Power Absorbed by the Standing Human Body During Whole-Body Vibration Training
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Abstract Absorbed power (AP) is a biodynamic response that is directly related to the magnitude and duration of vibration. No work has previously investigated the power absorbed by the standing human body during the exposure to vibration training conditions or otherwise. This article reports the power absorbed by the standing human body under whole-body vibration (WBV) training conditions. In this work, the force and acceleration used to calculate the apparent mass by Nawayseh and Hamdan (2019, “Apparent Mass of the Standing Human Body When Using a Whole-Body Vibration Training Machine: Effect of Knee Angle and Input Frequency,” J. Biomech., 82, pp. 291–298) were reanalyzed to obtain the AP. The reported acceleration was integrated to obtain the velocity needed to calculate the AP. The effects of bending the knees (knee angles of 180 deg, 165 deg, 150 deg, and 135 deg) and vibration frequency (17–42 Hz) on the power absorbed by 12 standing subjects were investigated. Due to the different vibration magnitudes at different frequencies, the AP was normalized by dividing it by the power spectral density (PSD) of the input acceleration to obtain the normalized AP (NAP). The results showed a dependency of the data on the input frequency as well as the knee angle. A peak in the data was observed between 20 and 24 Hz. Below and above the peak, the AP and NAP tend to increase with more bending of the knees indicating an increase in the damping of the system. This may indicate the need for an optimal knee angle during WBV training to prevent possible injuries especially with prolonged exposure to vibration at high vibration intensities.Keywords:
Whole body vibration
Whole-body-vibration training has been promoted as an efficient and safe alternative for resistance and exercise training, even if performed to exhaustion; the increases in heart rate, blood pressure, and oxygen uptake during whole-body-vibration are mild, so that cardiovascular risks from whole-body-vibration in older adults are negligible. PURPOSE: To evaluate the effects of whole-body-vibration on the musculoskeletal system of 6-month old female rats. METHODS: Twenty 6-month old female 344 Fischer rats were randomized by weight into two groups (vibration n = 10 or control n = 10). Rats in the vibration group (n = 10) were placed inside individual 5″× 11″ × 6″ compartments attached to a Pneu-Vibe vibration platform (Pneumex, Sandpoint, ID). This group received 36 minutes of high amplitude (10mm peak to peak) vibration per day five days per week for 13 weeks. The vibration intervention consisted of 6 five minute cycles. Each minute consisted of 35 seconds at 30Hz, 25 seconds at 40Hz, and five seconds at 50Hz. Each five minute cycle was followed by a one minute rest interval. A one-way analysis of variance was conducted to evaluate between-subjects effects for body composition and bone mass. RESULTS: Whole-body-vibration resulted in significant body composition differences between the whole-body-vibration and body-weight-matched control group. Dual x-ray absorptiometry (DXA) whole body scans revealed that the whole-body-vibration group weighed approximately 10% less [222 (g) vs. 207 (g), p. ≤ .03] and had less body fat [26.8 (g) vs. 20.6 (g), p. ≤.02] and a lower percent body fat [10.2% vs. 12%, p. ≤ .05] than the age matched controls. No differences were observed for total lean mass, total body BMC or BMD. Regional high resolution DXA scans of the lumbar spine (L1-4) revealed that the whole-body-vibration group had significantly greater BMC [.33 (g) vs .26 (g) p. ≤.01] and BMD [.21 (g/cm2) vs .19 (g/cm2), p. ≤ .01] than the control group. Additionally, no differences were observed in the amount of food consumed by either group each week [88 (g) vs. 84 (g), p ≥ .05]. CONCLUSION: These findings suggest that whole-body-vibration training may have potential beneficial effects on body composition and BMD at the spine.
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In order to reveal the change rule of vibration acceleration during micro-end-milling straight groove, the single-factor and orthogonal experiments are employed to confirm the influence of milling parameters on vibration acceleration. On this basis, the relation equation between milling parameters and vibration accelerations is built. The result show that, the vibration acceleration along the width of groove is bigger than that of feed direction and it will increase rapidly with the improve of cutting speed; the predicted result of vibration acceleration is in good accordance with test result, therefore the relation equation can be used to predict vibration acceleration.
