Vibration is transmitted to the body during sport and exercise activities, in particular when humans experience impacts and/or collisions. When impacts occur, vibrations and shock waves propagate through the human body. The neuromuscular system is involved in damping these vibratory waves by increasing muscle activity to increase vibration damping. Soft tissues have been shown to oscillate during impacts, and we hypothesized that muscle deforms when vibration is applied. PURPOSE: As vibrations can travel through a tissue as longitudinal and transverse waves of oscillations, we aimed to evaluate the use of high speed ultrasonography to determine muscle deformation and transverse waves of oscillation in-vivo during a vibratory stimulation. METHODS: Six healthy males were exposed to vertical sinusoidal vibrations of their right arm when they gripped a vibrating dumbbell (mass 2.9 kg). Subjects completed nine trials, applied in duplicate and in randomised order; consisting of three vibration frequencies (21, 24 and 27 Hz) and three levels of muscle tension (5, 50 and 95% MVC). Vibration amplitude was constant at 6 mm peak-to-peak. Ultrasound was used to image biceps brachii muscle fascicles during each condition (Telemed, 7.5 MHz linear probe, 128 sectors, 75 Hz scanning frequency). RESULTS: The results showed that muscle oscillations during vibratory stimulation were less than 1 mm with a wavelength of 200 to 400 mm. Wavelength showed a trend to increase with muscle tension. CONCLUSIONS: The results of this study suggest that transverse waves propagate through muscle tissue when a vibratory stimulus is applied. Furthermore, the study shows that high speed ultrasonography could be used effectively to analyse vibration damping in-vivo.