Abstract
Abstract Forty subjects were given four separate bouts of exercise on a bicycle ergometer, two at 45.45 rpm and two at 54.54 rpm. In each bout, resistance was progressively increased each successive minute by the addition of 1/2 kilogram. Exercise was terminated when the subject's heart rate reached 180 beats/min. Data were in terms of the amount of time required to reach particular levels of heart rate. Each of the test-retests were averaged to give a representative performance for each work load. The intercorrelation between the exercise times to 180 beats/min. for the two work loads was r = .933 after correction for attenuation. Therefore, 87 percent of the individual difference variance in heart rate response was common to the two work loads, while only 13 percent was specific to a particular work load.
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