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— Clinical primer
What P&S Monitoring Measures, and Why Both Branches Matter
Heart rate variability alone cannot separate the two branches of the autonomic nervous system. Here is what independent, simultaneous measurement adds to a clinical picture.
— Clinical primer
What P&S Monitoring Measures, and Why Both Branches Matter
Heart rate variability alone cannot separate the two branches of the autonomic nervous system. Here is what independent, simultaneous measurement adds to a clinical picture.
By the Physio PS clinical team · Published 12 March 2026 · 6 min read
The autonomic nervous system runs on two branches. The parasympathetic branch slows the heart, supports digestion and recovery. The sympathetic branch raises heart rate and blood pressure and mobilises the body under load. Most of the time they work as a pair, and the clinically interesting question is not how active one is, but how the two relate to each other.
By the Physio PS clinical team · Published 12 March 2026 · 6 min read
The autonomic nervous system runs on two branches. The parasympathetic branch slows the heart, supports digestion and recovery. The sympathetic branch raises heart rate and blood pressure and mobilises the body under load. Most of the time they work as a pair, and the clinically interesting question is not how active one is, but how the two relate to each other.
Why a Single Number Is Not Enough
Many tools report an aggregate of autonomic activity. An aggregate can hide the case that matters: normal-looking overall variability produced by a suppressed parasympathetic response and an elevated sympathetic one. Two very different physiologies can present as the same summary figure.
Physio PS measures both parasympathetic and sympathetic branches independently, simultaneously, and quantitatively. That is the capability that separates it from other tools on the market, and it is what lets a medical professional describe the balance between branches rather than infer it.
Why a Single Number Is Not Enough
Many tools report an aggregate of autonomic activity. An aggregate can hide the case that matters: normal-looking overall variability produced by a suppressed parasympathetic response and an elevated sympathetic one. Two very different physiologies can present as the same summary figure.
Physio PS measures both parasympathetic and sympathetic branches independently, simultaneously, and quantitatively. That is the capability that separates it from other tools on the market, and it is what lets a medical professional describe the balance between branches rather than infer it.
What a Session Looks Like
Testing is non-invasive, with an automated assessment and reporting process that generates qualitative, quantitative, and graphical results for medical professional review. The report provides objective information to support clinical assessment and facilitate a discussion with the patient during the same visit. No tilt table is required.
In practice: because the report is automated, the assessment can sit inside an existing intake or follow-up protocol rather than becoming a separate appointment type.
What a Session Looks Like
Testing is non-invasive, with an automated assessment and reporting process that generates qualitative, quantitative, and graphical results for medical professional review. The report provides objective information to support clinical assessment and facilitate a discussion with the patient during the same visit. No tilt table is required.
In practice: because the report is automated, the assessment can sit inside an existing intake or follow-up protocol rather than becoming a separate appointment type.
Where Medical Professionals Use It
Screening for autonomic involvement in patients with diabetes, cardiovascular risk or unexplained fatigue and dizziness.
Baseline and follow-up measurement when a therapy is expected to change autonomic tone.
Biofeedback, recovery coaching and performance work, where branch balance is the outcome being trained.
Research into autonomic dysfunction, cardiac autonomic neuropathy and P&S function.
Where Medical Professionals Use It
Screening for autonomic involvement in patients with diabetes, cardiovascular risk or unexplained fatigue and dizziness.
Baseline and follow-up measurement when a therapy is expected to change autonomic tone.
Biofeedback, recovery coaching and performance work, where branch balance is the outcome being trained.
Research into autonomic dysfunction, cardiac autonomic neuropathy and P&S function.
The Short Version
If a decision depends on which branch is driving a finding, the measurement has to separate them. That is the whole argument for independent, simultaneous P&S monitoring, and the reason the reports give medical professionals something they can act on.
Want to see this in a live session? Book a free demo and we will walk through real reports with an autonomic expert.
✓ FDA 510(k) Cleared ✓ Patented Technology ✓ Backed by Published Research
The Short Version
If a decision depends on which branch is driving a finding, the measurement has to separate them. That is the whole argument for independent, simultaneous P&S monitoring, and the reason the reports give medical professionals something they can act on.
Want to see this in a live session? Book a free demo and we will walk through real reports with an autonomic expert.
