Shock Waves

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The influence of the number of shock waves and the energy flux density on the Raman spectrum of collagen type I from rat

  • J. J. Cárcamo-VegaEmail author
  • M. R. Brañes
  • A. M. LoskeEmail author
  • M. M. Campos-Vallette
Original Article


Shock waves are used to treat musculoskeletal injuries and trigger the body’s mechanisms to initiate healing; however, the cellular and molecular working mechanisms are not fully known. Raman spectroscopy may be a useful tool to provide information on structural changes. Solid collagen type I from rat tail (> 90% pure) was suspended in water and was exposed in vitro to different numbers of shock waves and energy flux densities. Raman spectra were recorded at 2 h, 1 week, and 3 weeks after shock-wave treatment. The spectral analysis indicated that varying the number of shock waves and the energy flux density induced molecular changes in the collagen structure. Varying the energy flux density induced more significant changes than modifying the number of shock waves; however, in most cases, the collagen recovered its original conformation 3 weeks after treatment. A significant decrease in the relative intensities of the conformational bands, which include amide I, amide III, and stretching C–C, was observed at different energy flux densities. In many clinical cases, the natural repair of tissue is improved after shock-wave treatment. Raman spectroscopy revealed that varying the energy flux density of the shock waves applied to rat collagen type I induced strong conformational molecular changes. Approximately 2–3 weeks after shock-wave treatment, a phase of “molecular ordering” tending to a “recovering molecular sequence repair” was observed.


Extracorporeal shock-wave therapy Collagen type I Raman spectroscopy Energy flux density Musculoskeletal injuries Shock-wave-induced mechanotransduction 



Ricardo Aroca and Francisco Fernández are acknowledged for revision of the manuscript. This work was financially supported by the “Fondo Nacional de Desarrollo Científico y Tecnológico” (FONDECYT) of Chile (Project No. 11140262).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Laboratorio de Análisis e Investigaciones Arqueométricas, Instituto de Alta Investigación (IAI)Universidad de TarapacáAricaChile
  2. 2.Laboratorio de Espectroscopía Vibracional, Facultad de CienciasUniversidad de ChileÑuñoaChile
  3. 3.Centro de Física Aplicada y Tecnología AvanzadaUniversidad Nacional Autónoma de MéxicoQuerétaroMexico

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