synthesis]: fade the music first, then the vibration (do not cut it off abruptly unless the client asks). Use the client's name and orient them to the room, the day and your presence. Invite them to press their feet into the floor, open their eyes and name objects. Validate what happened. Do not push for detail. Close with containment before they leave. Afterwards, remove the trigger (track, frequency range, pulsation), shorten the sound periods, and return to calming programmes and body-focused reflection before going near emotional material again. For trauma clients, treat PA as an adjunct inside a phase-based trauma treatment, not as an exposure method.
Musical trauma triggers [synthesis]: clients may react to particular songs or genres, to bass-heavy rumble (engines, gunfire, earthquakes), to vibration felt through the body, or to the experience of being seated and held still. Screen for these at intake (4.1). Offer silent, sound-only or very low-level options, and let the client keep control of the stop signal.

5.4 Stuck: no change in VAS or symptoms

Response [synthesis]: first check the dose, including session length, frequency and the number of sessions so far (typical courses are 10–15 sessions, with higher intensity for chronic problems) [source for dose ranges: Punkanen & Ala-Ruona 2012]. Re-scan for a better-resonating frequency (4.7). Switch between sound-only and music. Strengthen the verbal reflection (4.12). If there is still no change at the planned review, stop and say so honestly. Do not keep going indefinitely.

5.5 Resistance, scepticism or fear of the device

Response [synthesis]: explain more and demonstrate. Let the client feel the vibration with a hand on the chair first. Start very short (4.10). Offer the session as an experiment, with no promise attached.

5.6 Non-adherence and missed sessions

Response [synthesis]: review whether the intensity of the plan (up to twice daily in the sources) fits the client's life. Discuss what made sessions hard, such as side effects, emotions stirred, or travel. Agree a realistic schedule.

5.7 Ruptures

Response [synthesis]: typical triggers are a session that went too far emotionally, a volume that felt imposed, or music the client disliked. Name the rupture, take responsibility for the setting, and hand control of the volume, music and stop signal back to the client.

5.8 Modality-specific difficulties

Falling asleep [synthesis]: acceptable if sleep is the goal. Plan a waking-up period, and advise against driving straight after if the client feels drowsy.
Expectations of a cure [synthesis]: state plainly that PA is an adjunct. The sources report experiential and VAS-based benefits and no standardised protocols [source: Campbell et al. 2017 abstract].
Children and young people [synthesis]: follow local safeguarding and mandatory-reporting duties. Get parental consent and the child's own assent, and stop at dissent. Keep sessions shorter and volumes lower, and let a parent or carer stay present if that helps. Never read a child's reactions in the chair as evidence of abuse.
Physical safety [synthesis]: make sure the chair is stable and getting in and out is safe, especially for frail or Parkinson's clients. Keep cables out of the way. Follow the manufacturer's electrical and hygiene instructions, including cleaning surfaces between clients.
Spiritual or energy claims [synthesis]: some vendors of vibroacoustic devices pair them with chakra or energy language. Keep to the resonance and relaxation rationale that the tradition itself states, and present it as that tradition's own explanation.

Sources

Sources consulted:

Added in the October 2026 verification pass:

Cited from reference lists [uncertain]:

Lehikoinen, P. (1997). The Physioacoustic method. In Wigram, T. & Dileo, C. (eds), Music Vibration and Health. New Jersey: Jeffrey Books.
Lehikoinen, P. (1988). The KANSA project: report from a controlled study on the effect of vibroacoustical therapy on stress. Unpublished paper.
Burke, M. & Thomas, K. (1997). Use of physioacoustic therapy to reduce pain during physical therapy for total knee replacement patients over age 55. In Wigram & Dileo (eds), Music Vibration and Health.
Butler, C. & Butler, P. J. (1997). Physioacoustic therapy with cardiac surgery patients. In Wigram & Dileo (eds), Music Vibration and Health. (The author's second initial is given as C.J. on the Soundbeam page and P.J. in Hooper's list.)
Skille, O. & Wigram, T. (1995). The effect of music, vocalisation and vibration on brain and muscle tissue: studies in vibroacoustic therapy. In Wigram, Saperston & West (eds), The Art & Science of Music Therapy: A Handbook. London: Harwood.

Further related works [uncertain]: Norlander, T., Sandholm, C. & Anfelt, O. (1998), The Physioacoustic Method and the Creative Process, Perceptual and Motor Skills 86(3), 1091; Kantor, J. et al. (2019), Potential of Vibroacoustic Therapy in Persons with Cerebral Palsy: An Advanced Narrative Review, IJERPH 16(20), 3940; "Petri Lehikoinen (1940-2001)", Nordic Journal of Music Therapy archival obituary (title only); Ala-Ruona, E. (1999, 2003), Finnish-language works on physioacoustic treatment (listed on the VIBRAC research page).

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