In the course of the four-day march in Nijmegen, 150 participating soldiers consulted a doctor. 128 of these soldiers suffered from tendinitis in the lower extremities. These patients were treated with naproxen 250 mg three times a day for the rest of the march. Of the 106 patients who answered a questionnaire evaluating the treatment, 10.5% had not felt any improvement at all, whereas 89.5% reported improvement or a complete cure from the treatment. Four weeks after the march, 36 persons still reported persistent pain during physical activity. The results indicate that short-term treatment can be beneficial for some but have disadvantages for others.