scholarly journals Physiological and Muscular Stress Associated with Multi-axial Whole-Body Vibration Exposure in Mining Heavy Equipment Vehicle Environment

2019 ◽  
Vol 63 (1) ◽  
pp. 1040-1045
Author(s):  
Kiana Kia ◽  
Stephanie Fitch ◽  
Sean Newsom ◽  
Jay Kim
Keyword(s):  
Creatine Kinase ◽  
Muscle Damage ◽  
Muscle Activity ◽  
Physiological Stress ◽  
Whole Body Vibration ◽  
Vertical Axis ◽  
Whole Body ◽  
Vibration Exposure ◽  
Low Back ◽  
Mining Vehicles

Whole-body vibration (WBV) is known to be a leading factor for developing musculoskeletal disorders (MSDs). As mining vehicle operators are exposed to frequent transient shocks and substantial non-vertical WBV exposures, they may be at a greater risk than on-road vehicle operators. However, the impact of such exposures is not well understood. Therefore, this study aimed to evaluate how the exposure to WBV affected physiological stress and whether mining vehicles’ vibration with substantial non-vertical WBV components would further increase the level of physiological stress as compared to on-road vehicle vibration (vertical-axis dominant vibration). In a repeated-measures laboratory study, a 6-degree-of-freedom motion platform was used to recreate three different types of field-collected vibration profiles: vertical-axis dominant vibration measured from on-road long-haul trucks (VA), multi-axial vibration measured from mining vehicles (MA), and no vibration (control condition: CC). Subjects were exposed to each vibration condition for 2-hour sessions over three different experimental days. Blood samples were collected before and after each exposure session in order to measure biological markers for inflammation (tumor necrosis factor-α: TNFα), muscle damage (creatine kinase), and physiological stress (cortisol). During the 2-hour WBV exposures, muscle activity in the neck and low back muscles was measured using electromyography. The results showed that there were statistically significant differences in TNFα (inflammatory response) levels between vibration exposure (VA and MA) and the control condition (no vibration) (p = 0.01); however, these differences are not considered as clinically significant changes. No significant changes were found in muscle damage (creatine kinase) and physiological stress (cortisol). The vibration exposure conditions (VA and MA) showed higher low back muscle activity; however, these differences did not reach statistical significance (p’s > 0.08). Neck muscle activity did not differ among exposure conditions. The lack of effect in these results may support previous findings that MSDs develop from prolonged exposure to WBV and not from acute exposure to physical risk factors.

Comparisons of Whole Body Vibration, Muscle Activity and Non-driving Task Performance between Different Seat Suspensions in an Autonomous Passenger Car Application

2018 ◽  
Vol 62 (1) ◽  
pp. 1848-1852
Author(s):  
Kiana Kia ◽  
Peter W Johnson ◽  
Jeong Ho Kim
Keyword(s):  
Task Performance ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Active Suspension ◽  
Whole Body ◽  
Low Back ◽  
Motion Platform ◽  
Body Vibration ◽  
Pointing Task ◽  
Driving Task

