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SummaryElectrocardiograms obtained during exercise on a treadmill and on a bicycle ergometer have shown that the relation between the QT and RR intervals can be represented by the equation QT = K+ 0.5 RR when K has a value of 70 msec. This equation was the same in trained and untrained subjects. During recovery from exercise the RR intervals lengthened much faster than the QT intervals.The alveolar pCO2 increased during the exercise while QT shortened. Immediately after exercise the alveolar pCO2 continued to increase at a time when the QT was no longer shortening.

SummaryYoung Fischer rats allowed to exercise grow at a faster rate than litter mates confined to small quarters. The bodies of both groups of rats contain the same amount of water. The growth of the parts studied is proportional to body size except for the adrenal glands and the quadriceps-femoris group of muscles. These grow at a greater rate than the body as a whole. The basal metabolism in the rats allowed to exercise is higher than that of the controls.