The aim of this study is to examine the impact of lower limb muscle strength in semi-elite athletes engaged in short track speed skating through the lens of different frequency vibration training. The methodology employed in this study is as follows: The study employs an experimental methodology. Subsequent to the screening process, a total of 75 male semi-elite short track speed skaters were selected from the Shenyang Institute of Physical Education. The participants were randomly assigned to one of three groups: a 30 Hz frequency vibration group comprising 25 individuals, a 50 Hz frequency vibration group comprising 25 individuals, and a control group comprising 25 individuals. The experimental group underwent the intervention on two occasions per week, with three groups participating on each occasion. The total duration of the intervention was four weeks, with an amplitude of 2mm. Each session comprised 30 seconds of whole-body vibration training. The control group comprised 25 individuals who performed the same duration and posture of semi-squatting movement on the vibration platform, but without additional vibration stimulation. The maximum strength, rapid strength, and strength endurance of the knee flexors and extensors during centripetal contraction were evaluated both before and after the intervention. The results are presented in the following manner: (1) Maximum power: the peak moments of the knee flexor and extensor muscle groups of both legs of the subjects exhibited a notable enhancement in comparison to the values observed prior to the training period (P < 0.01). The vibration frequency of 50 Hz demonstrated a more pronounced impact on the improvement of the peak moments of the knee flexor muscle groups on both sides. (2) Rapid power: the 50Hz vibration frequency was observed to have a more significant enhancement effect on the peak power of the bilateral knee flexor muscle groups and the left knee extensor muscle groups (P < 0.05). (3) Muscular endurance: a significant difference was observed in the total work of the subjects' bilateral knee flexor and extensor muscle groups with different frequencies of vibration stimulation (P < 0.05), with a highly significant difference noted in the total work of the left knee flexor muscle group (P < 0.01). It can be concluded that four weeks of vibration training at different frequencies can significantly improve the muscle strength of the knee joints in semi-elite short track speed skaters. Furthermore, the results demonstrate that a vibration frequency of 50 Hz is more effective than 30 Hz in terms of maximal and rapid strength when the amplitude is 2 mm.
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