Trial of Mannitol Cream for Pain Relief After a Long Run (PainCream)

University of British Columbia

Status and phase: Completed; Phase 1

Conditions: Pain

Treatments: Drug: Mannitol cream; Drug: Placebo Cream

Study type: Interventional

Funder types: Other

Identifiers

NCT01843088

H13-00106

Details and patient eligibility

About

Mannitol cream has been shown clinically to be effective for pain control. To determine if this effect is worth testing on a larger scale, 170 runners will receive a sample of 25% mannitol cream to apply on one leg, and the cream base without the mannitol on the other leg following a 10 km or longer run, and for the following five days. Mannitol and control legs will be chosen at random for each runner. Pain scores before and after cream application will be acquired each day for each leg. Means and standard deviations found will be used to determine the size of a larger study.

Full description

The hypothesis for this study is that Mannitol cream will reduce post long run pain more than vehicle cream alone. In this parallel design, 170 runners who usually experience a pain level greater than 5/10 on a numerical rating scale from 0 to 10 where zero is no pain and 10 is the worst pain ever, will be given a cream containing 25% mannitol to apply on one leg and the vehicle cream to apply on the other leg. The cream assignment will be randomized, and the runner, the person supplying the cream and the person inputting the data will be blinded as to which leg received which cream. Pain levels in each leg following the long run will be recorded, via an e-mail questionnaire, or, failing this, by telephone, the day of the run, and each day, for five days following the run. Mean and standard deviations for pain levels will be calculated for each treatment leg, and a repeated measures ANOVA (Analysis Of VAriance) will be done comparing the pain levels in each leg over the six days. Using this information, if the NRS (Numeric rating scale) pain levels differ by more than 1/10 between the two groups, a larger study will be conducted using the information gathered in this study to determine sample size.

Enrollment: 170 patients

Sex: All

Ages: 19 to 74 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

either:

• never ran 10 km or more, or;
• NRS pain level greater than 5/10 in both legs following a 10 km or more run

Exclusion criteria

• no major skin allergies
• no allergy to mannitol

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Quadruple Blind

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170 participants in 2 patient groups, including a placebo group

Mannitol cream

Experimental group

Description:

cream containing 25% mannitol, applied as often and as much as needed to one leg ( chosen at random), on the day of a 10 km run, following the run and for five days afterwards

Treatment:

Drug: Mannitol cream

Placebo cream

Placebo Comparator group

Description:

Same carrier cream as that containing the active ingredient, mannitol, but without the active ingredient. Placebo cream to be applied to the painful areas of the other leg, chosen at random, on the day of a 10 km or more race, following the race, and as needed for the five days after the race. It is to be noted that, as almost no mannitol is absorbed through the skin, it is highly unlikely that this would involve the pain levels in the placebo leg.

Treatment:

Drug: Placebo Cream