Raphael Dumas

Publications (64) View all

• Article: Computation of the mechanical power of a manual wheelchair user in actual conditions: preliminary results.

  C Sauret, P Vaslin, R Dumas, L Cheze, F Lavaste
  Computer Methods in Biomechanics and Biomedical Engineering 09/2012; 15 Suppl 1:173-4. · 0.85 Impact Factor
• Article: Joint and segment coordinate systems revisited.

  R Dumas, T Robert, V Pomero, L Cheze
  Computer Methods in Biomechanics and Biomedical Engineering 09/2012; 15 Suppl 1:183-5. · 0.85 Impact Factor
• Article: Feasibility of incorporating a soft tissue artefact model in multi-body optimisation.

  V Richard, V Camomilla, L Cheze, A Cappozzo, R Dumas
  Computer Methods in Biomechanics and Biomedical Engineering 09/2012; 15 Suppl 1:194-6. · 0.85 Impact Factor
• Article: 3D kinematic of bunched, medium and elongated sprint start.

  J Slawinski, R Dumas, L Cheze, G Ontanon, C Miller, A Mazure-Bonnefoy
  [show abstract] [hide abstract]
  ABSTRACT: The aim of this study was to test the influence of 3 different horizontal distances between the blocks (bunched, medium and elongated) on the velocity of the centre of mass (VCM) and the kinetic energy (KE) of the body segments and of the whole body. 9 well-trained sprinters performed 4 maximal 10 m sprints. An opto-electronic Motion Analysis® system (12 digital cameras 250 Hz) was used to collect the 3D trajectories of 63 markers during the starting block phase. The results demonstrated that the elongated start, compared to the bunched or medium start, induced an increase of VCM at block clearing (2.89±0.13; 2.76±0.11; 2.84±0.14 m.s - 1) and a decrease of the performance at 5 and 10 m. Both results were explained by a greater pushing time on the blocks in the elongated condition. During the starting block phase, the KE of the whole body was greater in the elongated start (324.3±48.0 J vs. 317.4±57.2 J, bunched and 302.1±53.2 J, medium). This greater KE of the whole body was mainly explained by the KE of the head-trunk segments. Thus, to improve the efficiency of the starting block phase, the athlete must produce greater KE of the head and trunk segments in the shortest time.
  International Journal of Sports Medicine 04/2012; 33(7):555-60. · 2.43 Impact Factor
• Source

  Available from: Elke Viehweger

  Article: Sagittal spine posture assessment: feasibility of a protocol based on intersegmental moments.

  B Blondel, V Pomero, B Moal, V Lafage, J-L Jouve, P Tropiano, G Bollini, R Dumas, E Viehweger
  [show abstract] [hide abstract]
  ABSTRACT: Evaluation of spinal posture has recently benefited from the contribution of three-dimensional reconstruction technologies that have helped improve our understanding of this dynamic balance. The aim of this study was to present the preliminary results of a three-dimensional protocol to analyze postural balance. This analytical method is not limited by certain constraints of the radiological approach and evaluates postural balance using a new approach taking into account the net efforts of different intersegmental centers. These preliminary results show the technical feasibility of the protocol. Its future development and clinical use could provide a better understanding of postural balance disorders, and help evaluate the impact of surgical correction on spinal balance.
  Orthopaedics & Traumatology Surgery & Research 02/2012; 98(1):109-13. · 0.94 Impact Factor