Effect of vibration magnitude, vibration spectrum and muscle tension on apparent mass and cross axis transfer functions during whole-body vibration exposure

Mansfield, Neil J.; Holmlund, P.; Lundström, Ronnie; Lenzuni, P.; Nataletti, Pietro

doi:10.1016/j.jbiomech.2005.09.024

Cited by 31 publications

(23 citation statements)

References 16 publications

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“…Therefore, changes in transmissibility reported in this study may not strictly be due to changes in frequency, since vibration exposure magnitude also increased when exposure frequency increased. Furthermore, several researchers have reported transmissibility increases with increasing magnitude [9,36,37]. Second, although participants' foot placement was controlled and all were given the same instruction with regard to how to stand, it could not be confirmed that all participants' maintained the same posture throughout the 45-second FTV exposure period.…”

Section: Limitations Of the Studymentioning

confidence: 95%

“…Second, although participants' foot placement was controlled and all were given the same instruction with regard to how to stand, it could not be confirmed that all participants' maintained the same posture throughout the 45-second FTV exposure period. Deviations in posture can influence vibration transmissibility due to changes in the surface contact area with the vibrating surface, which can influence the position of the bony structures and the degree of tension in different muscle groups of the trunk and the extremities, in turn changing the resonant frequency of the body structure [1,19,21,25,36,[38][39][40][41]. Thus, variations in the ankle and knee angles could have influenced the transmission of vibration from the platform through the feet and into the lower limbs.…”

Section: Limitations Of the Studymentioning

confidence: 99%

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Study of the biodynamic response of the foot to vibration exposure

Goggins

Godwin

Larivière

et al. 2016

OER

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Abstract.BACKGROUND: Exposure to foot-transmitted vibration (FTV) has been linked to injury; however, the biodynamic response of the foot to FTV has not been quantified. OBJECTIVE: The objective was to measure vibration transmissibility from the floor-to-ankle, and the floor-to-metatarsal, during exposure to FTV while standing, and to determine if FTV exposure frequency, or participant mass or arch index (AI) influence the transmission of FTV through the foot. METHODS: Participants' AI was measured. Four ADXL326, tri-axial accelerometers were utilized to measure vibration on the platform medial to distal head of first metatarsal, on the distal head of first metatarsal, on the platform paralleling the medial malleolus, and on the lateral malleolus. Participants were randomly exposed to FTV at 25 Hz, 30 Hz, 35 Hz, 40 Hz, 45 Hz, and 50 Hz for 45 seconds. CONCLUSIONS:The greatest transmissibility magnitude measured at the metatarsal and ankle occurred at 50 Hz and 25-30 Hz respectively, suggesting the formation of a local resonance at each location.

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Section: Limitations Of the Studymentioning

confidence: 95%

Section: Limitations Of the Studymentioning

confidence: 99%

Study of the biodynamic response of the foot to vibration exposure

Goggins

Godwin

Larivière

et al. 2016

OER

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“…Knee flexion increases the tension on the posterior muscles of the lower limbs, with a positive impact on the action of the plantar flexor muscles, in this case the triceps surae, which results in greater attenuation of vibration 25 . Greater activation of these muscles as a result of knee and hip flexion seems to permit a more intensified participation in the attenuation of vibrations, which continue to propagate after induction of the triceps surae, reducing the vibratory range and resulting in lower accelerations to the trunk and head.…”

Section: Discussionmentioning

confidence: 99%

“…The definition of the WBV protocol used here was based on protocols described in the literature 12,20,24,25 . Thus, the data were recorded at vibration frequencies of 20, 35, 50 and 70 Hz and displacement amplitudes of 2.0 and 6.0 mm.…”

Section: Whole-body Vibration Protocolmentioning

confidence: 99%

A interferência da posição corporal na transmissibilidade vibratória durante o treinamento com plataforma vibratória

Vasconcellos

Schütz

Santos

2014

Rev. Bras. Cineantropom. Desempenho Hum.

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-Whole-body vibration training on vibrating platforms is widely used for physical exercise, health promotion and physical rehabilitation. The position on the platform is one of the factors responsible for the transmission of vibrations to the body segments of individuals. Therefore, the objective of this study was to compare the characteristics of vibrations transmitted to the body segments of adults between two body positions and different vibration intensities. Twenty intentionally selected subjects (10 men and 10 women), with a mean age of 27.8 ± 2.9 years, participated in the study. The data were acquired with a triaxial accelerometer attached to the subject's body using a vibrating platform at frequencies of 20, 35, 50, and 70 Hz and displacement amplitudes of 2.0 and 6.0 mm in the extended and flexed positions. Descriptive and inferential statistics was applied (p ≤ 0.05). Significant differences in the vibration magnitude and transmissibility were observed between body positions at all intensities analyzed, with greater attenuation of vibrations in the flexed position, especially during passage of the vibratory stimulus through the lower limbs. It was concluded that the body position adopted by the subjects on the vibrating platform directly affects the transmission of vibration. The flexed position was found to be the most suitable for the application of this training method by ensuring better body stability on the platform and promoting more effective attenuation of vibrations, thus preventing the occurrence of unintended acceleration in the head. Key words: Accelerometry; Transmissibility; Vibration. Resumo -O treinamento vibratório de corpo inteiro sobre plataformas vibratórias tem sido muito difundido nos contextos do treinamento físico, promoção da saúde e reabilitação física, sendo o posicionamento sobre a plataforma um dos fatores responsáveis pela transmissão das vibrações às estruturas corporais dos indivíduos. Desta forma, o objetivo geral deste estudo foi comparar as características das vibrações transmitidas às estruturas corporais de adultos em

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“…Other postural and environmental factors have also been found to affect the vertical apparent mass at the seat surface, including seat pan inclination 9,24) , the frequency of vibration 25) , and the thickness of backrest foam 11) . Although the influence of these factors on apparent mass may sometimes be small relative to the influence of other factors investigated here, systematic investigations are appropriate to better understand the influence of all factors influencing apparent mass and its practical applications.…”

Section: Model Limitationsmentioning

confidence: 99%