This study compared whole body vibration (WBV), muscle activity and non-driving task performance between different seat suspension settings in a simulated autonomous passenger car environment. To simulate autonomous vehicle environment, field-measured vibration profiles were recreated on a large-scale 6-degree-of-freedom motion platform. In a repeated-measures laboratory experiment, we measured whole body vibration, muscle activity (neck, shoulder and low back), participants non-driving task performance while participants performed non-driving tasks (pointing task with a laptop trackpad, keyboard typing, web-browsing, and reading) on three different suspension seats mounted on the motion platform: vertical (z-axis) electromagnetic active suspension, multi-axial (lateral (y-axis) and vertical (z-axis)) electromagnetic active suspension, and no suspension (industry standard suspension-less seat for passenger cars). The average weighted vibration [A(8)] and vibration dose value [VDV(8)] showed that the seat measured vibration on both the vertical [A(8) = 0.29 m/s2 and VDV(8) = 10.70 m/s1.75] and multi-axial suspension seats [A(8) = 0.29 m/s2 and VDV(8) = 10.22m/s1.75] were lower than no-suspension seat vibration [A(8) = 0.36 m/s2 and VDV(8) = 12.84 m/s1.75]. Despite the significant differences in WBV between the different suspensions there were no significant differences across three different suspension seats in typing performance (typing speed and accuracy: p’s > 0.83), pointing task performance (movement time and accuracy: p’s > 0.87), web-browsing (number of questions and webpages read: p = 0.42), and reading (number of words read: p = 0.30). The muscle activity in low back (erector spinae) and shoulder (trapezius) muscles also did not show any significant differences (p’s > 0.22). These laboratory study findings indicated that despite the significant reduction in WBV, neither vertical nor multi-axial active suspension seats improve non-driving task performance as compared to the no-suspension seat.

scholarly journals Effects of Whole Body Vibration exercise on Lumbar-Abdominal Muscles Activation for patients with chronic low back pain

2020 ◽  
Author(s):  
yulin dong ◽  
huifang wang ◽  
Yan Zhu ◽  
Binlin Chen ◽  
Yili Zheng ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Abdominal Muscle ◽  
Erector Spinae ◽  
Whole Body ◽  
Low Back ◽  
Body Vibration

Abstract BackgroundWhole body vibration (WBV) training as an intervention method can cure chronic low back pain (CLBP). Different WBV parameters exert different effects on lumbar-abdominal muscle performance. Currently, there is a lack of study researched the influence of WBV training on patients with CLBP by lumbar–abdominal muscle activity. Therefore, this study aimed to investigate how WBV and exercise and their interactions influence lumbar-abdominal muscle activity in patients with CLBP.Methodsa group of ambulatory patients with chronic low back pain. Muscle activities of the multifidus, erector spinae, abdominal oblique externus muscle and the rectus abdominis muscle were measured by surface electromyography, whereas participants performed 4 different exercises during three whole body vibration conditions and a no-vibration condition in a single experimental session.ResultsCompared with the same exercises without whole body vibration, muscle activity increased when whole body vibration was added to the exercises. The frequency and exercise presented significant effects on the root mean square of multifidus, whereas exercise and frequency also resulted in significant interaction effects.ConclusionAdding whole body vibration to exercise could increase muscle activation of lumbar–abdominal muscle in patients with CLBP. The optimum frequency for lumbar–abdominal muscles is 15 Hz. The best exercises include plank for multifidus and erector spinae, V crunch for rectus abdominis and single bridge for abdominal oblique externus.Trial registration:ChiCTR-TRC-13003708. Registered 19 October 2013, http://www.chictr.org.cn/showproj.aspx?proj=5852

scholarly journals Effects of Whole Body Vibration exercise on Lumbar-Abdominal Muscles Activation for patients with chronic low back pain

2020 ◽  
Author(s):  
yulin dong ◽  
huifang wang ◽  
Yan Zhu ◽  
Binlin Chen ◽  
Yili Zheng ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Abdominal Muscle ◽  
Whole Body ◽  
Low Back ◽  
Exercise Frequency ◽  
Body Vibration

