Effect of vibration on muscle strength imbalance in lower extremity using multi-control whole body vibration platform

Abstract

Abstract. This study shows the improvement of muscle activity and muscle strength imbalance in the lower extremities through independent exercise loads in vibration platform. Twenty females of age 20 participated in this study. The subjects were divided into WBV group, with more than 10% of muscle strength imbalance between left and right the lower extremities, and control group, with less than 10% of muscle strength imbalance between left and right the lower extremities. As the prior experiment showed, different exercise postures provide different muscular activities. As a result, the highest muscular activity was found to be in the low squat posture. Therefore, the LS posture was selected for the exercise in this experiment. Vibration intensities were applied to dominant muscle and non-dominant muscle, and the vibration frequency was fixed at 25Hz for the WBV group. The control group was asked to perform the same exercise as the WBV group, without stimulated vibration. This exercise was conducted for a total of 4 weeks. As a result, the WBV group which showed an average deviation of 16% before the experiment, tended to decrease approximately to 5%. In this study, vibration exercise using load deviation is shown to be effective in improving the muscle strength imbalance.

The effect of the training with the different combinations of frequency and peak-to-peak vibration displacement of whole-body vibration on the strength of knee flexors and extensors

“…It has been suggested that hamstring strengthening improves joint stabilization and reduces the risk of lower limb injury [38]. Since vibration training reduces strength asymmetry between the quadriceps and the hamstrings (as confirmed – in our study – by a tendency of the H/Q ratio to increase) and improves muscle strength imbalance between the lower extremities [39] it might be used for prevention and rehabilitation in patients with muscle and knee joint injuries including anterior cruciate ligament injury [13]. …”

Occupational Vibration in Urban Bus and Influence on Driver’s Lower Limbs

“…In contrast, the whole-body vibrations are used in modern medicine for training and rehabilitation, increasing muscle tone and circulation, improving bone and neuromuscular functions, knee flexion, better muscle performances, speed up recovery period (after long period of exercise or similar) among others (Martinez-Pardo et al 2014;Pel et al 2009;Torvinen et al 2002;Yu et al 2014). For this purpose, vibrating platforms are used on which a subject stands and through the changing of frequency (0-50 Hz) (Yu et al 2015), the oscillation amplitude (0 -9 mm) and angles of the knee (30 0 , 60 0 , 90 0 ) (Avelar et al 2013;Ritzmann et al 2013), the above described positive results are obtained. During the bus ride, the angles over 90° are predicted.…”

“…According to the above described use of vibrations Yu et al (2015) state that an angle of 90° provides better flexibility of the knee, and the r.m.s. results show the value of 0.904 ± 0.454 m.s -2 .…”

“…Moreover, the effect of vibrations can also cause positive effects on the organism. Different studies indicate that under longer influence of vibrations there are improvements of the strength and muscle power, which means better muscle performance (Avelar et al 2013;Pel et al 2009;Yu et al 2014), improving the blood circulation (Yu et al 2015) and increasing bone density (Schneider et al 2015). These authors refers to literature which states that "vibration training" can lead to positive results in the treatment of sarcopenia, osteoporosis and metabolic syndrome, and that they were also used in physical therapy, the fitness industry, professional sports, rehabilitation and beauty and wellness applications.…”

Whole‐body vibration exposure of occupational horseback riding in agriculture: A ranching example

“…It appears that the low ISO‐weighted average frequency of horseback WBV (range 2.5–3.6 Hz) may impose discomfort and may relate to deleterious health effects on the lumbar spine, which has a natural resonant frequency of 4–12 Hz [Pope and Novotny, ; Chaffin et al, ]. However, in a highly controlled context, low‐magnitude but high‐frequency vibration from horseback riding may also provide some therapeutic benefit, particularly when considering the recreational effect and its anabolic effects on the bone and muscle strength as well as balance [Whalen and Case‐Smith, ; Wehrle et al, ; Yu et al, ].…”