Torque-frequency relationships were obtained at 30 degrees, 90 degrees, and optimum angle. Optimum angle was not different between groups but SCI-normalized torques were lower at the extreme angles. At all angles, SCI muscles produced higher relative torques at low stimulation frequencies. Thus, there was no evidence of a consistent change in the length of paralyzed SCI muscles, and the anomalous leftward shift in the torque-frequency relationship was not the result of testing the muscle at a relatively long length. The results provide valuable information about muscle changes occurring in various neurological disorders.
This research was carried out in Amsterdam but was a collaboration by the two research groups led by Professor Anthony J Sargeant – one group was based in the UK and other in The Netherlands.
Influence of knee joint angle on muscle properties of paralyzed and nonparalyzed human knee extensors.
Muscle Nerve. 2005 Jul;32(1):73-80
Karin H Gerrits, Constantinos N Maganaris, Neil D Reeves, Anthony J Sargeant, David A Jones, Arnold de Haan
Institute for Fundamental and Clinical Human Movement Sciences, Vrije University, van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands.