Hugo Wilhelm Knipping

Hugo Wilhelm Knipping (9 July 1895, Dortmund – 25 December 1984, Bonn) was a German physician, internist, and university teacher who founded clinical spiroergometry, the measurement of gas exchange during graded exercise, and is called the "Vater der Spiroergometrie" (father of spiroergometry)¹. Working at the Eppendorf hospital in Hamburg, he combined a gas-metabolism apparatus with a crank ergometer in 1929 and designated the method spiroergometry, the beginning of precise clinical exercise diagnostics². From 1939 to 1963 he headed the Medizinische Klinik Lindenburg of the University of Cologne³.

Life and career

Knipping trained and first worked in Hamburg. His 1929 founding paper lists his affiliation as Eppendorf, the Hamburg hospital district⁴, and a history of German exercise physiology describes him as physician and internist at Hamburg University, where he built a gas-metabolism apparatus for examining humans at rest in 1924 and a dynamo-cranked ergometer in 1928². A study visit to the Rockefeller Institute from 1926 to 1928 falls within these Hamburg years³.

His career then moved through Düsseldorf to Cologne. From 1934 he also directed the Fliegeruntersuchungsstelle (aviator examination station) of the Medizinische Akademie Düsseldorf³. In October 1939 he became Professor and Head of the Medizinische Klinik at the University of Cologne, holding the post until 1963³; the DFG research archive records his places of activity as the Medizinische Akademie Düsseldorf and the Universität zu Köln, Medizinische Klinik Lindenburg in Köln-Lindenthal¹.

Scientific work: the Knipping exercise test

The method Knipping named spiroergometry measures the body's gas exchange while the subject works on a bicycle ergometer. In 1929 he combined an enlarged gas-metabolism apparatus for exercise examinations with his crank ergometer, creating what a history of the field calls the genesis of precise and simple clinical exercise diagnostics².

The protocol. In a single Knipping-style examination, oxygen consumption, carbon dioxide output, minute ventilation, ventilatory equivalent, heart rate, and blood pressure were registered continuously from rest to very severe exercise, and a steady state was reached at each stage of rest or exercise before measurements were made⁸. The steady-state requirement is the physiological core of the method: at each watt level the circulation and respiration are allowed to stabilize, so the measured gas values reflect a defined workload rather than a transient adjustment. Knipping described spirographic functional analysis in a watt-step test carried up to the Vita maxima, the limit of performance, as a central quantitative measure of cardiac performance capacity (Herzleistungsbreite)⁷.

Diagnostic patterns. The test distinguished groups by their regulatory economy. First-class athletes showed an especially economic regulation of circulation and respiration, best demonstrated by the oxygen equivalent, with characteristic deviations from normal at high exercise levels⁸. Conversely, patients with diseases of both the respiratory and circulatory systems showed a low oxygen equivalent combined with a high respiratory equivalent⁸. In his 1951 lecture he reported functional analyses of work insufficiencies of the left and right heart, complementing about 600 intracardial pressure measurements carried out with colleagues including Bolt, Rink, Stanischeff, Zorn, and Wullen⁷.

By the numbers

The exercise tests produced normative reference values. Average values were given for heart rate and blood pressure changes at different exercise levels measured in watts, and values for carbon dioxide output and the respiratory quotient at different watt levels were given for the first time in a larger study population⁸.

Key publications and continuing citation

Two papers anchor the method. "Die Untersuchung der Ökonomie von Muskelarbeit bei Gesunden und Kranken" appeared on 1 January 1929 in the Zeitschrift für die gesamte experimentelle Medizin (66(1):517–534, doi:10.1007/bf02621977) and is regarded as the founding publication of spiroergometry as a clinical method⁴. "Über die Funktionsprüfung von Atmung und Kreislauf" appeared on 1 October 1936 in Beiträge zur Klinik der Tuberkulose (88(6):503–518, doi:10.1007/bf02141957), under the affiliation Med. Poliklinik der Akademie and II. Med. Abt. d. städt. Krankenanstalten Düsseldorf⁵.

The 1936 paper is still in use. A February 2024 review in Zeitschrift für Pneumologie (Volume 21, pages 127–138) presents spiroergometry as an established instrument for evaluating the (patho)physiological components of metabolism, circulation, and ventilation during exercise, and cites Knipping's 1936 paper as its reference 4⁶. His book Untersuchung und Beurteilung des Herzkranken covered practical routine examination, preoperative cardiac diagnostics, functional analysis for heart prophylaxis and sport therapy, and cor pulmonale⁹.

Career under National Socialism

Documented intersections with Nazi-era institutions exist. From 1934 he directed the Fliegeruntersuchungsstelle in Düsseldorf, an aviation-medicine examination station, and in 1936 published "Über die Funktionsprüfung von Atmung und Kreislauf bei der Fliegereignungsuntersuchung" in Luftfahrtmedizin 1(1):26–38, applying his functional testing to the assessment of fitness for flying³. During the war the German Research Foundation (DFG) approved two of his projects: in 1941, "Untersuchung von Funktionsproblemen beim gesunden und kranken Organismus unter leichter und schwerer körperlicher Arbeit", and in 1943, "Untersuchungen über die O2 Utilisation bei gesunder und bei gestörter Kreislaufregulation"¹.

References

1. Knipping, Hugo Wilhelm, GEPRIS Historisch (Deutsche Forschungsgemeinschaft)
2. Early German roots of exercise physiology, Human Kinetics
3. Gaeromed Db – Entry for Hugo Wilhelm Knipping
4. Die Untersuchung der Ökonomie von Muskelarbeit bei Gesunden und Kranken (1929), publication index
5. Über die Funktionsprüfung von Atmung und Kreislauf (1936), publication index
6. Ventilation unter Belastung – Praktisches zur Analyse in der Spiroergometrie, Zeitschrift für Pneumologie 21:127–138 (2024)
7. Funktionsprobleme in der Herz- und Lungenklinik, Deutsche Medizinische Wochenschrift (1951)
8. DMW abstract: spiroergometric registration from rest to severe exercise
9. Hugo Wilhelm Knipping, Deutsche Digitale Bibliothek

Topic: Encyclopedia › Life and health › Life and health scientists › Medical and health researchers › Pulmonary and respiratory researchers

Initially written Oct 10, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Oct 25, 2026

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