Criteria for maximum oxygen uptake in progressive bicycle tests

Evaluation of true maximal oxygen uptake based on a novel set of standardized criteria

“…The application of currently used primary and secondary criteria in evaluating true max 2 O V  has been criticised (Misquita et al 2001;Niemela et al 1980 Thoden et al (1982), involves a single square wave bout of exercise performed shortly after the incremental phase (Thoden et al 1982). Several recent studies have investigated the utility of the verification phase for establishing true max 2 O V  (Foster et al 2007;Midgley et al 2006;Rossiter et al 2006).…”

Response to Progressive Bicycle Exercise before and following Aortic Valve Replacement

“…Before operation, the average whole body O2 consumption at peak WL appeared to be higher in each subgroup than that which we have seen in healthy subjects undergoing similar exercise [9], whereas the AVR ap peared lo allow 'normalization' o f this ratio within the first 3 postoperative months ( fig. I).…”

“…as well as of abnormally high resting O2 consumption, in the evaluation o f exercise O2 kinetics. It should be noted that the me chanical efficiency (the ratio o f oxygen con sumption to work rate) during progressive bicycle tests appears to be rather constant in healthy subjects [9], Preoperatively, nearly half the patients appeared to demonstrate an inappropriate re sponse in O2 uptake during progressive bicy cle exercise. In fact, in these patients, with rather limited exercise tolerance before sur gery, symptom-limited O2 uptake capacity appeared to be taxed unusually rapidly, sug gesting an unusually steep VCVwork rate curve.…”

“…The fact that in patients with the rapid O2 kinetics during exercise, the peak O2 uptake appeared to exceed even that which had been expected on the basis o f comparable 'steady state' O2 consumption data in healthy sub jects [7,9], may well have been affected by factors such as increased resting O2 con sumption, greater Cb cost o f breathing due to relative hyperventilation [14], and increased myocardial O2 demand during exercise [15]. A poor mechanical efficiency in bicycle rid ing may have been an additional factor, but a learning effect is not likely to have largely influenced the postoperative O2 uptake data.…”

“…The values for each minute represented the mean of 6 con secutive measurements. The reproducibility and the normal values for the used exercise protocol have been previously reported [9], Cardiac Catheterization Before AVR. each patient underwent right and ret rograde left heart catheterization.…”