3D Transmissibility and Relative Transmissibility of Immobilized Supine Humans during Transportation

The three-dimensional translational multi-input/output relative transmissibility and the transmissibility of supine humans during transportation were introduced in this work and were compared with the single-axis input/output condition. Eight healthy subjects were tested under multi-axis input/output whole-body vibration of white noise random signals with frequency content of 0.5–20 Hz and vibration magnitude of 1 m/s2 RMS applied at the platform level, considering three immobilization conditions: rigid-platform, litter-board, and litter-board-collar. The results showed the diagonal components of the multi-axis input/out transmissibility and relative transmissibility to be considerably larger than their out-of-diagonal components. Significant correlations (R2 > 0.93) were found between the diagonal components of the transmissibility of the multi-axis input/output and those of the individual single-axis input/output whole-body vibrations; however, weaker correlation (R2 > 0.11) was shown between their cross-axis components.

[1]  Michael J. Griffin,et al.  Power absorbed during whole-body vertical vibration: Effects of sitting posture, backrest, and footrest , 2010 .

[2]  Michael J. Griffin,et al.  Nonlinear dual-axis biodynamic response of the semi-supine human body during vertical whole-body vibration , 2008 .

[3]  M E Lovell,et al.  A review of seven support surfaces with emphasis on their protection of the spinally injured. , 1996, Journal of accident & emergency medicine.

[4]  M Hauswald,et al.  M AXIMIZING C OMFORT AND M INIMIZING I SCHEMIA : A C OMPARISON OF F OUR M ETHODS OF S PINAL I MMOBILIZATION , 2000, Prehospital emergency care : official journal of the National Association of EMS Physicians and the National Association of State EMS Directors.

[5]  R. Silbergleit,et al.  Forces acting during air and ground transport on patients stabilized by standard immobilization techniques. , 1991, Annals of emergency medicine.

[6]  Neil J Mansfield,et al.  Impedance methods (apparent mass, driving point mechanical impedance and absorbed power) for assessment of the biomechanical response of the seated person to whole-body vibration. , 2005, Industrial health.

[7]  Michael J. Griffin,et al.  Handbook of Human Vibration , 1990 .

[8]  Neil J. Mans,et al.  Non-linearities in apparent mass and transmissibility during exposure to whole-body vertical vibration , 2000 .

[9]  E. Albertia,et al.  Whole body vibration in mountain-rescue operations , 2006 .

[10]  Marcello Pagano,et al.  Principles of Biostatistics , 1992 .

[11]  Michael J. Griffin,et al.  Nonlinear dual-axis biodynamic response of the semi-supine human body during longitudinal horizontal whole-body vibration , 2008 .

[12]  D. Newland.  An introduction to random vibrations and spectral analysis , 1975 .

[13]  B. E. Maki,et al.  The efficacy of head immobilization techniques during simulated vehicle motion. , 1999, Spine.

[14]  R Lundström,et al.  Mechanical impedance of the human body in vertical direction. , 2000, Applied ergonomics.

[15]  Michael J. Griffin,et al.  Fore-and-aft apparent mass of the back: Nonlinearity and variation with vertical location , 2008 .

[16]  R. Lehman,et al.  Spine immobilization: prehospitalization to final destination. , 2011, Journal of surgical orthopaedic advances.

[17]  Salam Rahmatalla,et al.  Whole-body vibration transmissibility in supine humans: effects of board litter and neck collar. , 2014, Applied ergonomics.

[18]  N. Mansfield,et al.  The apparent mass of the seated human exposed to single-axis and multi-axis whole-body vibration. , 2007, Journal of Biomechanics.

[19]  Michael J. Griffin,et al.  A REVIEW OF THE TRANSMISSION OF TRANSLATIONAL SEAT VIBRATION TO THE HEAD , 1998 .

[20]  Salam Rahmatalla,et al.  Comprehensive Measurement in Whole-Body Vibration , 2012 .

[21]  Michael J. Griffin,et al.  Nonlinearity in apparent mass and transmissibility of the supine human body during vertical whole-body vibration , 2009 .

[22]  Subhash Rakheja,et al.  Influence of back support conditions on the apparent mass of seated occupants under horizontal vibration. , 2005, Industrial health.

[23]  John Meusch,et al.  Supine human response and vibration-suppression during whole-body vibration , 2012 .

[24]  S. Rakheja,et al.  Relationship between measured apparent mass and seat-to-head transmissibility responses of seated occupants exposed to vertical vibration , 2008 .

[25]  M. Fehlings,et al.  Pre-hospital care management of a potential spinal cord injured patient: a systematic review of the literature and evidence-based guidelines. , 2011, Journal of neurotrauma.