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Objective: To compare the effect of inpatient physiotherapy in a warm versus cold climate in short- and long-term perspectives., Methods: Sixty multiple sclerosis (MS) patients with gait problems, without heat intolerance, were included in a randomized cross-over study of 4-week inpatient physiotherapy in warm (Spain) and cold (Norway) climate. The primary outcome, 6-min walk test (6MWT), and secondary physical performance and self-reported measures were scored at screening, baseline, after treatment and at 3 and 6 months of follow-up. Treatment effects were analysed by mixed models., Results: After treatment, the mean walking distance had increased by 70 m in Spain and 49 m in Norway (P = 0.060). Improvement in favour of warm climate was demonstrated at 6 months of follow-up, 43 m (Spain) compared to 20 m (Norway) (P = 0.048). The patients reported less exertion after walking (6MWT) in favour of treatment in Spain at all time points (P < 0.05). No significant differences in change were detected for the other physical performance measures. Most self-reported measures showed more improvement after treatment in Spain, but these improvements were not sustained at follow-up., Conclusion: The results indicate that MS patients without heat intolerance have additional benefits from physiotherapy in a warm climate., (© 2010 John Wiley & Sons A/S.)