Influence of initial forearm position on premotor times (PMTs) of the biceps brachii during an elbow flexion task

Furubayashi, Toshiaki; Kasai, Tatsuya

doi:10.1016/0167-9457(90)90018-9

Cited by 8 publications

(5 citation statements)

References 38 publications

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“…O n the right-hand side in Fig. The EMG activity of several muscles acting on the shoulder angle also varied in a linear fashion with position of the upper limb (Furubayashi & Kasai, 1990). 1, i.e., the torque effect differs and is the largest at a smaller angle of shoulder abduction.…”

Section: Results a N D Discussionmentioning

confidence: 98%

“…3B shows records of a single step-tracking movement associated with bursts of activity in the anterior deltoid (agonist) and the posterior deltoid (antagonist) muscles from different initial angles of shoulder abduction. The EMG activity of several muscles acting on the shoulder angle also varied in a linear fashion with position of the upper limb (Furubayashi & Kasai, 1990). However, we did not observe remarkable EMG changes in the pectoralis major and the latissimus dorsi in accordance with different initial angles of shoulder abduction (not dustrated, but see EMG recordings of left side in Fig.…”

Section: Results a N D Discussionmentioning

confidence: 99%

“…Then, the presence of bursts of muscle activity was determined by visual inspection of data from each trial. The onset of these bursts was identified from visual inspection of trials as the initial activity of the agonist on the EMG (Brown & Cooke, 1981Furubayashi & Kasai, 1990;Hallett & Marsden, 1979;Kasai & Seh, 1992).…”

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confidence: 99%

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Dependence of Deltoid Muscle Activity upon Initial Angles of Shoulder Abduction Prior to Flexion

et al. 1999

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The present study was undertaken to investigate the hypothesis that the direction and selectivity of an appropriately modified version of shoulder flexion is dependent upon initial angles of shoulder abduction. Analysis indicated that initial small angles of shoulder abduction were associated with longer electromyographic (EMG) durations of the agonist (anterior deltoid) muscle. Moreover, as initial angles became smaller, EMG onsets of the antagonist (posterior deltoid muscle) occurred nearer to those of the agonist. Modulations of duration of the agonist EMG activity can be explained by changes in amplitude of movement. Two possible interpretations of the changes of EMG onset of the antagonist in accordance with different initial angles of shoulder abduction are considered. One concerns the effect of the change on the load of the upper limb, dependent on different angles of shoulder abduction. The second concerns the changing role of the antagonist to a synergist, dependent upon decreased initial angles of shoulder abduction prior to the shoulder flexion. Based on the present findings, it is suggested that angles of shoulder abduction are an important determinant of agonist-antagonist muscle activity of the deltoid during flexion of the shoulder.

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Section: Results a N D Discussionmentioning

confidence: 98%

Section: Results a N D Discussionmentioning

confidence: 99%

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Dependence of Deltoid Muscle Activity upon Initial Angles of Shoulder Abduction Prior to Flexion

et al. 1999

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“…The RT of the EMG burst was affected by arm position (Furubayashi & Kasai, 1990), and the MEP amplitude in the hand muscles was affected by forearm position (Mitsuhashi, Seki, Akamatsu, & Handa, 2007), indicating that proprioceptive afferent feedback affects excitability of the motor system. However, corticospinal excitability in the hand muscles decreased during eye movement with visual occlusion irrespective of the forearm position in the present study.…”

Section: Proprioceptive Feedbackmentioning

confidence: 99%

Corticospinal Excitability in the Hand Muscles is Decreased During Eye Movement with Visual Occlusion

et al. 2016

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Corticospinal excitability in the hand muscles decreases during smooth pursuit eye movement. The present study tested a hypothesis that the decrease in corticospinal excitability in the hand muscles at rest during eye movement is not caused by visual feedback but caused by motor commands to the eye muscles. Healthy men (M age = 28.4 yr., SD = 5.2) moved their eyes to the right with visual occlusion (dark goggles) while their arms and hands remained at rest. The motor-evoked potential in the hand muscles was suppressed by 19% in the third quarter of the eye-movement period, supporting a view that motor commands to the eye muscles are the cause of the decrease in corticospinal excitability in the hand muscles. The amount of the suppression was not significantly different among the muscles, indicating that modulation of corticospinal excitability in one muscle induced by eye movement is not dependent on whether eye movement direction and the direction of finger movement when the muscle contracts are identical. Thus, the finding failed to support a hypothetical view that motor commands to the eye muscles concomittantly produce motor commands to the hand muscles. Moreover, the amount of the suppression was not significantly different between the forearm positions, indicating that the suppression was not affected by proprioception of the forearm muscles when visual feedback is absent.

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“…During normal limb position changes, the ensemble of spindles within a muscle dynamically signals a slight distortion of muscle length (13). Furthermore, limb position changes prior to voluntary movement affect the combination of agonist/antagonist muscles involved in the activity and the order in which they are activated (14,15).…”

Section: Introductionmentioning

confidence: 99%

Proprioceptive Neuromuscular Facilitation in Combination with Electrical Stimulation: Combined Treatment in Comparison to Each Treatment Alone

Munih

Obreza

et al. 2004

Neuromodulation: Technology at the Neural Interface

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Influence of initial forearm position on premotor times (PMTs) of the biceps brachii during an elbow flexion task

Cited by 8 publications

References 38 publications

Dependence of Deltoid Muscle Activity upon Initial Angles of Shoulder Abduction Prior to Flexion

Dependence of Deltoid Muscle Activity upon Initial Angles of Shoulder Abduction Prior to Flexion

Corticospinal Excitability in the Hand Muscles is Decreased During Eye Movement with Visual Occlusion

Proprioceptive Neuromuscular Facilitation in Combination with Electrical Stimulation: Combined Treatment in Comparison to Each Treatment Alone

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