Power and Delivery in Facial EMS, Two Different Questions
Medically reviewed by
4 independent reviewers
Andrew Conrad Barile, PT, DPT
Doctor of Physical Therapy (DPT) | Licensed Physical Therapist (PT) | CEO and Founder, Xtreem Pulse LLC
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Dr. Andrew Conrad Barile is a Doctor of Physical Therapy and the CEO and Founder of Xtreem Pulse LLC, the engineering company behind PureLift. He earned his Doctorate in Physical Therapy from Daemen College and is a licensed physical therapist.
He brings over two decades of clinical and entrepreneurial experience across physical therapy, craniosacral therapy and medical device innovation, built on a working knowledge of human anatomy and muscle physiology.
For PureLift LAB he reviews how current is delivered across all ten levels, from sub-sensory nanocurrent and skin-level microcurrent to motor-level EMS, and how the Infuse pass fits into the same ten-minute routine.
Bertica M. Rubio, M.D.
Board-Certified Physician, Dartmouth Medical School | Medical Director, Antiaging Regenerative Medicine Clinic
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Dr. Bertica M. Rubio is a board-certified physician and Medical Director of the Antiaging Regenerative Medicine Clinic in Redlands, California. She earned her Doctor of Medicine from Dartmouth Medical School and completed her pediatrics residency at UC Irvine Medical Center.
With decades of clinical experience, she specialises in age management medicine, regenerative medicine, wound healing and growth factor therapies, and her practice integrates evidence-based medical science with advanced aesthetic treatment.
For PureLift LAB she reviews articles for medical accuracy across the whole dial, from the gentle nanocurrent and microcurrent settings through to muscle-level EMS and the Infuse pass.
Daniel Grinberg, MD, FACS
Board-Certified Otolaryngologist | Head and Neck Surgeon | Fellow, American College of Surgeons | Mount Sinai
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Daniel Grinberg, MD, FACS is a board-certified otolaryngologist and head and neck surgeon at ENT and Allergy Associates in West Nyack, New York. He earned his medical degree from Columbia University College of Physicians and Surgeons.
He completed his otolaryngology residency at New York University Medical Center, serves as Assistant Clinical Professor at Mount Sinai School of Medicine, and is a Fellow of both the American College of Surgeons and the American Academy of Otolaryngology.
For PureLift LAB he brings a wider clinical lens, connecting at-home facial stimulation from microcurrent to EMS to the anatomy underneath, with the same rigour we apply to every device specification.
Prof. Dr. med. Ivo Buschmann
Chair of Angiology, Medizinische Hochschule Brandenburg | Clinic Director, University Clinic for Angiology
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Prof. Dr. med. Ivo Buschmann is Chair of Angiology at the Medizinische Hochschule Brandenburg Theodor Fontane and Clinic Director of the University Clinic for Angiology at the Brandenburg University Hospital.
He trained at the University of Hamburg, was a Max Planck Society Fellow at the Max Planck Institute for Heart and Lung Research, and held senior consultant posts at the Charite Universitatsmedizin Berlin before his appointment as Chair in 2016.
One of Europe's leading authorities on arteriogenesis, with over 150 peer-reviewed publications and US and EU patents, he reviews for PureLift LAB how the evidence on electrical stimulation is read and where its limits lie.
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Power is how much current a device can deliver; delivery is how that current is organised over time, and the two answer different questions.
This article covers what actually decides the answer, such as:
- Power is a threshold question
- The ceiling is not a target
- Delivery is a fatigue question
- PDM++ is the second delivery layer
- Reading a spec sheet properly
and many more!
A device can be strong and unpleasant, or gentle and well organised, and the spec sheet only tells you which if you read both numbers.
Key Points:
Current is measured in milliamps, and the motor threshold is the point at which a nerve fires a muscle.
Microcurrent devices publish figures in the hundreds of microamps, which is thousandths of a milliamp, so no setting reaches contraction.
