Quick Overview
Doctors in New York reviewed 20 studies on muscle stimulation, covering 521 people. Their 2022 paper ran in Dermatologic Surgery, published by Wolters Kluwer in the United States. Teams at Hofstra/Northwell and UnionDerm graded the proof. MRI, CT, and ultrasound measured the change. On the abdomen, muscle thickness rose about 15 to 21 percent. Fat thickness fell about 15 to 20 percent. Some of that change lasted one year. Postpartum women showed a smaller muscle gap. Arms and calves thickened too. The scans suggest this stimulation can help people seeking a firmer abdomen, arms, or calves. EMS may offer similar support, and other groups and goals may benefit too. The full post has every figure.
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Scientists in New York Checked 20 Studies on Muscle Stimulation. Here Is What the Scans Measured.
A team of doctors wanted a clear answer. Does muscle stimulation change the body in ways a scan can see? They did not guess. They read the studies. Then they graded the proof.
The review was led by Dr Pooja H. Rambhia. She works at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, in New York. Dr Nkem Ugonabo and Dr Anne Chapas, of UnionDerm in New York, worked with her. Louise Turner also joined the team.
Their paper was published in October 2022. It appeared in Dermatologic Surgery. That is the journal of the American Society for Dermatologic Surgery. The publisher is Wolters Kluwer, in the United States. America has a long record of medical research. This was a formal review, not a blog opinion.
They searched PubMed and Embase up to 12 December 2021. They followed a PRISMA plan. They kept only human studies in English. They scored each study with the GRADE scale. That scale rates how strong the proof is.
They kept 20 studies. Those studies covered 521 people. Nine studies were moderate quality. Eight were low quality. Three were very low quality. The abdomen had the strongest set of proof.
The main method in these studies was electromagnetic muscle stimulation. A pad sends a strong magnetic field into the muscle. The field fires the motor nerves. The muscle then contracts on its own. The contractions are harder than a normal workout. Most sessions lasted 30 minutes. No anaesthetic was used.
The paper also looked at electrical muscle stimulation, called EMS. EMS sends current through pads on the skin. The doctors said EMS is used less often in beauty medicine. They said more EMS studies are still needed. The numbers below come from the electromagnetic studies in this review.
Abdomen: the clearest measured gains
Fifteen studies looked at the abdomen. That was 378 people. Seven of those studies were moderate quality. On that proof, the authors gave a strong recommendation for abdominal reshaping.
Dr Kinney’s team scanned 22 people with MRI. At two months, fat thickness fell by 18.6 percent. Rectus abdominis muscle thickness rose by 15.4 percent. Both results were highly significant. Four people were scanned again at six months. Muscle thickness was up 20.5 percent from the start. Fat thickness was 22.69 mm, versus 25.72 mm at baseline.
A scan study of 10 postpartum women found a similar pattern. Fat thickness fell 17 percent at one month. It fell 20.1 percent at three months. It was still down 17.6 percent at six months. Muscle thickness rose 20.5 percent, then 21.3 percent, then 21.7 percent. The gap between the abdominal muscles also narrowed. It fell 16.7 percent, 22.7 percent, and 23.2 percent at those same checks.
A one-year follow-up of 21 people still showed change. Subcutaneous fat was down 14.63 percent. At six weeks it had been down 17.46 percent. Muscle thickness was up 19.05 percent at one year. At six weeks it had been up 17.66 percent. Abdominal separation was still down 10.46 percent at one year.
One CT review of 22 people measured deeper fat as well. Visceral fat fell 14.3 percent at one month. Subcutaneous fat thickness fell 17.5 percent in that same group. The authors called this study low quality. It is a signal, not final proof.
Who the measurements point to
The strongest measured benefits were in people treated on the abdomen. Postpartum women were one group the scans followed closely. Muscle thickness rose. Fat thickness fell. Abdominal separation narrowed, and some of that lasted to one year.
People seeking arm tone were a smaller group. Eighteen people had ultrasound checks. Biceps muscle thickness rose 15.4 percent at one month.
It was up 15.7 percent at six months. Fat over the biceps fell 13.2 percent, then 14.63 percent. Triceps muscle rose 13.7 percent, then 14.86 percent. Fat over the triceps fell 11.53 percent, then 13.4 percent.
Calf scans in 15 people showed the same direction. Calf muscle thickened 12.8 percent at one month. It was up 15.5 percent at three months. It was still up 14.6 percent at six months. Fat over the calf fell 13.3 percent, 15.1 percent, and 14.7 percent.
