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Painful and non-painful pressure sensations from muscle are generally accepted to exist but the peripheral neural correlate has not been clarified. The aim of the present human study was to assess the non-painful and painful pressure sensitivity with (1) anaesthetised skin, and (2) anaesthetised skin combined with a block of large diameter muscle afferents.(More)
As a sequel of complete spinal cord injury (SCI), patients often develop chronic pain which is perceived at or just below the level of the lesion. Likewise, in animal models of SCI, spontaneous and evoked pain-related behaviour can be observed. In the present study, the hypothesis was tested that pain related behaviour after SCI in animals is at least(More)
In inflamed tissue--including skeletal muscle--the concentrations of cytokines and neurotrophins are known to increase. However, nothing is known about a possible contribution of these agents to muscle pain and hyperalgesia. The present study investigated acute effects of cytokines and neurotrophins on response properties of slowly conducting muscle(More)
Patients with complete spinal cord injury (SCI) often suffer from chronic pain which is perceived around the segment of the lesion. The present study tests the hypothesis that chronic SCI pain is due to pathophysiological neuronal activity in the spinal segment just rostral to the SCI. In an animal model with complete chronic SCI, the impulse activity of(More)
For cutaneous and articular nociceptors, adenosine triphosphate (ATP) has been shown to be an effective stimulant. The aim of present study was to find out if among muscle afferents ATP-sensitive group IV receptors are present, and if differences in ATP-responsiveness existed between nociceptive and non-nociceptive units. Single fibre activity was recorded(More)
The mechanisms of nociception in the low back are poorly understood, partly because systematic recordings from dorsal horn neurons with input from the low back are largely missing. The purpose of this investigation was to (1) identify spinal segments and dorsal horn neurons receiving input from the low back, (2) test the effect of nerve growth factor (NGF)(More)
Strenuous exercise of muscle as well as inflammation and ischaemia are associated with tissue acidosis. However, so far, nothing is known about the sensitivity to hydrogen ions of slowly conducting muscle afferent units. The study investigated if acid-sensing ion channels, e.g. the polymodal acid/capsaicin-sensitive vanilloid receptors, were present on(More)
In the literature, the pro- or antinociceptive effects of nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) are discussed controversially. Our laboratory and others have reported that in the spinal cord a local lack of NO has an excitatory action on the ongoing (background) activity of dorsal horn neurones. Here, we tested the hypothesis that this(More)
There is increasing evidence that spinal glial cells play an important role in chronic pain states. However, so far no data on the role of microglia in muscle pain are available. The aim of the present study was to investigate the involvement of spinal microglial cells in chronic muscle pain. In a rat model of chronic muscle inflammation (injection of(More)