Cardiac adaptation at the transition phases of exercise in unanesthetized dogs.

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Abstract
Cardiac adaptation to treadmill exercise was analyzed in terms of patterns, timing, and magnitude of left ventricular outflow variables to trial sequence and intensity of exercise load. Three main patterns occurred at the onset and end of exercise. The fluctuating pattern was most frequent in all variables. An overshoot of heart rate and mean flow were the dominant onset patterns at the first trial. Experience, in a given experiment day, produced a smooth pattern at the transition phases. The data suggest that response time, which was shorter than recovery time in all variables, increased with trial sequence but not with exercise load. Increase in running speed had a nearly linear effect on magnitude of heart rate and mean flow at the plateau level. The dominant factor influencing the pattern and timing at the transition phases was that component related to trial sequence, while change in magnitude at the steady state was related to load intensity.

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