Buttock studies covered 156 people. Proof here was weaker. In seven people, MRI showed gluteal muscle volume up 10.81 percent at one month. It was up 21.9 percent at three months. Fat on the buttock barely changed, at 1.45 percent. Patients still scored satisfaction at 4.6 to 4.9 out of 5.
The review found no thigh studies. The authors said age and sex effects are still unclear. The people studied were mostly women, about 79 percent. Mean ages ran from about 32 to 47. So other groups may benefit too. The paper says that still needs direct study.
Normal-weight people showed slightly larger scan changes. Fat fell 20.6 percent in the normal BMI group. It fell 18.1 percent in the overweight group. People with a higher BMI still reported strong satisfaction. The authors said a thicker fat layer may soften the field before it reaches the muscle.
Comfort, and why the gains lasted
Side effects were mild in the 521 people. The common report was muscle soreness. It settled within 48 hours. Pain scores stayed low. No study in the review reported rhabdomyolysis. None reported kidney injury.
Some gains grew after the sessions ended. Muscle can keep thickening for months. The authors linked that to a higher resting burn from new muscle. They also said people felt motivated to keep the result. At one month, 87.9 percent said they wanted to exercise to hold the change. At three months, 71.9 percent still said that.
The doctors suggest a check at three to six months. A short top-up may help if the goal needs it. Effects in the abdomen were still measurable at one year.
This review does not promise the same scan result for every person. It does show a clear pattern. In these studies, muscle stimulation thickened muscle. It reduced fat thickness on the abdomen, arms, and calves. The abdomen had the best proof. Arms, calves, and buttocks showed promise, with smaller studies. Other groups may see benefits too. Larger trials will tell us how far that reach goes.
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Research Summary
| Detail | What the paper reports |
|---|---|
| Title | Muscle Stimulation for Aesthetic Body Shaping: A Comprehensive and Critical Review |
| Original study link | PubMed record and journal page (DOI: 10.1097/DSS.0000000000003550) |
| Authors | Pooja H. Rambhia, MD; Louise Turner, BS; Nkem Ugonabo, MD; Anne Chapas, MD |
| Research centres | Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, New Hyde Park, New York; UnionDerm, New York |
| Publisher and journal | Dermatologic Surgery, journal of the American Society for Dermatologic Surgery, published by Wolters Kluwer in the United States |
| Publication date | October 2022, volume 48, number 10, pages 1076–1082; first published online 22 July 2022 |
| Study type | PRISMA-guided systematic review of human studies, scored with the GRADE scale |
| Search | PubMed/MEDLINE and Embase, from the start of each database to 12 December 2021 |
| Studies included | 20 studies: 9 moderate quality, 8 low quality, 3 very low quality |
| People measured | 521 patients in total |
| Body sites | Abdomen, 378 patients; buttocks, 156; arms, 22; calves, 15. No thigh studies were found |
| How change was measured | MRI, CT, and ultrasound of muscle thickness and fat thickness, plus waist size, photos, and satisfaction scores |
| Abdomen finding | Strong recommendation. MRI at 2 months: fat thickness down 18.6%, rectus abdominis thickness up 15.4%. At 6 months in a small follow-up, muscle thickness was up 20.5% |
| One-year abdomen check | In 21 people, fat was still down 14.63% and muscle thickness was up 19.05% at 1 year |
| Postpartum women | In 10 women, fat fell 17% to 20.1%, muscle rose about 21%, and abdominal separation fell 16.7% to 23.2% over 1 to 6 months |
| Deeper abdominal fat | A low-quality CT review of 22 people found visceral fat down 14.3% and subcutaneous fat thickness down 17.5% at 1 month |
| Arms | Ultrasound in 18 people: biceps up 15.4% at 1 month and 15.7% at 6 months; fat over the biceps down 13.2% and 14.63%. Triceps up 13.7% and 14.86% |
| Calves | In 15 people, calf muscle thickened 12.8%, 15.5%, and 14.6% at 1, 3, and 6 months. Fat over the calf fell 13.3%, 15.1%, and 14.7% |
| Buttocks | Weak recommendation. In 7 people, gluteal muscle volume rose 10.81% at 1 month and 21.9% at 3 months. Fat change was only 1.45% |
| Safety and session length | Most sessions were 30 minutes, with no anaesthetic. In 521 people, soreness usually settled within 48 hours. No rhabdomyolysis or kidney injury was reported |
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