Veränderung von Herzfrequenz, Lungenfunktion und Körpertemperatur nach Kaltwassertauchgängen mit autonomen Leichttauchgeräten mit Vollmaske und Tauchmaske mit Mundstückgarnitur
BACKGROUND: The use of full-face-masks (FFM) is common in cold-water diving. FFM prevent the diver’s face from cold and enable nasal breathing. The aim of the study was to evaluate the effect of FFM on heat loss, heart rate and lung function. METHODS: 21 divers performed two cold water dives (4 °C, 25 min, 10 m, 1 min ascent and descent) – one with a full-face-mask and the other with a diving mask. Spirometry was performed 45 and 15 min before and 10, 20 and 30 min after each dive. Oral, tympanic and various skin temperature measurements were measured before and after each dive. Diving depth, ambient temperature and heart rate were measured continuously during the dives. Well-being and cold sensation were assessed after the dives. RESULTS: Significant declines of static and dynamic pulmonary function parameters, heart rate and oral, tympanic and skin temperature occurred after FFM and diving mask dives. After FFM dives oral and tympanic temperatures decreased significantly less than after diving mask dives. While well-being and cold-sensation were significantly improved with FFM dives compared to mask dives, no differences were obtained between exposures for heart rate or lung function. DISCUSSION: During cold water dives the use of FFM appears to prevent divers from hypothermia more efficiently than diving masks. Furthermore FFMs reduce the cold sensation and enhance the well-being of the divers. Even though protecting the face from cold water and heat loss, FFM do not reduce cardiac and respiratory effects of cold-water SCUBA dives.
Subject HeadingsHypothermie [GND]