We tested the hypothesis that the neural networks for walking in the mudpuppy can be divided into a flexor and an extensor center, each of which contains collections of interneurons localized in the vicinity of their motoneuron pools. Combining a battery of techniques, we identified and localized the elbow flexor center and its motoneuron pool in the C2 segment and the elbow extensor center and...

Stiffness properties of the musculo-skeletal system can be controlled by regulating muscle activation and neural feedback gain. To understand the regulation of multijoint stiffness, we examined the relationship between human arm joint stiffness and muscle activation during static force control in the horizontal plane by means of surface electromyographic (EMG) studies. Subjects were asked to pr...

BACKGROUND Measuring the strength of individual foot muscles is very challenging; however, measuring muscle morphology has been shown to be associated with strength. A reliable method of assessing foot muscle atrophy and hypertrophy would therefore be beneficial to researchers and clinicians. Thus, the aim of this study was to evaluate the test-retest intra-observer reliability of ultrasound to...

This study examined the influence of proprioceptive input from hip flexor muscles on the activity in hip flexors during the swing phase of walking in the decerebrate cat. One hindlimb was partially denervated to remove cutaneous input and afferent input from most other hindlimb muscles. Perturbations to hip movement were applied either by 1) manual resistance or assistance to swing or by 2) res...

OBJECTIVE To demonstrate delayed-onset muscle soreness (DOMS) is a suitable model for the study of movement-evoked pain, we attempted to identify brain regions specifically involved in pain evoked by active and dynamic movement under DOMS condition. SUBJECT Twelve healthy volunteers METHODS DOMS was induced in the left upper-arm flexor muscles by an eccentric elbow contraction exercise. Mov...

Dorsal interosseus muscles . . . . . . . . . . . . . e114 Pain e114 Weakness e115 Thenar muscles . . . . . . . . . . . . . . . . . . . e115 Flexor tendons . . . . . . . . . . . . . . . . . . . . e115 Trigger finger . . . . . . . . . . . . . . . . . . . . e115 Tendon rupture . . . . . . . . . . . . . . . . . . . e116 Mallet finger e116 Ruptured flexor tendon e117 Dupuytren’s contracture . . . . ...

The activity of motor cortical cells and proximal arm muscles during the initiation of planar reaching movements were analyzed to identify whether features of coordinated motor patterns of muscles spanning the elbow and shoulder were evident in the discharge patterns of motor cortical cells. Shoulder and elbow muscles were divided into four groups, flexors and extensors at each joint. Features ...

The reflex EMG responses from a tendon tap or an imposed, medium amplitude (30 degrees), stretch at a range of stretch velocities have been recorded from the triceps and biceps muscles of normal human subjects and in both the affected and "unaffected" arms of hemiparetic patients under relaxed conditions. In the hemiparetic arm, exaggerated tendon jerks were, as expected, observed in both muscl...

A 17‐year‐old male patient who was diagnosed with spastic cerebral palsy in his childhood came for seeking management of spasticity in his right upper limb. We found that he had typical presentations of MM in his right upper limb. Every time, when he was trying to extend his left wrist and fingers, his right wrist and fingers extended simultaneously. However, active motion of the right wrist an...