German physicist Franz Nicolai (1910-1978) developed the first telemetric equipment for transmittinging an ECG and heartbeat. Using this method, the measured values of the athletes could be tracked from kilometers away
The German Sport University Cologne (Deutschen Sporthochschule Köln) expanded its best practices.
Cycle ergospirometry with the registration of the labor/blood pressure ratio and the pulse produced by the earlobe in the Deutschen Sporthochschule Köln. Via a cannula inserted into the brachial artery, blood tests were possible simultaneously.
Exercise research on a ergometer bike with simultaneous recording of ventilation, oxygen uptake, heart rate and diastolic blood pressure. A cannula inserted into the brachial artery allowed for arterial blood samples during the exercise.
American Professor of Biochemistry Henry L. Taylor (1912-1983) of the University of Minnesota, Minneapolis, proposed an index for circulatory test results. This index emphasized that when the strongest muscle is used, the amount of labor is usually limited by cardiac output instead of muscle weakness. Therefore, during walking or running, pulse elevations can be correlated with an increase in cardiac output and thus with the aerobic capacity of the subject.
C. Frank Consalazio (1913-1976), a biochemist at the American Harvard University, wrote in the The American Journal of Clinical Nutrition of December 1971 the contribution 'Energy expenditure studies in military populations using Kofranyi-Michaelis respirometers' on the use of respirometers in field tests of exercise tests.
"This simplified and compact device is quite small, 20 x 27 x 11 cm with a weight of 3 kg, and consists of a dry gas meter to determine the total volume and the temperature of the exhaled air. can be set to continuously absorb 0.3 or 0.6% of each exhaled air in a 500 ml butyl rubber bag.An important feature is that the samples can be removed for a relatively long time.For the final calculation of the energy consumption, these samples with conventional procedures for their CO2 and O2 concentrations."