Apparent mass of the standing human body when using a whole-body vibration training machine: Effect of knee angle and input frequency

Nawayseh, Naser; Hamdan, Sadeque

doi:10.1016/j.jbiomech.2018.11.003

Cited by 19 publications

(28 citation statements)

References 39 publications

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“…affects fundamental anatomical regions such as the pelvis and the lumbar spine. The vibration transmissibility decreased with increased frequency of excitation, which is consistent with static posture in previously published literature (Matsumoto and Griffin, 1998;Nawayseh and Hamdan, 2019). In our tests, the input vibration was amplified below 5 Hz at the lumbar spine and the knee.…”

Section: Vibration Transmissibilitysupporting

confidence: 91%

Vibration transmissibility and apparent mass changes from vertical whole-body vibration exposure during stationary and propelled walking

et al. 2021

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Whole-Body Vibration (WBV) is an occupational hazard affecting employees working with transportation, construction or heavy machinery. To minimize vibration-induced pathologies, ISO identified WBV exposure limits based on vibration transmissibility and apparent mass studies. The ISO guidelines do not account for variations in posture or movement. In our study, we measured the transmissibility and apparent mass at the mouth, lower back, and leg of participants during stationary and propelled walking. Stationary walking transmissibility was significantly higher at the lumbar spine and bite bar at 5 and 10 Hz compared to all higher frequencies while the distal tibia was lower at 5 Hz compared to 10 and 15 Hz. Propelled walking transmissibility was significantly higher at the bite bar and knee at 2 Hz than all higher frequencies. These results vary from previously published transmissibility values for static participants, showing that ISO standards should be adjusted for active workers.

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Section: Vibration Transmissibilitysupporting

confidence: 91%

Vibration transmissibility and apparent mass changes from vertical whole-body vibration exposure during stationary and propelled walking

et al. 2021

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“…The experiment used to calibrate the parameters of the model is described in detail by Nawayseh and Hamdan. 9 However, a brief description will be presented in this section for convenience.…”

Section: Methodsmentioning

confidence: 99%

“…An experiment to study the effect of knee angle on the AM during WBV training is reported by Nawayseh and Hamdan. 9 Twelve male subjects with average mass 74.7 (58-87) kg, standing height 1.77 (1.60-1.86) m and age 22.5 (18)(19)(20)(21)(22)(23)(24)(25)(26) years took part in the experiment. A WBV training machine (Model TO-600, The One Fitness Co, Ltd) that produces high magnitude of vertical sinusoidal motions was used to produce the vibration.…”

Section: Methodsmentioning

confidence: 99%

“…The input acceleration of the vibrating plate generally increased with frequency and was found to depend, to some extent, on the adopted posture and the subject (Table 1) as discussed in details in the published experimental results by Nawayseh and Hamdan. 9 Each subject stood barefooted on a force platform (Vernier FP-BTA) mounted on the vibrating plate of the machine and was exposed to 32 combinations of posture and input frequency (eight frequencies and four postures). The difference between the four postures was the angle of the knee: angles of 180°, 165°, 150°and 135°between the upper and lower legs were used.…”

Section: Methodsmentioning

confidence: 99%

“…The body AM/mechanical impedance shows how vibration is transmitted to the human body while the transmissibility shows how vibration is transmitted through the human body. [7][8][9][10][11] Hence, the AM/ mechanical impedance is calculated as the ratio of the force to acceleration (velocity in the case of mechanical impedance) measured at the interface between the human body and the vibrating surface. The transmissibility, however, is calculated as the ratio between two measures of the same type (e.g.…”

Section: Introductionmentioning

confidence: 99%

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

Nawayseh

Hamdan

Bernardo-Filho

et al. 2020

Proc Inst Mech Eng H

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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.

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Modeling of the Vertical Dynamics of a Kick e-Scooter on Distributed Road Irregularity

Asperti

Vignati²,

Braghin³

2022

Lecture Notes in Mechanical Engineering

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Apparent mass of the standing human body when using a whole-body vibration training machine: Effect of knee angle and input frequency

Cited by 19 publications

References 39 publications

Vibration transmissibility and apparent mass changes from vertical whole-body vibration exposure during stationary and propelled walking

Vibration transmissibility and apparent mass changes from vertical whole-body vibration exposure during stationary and propelled walking

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

Modeling of the Vertical Dynamics of a Kick e-Scooter on Distributed Road Irregularity

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