scholarly journals Modeling of Spinal Column of Seated Human Body under Exposure to Whole-Body Vibration

2008 ◽  
Vol 2 (6) ◽  
pp. 1327-1338
Author(s):  
Gen TAMAOKI ◽  
Takuya YOSHIMURA ◽  
Kaoru KURIYAMA ◽  
Kazuma NAKAI
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Spinal Column ◽  
Whole Body ◽  
Body Vibration

scholarly journals Modeling of Spinal Column of Seated Human Body Under Exposure to Whole-body Vibration

2008 ◽  
Vol 74 (741) ◽  
pp. 1322-1332 ◽  
Author(s):  
Gen TAMAOKI ◽  
Takuya YOSHIMURA ◽  
Kaoru KURIYAMA ◽  
Kazuma NAKAI
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Spinal Column ◽  
Whole Body ◽  
Body Vibration

Power Absorbed by the Standing Human Body During Whole-Body Vibration Training

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Naser Nawayseh ◽  
Sadeque Hamdan
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Apparent Mass ◽  
Input Frequency ◽  
Knee Angle ◽  
Body Vibration ◽  
Training Conditions ◽  
Vibration Training ◽  
Whole Body Vibration Training

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.

Transmission of Vertical Whole Body Vibration to the Human Body

2008 ◽  
Vol 23 (8) ◽  
pp. 1318-1325 ◽  
Author(s):  
Juha Kiiski ◽  
Ari Heinonen ◽  
Teppo L Järvinen ◽  
Pekka Kannus ◽  
Harri Sievänen
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Body Vibration

scholarly journals Biodynamics of the human body under whole-body vibration: Synthesis of the reported data

2010 ◽  
Vol 40 (6) ◽  
pp. 710-732 ◽  
Author(s):  
S. Rakheja ◽  
R.G. Dong ◽  
S. Patra ◽  
P.-É. Boileau ◽  
P. Marcotte ◽  
...  
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Body Vibration ◽  
Reported Data

Modelling the apparent mass of the standing human body under whole-body vibration training conditions

2020 ◽  
Vol 234 (7) ◽  
pp. 697-710
Author(s):  
Naser Nawayseh ◽  
Sadeque Hamdan ◽  
Mario Bernardo-Filho ◽  
Redha Taiar
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Design Stage ◽  
Model Parameters ◽  
Apparent Mass ◽  
Body Vibration ◽  
Training Conditions ◽  
Vibration Training ◽  
Whole Body Vibration Training

Several studies have measured the vibration transmitted to and through the human body under vibration training conditions. However, no work has modelled the apparent mass of the human body under such conditions. In this work, a 2 degree-of-freedom model has been developed to predict the apparent mass of the standing human body under whole-body vibration training conditions. The parameters of the model were optimised using measured apparent mass of 12 subjects standing with different knee angle of 180°, 165°, 150° and 135°. Good agreement was found between the predicted and measured apparent mass with errors less than 3 kg in the median apparent mass magnitude and errors less than 6° in the apparent mass phase angle. The medians of the optimised parameters of the 12 individual apparent masses were close to the corresponding optimised parameters of the median apparent mass of the 12 subjects. Compared to standing with extended legs, bending the knees was found to affect mainly the parameters (i.e. stiffness and damping) of the model close to the source of vibration. Bending the knees decreased the mass of the model close to the source of vibration and increased the mass away from the source of vibration. Among the postures with bent knees, the change in the model parameters was generally not significant. The model can be used as a tool by manufacturers of whole-body vibration training machines to test the performance of the machines during the design stage and/or after production. This will decrease the number of experimentations with human subjects which guarantees consistency, repeatability, time-saving and safety.

Biodynamic Responses to Whole-Body Vibration Training: A Systematic Review

2021 ◽  
pp. 1-14
Author(s):  
Naser Nawayseh ◽  
Saleh AlBaiti
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Extensive Literature ◽  
Apparent Mass ◽  
Inclusion Criteria ◽  
Body Vibration ◽  
Extensive Literature Search ◽  
Vibration Training ◽  
Whole Body Vibration Training

In recent years, whole-body vibration (WBV) training has received an increasing interest in the sports and medical fields. However, there has been inconsistency among several studies regarding the effect of WBV training on the human body, which is partly due to the lack of the existence of guidelines for using WBV training machines. To understand the effect of WBV training on the human body and build the needed regulations, it is essential first to understand the biodynamic responses to vibration which represent how vibration is transmitted to and through the human body. The purpose of this study is to systematically review previous studies that measured biodynamic responses when using WBV training machines to highlight inconsistencies in their results and provide possible reasons for them. An extensive literature search was performed on the SCOPUS database to obtain relevant studies. One hundred and fifty-six potentially relevant studies were obtained but after further screening, 23 papers from 2007 to 2020 met inclusion criteria and were included in the study. The papers were analysed with respect to acceleration, transmissibility, interface force, and apparent mass during different vibration settings, body posture, age, and sex. Results and conflicts among studies were highlighted and possible explanations for the inconsistency were provided.

TRANSMISSIBILITY OF WHOLE BODY VIBRATION STIMULI THROUGH HUMAN BODY IN DIFFERENT STANDING POSTURES

2012 ◽  
Vol 12 (03) ◽  
pp. 1250047 ◽  
Author(s):  
LIN YANG ◽  
HE GONG ◽  
MING ZHANG
Keyword(s):  
Knee Joint ◽  
Human Body ◽  
Mechanical Vibration ◽  
Whole Body Vibration ◽  
Interaction Mechanism ◽  
Resonant Peak ◽  
Whole Body ◽  
Vibration Signals ◽  
Body Vibration ◽  
Insight Into

This study focuses on the transmissibility of whole body vibration stimuli through human body in different standing postures to explore the mechanism in which vibration stimuli could be better used as a regimen for bone loss. Five volunteers were guided to stay at three standing postures and imposed of frequency-adjustable vibration stimuli on the plantar surfaces side-alternately. Motion capture system was used to acquire the vibration signals at head, pelvis, knee up, knee down and ankle, from which the transmissibility of vibration stimuli can be obtained. The results showed that transmissibility of vibration stimuli was closely correlated with frequency and skeletal sites. Transmissibility of vibration stimuli in head was much smaller than any other skeletal sites. Transmissibility in the ankle was always in the vicinity of unit one in all the three postures for the vibration stimuli applied side-alternately on the plantar surfaces of both feet. There was an obvious peak around 9 to 11 Hz in the transmissibility curves for knee joint and pelvis. In the resonant peak, transmissibility of vibration stimuli in knee joint and pelvis both exceeded unit one and reached 150%. As the frequency increased after 11 Hz, transmissibility of vibration stimuli decayed rapidly as a function of frequency and dropped to 25% at 30 Hz. This study may help to gain insight into the interaction mechanism between mechanical vibration stimuli and the responses of human musculoskeletal system.

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