Swedish massage uses five styles of long, flowing strokes to massage. The five basic strokes are effleurage (sliding or gliding), petrissage (kneading), tapotement (rhythmic tapping), friction (cross fiber) and vibration/shaking. Swedish massage has shown to be helpful in reducing pain, joint stiffness, and improving function in patients with osteoarthritis of the knee over a period of eight weeks. The development of Swedish massage is often inaccurately credited to Per Henrik Ling, though the Dutch practitioner Johan Georg Mezger adopted the French names to denote the basic strokes. The term "Swedish" massage is actually only recognized in English and Dutch speaking countries, and in Hungary. Elsewhere (including Sweden) the style is referred to as "classic massage".