✓ FDA 510(k) Cleared ✓ Patented Technology ✓ Backed by Published Research
— Keep reading
DIAGNOSIS · 5 MIN READ
Cardiac Autonomic Neuropathy: The Finding Patients Rarely Feel
— Next Step
Start Where It Makes Sense for You
— Keep reading
DIAGNOSIS · 5 MIN READ
Cardiac Autonomic Neuropathy: The Finding Patients Rarely Feel
— Next Step
Start Where It Makes Sense for You
FDA 510(k) cleared autonomic nervous system monitoring for clinics, home care and research. Serving physicians, clinics and researchers across the United States and worldwide.
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Who We Serve
Journal
Contact
603-287-1817
80 Nashua Rd, Building C, Unit G1, Londonderry, NH 03053
© 2026 Physio PS, Inc. All rights reserved. FDA 510(k) cleared · Patented · Established 2019.
Hours available on request, ask during your demo.
Copyright 2026 Physio PS, Inc. All Rights Reserved.
The material and information provided by Physio PS is for general information purposes only. You should not rely upon this material or information for basis of making healthcare, treatment, or diagnosis decisions. While Physio PS strives to provide the most correct and up-to-date information and data, Physio PS makes no representations or warranties of any kind, expressed or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the information, products, services, or related graphics contained. Any reliance placed on such material is therefore strictly at your own risk. Reporting Information is supplied under license by NCRC LLC. * ‘RFa’ is known to be a measure of Parasympathetic activity and ‘LFa’ is known to be a measure of Sympathetic activity, based on reference: Colombo J, Arora RR, DePace NL, Vinik AI, Clinical Autonomic Dysfunction: Measurement, Indications, Therapies, and Outcomes. Springer Science + Business Media, New York, NY; 2014.
— FAQ
Questions Practices Ask Before They Start
Straight answers on time, cost, clearance and fit.
How long does an assessment take?
A complete autonomic assessment is non-invasive and takes 15 minutes. It is fully automated, and the qualitative, quantitative and graphical reports are delivered without manual interpretation.
Is the technology FDA cleared?
Yes. The platform is FDA 510(k) cleared to U.S. medical device standards, patented, and backed by published research.
How is testing paid for?
The Clinical Monitoring Unit is supported by fundable billing codes. For the other systems, ask about billing code applicability during your demo. Financing options, low monthly payments and veteran-owned discounts are available to qualifying practices.
Do we need extra staff, space or a tilt table?
No. Testing integrates with your existing treatment protocols with no workflow overhaul and no tilt table required. Training and certification are included, so your team is ready from day one.
How is this different from heart rate variability tools?
It is the only solution on the market that measures both parasympathetic and sympathetic branches independently, simultaneously and quantitatively, rather than reporting one blended figure.
Which system fits my practice?
The CMU is a desktop system for clinics, the RMU is tablet-based and battery-powered for home care and sports medicine, and the PAL is laptop-based for medical professionals who move between facilities. A free demo is the quickest way to find the right configuration.
How do I become a distributor?
Tell us about your territory and the clinics you work with through the distributor enquiry form, or call 603-287-1817, and the team will follow up to discuss distribution.
FDA 510(k) cleared autonomic nervous system monitoring for clinics, home care and research. Serving physicians, clinics and researchers across the United States and worldwide.
Site
Who We Serve
Journal
Contact
603-287-1817
80 Nashua Rd, Building C, Unit G1, Londonderry, NH 03053
© 2026 Physio PS, Inc. All rights reserved.
FDA 510(k) cleared · Patented · Established 2019.
Hours available on request, ask during your demo.
Copyright 2026 Physio PS, Inc. All Rights Reserved.
The material and information provided by Physio PS is for general information purposes only. You should not rely upon this material or information for basis of making healthcare, treatment, or diagnosis decisions. While Physio PS strives to provide the most correct and up-to-date information and data, Physio PS makes no representations or warranties of any kind, expressed or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the information, products, services, or related graphics contained. Any reliance placed on such material is therefore strictly at your own risk. Reporting Information is supplied under license by NCRC LLC. * ‘RFa’ is known to be a measure of Parasympathetic activity and ‘LFa’ is known to be a measure of Sympathetic activity, based on reference: Colombo J, Arora RR, DePace NL, Vinik AI, Clinical Autonomic Dysfunction: Measurement, Indications, Therapies, and Outcomes. Springer Science + Business Media, New York, NY; 2014.