The change in the heart frequencies of two red deer and three roe deer due to various anthropogenic disturbances under controlled conditions were determined by continuous monitoring. The deer were subjected to the following disturbances: people walking, horseback riding, manned kites, tractors, fire, feeding, chain saw noise, dogs barking, and shots. For red deer 118 trials for roe deer 114 trials were analyzed. In order to quantify the heart frequency reactions observed, a model was developed that considered the intensity as well as the duration of these reactions. Practically all disturbances induced a significant change in heart frequency for both species. Optical disturbances generally induced a more intensive reaction than acustic ones. For roe deer reactions varied according to the individual, the time of day, or the season; while for red deer reactions only varying according to the time of day could be observed. In general the roe deer reacted more strongly to disturbances. Both species showed no distinct accustomation to the produced disturbances.