A whole body vibration perception map and associated acceleration loads at the lower leg, hip and head

Humans perceive whole-body vibration in many daily life situations. Often they are exposed to whole-body vibration in combination with acoustic events. Sound and vibration usually stems from the same source, for example concerts or travelling in vehicles, such as automobile, aircrafts, or ships. While we can describe acoustic stimuli using psychoacoustic descriptors such as loudness or timbre, the description human perception of whole body vibration frequently has been reduced to comfort or quality in the past. Unlike loudness or timbre, comfort and quality are dependent on the overall context. Especially in vehicles expectations might differ lot between different vehicle classes. Previous studies have evaluated a large range of suitable descriptors for whole-body vibrations that are independent of context. They suggest that certain descriptors are driven to a large extend by the frequency content of the vibration. This study systematically investigates the influence of frequency content on the perception of whole-body vibration varying frequency content and intensity of the vibrations. The results verify the frequency dependence of specific descriptors and identify the respective frequency ranges.

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Whole-Body Vibration Perception Thresholds of Recumbent Subjects. Part 2. Effect of vibration Direction.

Industrial Health ◽

10.2486/indhealth.37.404 ◽

1999 ◽

Vol 37 (4) ◽

pp. 404-414 ◽

Cited By ~ 2

Author(s):

Setsuo MAEDA ◽

Yoshiharu YONEKAWA ◽

Kazuo KANADA ◽

Yukio TAKAHASHI

Keyword(s):

Whole Body Vibration ◽

Whole Body ◽

Vibration Direction ◽

Body Vibration ◽

Vibration Perception

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Effect of whole body vibration on intracompartmental pressure in the lower leg

Journal of Orthopaedic Science ◽

10.1007/s00776-009-1379-y ◽

2009 ◽

Vol 14 (5) ◽

pp. 618-622 ◽

Cited By ~ 4

Author(s):

Annelies Van Erck ◽

Luc Vanden Bossche ◽

Erik Witvrouw ◽

Vicky Van der Kelen ◽

Iris Wojtowicz ◽

...

Keyword(s):

Whole Body Vibration ◽

Lower Leg ◽

Whole Body ◽

Intracompartmental Pressure ◽

Body Vibration

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Dynamic analysis of lower leg muscles response to whole body vibration stimulation at different frequencies and postures: implications for training

10.1101/2021.08.31.458312 ◽

2021 ◽

Author(s):

Isotta Rigoni ◽

Tecla Bonci ◽

Paolo Bifulco ◽

Antonio Fratini

Keyword(s):

Whole Body Vibration ◽

Lower Leg ◽

Whole Body ◽

Vibratory Stimulation ◽

Muscle Response ◽

Body Vibration ◽

Leg Muscles ◽

Lower Limb Muscles ◽

Neuromuscular Response ◽

Gastrocnemius Lateralis

AbstractPurposeTo characterise the mechanical and neuromuscular response of lower limb muscles in subjects undergoing Whole Body Vibration (WBV) at different frequencies while holding two static postures.MethodsTwenty-five participants underwent WBV at 15, 20, 25 and 30 Hz while holding a static ‘hack squat’ and on ‘fore feet’ posture. Surface electromyography (sEMG) and soft tissue accelerations were collected from Gastrocnemius Lateralis (GL), Soleus (SOL) and Tibialis Anterior (TA) muscles.ResultsOnly specific WBV settings led to a significant increase in muscle contraction. Specifically, the WBV-induced activation of SOL and GL was maximal in fore-feet and in response to higher frequencies. Estimated displacement at muscle bellies revealed a resonant pattern never highlighted before. After stimulation starts, muscle oscillation reaches a peak followed by a drop and a further stabilisation (few seconds after the peak) that suggests the occurrence of a neuromuscular activation to reduce the vibration-induced oscillation.ConclusionLower leg muscles need a response time to tune to a vibratory stimulation, which discourages the use of dynamic exercises on vibrating platforms. To maximize calf muscle response to WBVs, a stimulation frequency in the range of 25-30 Hz and an ‘on fore feet’ posture are recommended.

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