## 1 Introduction  
When body composition analysis reveals abnormalities such as excess body fat or skeletal muscle deficiency, the recommended therapeutic approach is to modify the diet and to introduce physical activity. Movement such as exercise is a well-known method of prevention and therapy for modern diseases. It improves endurance and increases skeletal muscle mass, reduces fat mass and the activity of the cardiovascular system, and prevents the development of osteoporosis by increasing bone mineral density. However, there is a group of people who have difficulty performing any physical exercise. It is associated with age, the presence of diseases of the musculoskeletal system, or simply a lack of motivation or an unhealthy lifestyle [1; 2]. One method that can reinforce or support physical activity is whole-body vibration (WBV).  
Whole body vibration (WBV) therapies have become popular. Many types of WBV devices are used, which differ in vibration parameters, such as frequency, amplitude, direction, and type of signal. The amplitude range of the platforms generating sinusoidal vertical (rhythmic) vibrations is 0-12 mm, and the frequency range is 30-60 Hz. The amplitude range of the side-alternating sinusoidal (rhythmic) vibrations is 0-12 mm, and the frequency range is 5-30 Hz. The amplitude range generating stochastic (arrhythmic) vibrations is 0-2 mm, and the frequency range is 1-12 Hz [3; 4].  
The use of WBV influences processes in the human body at various levels, starting from the activation of receptors and muscle response, through changes in hormone concentrations and the release of neurotransmitters, to the activation of many areas of the brain [4; 5]. In their latest studies, [PERSON] et al. [6] showed an increase in irisin levels, a decrease in levels of redox status markers, and reduced visceral adipose tissue mass after six weeks of WBV procedures. Vibration devices with stochastic resonance generate vibrations of varying amplitude and frequency. The patient stands with each foot on a separate platform, and the platforms vibrate independently. The body is constantly thrown out of balance. The vibration frequency is randomized; it constantly changes within certain limits, and the movements are impossible to predict. The neuromuscular system must react effectively to changes in a short time. This is particularly important among the elderly or among patients with movement disorders, when long-lasting and intense training sessions are not recommended [5; 7; 8].  
A number of scientific reports show a positive effect of physical activity on body composition [2]. In the literature, we can also find evidence of the positive impact of vibrations with stochastic resonance on other aspects of the human body, e.g., balance, muscle pain, and cognitive functions [9; 10; 11]. The impact of stochastic resonance whole body vibrations on individual parameters of female body composition have never been studied before. To assess the suitability of SR-WBV devices for fat mass reduction, a particular group of body composition parameters were selected: fat mass, percent body fat, and visceral fat area were analyzed. Due to the activation of muscle spindles and osteogenic response after stochastic resonance, as reported in the literature [12; 13], the fat-free body components measured by the In Body S10 device, including the most important parameters such as muscle mass, cellular mass, proteins, and bone minerals, were tested. As additional parameters, the water components were also measured.  
Young, healthy women with normal body composition were recruited for the experiment. This research was treated as a preliminary study to first examine the usefulness and additionally prove the safety of the SR-WBV procedure in young, healthy women before it can be implemented in older women, women with abnormal body composition, or women with various diseases.