MMW Munch Med Wochenschr. 1975 Mar; 117(11): 443-8.

[Physical investigations into the thermotherapeutic action of the Kneipp hay flower sack]

FroÃƒÂ¶hlich HH, Müller-Limmroth W.

By measuring the capacity for absorption of water and heat output of the hay flower sack (pack) used in Kneipp therapy, it was established that finely chopped hay absorbed less water with less statistical scatter than the flowers and fruit (Flores graminis), but more than cellulose, bandaging materials and Styropor. The hay particles should have a surface of not less than 4mm. According to the behavior of the water absorption, a hay flower sack connot be used more than twice. From the behavior of the heat output, the hay flower sack should be applied directly to the body and covered. In this way the storage period can be extended significantly by 10 minutes to a maximum of 50 minutes. Compared with the hot water bottle, kaolin poultice and mud pack, the hay flower sack emits an intensely moist heat better and for a longer time.