Taken together, the data indicate that thermosensation from a given volume of muscle is less potent than nociception. High-threshold warm-sensitive receptors may mediate the pain following activation by temperatures of 48 ☌ or more. The present data show that high-intensity thermal stimulation of muscle is associated with muscle pain. Temperature measurements within the muscle during the stimulating injections showed that the time course of the pain sensation elicited by saline at 48 ☌ paralleled that of the intramuscular temperature and far outlasted the injection time. Using the the McGill pain questionnaire a subgroup, of subjects qualitatively described the pain using the ‘thermal hot’ and ‘dullness’ word groups. isotonic saline of 48 ☌ induced muscle pain with peak scores of 3.2 ± 0.8 cm on a VAS scale ranging from 0 to 10 cm.
Graven skin skin#
The same subjects recorded strongly increasing scores on a temperature VAS when thermal stimuli in the same intensity range were applied to the skin overlying the muscle by a contact thermode. In 15 subjects, no thermal sensations assessed on a temperature visual analogue scale (VAS) could be detected with intramuscular injections of isotonic saline (1.5 ml) into the anterior tibial muscle at temperatures ranging from 8 to 48 ☌.
The aims of the present study were to determine in humans whether intramuscular injection of warm and cold isotonic saline elicits temperature sensations, muscle pain or any other sensations. The question as to whether these receptors in humans mediate subjective thermal sensations from muscle remains unresolved. Small-calibre afferent units responding to thermal stimuli have previously been reported to exist in muscle.
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