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Objective: The purpose of this study is to review the hazards of whole body vibration(WBV) and prevent human injuries due to WBV. Background: Vibrations that shake the whole body in vehicles and vessels is WBV. Vibration at a specific frequency, and intensity in the human body can act as a hazard. But, it has not yet done enough research about effects of WBV. Method: We analyzed and reviewed occupational or ergonomic papers published past 30 years. Results: Exposure to whole body vibration can cause permanent physical injury or damage of the nervous system. In addition, it may cause problem in the cardiovascular system, digestive system, musculoskeletal system, endocrine system, reproductive system, and psychological system. The effect of vibration depends on its acceleration, duration, frequency, and direction. Conclusion: WBV-exposed human body experience a high risk of some illnesses such as lumbar spinal disorders. Some workers(bus drivers, truck drivers and heavy equipment operators) are the high risk population exposed to WBV. Application: The results of this study might help to judge and prevent occupational disease caused by WBV.
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[Purpose] Locomotion training is recommended as a countermeasure against locomotive syndrome. Recently, whole-body vibration has been clinically applied in rehabilitation medicine. Therefore, we aimed to investigate the preliminary effectiveness of whole-body vibration on locomotion training. [Participants and Methods] Overall, 28 healthy adult females were randomly assigned to either a locomotion training group using a whole-body vibration device (whole-body vibration group, n=14) or training on the flat floor (non-whole-body vibration group: n=14). Participants conducted two sets of locomotion training twice a day and three times a week for 12 weeks. [Results] A significant difference was observed in the group factor for all outcome measures and in the before and after the training factor for Timed Up and Go test. After the training, knee muscle strength, dynamic balance, and mobility function in the whole-body vibration group were significantly improved compared with the non-whole-body vibration group. In the whole-body vibration group, the Timed Up and Go time after the training was significantly shorter compared with that before training. [Conclusion] The results suggest that locomotion training with whole-body vibration can improve the physical functions in healthy adult females and locomotion training using whole-body vibration might enhance the effectiveness of locomotion training.
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A literature review was performed for the years 1990-2007. It covered reports addressing the problems associated with the prevalence of low back pain and musculoskeletal disorders among farmers. In addition, the anticipated relationship between low back pain and whole body vibration in farmers was evaluated based on 12 reports for the years 1987-2009. The review confirmed that the prevalence of back pain is significantly higher in farmers exposed to whole body vibration than in the control group (not exposed to vibration). The frequency of back pain is related with whole body vibration, as well as with prolonged sitting position, wrong body posture and physical work load (especially lifting and carrying loads). The prevalence of these symptoms increases with the increased vibration dose and duration of exposure. Disorders in the lower section of the spine were associated with age, accidents (concerning the back), cumulative dose of whole body vibration, and overload due to wrong body posture. Long-term exposure affecting the whole body is harmful to the skeletal system (degeneration of the spine). The results of the study suggest that the repeated or constant exposure to mechanical shocks may increase the risk of low back pain. The investigations confirmed that there is a dose-response type of relationship between exposure to whole body vibration and pain in the lumbar section of the spine.
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***Whole body vibration and blood glucose levels in elderly people: a pilot study***AIMS: To evaluate the effect of whole-body vibration therapy on blood glucose levels of elderly people using a vibratory platform.METHODS: The study included volunteers of both genders, aged between 60 and 75 years, without gait disorders or motor disabilities. Individuals with systemic disease, obesity, conflicting treatments, tobacco users, and those who could not understand the maneuvers were excluded. The study consisted of a single session of whole-body vibration. Heart rate, respiratory rate, arterial blood pressure, and blood glucose were obtained for each participant at baseline, immediately before the procedure. Volunteers were then placed in the standing position on the ground of an oscillating platform and treated for 10 min with a frequency of vibration set at 20 Hz (displacement ±6 mm; orbital vibration). Immediately after the whole-body vibration session, all data were collected again. Comparisons were made between baseline and post-treatment data. Normality was tested by Kolmogorov-Smirnov test. Data were analyzed using paired Student’s t-test or Wilcoxon test as appropriate. The level of significance was set at p<0.05.RESULTS: Eleven participants (seven men, four women) participated of the study. The mean age was 64.18±4.37 years. The results showed a significant decrease in the glycemic indexes (p=0.016) and an increase in the respiratory rate (p=0.047) after the whole-body vibration session.CONCLUSIONS: Healthy elderly subjected for 10 minutes to whole-body vibration set at 20 Hz presented reduction of blood glucose levels and increasing of respiratory rate.
