Erik Simonsen Lab

This lab concentrates on human experiments and mostly on freely moving humans under unrestricted dynamic conditions.

Group leader

Associate Professor Erik Simonsen

Department of Neuroscience
The Panum Institute, room 33-3-66

Phone: +45 2875 7230

Research Focus

This lab concentrates on human experiments and mostly on freely moving humans under unrestricted dynamic conditions.

Biomechanical movement analysis is mainly conducted during walking in a specialized gaitlab. Reflective markers are placed on anatomical landmarks on the subject dividing the body into a number of rigid segments. The markers are digitized online in three dimensions and combined with ground reaction forces measured under the feet joint moments can be calculated about anatomical axes.

Joint moments are interesting as they represent a quantification of the muscle forces driving the actual movement.

Electromyography (EMG) during movement is often combined with biomechanical movement analysis. The EMG recordings can be either with wires or wireless through a Bluetooth device.

A specialty of this lab is the ability to combine neurophysiological methods with biomechanics. The Hoffmann reflex (H-reflex) in m. soleus is modulated during e.g. walking, so that the reflex is facilitated during the contact phase but inhibited during the swing phase of the walking cycle.

Key Publications

  • Raffalt PC, Alkjær T, Simonsen EB. 2016. Joint dynamics and intra-subjects variability during countermovement jumps in children and adults. J Biomech, 49(13): 2968-2974.
  • Raffalt PC, Alkjaer T, Simonsen EB. 2015. Changes in soleus H-reflex during walking in middle-aged healthy subjects. Muscle Nerve;51(3):419-25.
  • Simonsen EB. 2014. Contributions to the understanding of gait control. Dan Med J, 61(4), B4823.
  • Sandau M, Koblauch H, Moeslund TB, Aanæs H, Alkjær T, Simonsen EB. 2014.Markerless motion capture can provide reliable 3D gait kinematics in the sagittal and frontal plane. Med Eng Phys. 2014 Sep;36(9):1168-75.
  • Nikolajsen HH, Larsen PK, Simonsen EB, Alkjaer T, Falkerslev S, Kristensen JH, Jensen BR, Remvig L, Juul-Kristensen B. 2013. Gait pattern in 9-11-year-old children with generalized joint hypermobility compared with controls; a cross-sectional study. BMC Musculoskeletal Disorders, 14(1):341.
  • Simonsen EB, Alkjær T, Raffalt PC. 2012. Reflex response and control of the human soleus and gastrocnemius muscles during walking and running at increasing velocity. Experimental Brain Research, 219(2), pp 163-74.
  • Simonsen EB, Cappelen KL, ί Skorini R, Larsen PK, Alkjær T, Dyhre-Poulsen P. 2012. Explanations pertaining to the hip joint flexor moment during the stance phase of human walking. Journal of Applied Biomechanics, 28(5), pp 542-50.
  • Simonsen EB, Alkjær T. The variability problem of normal human walking. 2012. Medical Engineering and Physics, 34(2), pp 219-24.
  • Simonsen EB, Svendsen MB, Nørreslet A, Baldvinsson HK, Heilskov-Hansen T, Larsen PK, Alkjær T, Henriksen M. 2012. Walking on high heels changes the dynamics and muscle activity of human walking significantly. Journal of Applied Biomechanics, 28(1), pp 20-8.
  • Simonsen EB & Dyhre-Poulsen P. Amplitude of the soleus H reflex during walking and running. 1999. J. Physiology, 515, pp 929-939.
  • Simonsen EB, Dyhre-Poulsen P, Alkjaer T, Aagaard P & Magnusson SP. Inter-individual differences in H reflex modulation during normal walking. 2002. Exp. Brain Research, 142(1), pp 108-115.
  • Aagaard P. Simonsen EB, Andersen JL, Magnusson P & Dyhre-Poulsen P. Neural adaptation to strength training: changes in evoked V- and H-reflex responses. 2002, J. Appl. Physiol., 92(6), pp 2309-2318.
  • Dyhre-Poulsen P., Simonsen E. B., Voigt M. Dynamic control of muscle stiffness and H reflex modulation during hopping and jumping in man. J Physiol (Lond), 437, pp 287-304, 1991.