Abstract Background: Whole body vibration (WBV) training as an intervention method can cure chronic low back pain (CLBP). Different WBV parameters exert different effects on lumbar-abdominal muscle performance. Currently, there is a lack of study researched the influence of WBV training on patients with CLBP by lumbar–abdominal muscle activity. Therefore, this study aimed to investigate how WBV and exercise and their interactions influence lumbar-abdominal muscle activity in patients with CLBP.Methods: a group of ambulatory patients with chronic low back pain. Muscle activities of the multifidus (MF), erector spinae (ES), abdominal oblique externus muscle (AOE) and the rectus abdominis muscle (RA) were measured by surface electromyography, whereas participants performed 4 different exercises (single bridge, plank, side stay and V crunch) during three whole body vibration conditions and a no-vibration condition in a single experimental session. Results: Compared with the same exercises without whole body vibration, muscle activity increased when whole body vibration was added to the exercises. MF；the WBV frequency (P=0.002,) and exercise (P<0.001) presented significant effects on the root mean square of MF, whereas exercise * frequency (P=0.044) also resulted in significant interaction effects. ES: the significant differences were detected at WBV frequency (P<0.001), exercise (P<0.001), the interaction effect of exercise and frequency (P=0.225) was no significant. RA: the significant difference was detected at WBV frequency (P=0.018), the effect of exercise (P=0.590) and the exercise * frequency interaction (P=0.572) were no significant. AOE: the significant difference was detected at WBV frequency (P<0.001), the effect of exercise (P=0.152) and the exercise * frequency interaction (P=0.380) were no significant.Conclusion: Adding whole body vibration to exercise could increase muscle activation of lumbar–abdominal muscle in patients with CLBP. The optimum frequency for lumbar–abdominal muscles is 15 Hz. The best exercises include plank for multifidus and erector spinae, V crunch for rectus abdominis and single bridge for abdominal oblique externus.

scholarly journals Effects of Whole Body Vibration exercise on Lumbar-Abdominal Muscles Activation for patients with chronic low back pain

2020 ◽  
Author(s):  
yulin dong ◽  
huifang wang ◽  
Yan Zhu ◽  
Binlin Chen ◽  
Yili Zheng ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Abdominal Muscle ◽  
Whole Body ◽  
Low Back ◽  
Exercise Frequency ◽  
Body Vibration

Abstract Background: Whole body vibration (WBV) training as an intervention method can cure chronic low back pain (CLBP). Different WBV parameters exert different effects on lumbar-abdominal muscle performance. Currently, there is a lack of study researched the influence of WBV training on patients with CLBP by lumbar–abdominal muscle activity. Therefore, this study aimed to investigate how WBV and exercise and their interactions influence lumbar-abdominal muscle activity in patients with CLBP.Methods: a group of ambulatory patients with chronic low back pain. Muscle activities of the multifidus (MF), erector spinae (ES), abdominal oblique externus muscle (AOE) and the rectus abdominis muscle (RA) were measured by surface electromyography, whereas participants performed 4 different exercises (single bridge, plank, side stay and V crunch) during three whole body vibration conditions and a no-vibration condition in a single experimental session. Results: Compared with the same exercises without whole body vibration, muscle activity increased when whole body vibration was added to the exercises. MF；the WBV frequency (P=0.002,) and exercise (P<0.001) presented significant effects on the root mean square of MF, whereas exercise * frequency (P=0.044) also resulted in significant interaction effects. ES: the significant differences were detected at WBV frequency (P<0.001), exercise (P<0.001), the interaction effect of exercise and frequency (P=0.225) was no significant. RA: the significant difference was detected at WBV frequency (P=0.018), the effect of exercise (P=0.590) and the exercise * frequency interaction (P=0.572) were no significant. AOE: the significant difference was detected at WBV frequency (P<0.001), the effect of exercise (P=0.152) and the exercise * frequency interaction (P=0.380) were no significant.Conclusion: Adding whole body vibration to exercise could increase muscle activation of lumbar–abdominal muscle in patients with CLBP. The optimum frequency for lumbar–abdominal muscles is 15 Hz. The best exercises include plank for multifidus and erector spinae, V crunch for rectus abdominis and single bridge for abdominal oblique externus.

