 This study compared the effectiveness of using high-intensity focused electromagnetic field, hyphem, treatment combined with radiofrequency, RF, heating versus hyphem treatment alone on the buttocks. At one month after treatment, subjects who received both treatments had a greater increase in muscle thickness than those who only received hyphem treatment. This effect was sustained at three months post-treatment, when 27 patients were evaluated in each group. These findings suggest that combining hyphem with RF heating is more effective than hyphem alone for gluteal contouring. This article was authored by Barry D. I. Bernardo, Sunil Chillakuri, J. D. McCoy and others.