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J Appl Physiol (September 3, 2004). doi:10.1152/japplphysiol.01306.2003
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Submitted on December 5, 2003
Accepted on August 30, 2004

Relationship between muscle blood flow and oxygen uptake during exercise in endurance-trained and untrained men

Kari K Kalliokoski1*, Juhani Knuuti2, and Pirjo Nuutila3

1 Turku PET Centre, University of Turku, Turku, Finland; Institute of Sports Medicine Copenhagen, Copenhagen Muscle Research Centre, Bispebjerg Hospital, Copenhagen, Denmark
2 Turku PET Centre, University of Turku, Turku, Finland
3 Turku PET Centre, University of Turku, Turku, Finland; Department of Medicine, University of Turku, Turku, Finland

* To whom correspondence should be addressed. E-mail: kari.kalliokoski{at}tyks.fi.

A recent study showed good correlation between regional blood flow (BF) and oxygen uptake (VO2) 30 minutes after exhaustive exercise. The question that remains open is whether there is similar good correlation between BF and VO2 also during exercise. We reanalysed our previous data from a study in which BF and VO2 was measured in different quadriceps femoris muscles in seven healthy endurance-trained and seven healthy untrained men at rest and during low-intensity intermittent static knee-extension exercise. When the mean values of each muscle were considered there was good correlation between BF and VO2 during exercise in the both groups (r2 0.82 in untrained and 0.97 in trained). However, when calculated individually the correlations were poorer and the mean correlation coefficient (r2) was significantly higher in the trained men (0.71±0.07 vs 0.40±0.11, p=0.03). These results suggest that there is large individual variation in matching blood flow to oxygen uptake in human skeletal muscles during exercise, ranging from very poor to excellent. Furthermore, this matching seems to be better in the endurance-trained than in untrained men.




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