Analysis of the electromyographic activity of human elbow joint muscles during slow linear flexion movements in isotorque conditions

Tal'nov, A. N.; Serenko, S. G.; Страфун, С.С.; Kostyukov, A. I.

doi:10.1016/s0306-4522(98)00478-3

Cited by 18 publications

(19 citation statements)

References 15 publications

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“…The steering movement has been repeated 5 times and mean signal values have been computed. After the tests the muscular activity signals have been filtered with a lowpass filter (Yamazaki et al, 1995) in order to smooth them and they have been rescaled to the maximum isometric peak according to (Tal'Nov et al, 1999). Figs.…”

Section: Simulation Results and Experimental Testsmentioning

confidence: 99%

Virtual musculo-skeletal model for the biomechanical analysis of the upper limb

Pennestrı̀

Stefanelli

Valentini

et al. 2007

Journal of Biomechanics

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Section: Simulation Results and Experimental Testsmentioning

confidence: 99%

Virtual musculo-skeletal model for the biomechanical analysis of the upper limb

Pennestrı̀

Stefanelli

Valentini

et al. 2007

Journal of Biomechanics

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“…Rather powerful accompanying activation of extensors of the elbow joint, i.e., coactivation of the antagonist muscles, is, as a rule, observed in the movements related to flexion of the elbow joint and realized with no fixation of the shoulder; such a pattern has rather frequently been used for the analysis of single-joint movements [6,7]. At the same time, when the shoulder was fixed by an external force, and flexion of the elbow joint was performed against the action of an external extending loading, activation of the extensor muscles was insignificant [5][6][7].…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, when the shoulder was fixed by an external force, and flexion of the elbow joint was performed against the action of an external extending loading, activation of the extensor muscles was insignificant [5][6][7]. A mostly coactivatory pattern of the muscle activity in flexor movements was recorded independently of the consequence of the movements, i.e., of the performance of the forearm movement before or after the movement in the shoulder joint (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In our experiments, we recorded EMGs only from a small part of the activity of this complex. Earlier, when we examined tracking movements in the elbow joint, we mentioned the probability of redistribution of the activity among different antagonist muscles in the course of realization of identical motor programs [6].…”

Section: Discussionmentioning

confidence: 99%

“…In our earlier publications, we described some peculiarities of central activation of these muscles providing singlejoint movements in the elbow joint under conditions of immobilization of the shoulder and absence of the angle changes in the shoulder joint [5][6][7]. In fact, the above muscles are, respectively, flexors and extensors of both joints; thus, it can be supposed that central motor commands (CMCs) coming to these muscles in the course of two-joint movements differ significantly from commands providing local movements in the elbow joint.…”

Section: Introductionmentioning

confidence: 99%

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Peculiarities of Activation of Muscles of the Shoulder Belt in Voluntary Two-Joint Movements of the Upper Limb

et al. 2009

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We studied coordination of central motor commands (СMCs) coming to muscles of the shoulder and shoulder belt in the course of single-joint and two-joint movements including flexion and extension of the elbow and shoulder joints. Characteristics of rectified and averaged EMGs recorded from a few muscles of the upper limb were considered correlates of the CMC parameters. Special attention was paid to coordination of CMCs coming to two-joint muscles that are able to function as common flexors (m. biceps brachii, caput breve, BBcb) and common extensors (m. triceps brachii, caput longum, TBcl) of the elbow and shoulder joints. Upper limb movements used in the tests included planar shifts of the arm from one spatial point to another resulting from either simultaneous changes in the angles of the shoulder and elbow joints or isolated sequential (two-stage) changes in these joint angles. As was found, shoulder muscles providing movements of the elbow with changes in the angle of the elbow joint, i.e., BBcb and TBcl, were also intensely involved in the performance of single-joint movements in the shoulder joint. The CMCs coming to two-joint muscles in the course of two-joint movements appeared, in the first approximation, as sums of the commands received by these muscles in the course of corresponding single-joint movements in the elbow and shoulder joints. Therefore, if we interpret the isolated forearm movement performed due to a change in the angle of the elbow joint as the main motor event, while the shoulder movement is considered the accessory one, we can conclude that realization of a two-joint movement of the upper-limb distal part is based on superposition of CMCs related to basic movements (main and accessory).Keywords: two-joint movement of the upper limb, elbow joint, shoulder joint, muscles of the shoulder and shoulder belt, superposition of central motor commands.

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