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This pilot study compared the metabolic effects of placebo and 6 mg and 12 mg of oral tizanidine in random double-blind cross-over fashion in five healthy volunteers. The metabolic measurements were made with a portable metabolic chart (Deltatrac, Datex/Instrumentarium, Helsinki, Finland). Heart rate (HR), systolic (BPS), mean (BPM) and diastolic (BPD) blood pressure were measured noninvasively. Subjective assessment of tiredness and dryness of mouth were measured by using visual analogue scales (VAS). There were no statistically significant differences in tiredness or dryness of mouth between the groups. BPD decreased significantly after both doses of tizanidine when compared to placebo (by an average of 12% after 6 mg of tizanidine and 15% after 12 mg of tizanidine from the baseline). Oxygen consumption and energy expenditure decreased significantly after 6 and 12 mg of tizanidine when compared to placebo. The average decrease in oxygen consumption was 3% after 6 mg of tizanidine and 8% after 12 mg of tizanidine, when compared to the baseline. Energy expenditure decreased by an average of 5% after 6 mg of tizanidine and 9% after 12 mg of tizanidine, when compared to the baseline. There were no other statistically significant differences between the groups. This study indicates that 6 and 12 mg of oral tizanidine can be useful for reducing energy expenditure and oxygen consumption without prominent cardiovascular effects.
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