Journal of Applied Physiology AJP: Heart and Circulatory Physiology
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J Appl Physiol (July 12, 2002). doi:10.1152/japplphysiol.00259.2002
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Articles in PresS, published online ahead of print July 12, 2002
J Appl Physiol, 10.1152/jap.00259.2002
Submitted on March 27, 2002
Accepted on July 8, 2002

BLOOD FLOW AND OXYGEN UPTAKE INCREASE WITH TOTAL POWER DURING FIVE DIFFERENT KNEE-EXTENSION CONTRACTION RATES

Gisela Sjogaard1*, Ernst A Hansen2, and Takuya Osada3

1 Department of Physiology, National Institute of Occupational Health, Copenhagen, Denmark
2 Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
3 Department of Preventive Medicine and Public Health, Tokyo Medical University, Tokyo, Japan; Copenhagen Muscle Research Center, Copenhagen, Denmark

* To whom correspondence should be addressed. E-mail: gs{at}ami.dk.

Controversies exist regarding quantification of internal power (IP) generated by the muscles to overcome energy changes of moving body segments when external power (EP) is performed. The aim was to 1) use a kinematic model for estimation of IP during knee-extension, 2) validate the model by independent calculation of IPmet from metabolic variables, and 3) analyse the relationship between total power (TP= EP +IP) and physiological responses. IP increased curvilinear: 5, 7, 13, 21, and 34 W with contraction rate: 45, 60, 75, 90, and 105 cpm, but was independent of EP. Correspondingly, IPmet was 5, 7, 10, 19, and 28 W supporting the kinematic model. HR, VO2, and leg blood flow plotted versus TP fell on the same line independent of contraction rate; and muscular mechanical efficiency as well as delta efficiency remained remarkably constant across contraction rates. It is concluded that the novel metabolic validation of the kinematic model supports the model assumptions; and physiological responses proved to be closely related to TP supporting the legitimacy of IP estimates.




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