Objective: This paper aims to evaluate the feasibility, safety, and preliminary clinical effectiveness of low-frequency electrical muscle stimulation (EMS) for noninvasive gluteal contouring. Methods: Twenty adult participants (25 - 55 years) dissatisfied with their gluteal contour were enrolled in a prospective single-arm pilot study. Each participant received 10 weekly EMS sessions using the TONE-PRO device. Objective outcomes included changes in gluteus maximus thickness measured by standardized ultrasonography and changes in waist-to-hip ratio (WHR). Subjective outcomes were assessed using the Global Aesthetic Improvement Scale (GAIS). Safety was evaluated through structured adverse event monitoring. Results: Mean gluteus maximus thickness increased progressively during treatment, reaching +2.01 ± 0.83 mm after 10 sessions (P < 0.001), with maintenance at 1-month follow-up (+2.05 ± 0.88 mm vs baseline, P < 0.001). WHR decreased significantly from baseline (P < 0.001). Both patient and investigator GAIS scores demonstrated progressive aesthetic improvement. No serious adverse events occurred. Conclusion: In this exploratory pilot cohort, low-frequency EMS was associated with measurable increases in gluteal muscle thickness and favorable aesthetic outcomes with a reassuring safety profile. Controlled studies are required to confirm durability and comparative efficacy.
References
[1]
Kloth, L.C. (2005) Electrical Stimulation for Wound Healing: A Review of Evidence from in Vitro Studies, Animal Experiments, and Clinical Trials. The International Journal of Lower Extremity Wounds, 4, 23-44. https://doi.org/10.1177/1534734605275733
[2]
Haufs, M.G. and Z？llner, Y.F. (2020) Waist-Hip Ratio More Appropriate than Body Mass Index. Deutsches？rzteblatt International, 117, Article No. 659. https://doi.org/10.3238/arztebl.2020.0659a
[3]
Harris, E. (2023) Study: Waist-to-Hip Ratio Might Predict Mortality Better than BMI. JAMA, 330, 1515-1516. https://doi.org/10.1001/jama.2023.19205
[4]
Widjaja, N.A., Arifani, R. and Irawan, R. (2023) Value of Waist-to-Hip Ratio as a Predictor of Metabolic Syndrome in Adolescents with Obesity. Acta Biomedica, 94, e2023076.
[5]
Cao, Q., Yu, S., Xiong, W., Li, Y., Li, H., Li, J., et al. (2018) Waist-Hip Ratio as a Predictor of Myocardial Infarction Risk: A Systematic Review and Meta-Analysis. Medicine (Baltimore), 97, e11639. https://doi.org/10.1097/md.0000000000011639
[6]
Gao, F., Wan, J., Xu, B., Wang, X., Lin, X. and Wang, P. (2020) Trajectories of Waist-To-Hip Ratio and Adverse Outcomes in Heart Failure with Mid-Range Ejection Fraction. Obesity Facts, 13, 344-357. https://doi.org/10.1159/000507708
[7]
Kinney, B.M. and Lozanova, P. (2019) High Intensity Focused Electromagnetic Therapy Evaluated by Magnetic Resonance Imaging: Safety and Efficacy Study of a Dual Tissue Effect Based Non-Invasive Abdominal Body Shaping. Lasers in Surgery and Medicine, 51, 40-46. https://doi.org/10.1002/lsm.23024
[8]
Kavanagh, S., Newell, J., Hennessy, M. and Sadick, N. (2012) Use of a Neuromuscular Electrical Stimulation Device for Facial Muscle Toning: A Randomized, Controlled Trial. Journal of Cosmetic Dermatology, 11, 261-266. https://doi.org/10.1111/jocd.12007
[9]
Frank, K., Kaye, K.O., Casabona, G., Glaue, E., Zeng, R., Moellhoff, N., et al. (2025) Effect of Synchronized Radiofrequency and High-Intensity Facial Electrical Stimulation (HIFES) of the Upper Face. Aesthetic Surgery Journal, 45, 525-530. https://doi.org/10.1093/asj/sjaf009
[10]
Hwang, U.J., Kwon, O.Y., Jung, S.H., Ahn, S.H. and Gwak, G.T. (2018) Effect of a Facial Muscle Exercise Device on Facial Rejuvenation. Aesthetic Surgery Journal, 38, 463-476. https://doi.org/10.1093/asj/sjx238
[11]
Abe, T., Loenneke, J.P., Thiebaud, R.S. and Loftin, M. (2014) Morphological and Functional Relationships with Ultrasound Measured Muscle Thickness of the Upper Extremity and Trunk. Ultrasound, 22, 229-235. https://doi.org/10.1177/1742271X14554678
