PubMed · 6016562
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F R Finley, R W Wirta. 1967. Myocoder-computer study of electromyographic patterns.. https://pubmed.ncbi.nlm.nih.gov/6016562/
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We report on a girl with Langer-Giedion syndrome or tricho-rhino-phalangeal syndrome, type II (TRPS II) with deletion on 8q, and the unusual findings of bilateral tibial hemimelia and unilateral absence of the ulna. An 8-year-old boy with TRPS II with bilateral tibial hemimelia was reported by Turleau et al. [1982: Hum. Genet. 62:183-187]. The critical region for TRPS II is 8q24.1. Although no genes involving limb development in the human have been identified in this region, two mouse syndromes are localized to the homologous chromosome region of 9A1-A4 which involve limb abnormalities. We propose that a gene involved in limb development is contiguous with the TRPS II gene which, when deleted, may cause tibial hemimelia.
Six sitting healthy subjects were instructed to keep a constant upper limb posture while performing wrist flexions and extensions. Acceleration of the wrist, elbow and shoulder joints, and surface electromyograms (EMGs) of the upper limb's main flexors and extensors were studied. Results indicated the existence of anticipatory (APA) and corrective postural adjustments. The APAs were based on a reproducible directional chronology of postural muscle activations. As shown by a simple mechanical model, this chronology was in accordance with the muscular torque which should be applied to the joints to keep the upper limb posture constant. All these data indicate that APA are involved in segmental posture, where their general organization is similar to those of APA associated with whole-body movements. The use of constant directional postural synergies well agrees with a simplification of the motor control according to Bernstein's theory.
Segmentation of apparently continuous movement has been reported for over a century by human movement researchers, but the existence of primitive submovements has never been proved. In 20 patients recovering from a single cerebral vascular accident (stroke), we identified the apparent submovements that composed a continuous arm motion in an unloaded task. Kinematic analysis demonstrated a submovement speed profile that was invariant across patients with different brain lesions and provided experimental verification of the detailed shape of primitive submovements. The submovement shape was unaffected by its peak speed, and to test further the invariance of shape with speed, we analyzed movement behavior in a patient with myoclonus. This patient occasionally made involuntary shock-like arm movements, which occurred near the maximum capacity of the neuromuscular system, exhibited speed profiles that were comparable to those identified in stroke patients, and were also independent of speed.