[Incidence and nature of electrocardiographic disorders in the dog after single and multiple exposure to +Gz].

Pathological changes of the ECG were examined in 10 adult dogs exposed to +Gz once a day or 3 times a day for three days a week during 2 to 12 weeks. In response to acceleration all of the dogs developed ECG changes. The frequency and level of these disorders were dependent on the acceleration magnitude and the health state that varied during repeated exposure. These findings were used to develop a 5-score scale for measuring ECG disorders and to identify phase changes in acceleration tolerance during repeated exposure to +Gz. It was also demonstrated that animals can be specifically trained to tolerate sustained and high acceleration +Gz.