Fundamental study of lower limb muscle activity using an angled whole body vibration exercise instrument

Abstract

This research was performed to assess the effects of angled whole body vibration on muscle activity of the lower limbs, by examining adults in their twenties during squat exercises, taking into account two variables of exercise intensity (vibration frequency and gradient). Twenty healthy males in their twenties with previous experience of more than 6 month's weight training and no past medical history were included in this study. The experiment was performed by participating in squat exercises which consisted of 3 sets (1 set = 5 seconds x 3 repetitions of exercise), and the muscle activities of the Rectus Femoris, Vastus Lateralis, Vastus Medialis were measured with variation in the gradients of 0°, 10°, and 20°, and vibration frequencies of 20, 30, and 40 Hz. At 30 and 40 Hz, the vastus lateralis showed the highest change in muscle activity, while activity of the vastus medialis also increased significantly. Analysis of muscle activity according to the gradient showed a significant increase of the vastus lateralis at 20°, while the highest muscle activity at 20° was observed for the vastus medialis. In comparison of the change in lower limb muscle activity according to simultaneous stimulation, at a gradient of 10°, high activity was shown in muscle, while at 20°, high muscle activities were produced at 40 Hz in the vastus lateralis, 40 Hz in the rectus femoris, and both 30 and 40 Hz in the vastus medialis

Evaluation of the temperature of posterior lower limbs skin during the whole body vibration measured by infrared thermography: Cross-sectional study analysis using linear mixed effect model

“…The current result suggests that the oscillating nature of WBVE was not detrimental to participants in promoting a negative response. Due to the action of the mechanical vibration, WBVE is associated with higher muscle activity [44,45], increased motor unit recruitment [46], enhanced blood flow [47], increased cutaneous sensitivity [48], and improved balance [44,49]. Moreover, this finding is in agreement with the results of Chudecka et al .…”

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.…”

“…results show the value of 0.904 ± 0.454 m.s -2 . Each of the studies included a period of a few months (Avelar et al 2013;Pel et al 2009;Torvinen et al 2002;Yu et al 2014;Yu et al 2015) with the recommended frequency of 20 -50 Hz for the favorable development of the muscles (Yu et al 2014), however, a frequency of 50 Hz can cause muscle aches (Yu et al 2014).…”

“…The increase of vibrations in bus driver's seat depends on several factors of which the position of the bus engine, road surface and moving speed, seat ability to absorb vibrations, are often referred. From the analyzed work results, vibrations cause pain in the lower back, spine, neck and shoulders (Alperovitch-Najenson et al 2010;Blood et al 2011;Blood et al 2015;Paddan et al 1998;Kim et al 2005;Picu et al 2010;Sekulić et al 2013;Thamsuwan et al 2013) on the other hand, they cause positive effects in terms of improving muscle performances circulation and increasing bone density (Avelar et al 2013;Frost et al 2007;Martinez-Pardo et al 2014;Pel et al 2009;Yu et al 2014;Yu et al 2015). However, a conclusion was reached that improving performances (using a vibration platform) occurs with certain frequencies (0-50 Hz) and oscillation amplitudes (0-9 mm), length of exposure (about four months), and where r.m.s.…”

“…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.…”