What Ultrasound Reveals After 8 Weeks of MNML Tone

A pilot study measuring abdominal fat-layer reduction and rectus abdominis thickening.

In aesthetics, outcomes are often discussed in inches, photos, and “how it feels.” But occasionally, a study arrives that measures what’s happening underneath the skin—layer by layer—using ultrasound. That matters, because ultrasound doesn’t care about lighting, posture, or perception. It simply measures tissue thickness.

In a 2024 prospective pilot study, researchers evaluated an integrated, noninvasive system combining electrical muscle stimulation (EMS), bipolar radiofrequency (RF), and vacuum therapy—technology that maps directly to how MNML Tone is engineered. The clinical question was simple: can you reduce abdominal fat thickness and increase muscle thickness in the same series, without downtime?

This blog translates the publication into provider language, highlights the measurable outcomes, and clarifies what the study does (and does not) prove. Whenever the original paper references the device name, we will refer to it here as MNML Tone.

Why ultrasound matters in body contouring

Visual change can be compelling—but lighting and posture can mislead. Ultrasound adds objectivity by measuring fat and muscle thickness beneath the skin.

The aesthetic industry is full of “before and after” imagery, but images are susceptible to variables: posture, camera distance, lighting, and even breathing. Ultrasound is different.

With a standardized probe position and depth, it can track changes in the subcutaneous adipose tissue (fat layer) and the rectus abdominis (abdominal muscle) over time.

For providers, this matters because it moves the conversation from “Does it look different?” to “Did the tissue actually change?”

That’s the kind of claim you can stand behind—especially when patients are comparing technologies.

Study snapshot

• Design: Prospective, single-center, nonrandomized pilot study (8-week treatment series + 1-month follow-up).

• Participants: 20 healthy adults (15 women, 5 men), ages 28–50, BMI 22–28.

• Treatment plan: 16 total sessions over 8 weeks (two 30-minute sessions per week), targeting the abdomen.

• Outcomes measured: Ultrasound fat thickness + rectus abdominis thickness, waist circumference, body weight/BMI, standardized photography, and patient satisfaction.

What the MNML Tone protocol looked like in this study

Each session used multiple handpieces secured over the abdomen to maintain consistent contact and stability. Treatment combined bipolar RF (1 MHz), EMS, vacuum suction, and cooling protection in a single visit.

The authors used two settings that mirror how providers think clinically: a contouring-focused mode (RF + lower-frequency EMS) and a muscle-toning mode (RF + higher-frequency EMS). Intensity was set between 90% and 110%, and no topical anesthetic was applied.

Hydration was treated as part of protocol: participants were instructed to drink 1 liter of water before treatment and continue hydrating afterward to support lymphatic drainage and circulation.

Table 1. Protocol overview (as reported in the published study)

Protocol element	What the study used
Sessions	16 sessions total over 8 weeks (2 per week)
Session length	30 minutes
Treatment area	Abdomen (rectus abdominis + external obliques targeted)
Energy stack	Bipolar RF (1 MHz) + EMS + vacuum + cooling protection
Temperature control	Epidermis held at 43°C; deeper tissues up to 45°C
Aftercare emphasis	Hydration before/after to support drainage and circulation

This table summarizes treatment structure; device-specific settings should always follow your clinic protocol and manufacturer guidance.

A closer look at safety: controlled heat with cooling support

RF effectiveness is tied to temperature—but patient comfort and epidermal safety are tied to how precisely that temperature is controlled. In this study, integrated sensors monitored skin temperature and impedance in real time. A thermal-imaging camera confirmed uniform dermal warming while the epidermis was stabilized around 43°C via a cooling module.

Figure 1. Thermal imaging during MNML Tone treatment shows uniform dermal warming while epidermal temperature is controlled (FLIR image from the published study).

In practice, this detail matters because it supports a provider-friendly treatment experience: higher tissue impact without asking the patient to “tough it out,” and without extended downtime.

What ultrasound showed: objective tissue change

At one month after the final session, ultrasound documented two things happening at once: the subcutaneous fat layer thinned and the rectus abdominis thickened. Waist circumference also decreased, and there was a modest reduction in weight/BMI.

The study also included ultrasound images captured at multiple timepoints (baseline, immediately after early sessions, and at follow-up), showing progressive thinning of the fat layer and increased muscle thickness in the same patient series.

Figure 2. Serial ultrasound images show changes in subcutaneous fat thickness and rectus abdominis thickness over the treatment series (from the published study).

Table 2. Anthropometric and ultrasonographic measurements (mean values)

Measure	Baseline	1 month post	Change	P value
Rectus abdominis thickness	1.27 cm (0.50 in)	1.51 cm (0.59 in)	+0.24 cm (+0.09 in) / +18.83%	<0.001
Subcutaneous fat thickness	2.32 cm (0.91 in)	1.71 cm (0.67 in)	−0.61 cm (−0.24 in) / −26.27%	<0.001
Waist circumference	72.62 cm (28.59 in)	70.48 cm (27.75 in)	−2.13 cm (−0.84 in) / −2.94%	<0.001
Body weight	68.73 kg (151.52 Lbs)	67.15 kg (148.04 Lbs)	−1.58 kg (−3.48 lb) / −2.30%	0.002
BMI	24.84	24.24	−0.60 / −2.41%	0.003

Inches/pounds are included for readability. Percent change and P values are reported as in the published study.

