Abstract
Static and dynamic components of mechanical impedance of human forearm were evaluated by applying two kinds of perturbations: 1) large viscoelastic loads, and 2) small pseudo-random perturbations. When the task involved the active resistance of the perturbations, both stiffness and viscosity increased relatively to their values in the passive task, the increment in stiffness being larger than that in viscosity. The time course of such changes was investigated during the transition between the two operating points defined by the instructions “do not resist” and “resist” the applied perturbations. The changes in stiffness and viscosity were relatively slow, those in the latter lagging behind those in the former.
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Agarwal, G.C., Gottlieb, G.L.: Compliance of the human ankle joint. J. Biomech. Engrg. 99, 166–170 (1977)
Bizzi, E., Dev, P., Morasso, P., Polit, A.: Effect of load disturbances during centrally initiated movements. J. Neurophysiol. 41, 542–556 (1978)
Buchthal, F., Kaiser, E.: Factors determining tension development in skeletal muscle. Acta Physiol. Scand. 8, 38–74 (1944)
Davies, W.D.T.: System identification for self-adaptive control. London: Wiley 1970
Dufresne, J.R., Soechting, J.F., Terzuolo, C.A.: Electromyographic response to pseudo-random torque disturbances of human forearm position. Neurosci. 3, 1213–1226 (1978)
Dufresne, J.R., Soechting, J.F., Terzuolo, C.A.: Reflex motor output to torque pulses in man: identification of short-and long-latency loops with individual feedback parameters. Neurosci. 4, 1493–1500 (1979)
Dufresne, J.R., Soechting, J.F., Terzuolo, C.A.: Modulation of the myotatic reflex gain in man during intentional movements. Brain Res. 193, 67–84 (1980)
Evans, F.G.: Biochemical studies of the musculo-skeletal system. Springfield, Ill.: C.C. Thomas 1961
Gottlieb, G.L., Agarwal, G.C.: Dependence of human ankle compliance on joint angle. J. Biochem. 11, 177–181 (1978)
Gottlieb, G.L., Agarwal, G.C.: Response to sudden torques about ankle in man. III. Suppression of stretch-evoked responses during phasic contraction. J. Neurophysiol. 44, 233–246 (1980)
Granit, R.: The basis of motor control. London: Academic Press 1970
Houk, J.C.: Participation of reflex mechanisms and reaction time processes in the compensatory adjustments to mechanical disturbances. In: Cerebral motor control in man: long loop mechanisms. Desmedt, J.E. (ed.) Prog. Clin. Neurophysiol. 4, 193–215 (1978)
Houk, J.C., Singer, J.J., Goldman, M.R.: An evaluation of length and force feedback to soleus muscles of decerebrate cats. J. Neurophysiol. 33, 784–811 (1970)
Huxley, A.F., Simmons, R.M.: Mechanical transients and the origin of muscular force. Cold Spr. Harb. Symp. Quant. Biol. 37, 669–680 (1972)
Joyce, G.C., Rack, P.M.H.: Isotonic lengthening and shortening movements of cat soleus muscle. J. Physiol. (London) 204, 475–491 (1969)
Joyce, G.C., Rack, P.M.H., Ross, H.F.: The force generated at the human elbow joint in response to imposed sinusoidal movements of the forearm. J. Physiol. (London) 240, 351–374 (1974)
Mannard, A., Stein, R.B.: Determination of the frequency response of isometric soleus muscle in the cat using random nerve stimulation. J. Physiol. (London) 229, 275–296 (1973)
Marmarelis, V.Z.: Error analysis and optimal estimation procedures in identification of nonlinear Volterra systems. Automat. 15, 161–174 (1979)
Marsden, C.D., Merton, P.A., Morton, H.B.: Servo action in human voluntary movement. Nature 238, 140–143 (1972)
Matthews, P.B.C.: Mammalian muscle spindles and their control actions, 630 pp. Baltimore: Williams and Wilkins 1972
O'Leary, D.P., Honrubia, V.: On-line identification of sensory systems using pseudorandom binary noise inputs. Biophys. J. 15, 505–532 (1975)
Rosenthal, N.P., McKean, T.A., Roberts, W.J., Terzuolo, C.A.: Frequency analysis of stretch reflex and its main subsystems in triceps surae muscles of the cat. J. Neurophysiol. 33, 713–749 (1970)
Soechting, J.F., Dufresne, J.R., Lacquaniti, F.: Time-varying properties of the myotatic response in man during some simple motor tasks. J. Neurophysiol. 46, 1226–1243 (1981)
Soechting, J.F., Roberts, W.J.: Transfer characteristics between EMG activity and muscle tension under isometric conditions in man. J. Physiol. (Paris) 70, 779–793 (1975)
Soechting, J.F., Stewart, P.A., Hawley, R.H., Paslay, P.R., Duffy, J.: Evaluation of neuro-muscular parameters describing human reflex motion. J. Dyn. Syst., Measur. Contr. 93, 195–226 (1971)
Stark, L.: Neurological control systems, 428 pp. New York: Plenum Press 1968
Stein, R.B.: Peripheral control of movement. Physiol. Rev. 54, 215–243 (1974)
Terzuolo, C., Soechting, J.F., Dufresne, J.R.: Operational characteristics of reflex response to changes in muscle length during different motor tasks and their functional utility. In: Brain mechanisms and perceptual awareness. Pompeiano, O., Ajmone Marsan, C. (eds.) pp. 183–210. New York: Raven Press 1981
Vallbo, A.B.: Human muscle spindle discharge during isometric voluntary contractions. Amplitude relations between spindle frequency and torque. Acta Physiol. Scand. 90, 319–336 (1974)
Viviani, P., Berthoz, A.: Dynamics of the head-neck system in response to small perturbations: analysis and modeling in the frequency domain. Biol. Cybern. 19, 19–37 (1975)
Viviani, P., Soechting, J.F., Terzuolo, C.A.: Influence of mechanical properties on the relation between EMG activity and torque. J. Physiol. (Paris) 72, 45–58 (1976)
Viviani, P., Terzuolo, C.A.: Modeling of a simple motor task in man: intentional arrest of an ongoing movement. Kybernetik 14, 35–62 (1973)
Wieneke, G.H., Denier van der Gon, J.J.: Variations in the output impedance of the human motor system. Kybernetik 15, 159–178 (1974)
Wilkie, D.R.: The relation between force and velocity in human muscle. J. Physiol. (London) 110, 249–280 (1950)
Zahalak, G.I., Heyman, S.J.: A quantitative evaluation of the frequency-response characteristics of active human skeletal muscle in vivo. J. Biomech. Eng. 101, 28–37 (1979)
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Lacquaniti, F., Licata, F. & Soechting, J.F. The mechanical behavior of the human forearm in response to transient perturbations. Biol. Cybern. 44, 35–46 (1982). https://doi.org/10.1007/BF00353954
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DOI: https://doi.org/10.1007/BF00353954