Characterization of the Frequency and Muscle Responses of the Lumbar and Thoracic Spines of Seated Volunteers During Sinusoidal Whole Body Vibration

2014 ◽  
Vol 136 (10) ◽  
Author(s):  
Hassam A. Baig ◽  
Daniel B. Dorman ◽  
Ben A. Bulka ◽  
Bethany L. Shivers ◽  
Valeta C. Chancey ◽  
...  
Keyword(s):  
Back Pain ◽  
Muscle Activity ◽  
Muscle Activation ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Body Vibration ◽  
Male Volunteers ◽  
Seat Vibration ◽  
Muscle Responses

Whole body vibration has been postulated to contribute to the onset of back pain. However, little is known about the relationship between vibration exposure, the biomechanical response, and the physiological responses of the seated human. The aim of this study was to measure the frequency and corresponding muscle responses of seated male volunteers during whole body vibration exposures along the vertical and anteroposterior directions to define the transmissibility and associated muscle activation responses for relevant whole body vibration exposures. Seated human male volunteers underwent separate whole body vibration exposures in the vertical (Z-direction) and anteroposterior (X-direction) directions using sinusoidal sweeps ranging from 2 to 18 Hz, with a constant amplitude of 0.4 g. For each vibration exposure, the accelerations and displacements of the seat and lumbar and thoracic spines were recorded. In addition, muscle activity in the lumbar and thoracic spines was recorded using electromyography (EMG) and surface electrodes in the lumbar and thoracic region. Transmissibility was determined, and peak transmissibility, displacement, and muscle activity were compared in each of the lumbar and thoracic regions. The peak transmissibility for vertical vibrations occurred at 4 Hz for both the lumbar (1.55 ± 0.34) and thoracic (1.49 ± 0.21) regions. For X-directed seat vibrations, the transmissibility ratio in both spinal regions was highest at 2 Hz but never exceeded a value of 1. The peak muscle response in both spinal regions occurred at frequencies corresponding to the peak transmissibility, regardless of the direction of imposed seat vibration: 4 Hz for the Z-direction and 2–3 Hz for the X-direction. In both vibration directions, spinal displacements occurred primarily in the direction of seat vibration, with little off-axis motion. The occurrence of peak muscle responses at frequencies of peak transmissibility suggests that such frequencies may induce greater muscle activity, leading to muscle fatigue, which could be a contributing mechanism of back pain.

The Role of the Central Nervous System in the Integration of Proprioceptive Activity

2012 ◽  
Author(s):  
Joseph S. Soltys ◽  
Sara E. Wilson
Keyword(s):  
Brain Activity ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Neural Pathways ◽  
Low Back ◽  
Body Vibration ◽  
Positive Effects ◽  
Low Back Disorders ◽  
The Central Nervous System

Vibration exposure has been known to have both negative and positive effects on human dynamics in a variety of clinical and occupational applications. Whole body vibration is known to be associated with low back pain and low back disorders [1]. It has been shown that whole body vibration and vibration of the lumbar musculature can result in loss of proprioceptive accuracy and delays in muscular response to sudden loading [24]. Conversely, vibration of the musculature has also been proposed as a means to improve the effects of training and exercise on strength and endurance [5–7]. Vibration has a number of known effects on proprioception in particular. These include kinesthetic illusions during vibration exposure [8] and altered proprioception post-vibration exposure [3, 9]. Understanding the neural pathways that contribute to these effects is important in better understanding the clinical and occupational implications of vibration exposure. Therefore, the objective of the current study was to examine brain activity using functional magnetic resonance imaging (fMRI) during a dynamic, proprioceptive task, both during and after vibration exposure in order to observe changes in activation that might contribute to these effects.

scholarly journals Effects of whole body vibration exercise on lumbar-abdominal muscles activation for patients with chronic low back pain

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yulin Dong ◽  
Huifang Wang ◽  
Yan Zhu ◽  
Binglin Chen ◽  
Yili Zheng ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Muscle Activity ◽  
Whole Body Vibration ◽  
Abdominal Muscle ◽  
Whole Body ◽  
Low Back ◽  
Exercise Frequency ◽  
Body Vibration