What patients noticed: satisfaction + downtime

Beyond measurements, patients reported visible contour improvement and perceived skin elasticity changes. Satisfaction remained high across the series and at follow-up.

Operationally, the ‘no downtime’ finding is a major practical advantage. The study reported no adverse events or complications, and participants resumed daily activities immediately after each session.

Table 3. Patient satisfaction distribution

Satisfaction level	After final treatment	1 month after treatment
Slightly improved (<25%)	0 (0%)	0 (0%)
Moderate improvement (25–50%)	2 (10%)	1 (5.5%)
Good improvement (51–75%)	14 (70%)	10 (50%)
Very good improvement (>75%)	4 (20%)	9 (44.5%)

Why the combination matters: the multilayer concept

Many systems are strong at one thing—fat heating, muscle contraction, or surface tightening. The approach in this study is designed to act across layers during the same appointment, which helps explain why ultrasound saw changes in both fat and muscle.

1) RF: targeted thermal support for fat reduction

Bipolar RF is commonly used in noninvasive contouring because it can deliver thermal energy into subcutaneous tissue while preserving the epidermis and deeper muscle.

The study authors describe RF lipolysis as a pathway that releases fatty acids and glycerol, which are then metabolized and cleared through physiologic systems (including lymphatic pathways).

Clinical translation: RF sets the stage by changing the adipose environment and supporting contour refinement—especially when the system can deliver and maintain a controlled temperature range.

2) EMS: contraction-driven muscle challenge

EMS induces repeated, high-intensity muscle contractions, which can stimulate hypertrophy signals and improve muscle thickness over a series. In the paper, the authors describe the synergy: RF elevates muscle temperature and can enhance stimulation conditions, while EMS drives neuromuscular work that can translate into thicker, more activated muscle tissue.

Clinical translation: this is why MNML Tone conversations should include more than “toning.” The measurable endpoint is muscle thickness—not just “feeling sore.”

3) Vacuum: coupling, lift, and lymphatic flow

Vacuum therapy is not just a comfort feature. The study notes that suction lifts tissue, allowing RF heating to penetrate more effectively at depths of roughly 5–25 mm. The authors also describe suction supporting lymphatic flow and the clearance of byproducts—an important piece when you’re asking the body to process lipolysis and cellular debris.

Clinical translation: vacuum can improve consistency (better contact, less slipping) and can support the ‘recovery environment’ by encouraging circulation and drainage.

Practical ways to use this evidence in clinic

If you want to use this study in provider consults or team training, focus on three practical themes: patient selection, measurement, and expectation-setting.

Patient selection: who this data best represents

Participants were healthy adults with BMI 22–28 (mild to moderate abdominal adiposity) and no known metabolic or cardiovascular disease. In other words, this is not an obesity-treatment study. It’s an aesthetic contouring study in an appropriate population for noninvasive shaping.

Measurement: what to track beyond the scale

The most meaningful outcomes here were not scale weight. They were tissue thickness (ultrasound) and waist circumference.

Even if your clinic doesn’t use ultrasound, you can mirror the intent by tracking:

• Waist circumference at the same landmark each visit

• Standardized photos (lighting, distance, posture)

• Patient-reported fit of clothing and abdominal ‘feel’ (tightness, firmness)

• Optional: body composition scans if available

Expectation-setting: series compliance is the treatment

This study used 16 sessions across 8 weeks and assessed outcomes one month later. That timeline can help providers set expectations early: this is a series-based physiologic change, not a single-session cosmetic trick.

What this study does NOT prove

This is where credibility is built. The study is encouraging, but it has standard pilot limitations: small sample size, short follow-up, and no control group. Lifestyle factors were not tightly controlled, so some outcomes could be influenced by diet/activity changes during the study period.

Use it as feasibility and preliminary efficacy evidence—then pair it with your clinic’s internal outcome tracking over time.

Bottom line for the MNML Tone evidence library

This pilot study adds a compelling piece to the MNML Tone clinical narrative: ultrasound-confirmed fat-layer thinning alongside rectus abdominis thickening, paired with high patient satisfaction and minimal downtime. For providers, that combination supports a clear positioning—multilayer contouring that aims to change what patients see and what imaging can measure.

As always, set expectations around series compliance, hydration, and lifestyle support. The next step for the field—and for evidence strength—will be larger, controlled studies with longer follow-up.

Source

Bae K-T, Jung H-W, Lee D-S, Wan J, Yi K-H. Ultrasonographic Measurement After Multilayer Stimulation for Body Fat Reduction and Muscle Strengthening: A Pilot Study. Plast Reconstr Surg Glob Open. 2025;13:e7175. Published online November 11, 2025. doi:10.1097/GOX.0000000000007175.