## 4 Discussion  
This study aimed to evaluate the effectiveness of vibration therapy (VT) and passive rest (PR) on the recovery of upper limb muscle strength and plasma lactate levels in elite boxers and kickboxers following predominantly anaerobic exercise. The results indicated that VT led to faster recovery of muscle function and improved muscle endurance compared to PR. While we observed quicker times to peak torque and reduced fatigue indices in the VT group, it is important to note that this study did not directly measure the recruitment of muscle fibers. The observed improvements in performance metrics suggest enhanced neuromuscular function, but further research using electromyography (EMG) or other techniques would be necessary to specifically assess muscle fiber recruitment. The agonist-to-antagonist ratio is an important measure in this study as it provides insights into muscle balance and joint stability. A more favorable ratio suggests symmetrical recovery of muscle groups, which is crucial for reducing injury risk and maintaining overall muscle health. Research indicates that maintaining a balanced agonist-antagonist ratio helps in optimizing athletic performance and minimizing injury risks. The findings support the potential of VT in sports recovery protocols, although similar lactate responses suggest that metabolic recovery rates are not significantly affected. Further research is needed to confirm these findings and explore the long-term effects of VT on muscle recovery and performance. The results of the studies conducted by [PERSON], [PERSON], [PERSON], and [PERSON] and [PERSON] indicate discrepancies in the presented views, allowing the conclusion that the authors did not always achieve improvements in the measured parameters after applying vibration therapy following exercise or during breaks between exercise sets [21; 24; 25; 28]. This may be due to the fact that each study used different vibration frequencies and amplitudes. The studies also varied in terms of the duration and location of the vibration application, which undoubtedly could have significantly impacted the final effects of the therapy. However, recent studies have shown positive observations regarding the use of vibration as a superior form of intervention over passive rest in biological regeneration [18]. Whole-body vibration (WBV) treatments are an innovative form of intervention in the training process, and to date, only a few studies have examined the effect of combining different frequencies and amplitudes of vibration. As indicated by research [29], beneficial effects can be achieved by smoothly changing the frequency and amplitude of vibration applied during a WBV program. Similar methodologies have been used only in separate treatment cycles, comparing the effects of different frequencies and amplitudes on the achieved results. In most studies, authors utilized a strictly defined vibration stimulus (frequency, amplitude, acceleration) and examined its effect on measured variables. Therefore, it seems reasonable to apply a vibration stimulus with variable frequency, amplitude, and duration, which will more effectively impact all types of muscle fibers and sensory receptors. An essential condition for comparing the effects of varied interventions on the speed and effectiveness of biological regeneration is ensuring that the muscles of the study participants are fatigued to the same extent, in this case, during predominantly anaerobic exercise. When comparing loads in the exercise test, it should be noted that the relative values of the Rel. SBFT index [30] did not differ significantly between the LBV and PR groups. This indicates a similar level of fatigue in the flexor and extensor muscles of the elbow joints in both groups. The use of dedicated vibrating mats allowed for localized vibration intervention in a comfortable resting position for the muscles controlling the upper limb joints, which could be significant for the relaxation and regeneration of muscles fatigued by exercise and its superiority over passive rest.