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Background: Low back pain is pain due to disc pressure on the nerves that come out through the gap between the vertebrae. Heavy equipment operators have a high risk of developing LBP due to prolonged sitting and vibrations from the machine. This will result in injury and also stiffness in the joints and spine. This study aims to analyze the effect of stretching and whole-body vibration exercise on reducing low back pain in heavy equipment operators/workers. Subjects and Method : This is a meta-analytical study and a systematic review. The articles used were obtained from several electronic databases including Google Scholar, PubMed, Springer Link, Clinical key and ProQuest. The articles used in this study are articles that have been published from 2011-2021. The keywords used in the search were "stretching and low back pain", "stretching and whole body vibration exercise", "stretching and low back pain, "stretching or whole body vibration exercise or low back pain", "stretching or whole body vibration exercise". The article under study is a full text article with a Randomized Controlled Trial (RCT) design, a measure of the relationship used with Mean SD. Articles were collected using the PRISMA diagram, and analyzed using the Review Manager 5.4 . application. Results: Stretching (SMD -0.47; 95% CI=-0.96 to 0.02; p=0.06) and Whole Body Vibration Exercise (SMD -0.37; 95% CI= -0.72 to -0.02; p=0.04) has an effect on reducing Low Back Pain. Conclusion: Stretching exercises and Whole Body Vibration can reduce and decrease lower back pain after getting the intervention. Keywords: Stretching, Low Back Pain, Whole Body Vibration Exercise Correspondence: Melinda Febianca Gaurinindi. Masters Program in Public Health. Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Surakarta 57126, Central Java, Indonesia. Email: melindafebiancaa@gmail.com Mobile: 08996063587. Journal of Epidemiology and Public Health (2021), 06(04): 426-437 https://doi.org/10.26911/jepublichealth.2021.06.04.04
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***Whole body vibration and blood glucose levels in elderly people: a pilot study***AIMS: To evaluate the effect of whole-body vibration therapy on blood glucose levels of elderly people using a vibratory platform.METHODS: The study included volunteers of both genders, aged between 60 and 75 years, without gait disorders or motor disabilities. Individuals with systemic disease, obesity, conflicting treatments, tobacco users, and those who could not understand the maneuvers were excluded. The study consisted of a single session of whole-body vibration. Heart rate, respiratory rate, arterial blood pressure, and blood glucose were obtained for each participant at baseline, immediately before the procedure. Volunteers were then placed in the standing position on the ground of an oscillating platform and treated for 10 min with a frequency of vibration set at 20 Hz (displacement ±6 mm; orbital vibration). Immediately after the whole-body vibration session, all data were collected again. Comparisons were made between baseline and post-treatment data. Normality was tested by Kolmogorov-Smirnov test. Data were analyzed using paired Student’s t-test or Wilcoxon test as appropriate. The level of significance was set at p<0.05.RESULTS: Eleven participants (seven men, four women) participated of the study. The mean age was 64.18±4.37 years. The results showed a significant decrease in the glycemic indexes (p=0.016) and an increase in the respiratory rate (p=0.047) after the whole-body vibration session.CONCLUSIONS: Healthy elderly subjected for 10 minutes to whole-body vibration set at 20 Hz presented reduction of blood glucose levels and increasing of respiratory rate.
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Laboratory-based whole-body vibration studies often involve complex experimental designs, dozens of vibration exposures and multiple sessions. Shortening the test vibration duration would increase experimental efficiency by permitting more trials in the same time period. This study evaluated reported discomfort based on different sinusoidal vibration durations and amounts of rest between successive vibrations. Ten subjects were exposed to four blocks of vibration trials (15/20 second vibration and 5/10 second rest durations). Each block of 37 trials included repeated single axis, planar, and 6 degree of freedom multi-axial vibrations. These repeated trials were analysed to evaluate whether discomfort varied between the different blocks. We did not observe any statistically significant differences in discomfort between the different vibration and rest durations. This finding is useful for designing future vibration experiments. Part II of this study evaluates the relationship between discomfort and vibration exposure.
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