Abstract Background Whole body vibration (WBV) training as an intervention method can cure chronic low back pain (CLBP). Different WBV parameters exert different effects on lumbar-abdominal muscle performance. Currently, there is a lack of study researched the influence of WBV training on patients with CLBP by lumbar–abdominal muscle activity. Therefore, this study aimed to investigate how WBV and exercise and their interactions influence lumbar-abdominal muscle activity in patients with CLBP. Methods a group of ambulatory patients with chronic low back pain. Muscle activities of the multifidus (MF), erector spinae (ES), abdominal oblique externus muscle (AOE) and the rectus abdominis muscle (RA) were measured by surface electromyography, whereas participants performed 4 different exercises (single bridge, plank, side stay and V crunch) during three whole body vibration conditions and a no-vibration condition in a single experimental session. Results Compared with the same exercises without whole body vibration, muscle activity increased when whole body vibration was added to the exercises. MF; the WBV frequency (P = 0.002,) and exercise (P < 0.001) presented significant effects on the root mean square of MF, whereas exercise * frequency (P = 0.044) also resulted in significant interaction effects. ES: the significant differences were detected at WBV frequency (P < 0.001), exercise (P < 0.001), the interaction effect of exercise and frequency (P = 0.225) was no significant. RA: the significant difference was detected at WBV frequency (P = 0.018), the effect of exercise (P = 0.590) and the exercise * frequency interaction (P = 0.572) were no significant. AOE: the significant difference was detected at WBV frequency (P < 0.001), the effect of exercise (P = 0.152) and the exercise * frequency interaction (P = 0.380) were no significant. Conclusion Adding whole body vibration to exercise could increase muscle activation of lumbar–abdominal muscle in patients with CLBP. The optimum frequency for lumbar–abdominal muscles is 15 Hz. The best exercises include plank for multifidus and erector spinae, V crunch for rectus abdominis and single bridge for abdominal oblique externus. Clinical registration Trial registration: ChiCTR-TRC-13003708. Registered 19 October 2013. The code of ethical approval 2014008.

The Comparisons of Whole Body Vibration Exposures and Supporting Musculature Loading between Single- and Multi-axial Suspension Seats during Agricultural Tractor Operation

2016 ◽  
Vol 60 (1) ◽  
pp. 923-927 ◽  
Author(s):  
Jeong Ho Kim ◽  
Jack T Dennerlein ◽  
Peter W Johnson
Keyword(s):  
Muscle Activity ◽  
Repeated Measures ◽  
Whole Body Vibration ◽  
Erector Spinae ◽  
Whole Body ◽  
Low Back ◽  
Body Vibration ◽  
Repeated Measures Design ◽  
Industry Standard ◽  
Agricultural Tractor

Due to rough terrain, agricultural tractor drivers are likely exposed to a high level of whole body vibration, especially impulsive shocks. These WBV exposures are often predominant in the fore-aft (x) or lateral (y) axis. However, the current industry standard seats are designed to reduce mainly vertical (z) axis WBV exposures, and therefore, may be less effective in reducing tractor drivers’ exposure to WBV. Therefore, in a repeated-measures design with 11 subjects, this study evaluated efficacy of a multi-axial (vertical + lateral) suspension seat in reducing WBV exposure and low back (erector spinae) muscle activity relative to an industry standard single-axial suspension seat. The results showed that while there was no difference in fore-aft (x) and vertical (z) axis WBV exposures between the seats, the multi-axial suspension seat had lower A(8) lateral (y) WBV exposures [median (interquartile range): 0.7 (0.41, 0.83) m/s2] and VDV(8) [13.5 (7.4, 16.4) m/s1.75] WBV exposures than the single-axial suspension seats [ A(8): 0.81 (0.48 0.93) m/s2; VDV(8): 13.5 (8.7, 18.5) m/s1.75] (p = 0.02 and 0.04, respectively). Low back muscle activity was also lower on the multi-axial suspension seats, however this difference was not significantly significant. These results indicate that mu the multi-axial suspension may have potential to reduce the WBV exposures and muscular loading on low back among agricultural vehicle operators.

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