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Earlier communications from this laboratory have presented the cardiovascular and respiratory responses to graded treadmill exercise in normal men aged 20-29 years (Tabakin et al., 1964), observations during prolonged "steady state" exercise (Levy, Tabakin, and Hanson, 1961), an analysis of the effects of training in a group of dis- tance runners (Tabakin, Hanson, and Levy, 1965), and a comparison of the responses in normal, sedentary men and athletes (Hanson and Tabakin, 1965). Simultaneous bilateral and "tandem" de- terminations (Hanson and Tabakin, 1964) have established the limits of reliability of the dyedilution method employed in these investigations.
Hanson et al. (Fri,) studied this question.
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