PureLift Face and Pro reach 7 mA at 500 ohms, Pro Edition 7.7 mA, and Pro Plus and GLOW 9 mA.
PDM cycles through 361 frequency points between 1,370 and 1,730 Hz rather than holding one frequency, which is the delivery half of the answer.
A maximum figure is a ceiling, not an instruction; most people work below it.
Power is a threshold question
Ward's work sets out three thresholds as current rises: sub-sensory, where nothing is felt, sensory, where you feel a tingle, and motor, where the muscle contracts (PMID 19095805). Those thresholds are why the milliamp figure matters at all; it is not about being stronger for its own sake, it is about whether the device can reach the band you are trying to work in.
A device that publishes 309 microamps or 680 microamps is publishing a figure below the motor threshold, and that is a design decision rather than a defect. It just means muscle contraction is not on the menu at any setting.
PureLift puts the bands on one dial. Levels 1 and 2 are nanocurrent and microcurrent, level 3 is where the motor threshold is crossed, and levels 3 to 10 are EMS. Face and Pro reach 7 mA at 500 ohms with a 4 microsecond pulse width, Pro Edition 7.7 mA, Pro Plus and GLOW 9 mA.
The ceiling is not a target
A maximum output figure describes what the device can do under specified conditions, not what you should be doing. Contact, placement, how wet the serum is, and your own tolerance all change what a given level feels like, and the same number on two different faces is two different experiences.
Working at the highest level you can stand is not a strategy; the muscle does not respond better to being punished, and a level you dread is a level you skip.
Delivery is a fatigue question
Hold a nerve at one fixed frequency and it accommodates; the response falls off while the current stays the same, and the session gets less comfortable as it goes. Vary the frequency and that decline is delayed.
PDM, Pulsed Dynamic Modulation, is PureLift's implementation: 361 frequency points between 1,370 and 1,730 Hz, cycled rather than fixed. Downey and colleagues tested a modulation strategy in a neuromuscular stimulation protocol and found frequency variation extended a defined endpoint against constant frequency (PMID 21996798). Papaiordanidou and colleagues report a case where modulation did not help, and it is worth reading alongside (10.1371/journal.pone.0084740).
That is category evidence about the principle. It was not run on a PureLift and it does not promise you a particular sensation.
PDM++ is the second delivery layer
Pro Plus and GLOW add PDM++, a bipolar pulse that builds and releases charge gradually rather than switching abruptly. The intent is that the same power lands more smoothly, and the practical consequence is that a level which feels sharp on a simpler waveform can feel workable here.
Whether it feels smoother to you is still a personal matter; architecture is a reason to expect something, not proof of it.
Reading a spec sheet properly
Ask for the current figure and the load it was measured at, because milliamps without an impedance figure is half a number. Ask for the pulse width. Ask whether the frequency is fixed or varied. A brand that publishes all three is telling you something; a brand that publishes none is asking for trust instead.
Maffiuletti's work makes the wider point that a dial setting is not the same as the tension actually evoked in the muscle (PMID 29233625), which is why comparing two devices by their level numbers is meaningless.
What the trust signals do and do not tell you
PureLift devices are cleared 510(k) Class II: Face under K190269, Pro and Pro Edition under K230506, Pro Plus under K221443, and GLOW under K243587. Clearance is regulatory status for stated intended uses, not a verdict on comfort or a promise of a result.
They are made in Japan in an ISO 13485 facility by a company that has made facial stimulation devices, and nothing else, since 1987. That is manufacturing context; it tells you about consistency rather than about outcomes.
Which model the two questions point to
If you want the strongest output without light, Pro Plus at 9 mA with PDM++ and the diamond-faceted probe is the answer. If you want light as well, GLOW adds red at 634 nm and blue at 465 nm.
If 7 mA is plenty, and for most people starting out it is, Face is the same PDM engine in a compact handheld and Pro is the same output in a slim professional pen.
For the full breakdown, see how the nine PureLift technologies work, and for the comfort side specifically, modulated versus fixed frequency EMS.