RESUMO
OBJECTIVE: To examine arterial blood flow in the lower leg during warm-, cold-, and contrast-water therapy. DESIGN: A crossover trial with repeated measurements on the dependent variable. SETTING: Hydrotherapy area of a climate-controlled sports medicine clinic. PARTICIPANTS: A volunteer sample of 24 healthy men. INTERVENTION: Four randomly assigned treatments were performed on each subject on consecutive days. MAIN OUTCOME MEASURE: Arterial blood flow (mL per 100mL/min) from baseline measurements were recorded in a 3-minute to 1-minute on-off ratio for 20 minutes by using strain gauge plethysmography. RESULTS: Contrast therapy produced fluctuations in blood flow throughout the 20-minute treatment. Warm-water therapy (40 degrees C) resulted in significant (P < .001) changes in blood flow compared with the control and contrast conditions. Cold-water therapy (13 degrees C) did not produce significantly decreased blood flow as compared with the control condition. CONCLUSIONS: We suggest that further studies involving contrast therapy to the lower leg in injured populations be carried out to determine whether our initial findings are clinically relevant.